text:
The Adventures of Mary-Kate & Ashley
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The Adventures of
Mary-Kate & Ashley
The VHS cover for The Case of Thorn Mansion.
Genre
mystery, musical, children's
Created by
Michael Kruzan
Starring
Mary-Kate Olsen
Ashley Olsen
Country of origin
United States
No. of episodes
11
Production
Running time
approx. 30 minutes (per episode)
Production company(s)
Dualstar Video
Distributor
KidVision
Release
Original release
1994 (1994) – 1997 (1997)
The Adventures of Mary-Kate & Ashley is a series of musical mystery videos starring twin actresses Mary-Kate and Ashley Olsen. The series was also written as children's books, showing the twins on the cover. The video series was distributed by KidVision.
Contents
[hide]
1 Format
2 Plot outlines
3 Compilation releases
4 References
Format[edit]
Each video begins with the girls singing the theme song. Following the theme song, the girls receive a phone call, informing them of some urgent mystery that needs to be solved. Their motto is "Will solve any crime by dinnertime." Each video features the girls singing multiple songs about the mystery they are working on. They never fail to solve the mystery with their sidekick, Clue (a Basset Hound), and, indeed, the solution is usually something either very obvious or very trivial, to give the video a humorous ending. A set of books was written as a companion piece to the show.[1]
Plot outlines[edit]
Each episode is named "The Adventures of Mary-Kate & Ashley" followed by the name of the mystery.
1. The Case of Thorn Mansion (1994)
A ghost is supposedly haunting a mansion in Transylvania, and the girls must figure out who or what is actually behind it. The "ghost" ends up being the caretaker of the mansion who is also a beekeeper.
2. The Case of the Logical I Ranch (1994)
Pungent smells and weird noises plague the "Logical I Ranch". Some employees of the ranch think it is being caused by a dragon running loose.
3. The Case of the SeaWorld Adventure (1995)
The girls' parents work at SeaWorld as over-worked dolphin trainers. One day, the girls run into a dead body in the woods that eventually leads them and their parents to a cruise ship while trying to solve the rigged mystery. The boss of the girls' parents had planted evidence to get them all on the cruise, so they could take a much-needed family vacation.
4. The Case of the Mystery Cruise (1995)
The sequel to The Case of the SeaWorld Adventure. The girls' father's laptop containing vital information gets stolen while on a cruise ship, and must be retrieved. They believe a friend of their father's was responsible, but it later turned out to be a staged occurrence.
5. The Case of the Fun House Mystery (1995)
Something is making scary noises inside the fun house at an amusement park, and the girls must figure out who or what it is. Using the clue of "Monster Mush" and "bananas", they find out the monster lurking inside the fun house is really an orangutan.
6. The Case of the Christmas Caper (1995)
Hackers break into Santa's computer to steal the "Spirit of Christmas", the plane Santa uses to fly to deliver all the presents to the children of the world on Christmas Eve. It is up to girls to show what the holiday is all about.
7. The Case of the U.S. Space Camp Mission (1996)
A space shuttle has been grounded, due to a mysterious tapping sound coming from its outer surface. Unless the girls can figure out what is going on, the space shuttle will be not be able to lift-off. To figure out the mystery, they get help learning about space travel through the U.S. Space Camp program.
8. The Case of the Shark Encounter (1996)
Three pirates claim that the sharks in a tank are singing, and the girls must figure out where the strange sounds are coming from.
9. The Case of the Hotel Who-Done-It (1996)
The girls travel to Hawaii, where they meet a hotel manager who has been dealing with a string of recent disappearances around the hotel.
10. The Case of the Volcano Mystery (1997)
The girls receive a call from some miners of marshmallows that a snowball-throwing monster has been "terrorizing" them. The girls eventually find out that the "snow" is really ash, and the "monster" is actually a geologist warning them that an active volcano is not a safe place to work.
11. The Case of the United States Navy Adventure (1997)
Unidentified flying objects have been seen flying overhead. In this case, the girls get help from the United States Navy to solve the mystery. The "UFOs" ended up being a satellite that was flying too low in orbit.
Compilation releases[edit]
Other than the eleven episodes, there were two compilation videos made.
The Amazing Adventures of Mary-Kate & Ashley
Includes The Case of the SeaWorld Adventure, The Case of the U.S. Space Camp Mission, and The Case of the Hotel Who-Done-It.
The Favorite Adventures of Mary-Kate and Ashley
Includes The Case of the Volcano Mystery, The Case of the Fun House Mystery, and The Case of the Logical i Ranch.
References[edit]
Jump up ^ Messer, Lesley (October 18, 2013). "Mary-Kate and Ashley Olsen Dish About Expensive 'Full House' Wardrobe". ABC News. Disney-ABC Television Group. Archived from the original on October 18, 2013. Retrieved October 21, 2013.
Retrieved from "https://en.wikipedia.org/w/index.php?title=The_Adventures_of_Mary-Kate_%26_Ashley&oldid=831758275"
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Direct-to-video film series
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Jambalaya (On the Bayou)
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"Jambalaya (On the Bayou)"
Single by Hank Williams
B-side
"Window Shopping"
Released
July 19, 1952
Format
7"
Recorded
June 13, 1952
Studio
Castle Studio, Tulane Hotel, Nashville, Tennessee
Genre
Country, pop
Length
2:52
Label
MGM
K-11283 (U.S. 7")
Songwriter(s)
Hank Williams, Moon Mullican
Hank Williams singles chronology
"Half as Much"
(1952) "Jambalaya (On the Bayou)"
(1952) "Settin' the Woods on Fire"
(1952)
"Half as Much"
(1952) "Jambalaya (On the Bayou)"
(1952) "Settin' the Woods on Fire"
(1952)
Audio sample
file
help
"Jambalaya (On the Bayou)" is a song written and recorded by American country music singer Hank Williams that was first released in July 1952. Named for a Creole and Cajun dish, jambalaya, it spawned numerous cover versions and has since achieved popularity in several different music genres.
Contents
[hide]
1 Composition
2 Recording and release
3 Chart performance
4 Cover versions
5 References
6 External links
Composition[edit]
With a melody based on the Cajun song "Grand Texas", some sources, including Allmusic, claim that the song was co-written by Williams and Moon Mullican, with Williams credited as sole author and Mullican receiving ongoing royalties. Williams' biographer Colin Escott speculates that it is likely Mullican wrote at least some of the song and Hank's music publisher Fred Rose paid him surreptitiously so that he wouldn't have to split the publishing with Moon's label King Records.[1] Williams' song resembles "Grand Texas" in melody only. "Grand Texas" is a song about a lost love, a woman who left the singer to go with another man to "Big Texas"; "Jambalaya", while maintaining a Cajun theme, is about life, parties and stereotypical food of Cajun cuisine. The narrator leaves to pole a pirogue down the shallow water of the bayou, to attend a party with his girlfriend Yvonne and her family. At the feast they have Cajun cuisine, notably Jambalaya, crawfish pie and filé gumbo, and drink liquor from fruit jars. Yvonne is his "ma cher amio", which is Cajun French for "my good friend" or more likely to mean "my girlfriend." Technically in Cajun culture "ma cher amio" means my dear, which refers to Yvonne in this song.
Recording and release[edit]
Williams recorded the song on June 13, 1952, his first recording session in six months, at Castle Studio in Nashville with backing provided by Jerry Rivers (fiddle), Don Helms (steel guitar), Chet Atkins (lead guitar), Chuck Wright (bass) and probably Ernie Newton (bass).[2] Interestingly, the recording Williams made differs significantly from Mullican's. Since the original melody of the song was from "Grand Texas", the song is a staple of Cajun culture. However, although Williams kept a Louisiana theme, the song is not a true cajun song, and it is precisely because of this that song gained such widespread popularity:
"Ethnic music is usually unpalatable for a mass market unless it is diluted in some way (Harry Belafonte's calypsos, Paul Simon's Graceland...the list is endless). The broader audience related to 'Jambalaya' in a way that it could never relate to a true cajun two-step led by an asthmatic accordian and sung in patois."[1]
The song is set in the key of G major, moving between a bass of C, G, and E.
Released in July 1952, it reached number one on the U.S. country charts for fourteen non-consecutive weeks.[3] Williams performed 'Jambalaya' at the Louisiana Hayride as part of his "homecoming" in fall, 1952 (after being fired from the Grand Ole Opry). A live recording released as part of a series of Hayride performances includes outbursts of applause. [4]
After Williams released his version, Cajuns recorded the song again using Cajun instruments. However, they used Williams' lyrics translated into the Cajun French language. "Jambalaya" remains one of Hank Williams' most popular songs today. International, translated or derived versions do exist at least in Chinese, Dutch, Finnish, French, Italian, Polish German, Spanish and Estonian.
A demo version of Williams singing "Jambalaya (On the Bayou)" with just his guitar, likely recorded in 1951,[5] is also available. Williams composed a sequel to the song from the female perspective, "I'm Yvonne (Of the Bayou)", with Jimmy Rule, recorded by Goldie Hill. It was not as popular. As with "Jambalaya" there is speculation that Williams may have purchased this song from Mullican.
Chart performance[edit]
Chart (1952)
Peak
position
US Billboard Hot Country Singles 1
US Billboard Most Played By Jukeboxes 20
Cover versions[edit]
"Jambalaya"
Sheet music of "Jambalaya" with Jo Stafford
Single by Jo Stafford
Released
1952 (1952)
Genre
Traditional pop
Songwriter(s)
Hank Williams
Jo Stafford singles chronology
"You Belong to Me"
(1952) "Jambalaya"
(1952) "Early Autumn"
(1952)
"You Belong to Me"
(1952) "Jambalaya"
(1952) "Early Autumn"
(1952)
A version of the song was recorded by Jo Stafford in 1952, reaching #3 on the Billboard pop charts (and making the song well known to people other than country music fans). Mitch Miller had originally intended "Jambalaya" to be recorded by Jimmy Boyd for Columbia Records. Boyd turned the song down and Miller recorded it with Jo Stafford.
Homer and Jethro recorded it for RCA Victor in 1952.
A recording by The Tanner Sisters with an orchestra and conductor Don Carlos was made in London on September 25, 1952. It was released by EMI on the His Master's Voice label as catalog number B 10418.
Kitty Wells recorded it for Decca in 1960.
Jimmy Boyd recorded it for Dot Records.
Drifting Cowboy steel guitarist Don Helms released his own instrumental version in 1962.
Ex-Hong Kong female singer, CHANG Loo (張露), covered this song twice. The first version was covered in Mandarin Chinese entirely, under title name of 小癩痲 in the mid-1950s. The second one was covered, in alternate English and Mandarin Chinese, under the name of Jambalaya/小癩痲 on her album An Evening with Chang Loo in 1963.
The song was Brenda Lee's first single in 1956.
Moon Mullican, who likely wrote the song with Williams but could not be credited because he was under contract to King Records, recorded his own version.
George Jones recorded the song for his 1960 LP George Jones Salutes Hank Williams.
Fats Domino scored a hit with the song in 1961.
Elvis Presley also cut the song for RCA Victor.
Gerry and the Pacemakers released a version in 1964.
Hank's hero Roy Acuff included it on his 1966 LP Sings Hank Williams for the First Time.
Conway Twitty released it on his 1967 LP Here's Conway Twitty.
Buddy Williams Australian Country Music singer covered it on his 1968 LP "Buddy sings Hank"
In India, Usha Iyer (now Usha Uthup) recorded a version in 1968 on the HMV label, that became the best selling song until then, by an Indian artist in English.
Jerry Lee Lewis recorded it at Sun Records and again for his 1969 album Sings the Country Music Hall of Fame Hits, Vol. 1.
Hoyt Axton cut it for Capitol in 1971.
The Nitty Gritty Dirt Band's version peaked at #84 in 1972.
Shocking Blue recorded the song in 1972 for their album Inkpot.
"Jambalaya"
Single by John Fogerty
from the album The Blue Ridge Rangers
Released
1973 (1973)
Genre
Country
Songwriter(s)
Hank Williams
John Fogerty singles chronology
"Blue Ridge Mountain Blues"
(1972) "Jambalaya"
(1973) "Hearts of Stone"
(1973)
"Blue Ridge Mountain Blues"
(1972) "Jambalaya"
(1973) "Hearts of Stone"
(1973)
John Fogerty hit #16 in 1973 under the name of The Blue Ridge Rangers.
The Carpenters featured the song, in an uptempo MOR version with country flourishes, on their 1973 album Now & Then. Their version was released as a single outside the United States in 1974 and sold well in the UK (peaking at number 12 in the charts)[6] and Japan.
In 1974, Singapore-based female singer, Ervinna, covered this song, on her LP album Top Hits Vol. 2 with the local White Cloud Records.
The Meters recorded the song on their 1975 LP Fire on the Bayou.
Emmylou Harris included it in her 1975 album Elite Hotel
Teresa Teng performed the song live in Japan in 1976.
In 1978, Hong Kong female singer, Paula Tsui (徐小鳳), covered the Mandarin Chinese version made by CHANG Loo, on her LP album 風雨同路.
Lucinda Williams included the composition on her 1979 debut Ramblin'.
Andy Kaufman performed the song on Late Night with David Letterman in 1983.
Moe Bandy recorded the song for his 1983 tribute Sings the Songs of Hank Williams.
The Residents covered the song for their 1986 album Stars & Hank Forever.
Hank's daughter Jett Williams recorded the song in 1996.
Van Morrison and Linda Gail Lewis on their 2000 album You Win Again
In 2005, two versions of "Jambalaya" surged in Mexican folk music, one by Banda Limón and the other from the Duranguense group K-Paz de la Sierra. However, in Mexican music, the most famous cover version is by Los Felinos.
For his 2007 album Oh, My NOLA, Harry Connick, Jr. recorded the song in a big band arrangement. "Jambalaya" was one of many well-known songs on the album associated with New Orleans and Louisiana.
Jeff Healey on his 2008 album Mess of Blues
Lacy J. Dalton released it on her 2010 LP Here's to Hank.
Country star Hunter Hayes made his debut, at the age of four years, covering the song on the accordion with Hank Williams, Jr.[7]
Garth Brooks recorded the song for the 2013 Country Classics album in the Blame It All on My Roots: Five Decades of Influences compilation.
References[edit]
^ Jump up to: a b Escott, Colin & 2004 214.
Jump up ^ Escott, Colin & 2004 347.
Jump up ^ Whitburn, Joel (2004). The Billboard Book Of Top 40 Country Hits: 1944–2006, Second edition. Record Research. p. 387.
Jump up ^ Tracy E. Laird, "Louisiana Hayride: Radio & Roots Music Along the Red River," Oxford University Press, pp. 96-97
Jump up ^ Escott, Colin & 2004 328.
Jump up ^ Carpenters UK chart history, The Official Charts Company. Retrieved March 20, 2012.
Jump up ^ "Hunter Hayes Bio | Hunter Hayes Career". CMT. Retrieved July 31, 2014.
External links[edit]
Excerpt of Brenda Lee singing "Jambalaya", April 9, 1960 on Ozark Jubilee
Preceded by
"It Wasn't God Who Made Honky Tonk Angels" by Kitty Wells[1] Best Selling Retail Folk (Country & Western) Records
number one single by Hank Williams and His Drifting Cowboys
September 6, 1952[1]
December 18, 1952[1] Succeeded by
"It Wasn't God Who Made Honky Tonk Angels" by Kitty Wells[1]
"Back Street Affair" by Webb Pierce[1]
[show]
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[show]
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[show]
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Singles
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"Hearts of Stone"
"Rockin' All Over the World"
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[show]
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Nucleosynthesis
From Wikipedia, the free encyclopedia
Jump to: navigation, search
"Nucleogenesis" redirects here. For the song by Vangelis, see Albedo 0.39.
Nucleosynthesis is the process that creates new atomic nuclei from pre-existing nucleons, primarily protons and neutrons. The first nuclei were formed about three minutes after the Big Bang, through the process called Big Bang nucleosynthesis. It was then that hydrogen, helium and lithium formed to become the content of the first stars, and this primeval process is responsible for the present hydrogen/helium ratio of the cosmos.
With the formation of stars, heavier nuclei were created from hydrogen and helium by stellar nucleosynthesis, a process that continues today. Some of these elements, particularly those lighter than iron, continue to be delivered to the interstellar medium when low mass stars eject their outer envelope before they collapse to form white dwarfs. The remains of their ejected mass form the planetary nebulae observable throughout our galaxy.
Supernova nucleosynthesis within exploding stars by fusing carbon and oxygen is responsible for the abundances of elements between magnesium (atomic number 12) and nickel (atomic number 28).[1] Supernova nucleosynthesis is also thought to be responsible for the creation of rarer elements heavier than iron and nickel, in the last few seconds of a type II supernova event. The synthesis of these heavier elements absorbs energy (endothermic) as they are created, from the energy produced during the supernova explosion. Some of those elements are created from the absorption of multiple neutrons (the R process) in the period of a few seconds during the explosion. The elements formed in supernovas include the heaviest elements known, such as the long-lived elements uranium and thorium.
Cosmic ray spallation, caused when cosmic rays impact the interstellar medium and fragment larger atomic species, is a significant source of the lighter nuclei, particularly 3He, 9Be and 10,11B, that are not created by stellar nucleosynthesis.
In addition to the fusion processes responsible for the growing abundances of elements in the universe, a few minor natural processes continue to produce very small numbers of new nuclides on Earth. These nuclides contribute little to their abundances, but may account for the presence of specific new nuclei. These nuclides are produced via radiogenesis (decay) of long-lived, heavy, primordial radionuclides such as uranium and thorium. Cosmic ray bombardment of elements on Earth also contribute to the presence of rare, short-lived atomic species called cosmogenic nuclides.
Contents
[hide]
1 Timeline
2 History of nucleosynthesis theory
3 Processes
4 The major types of nucleosynthesis
4.1 Big Bang nucleosynthesis
4.2 Stellar nucleosynthesis
4.3 Explosive nucleosynthesis
4.4 Neutron star collision
4.5 Cosmic ray spallation
5 Empirical evidence
6 Minor mechanisms and processes
7 See also
8 References
9 Further reading
10 External links
Timeline[edit]
Periodic table showing the cosmogenic origin of each element. Elements from carbon up to sulfur may be made in small stars by the alpha process. Elements beyond iron are made in large stars with slow neutron capture (s-process), followed by expulsion to space in gas ejections (see planetary nebulae). Elements heavier than iron may be made in neutron star mergers or supernovae after the r-process, involving a dense burst of neutrons and rapid capture by the element.
It is thought that the primordial nucleons themselves were formed from the quark–gluon plasma during the Big Bang as it cooled below two trillion degrees. A few minutes afterward, starting with only protons and neutrons, nuclei up to lithium and beryllium (both with mass number 7) were formed, but the abundances of other elements dropped sharply with growing atomic mass. Some boron may have been formed at this time, but the process stopped before significant carbon could be formed, as this element requires a far higher product of helium density and time than were present in the short nucleosynthesis period of the Big Bang. That fusion process essentially shut down at about 20 minutes, due to drops in temperature and density as the universe continued to expand. This first process, Big Bang nucleosynthesis, was the first type of nucleogenesis to occur in the universe.
The subsequent nucleosynthesis of the heavier elements requires the extreme temperatures and pressures found within stars and supernovas. These processes began as hydrogen and helium from the Big Bang collapsed into the first stars at 500 million years. Star formation has occurred continuously in galaxies since that time. Among the elements found naturally on Earth (the so-called primordial elements), those heavier than boron were created by stellar nucleosynthesis and by supernova nucleosynthesis. They range in atomic numbers from Z=6 (carbon) to Z=94 (plutonium). Synthesis of these elements occurred either by nuclear fusion (including both rapid and slow multiple neutron capture) or to a lesser degree by nuclear fission followed by beta decay.
A star gains heavier elements by combining its lighter nuclei, hydrogen, deuterium, beryllium, lithium, and boron, which were found in the initial composition of the interstellar medium and hence the star. Interstellar gas therefore contains declining abundances of these light elements, which are present only by virtue of their nucleosynthesis during the Big Bang. Larger quantities of these lighter elements in the present universe are therefore thought to have been restored through billions of years of cosmic ray (mostly high-energy proton) mediated breakup of heavier elements in interstellar gas and dust. The fragments of these cosmic-ray collisions include the light elements Li, Be and B.
History of nucleosynthesis theory[edit]
The first ideas on nucleosynthesis were simply that the chemical elements were created at the beginning of the universe, but no rational physical scenario for this could be identified. Gradually it became clear that hydrogen and helium are much more abundant than any of the other elements. All the rest constitute less than 2% of the mass of the Solar System, and of other star systems as well. At the same time it was clear that oxygen and carbon were the next two most common elements, and also that there was a general trend toward high abundance of the light elements, especially those composed of whole numbers of helium-4 nuclei.
Arthur Stanley Eddington first suggested in 1920, that stars obtain their energy by fusing hydrogen into helium and raised the possibility that the heavier elements may also form in stars.[2][3] This idea was not generally accepted, as the nuclear mechanism was not understood. In the years immediately before World War II, Hans Bethe first elucidated those nuclear mechanisms by which hydrogen is fused into helium.
Fred Hoyle's original work on nucleosynthesis of heavier elements in stars, occurred just after World War II.[4] His work explained the production of all heavier elements, starting from hydrogen. Hoyle proposed that hydrogen is continuously created in the universe from vacuum and energy, without need for universal beginning.
Hoyle's work explained how the abundances of the elements increased with time as the galaxy aged. Subsequently, Hoyle's picture was expanded during the 1960s by contributions from William A. Fowler, Alastair G. W. Cameron, and Donald D. Clayton, followed by many others. The seminal 1957 review paper by E. M. Burbidge, G. R. Burbidge, Fowler and Hoyle[5] is a well-known summary of the state of the field in 1957. That paper defined new processes for the transformation of one heavy nucleus into others within stars, processes that could be documented by astronomers.
The Big Bang itself had been proposed in 1931, long before this period, by Georges Lemaître, a Belgian physicist, who suggested that the evident expansion of the Universe in time required that the Universe, if contracted backwards in time, would continue to do so until it could contract no further. This would bring all the mass of the Universe to a single point, a "primeval atom", to a state before which time and space did not exist. Hoyle later gave Lemaître's model the derisive term of Big Bang, not realizing that Lemaître's model was needed to explain the existence of deuterium and nuclides between helium and carbon, as well as the fundamentally high amount of helium present, not only in stars but also in interstellar space. As it happened, both Lemaître and Hoyle's models of nucleosynthesis would be needed to explain the elemental abundances in the universe.
The goal of the theory of nucleosynthesis is to explain the vastly differing abundances of the chemical elements and their several isotopes from the perspective of natural processes. The primary stimulus to the development of this theory was the shape of a plot of the abundances versus the atomic number of the elements. Those abundances, when plotted on a graph as a function of atomic number, have a jagged sawtooth structure that varies by factors up to ten million. A very influential stimulus to nucleosynthesis research was an abundance table created by Hans Suess and Harold Urey that was based on the unfractionated abundances of the non-volatile elements found within unevolved meteorites.[6] Such a graph of the abundances is displayed on a logarithmic scale below, where the dramatically jagged structure is visually suppressed by the many powers of ten spanned in the vertical scale of this graph. See Handbook of Isotopes in the Cosmos for more data and discussion of abundances of the isotopes.[7]
Abundances of the chemical elements in the Solar System. Hydrogen and helium are most common, residuals within the paradigm of the Big Bang.[8] The next three elements (Li, Be, B) are rare because they are poorly synthesized in the Big Bang and also in stars. The two general trends in the remaining stellar-produced elements are: (1) an alternation of abundance of elements according to whether they have even or odd atomic numbers, and (2) a general decrease in abundance, as elements become heavier. Within this trend is a peak at abundances of iron and nickel, which is especially visible on a logarithmic graph spanning fewer powers of ten, say between logA=2 (A=100) and logA=6 (A=1,000,000).
Processes[edit]
There are a number of astrophysical processes which are believed to be responsible for nucleosynthesis. The majority of these occur in shells within stars, and the chain of those nuclear fusion processes are known as hydrogen burning (via the proton-proton chain or the CNO cycle), helium burning, carbon burning, neon burning, oxygen burning and silicon burning. These processes are able to create elements up to and including iron and nickel. This is the region of nucleosynthesis within which the isotopes with the highest binding energy per nucleon are created. Heavier elements can be assembled within stars by a neutron capture process known as the s-process or in explosive environments, such as supernovae, by a number of other processes. Some of those others include the r-process, which involves rapid neutron captures, the rp-process, and the p-process (sometimes known as the gamma process), which results in the photodisintegration of existing nuclei.
The major types of nucleosynthesis[edit]
Big Bang nucleosynthesis[edit]
Main article: Big Bang nucleosynthesis
Big Bang nucleosynthesis occurred within the first three minutes of the beginning of the universe and is responsible for much of the abundance of 1H (protium), 2H (D, deuterium), 3He (helium-3), and 4He (helium-4). Although 4He continues to be produced by stellar fusion and alpha decays and trace amounts of 1H continue to be produced by spallation and certain types of radioactive decay, most of the mass of the isotopes in the universe are thought to have been produced in the Big Bang. The nuclei of these elements, along with some 7Li and 7Be are considered to have been formed between 100 and 300 seconds after the Big Bang when the primordial quark–gluon plasma froze out to form protons and neutrons. Because of the very short period in which nucleosynthesis occurred before it was stopped by expansion and cooling (about 20 minutes), no elements heavier than beryllium (or possibly boron) could be formed. Elements formed during this time were in the plasma state, and did not cool to the state of neutral atoms until much later.[citation needed]
Chief nuclear reactions responsible for the relative abundances of light atomic nuclei observed throughout the universe.
Stellar nucleosynthesis[edit]
Main articles: Stellar nucleosynthesis, Proton-proton chain, Triple-alpha process, CNO cycle, s-process, p-process, and photodisintegration
Stellar nucleosynthesis is the nuclear process by which new nuclei are produced. It occurs in stars during stellar evolution. It is responsible for the galactic abundances of elements from carbon to iron. Stars are thermonuclear furnaces in which H and He are fused into heavier nuclei by increasingly high temperatures as the composition of the core evolves.[9] Of particular importance is carbon, because its formation from He is a bottleneck in the entire process. Carbon is produced by the triple-alpha process in all stars. Carbon is also the main element that causes the release of free neutrons within stars, giving rise to the s-process, in which the slow absorption of neutrons converts iron into elements heavier than iron and nickel.[10]
The products of stellar nucleosynthesis are generally dispersed into the interstellar gas through mass loss episodes and the stellar winds of low mass stars. The mass loss events can be witnessed today in the planetary nebulae phase of low-mass star evolution, and the explosive ending of stars, called supernovae, of those with more than eight times the mass of the Sun.
The first direct proof that nucleosynthesis occurs in stars was the astronomical observation that interstellar gas has become enriched with heavy elements as time passed. As a result, stars that were born from it late in the galaxy, formed with much higher initial heavy element abundances than those that had formed earlier. The detection of technetium in the atmosphere of a red giant star in 1952,[11] by spectroscopy, provided the first evidence of nuclear activity within stars. Because technetium is radioactive, with a half-life much less than the age of the star, its abundance must reflect its recent creation within that star. Equally convincing evidence of the stellar origin of heavy elements, is the large overabundances of specific stable elements found in stellar atmospheres of asymptotic giant branch stars. Observation of barium abundances some 20-50 times greater than found in unevolved stars is evidence of the operation of the s-process within such stars. Many modern proofs of stellar nucleosynthesis are provided by the isotopic compositions of stardust, solid grains that have condensed from the gases of individual stars and which have been extracted from meteorites. Stardust is one component of cosmic dust, and is frequently called presolar grains. The measured isotopic compositions in stardust grains demonstrate many aspects of nucleosynthesis within the stars from which the grains condensed during the star's late-life mass-loss episodes.[12]
Explosive nucleosynthesis[edit]
Main articles: r-process, rp-process, and Supernova nucleosynthesis
Supernova nucleosynthesis occurs in the energetic environment in supernovae, in which the elements between silicon and nickel are synthesized in quasiequilibrium[13] established during fast fusion that attaches by reciprocating balanced nuclear reactions to 28Si. Quasiequilibrium can be thought of as almost equilibrium except for a high abundance of the 28Si nuclei in the feverishly burning mix. This concept[14] was the most important discovery in nucleosynthesis theory of the intermediate-mass elements since Hoyle's 1954 paper because it provided an overarching understanding of the abundant and chemically important elements between silicon (A=28) and nickel (A=60). It replaced the incorrect although much cited alpha process of the B2FH paper, which inadvertently obscured Hoyle's better 1954 theory.[15] Further nucleosynthesis processes can occur, in particular the r-process (rapid process) described by the B2FH paper and first calculated by Seeger, Fowler and Clayton,[16] in which the most neutron-rich isotopes of elements heavier than nickel are produced by rapid absorption of free neutrons. The creation of free neutrons by electron capture during the rapid compression of the supernova core along with assembly of some neutron-rich seed nuclei makes the r-process a primary process, and one that can occur even in a star of pure H and He. This is in contrast to the B2FH designation of the process as a secondary process. This promising scenario, though generally supported by supernova experts, has yet to achieve a totally satisfactory calculation of r-process abundances. The primary r-process has been confirmed by astronomers who have observed old stars born when galactic metallicity was still small, that nonetheless contain their complement of r-process nuclei; thereby demonstrating that the metallicity is a product of an internal process. The r-process is responsible for our natural cohort of radioactive elements, such as uranium and thorium, as well as the most neutron-rich isotopes of each heavy element.
The rp-process (rapid proton) involves the rapid absorption of free protons as well as neutrons, but its role and its existence are less certain.
Explosive nucleosynthesis occurs too rapidly for radioactive decay to decrease the number of neutrons, so that many abundant isotopes with equal and even numbers of protons and neutrons are synthesized by the silicon quasiequilibrium process.[17] During this process, the burning of oxygen and silicon fuses nuclei that themselves have equal numbers of protons and neutrons to produce nuclides which consist of whole numbers of helium nuclei, up to 15 (representing 60Ni). Such multiple-alpha-particle nuclides are totally stable up to 40Ca (made of 10 helium nuclei), but heavier nuclei with equal and even numbers of protons and neutrons are tightly bound but unstable. The quasiequilibrium produces radioactive isobars 44Ti, 48Cr, 52Fe, and 56Ni, which (except 44Ti) are created in abundance but decay after the explosion and leave the most stable isotope of the corresponding element at the same atomic weight. The most abundant and extant isotopes of elements produced in this way are 48Ti, 52Cr, and 56Fe. These decays are accompanied by the emission of gamma-rays (radiation from the nucleus), whose spectroscopic lines can be used to identify the isotope created by the decay. The detection of these emission lines were an important early product of gamma-ray astronomy.[18]
The most convincing proof of explosive nucleosynthesis in supernovae occurred in 1987 when those gamma-ray lines were detected emerging from supernova 1987A. Gamma ray lines identifying 56Co and 57Co nuclei, whose radioactive half-lives limit their age to about a year, proved that they were created by their radioactive cobalt parents. This nuclear astronomy observation was predicted in 1969[19] as a way to confirm explosive nucleosynthesis of the elements, and that prediction played an important role in the planning for NASA's Compton Gamma-Ray Observatory.
Other proofs of explosive nucleosynthesis are found within the stardust grains that condensed within the interiors of supernovae as they expanded and cooled. Stardust grains are one component of cosmic dust. In particular, radioactive 44Ti was measured to be very abundant within supernova stardust grains at the time they condensed during the supernova expansion.[20] This confirmed a 1975 prediction of the identification of supernova stardust (SUNOCONs), which became part of the pantheon of presolar grains. Other unusual isotopic ratios within these grains reveal many specific aspects of explosive nucleosynthesis.
Neutron star collision[edit]
It had been postulated that neutron star collisions are the main source of r-process elements.[21] In 2017 strong evidence for this theory emerged, when LIGO, VIRGO, the Fermi Gamma-ray Space Telescope and INTEGRAL, along with a collaboration of many observatories around the world, detected both gravitational and electromagnetic signatures of a likely neutron star collision, GW170817, and detected signals of heavy elements like gold.[22]
Cosmic ray spallation[edit]
Main article: Cosmic ray spallation
Cosmic ray spallation process reduces the atomic weight of interstellar matter by the impact with cosmic rays, to produce some of the lightest elements present in the universe (though not a significant amount of deuterium). Most notably spallation is believed to be responsible for the generation of almost all of 3He and the elements lithium, beryllium, and boron, although some 7
Li
and 7
Be
are thought to have been produced in the Big Bang. The spallation process results from the impact of cosmic rays (mostly fast protons) against the interstellar medium. These impacts fragment carbon, nitrogen, and oxygen nuclei present. The process results in the light elements beryllium, boron, and lithium in the cosmos at much greater abundances than they are found within solar atmospheres. The quantities of the light elements 1H and 4He produced by spallation are negligible relative to their primordial abundance.
Beryllium and boron are not significantly produced by stellar fusion processes, since 8Be is not particle-bound.
Empirical evidence[edit]
Theories of nucleosynthesis are tested by calculating isotope abundances and comparing those results with observed abundances. Isotope abundances are typically calculated from the transition rates between isotopes in a network. Often these calculations can be simplified as a few key reactions control the rate of other reactions.
Minor mechanisms and processes[edit]
Very small amounts of certain nuclides are produced on Earth by artificial means. Those are our primary source, for example, of technetium. However, some nuclides are also produced by a number of natural means that have continued after primordial elements were in place. These often act to produce new elements in ways that can be used to date rocks or to trace the source of geological processes. Although these processes do not produce the nuclides in abundance, they are assumed to be the entire source of the existing natural supply of those nuclides.
These mechanisms include:
Radioactive decay may lead to radiogenic daughter nuclides. The nuclear decay of many long-lived primordial isotopes, especially uranium-235, uranium-238, and thorium-232 produce many intermediate daughter nuclides, before they too finally decay to isotopes of lead. The Earth's natural supply of elements like radon and polonium is via this mechanism. The atmosphere's supply of argon-40 is due mostly to the radioactive decay of potassium-40 in the time since the formation of the Earth. Little of the atmospheric argon is primordial. Helium-4 is produced by alpha-decay, and the helium trapped in Earth's crust is also mostly non-primordial. In other types of radioactive decay, such as cluster decay, larger species of nuclei are ejected (for example, neon-20), and these eventually become newly formed stable atoms.
Radioactive decay may lead to spontaneous fission. This is not cluster decay, as the fission products may be split among nearly any type of atom. Thorium-232, uranium-235, and uranium-238 are primordial isotopes that undergo spontaneous fission. Natural technetium and promethium are produced in this manner.
Nuclear reactions. Naturally-occurring nuclear reactions powered by radioactive decay give rise to so-called nucleogenic nuclides. This process happens when an energetic particle from a radioactive decay, often an alpha particle, reacts with a nucleus of another atom to change the nucleus into another nuclide. This process may also cause the production of further subatomic particles, such as neutrons. Neutrons can also be produced in spontaneous fission and by neutron emission. These neutrons can then go on to produce other nuclides via neutron-induced fission, or by neutron capture. For example, some stable isotopes such as neon-21 and neon-22 are produced by several routes of nucleogenic synthesis, and thus only part of their abundance is primordial.
Nuclear reactions due to cosmic rays. By convention, these reaction-products are not termed "nucleogenic" nuclides, but rather cosmogenic nuclides. Cosmic rays continue to produce new elements on Earth by the same cosmogenic processes discussed above that produce primordial beryllium and boron. One important example is carbon-14, produced from nitrogen-14 in the atmosphere by cosmic rays. Iodine-129 is another example.
See also[edit]
Star portal
Stellar evolution
Supernova nucleosynthesis
Cosmic dust
Extinct isotopes of superheavy elements
Metallicity
References[edit]
Jump up ^ Donald D. Clayton, Handbook of isotopes in the cosmos, Cambridge University Press (Cambridge 2003)
Jump up ^ A.S. Eddington, The Internal Constitution of the Stars, The Observatory, 43, 341 (1920) http://adsabs.harvard.edu/abs/1920Obs....43..341E
Jump up ^ A.S. Eddington, The Internal Constitution of the Stars, Nature, 106, 106 (1920) http://adsabs.harvard.edu/abs/1920Natur.106...14E
Jump up ^ Actually, before the war ended, he learned about the problem of spherical implosion of plutonium in the Manhattan project. He saw an analogy between the plutonium fission reaction and the newly discovered supernovae, and he was able to show that exploding super novae produced all of the elements in the same proportion as existed on Earth. He felt that he had accidentally fallen into a subject that would make his career. Autobiography William A. Fowler
Jump up ^ E. M. Burbidge, G. R. Burbidge, W. A. Fowler, F. Hoyle, Synthesis of the Elements in Stars, Rev. Mod. Phys. 29 (1957) 547 (article at the Physical Review Online Archive (subscription required))
Jump up ^ H.E. Suess and H.C. Urey, Abundances of the elements, Revs. Mod. Phys., 28, 53 (1957)
Jump up ^ Donald D. Clayton, Handbook of isotopes in the cosmos, Cambridge University Press (Cambridge U.K. 2003)
Jump up ^ Massimo S. Stiavelli. From First Light to Reionization. John Wiley & Sons, Apr 22, 2009. Pg 8.
Jump up ^ Donald D. Clayton, Principles of Stellar Evolution and Nucleosynthesis, McGraw-Hill (New York 1968) Chapter 5; reissued by University of Chicago Press (Chicago 1883)
Jump up ^ D.D. Clayton, W.A. Fowler, T. Hull and B. Zimmerman, Neutron capture chains in heavy element synthesis, Ann. Phys., 12, 331-408 (1961); Donald D. Clayton, Principles of Stellar Evolution and Nucleosynthesis, McGraw-Hill (New York 1968) Chapter 7
Jump up ^ S. Paul W. Merrill (1952). "Spectroscopic Observations of Stars of Class S". The Astrophysical Journal. 116: 21. Bibcode:1952ApJ...116...21M. doi:10.1086/145589.
Jump up ^ Donald D. Clayton and L. R. Nittler (2004). "Astrophysics with Presolar Stardust". Annual Review of Astronomy and Astrophysics. 42 (1): 39–78. Bibcode:2004ARA&A..42...39C. doi:10.1146/annurev.astro.42.053102.134022.
Jump up ^ D. Bodansky, Donald D. Clayton, and W. A. Fowler, (1968) Nuclear quasi-equilibrium during silicon burning, Astrophys. J. Suppl. No. 148, 16, 299-371
Jump up ^ See also Chapter 7 of Donald D. Clayton, Principles of Stellar Evolution and Nucleosynthesis, McGraw-Hill, New York (1968)
Jump up ^ Donald D. Clayton, Hoyle's Equation, Science, 318, 1876-77 (2007)
Jump up ^ P.A.Seeger, W. A. Fowler, and Donald D. Clayton, Nucleosynthesis of heavy elements by neutron capture, Astrophys. J. Suppl, 11, 121-66, (1965)
Jump up ^ D. Bodansky, Donald D. Clayton, and W. A. Fowler, (1968) Nuclear quasi-equilibrium during silicon burning, Astrophys. J. Suppl. No. 148, 16 299-371
Jump up ^ Donald D. Clayton, Stirling A. Colgate and G. J. Fishman (1969) Gamma ray lines from young supernova remnants, Astrophys. J.. 155 175
Jump up ^ D. D. Clayton; S.A. Colgate; G.J. Fishman (1969). "Gamma ray lines from young supernova remnants". The Astrophysical Journal. 155: 75–82. Bibcode:1969ApJ...155...75C. doi:10.1086/149849.
Jump up ^ D. D. Clayton; L. R.Nittler (2004). "Astrophysics with Presolar stardust". Annual Review of Astronomy and Astrophysics. 42 (1): 39–78. Bibcode:2004ARA&A..42...39C. doi:10.1146/annurev.astro.42.053102.134022.
Jump up ^ Stromberg, Joseph. "All the Gold in the Universe Could Come From the Collisions of Neutron Stars". Smithsonian. Retrieved 27 April 2014.
Jump up ^ https://www.ligo.caltech.edu/page/press-release-gw170817
Further reading[edit]
Burbidge, E. Margaret; Burbidge, G. R.; Fowler, William A.; Hoyle, F. (1 October 1957). "Synthesis of the Elements in Stars". Reviews of Modern Physics. 29 (4): 547–650. Bibcode:1957RvMP...29..547B. doi:10.1103/RevModPhys.29.547.
Meneguzzi, M.; Audouze, J.; Reeves, H. (1971). "The Production of the Elements Li, Be, B by Galactic Cosmic Rays in Space and its Relation with Stellar Observations". Astronomy and Astrophysics. 15: 337–359. Bibcode:1971A&A....15..337M.
F. Hoyle, Monthly Notices Roy. Astron. Soc. 106, 366 (1946)
F. Hoyle, Astrophys. J. Suppl. 1, 121 (1954)
D. D. Clayton, "Principles of Stellar Evolution and Nucleosynthesis", McGraw-Hill, 1968; University of Chicago Press, 1983, ISBN 0-226-10952-6
C. E. Rolfs, W. S. Rodney, Cauldrons in the Cosmos, Univ. of Chicago Press, 1988, ISBN 0-226-72457-3.
D. D. Clayton, "Handbook of Isotopes in the Cosmos", Cambridge University Press, 2003, ISBN 0-521-82381-1.
C. Iliadis, "Nuclear Physics of Stars", Wiley-VCH, 2007, ISBN 978-3-527-40602-9
External links[edit]
The Valley of Stability (video) - nucleosynthesis explained in terms of the nuclide chart, by CEA (France)
[hide]
v
t
e
Nuclear processes
Radioactive
decay
Alpha decay
Beta decay
Gamma radiation
Cluster decay
Double beta decay
Double electron capture
Internal conversion
Isomeric transition
Neutron emission
Positron emission
Proton emission
Spontaneous fission
Stellar
nucleosynthesis
Deuterium fusion
Lithium burning
pp-chain
CNO cycle
α process
Triple-α
C burning
Ne burning
O burning
Si burning
R-process
S-process
P-process
Rp-process
Other
processes
Photodisintegration
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