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  • Fynbo, H. O. U.Århus Universitet,Aarhus University (author)

Revised rates for the stellar triple-alpha process from measurement of C-12 nuclear resonances

  • Article/chapterEnglish2005

Publisher, publication year, extent ...

  • Springer Science and Business Media LLC,2005

Numbers

  • LIBRIS-ID:oai:research.chalmers.se:d18812b7-9441-41c1-ba0e-0c0b7504b874
  • https://research.chalmers.se/publication/11544URI
  • https://doi.org/10.1038/nature03219DOI

Supplementary language notes

  • Language:English
  • Summary in:English

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  • Subject category:art swepub-publicationtype
  • Subject category:ref swepub-contenttype

Notes

  • In the centres of stars where the temperature is high enough, three alpha-particles (helium nuclei) are able to combine to form C-12 because of a resonant reaction leading to a nuclear excited state(1). (Stars with masses greater than similar to0.5 times that of the Sun will at some point in their lives have a central temperature high enough for this reaction to proceed.) Although the reaction rate is of critical significance for determining elemental abundances in the Universe(1), and for determining the size of the iron core of a star just before it goes supernova(2), it has hitherto been insufficiently determined(2). Here we report a measurement of the inverse process, where a C-12 nucleus decays to three alpha-particles. We find a dominant resonance at an energy of similar to11 MeV, but do not confirm the presence of a resonance at 9.1 MeV (ref. 3). We show that interference between two resonances has important effects on our measured spectrum. Using these data, we calculate the triple-a rate for temperatures from 10(7) K to 10(10) K and find significant deviations from the standard rates(3). Our rate below similar to5 x 10(7) K is higher than the previous standard, implying that the critical amounts of carbon that catalysed hydrogen burning in the first stars are produced twice as fast as previously believed(4). At temperatures above 10(9) K, our rate is much less, which modifies predicted nucleosynthesis in supernovae(5,6).

Subject headings and genre

Added entries (persons, corporate bodies, meetings, titles ...)

  • Diget, C. A.Århus Universitet,Aarhus University (author)
  • Bergmann, U. C.Organisation européenne pour la recherche nucléaire (CERN),European Organization for Nuclear Research (CERN) (author)
  • Borge, M. J. G.CSIC - Instituto de Estructura de la Materia (IEM) (author)
  • Cederkall, J.Organisation européenne pour la recherche nucléaire (CERN),European Organization for Nuclear Research (CERN) (author)
  • Dendooven, P. (author)
  • Fraile, L. M.Organisation européenne pour la recherche nucléaire (CERN),European Organization for Nuclear Research (CERN) (author)
  • Franchoo, S.Organisation européenne pour la recherche nucléaire (CERN),European Organization for Nuclear Research (CERN) (author)
  • Fedosseev, V. N.Organisation européenne pour la recherche nucléaire (CERN),European Organization for Nuclear Research (CERN) (author)
  • Fulton, B. R.University of York (author)
  • Huang, W. X.Jyväskylän Yliopisto,University of Jyväskylä (author)
  • Huikari, J.Jyväskylän Yliopisto,University of Jyväskylä (author)
  • Jeppesen, H. B.Århus Universitet,Aarhus University (author)
  • Jokinen, A. S.Helsingin Yliopisto,University of Helsinki,Jyväskylän Yliopisto,University of Jyväskylä (author)
  • Jones, P.Jyväskylän Yliopisto,University of Jyväskylä (author)
  • Jonson, Björn,1941Chalmers tekniska högskola,Chalmers University of Technology(Swepub:cth)bjn (author)
  • Koster, U.Organisation européenne pour la recherche nucléaire (CERN),European Organization for Nuclear Research (CERN) (author)
  • Langanke, K.Århus Universitet,Aarhus University (author)
  • Meister, Mikael,1969Chalmers tekniska högskola,Chalmers University of Technology(Swepub:cth)meister (author)
  • Nilsson, Thomas,1965Chalmers tekniska högskola,Chalmers University of Technology(Swepub:cth)tnilsson (author)
  • Nyman, Göran Hugo,1943Chalmers tekniska högskola,Chalmers University of Technology(Swepub:cth)f2bgn (author)
  • Prezado, Y.CSIC - Instituto de Estructura de la Materia (IEM) (author)
  • Riisager, K.Århus Universitet,Aarhus University (author)
  • Rinta-Antila, S.Jyväskylän Yliopisto,University of Jyväskylä (author)
  • Tengblad, O.CSIC - Instituto de Estructura de la Materia (IEM) (author)
  • Turrion, M.CSIC - Instituto de Estructura de la Materia (IEM) (author)
  • Wang, Y. B.Jyväskylän Yliopisto,University of Jyväskylä (author)
  • Weissman, L.Organisation européenne pour la recherche nucléaire (CERN),European Organization for Nuclear Research (CERN) (author)
  • Wilhelmsen, Katarina,1962Chalmers tekniska högskola,Chalmers University of Technology(Swepub:cth)katwil (author)
  • Aysto, J.Jyväskylän Yliopisto,University of Jyväskylä,Helsingin Yliopisto,University of Helsinki (author)
  • Århus UniversitetOrganisation européenne pour la recherche nucléaire (CERN) (creator_code:org_t)

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  • In:Nature: Springer Science and Business Media LLC433:7022, s. 136-1390028-08361476-46871476-4679

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