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Nuclei in the Cosmos - IX

25–30 Jun 2006
CERN, Geneva
Europe/Zurich timezone

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Session

7 Experiments in nuclear astrophysics: indirect methods

27 Jun 2006, 14:30
CERN, Geneva

CERN, Geneva

Conveners

7 Experiments in nuclear astrophysics: indirect methods

  • Claudio Spitaleri (Universita' di Catania/INFN Catania)

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  1. 44. Indirect techniques in nuclear astrophysics - ANCs and THM
    Robert Tribble (Texas A&M University)
    27/06/2006, 14:30
    Experiments in nuclear astrophysics
    Invited
    A puzzle in gamma ray astronomy has been the lack of a signal from the decay of 22Na in novae sites. The isotope should be produced in the Ne-Na cycle following the proton capture reaction 21Na(p,gamm)22Mg and then the beta decay of 22Mg to 22Na. A reaction that could play a role in understanding the lack of a signal gamma-ray astronomy is 22Mg(p,gamma)23Al. Depending on the stellar...
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  2. 89. Reaction rate of 15O(alpha,gamma)19Ne via indirect measurements
    Wanpeng Tan (University of Notre Dame)
    27/06/2006, 15:00
    Experiments in nuclear astrophysics
    Oral contribution
    15O(alpha,gamma) is one of the main breakout reactions from the hot CNO cycles, which triggers the thermonuclear runaways or X-ray bursts occurring in accreting neutron stars. A recent study has shown that this reaction is critical for the burst amplitude and periodicity of X-ray bursters. However, a direct measurement of this reaction rate at astrophysically relevant temperatures is not...
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  3. 59. Study of astrophysically important resonant states in 26Si by the 28Si(4He,6He)26Si reaction
    Young Kwan KWON (Department of Physics, Chung-Ang University, Seoul 156-756, Republic of Korea)
    27/06/2006, 15:20
    Experiments in nuclear astrophysics
    Oral contribution
    The emission of 1.809 MeV gamma-ray from the first excited state of 26Mg followed by beta-decay of 26Al in its ground state (26Alg.s.) has been identified by gamma-ray telescopes such the Compton Gamma-Ray Observatory (CGRO). To resolve controversy over the possible sources of the observational 1.809 MeV gamma-rays, one needs accurate knowledge of the production rate of 26Al. The...
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  4. 171. Influences on the triple alpha process beyond the Hoyle state
    Christian Aa. Diget (Department of Physics and Astronomy, University of Aarhus, DK-8000 Aarhus C, Denmark)
    27/06/2006, 15:40
    Experiments in nuclear astrophysics
    Oral contribution
    The triple alpha process, the fusion of three alpha particles, is responsible for the main stellar production of 12C. It is known that the rate of this process is dominated by the 7.65 MeV resonance predicted by Hoyle and identified in 1953 [1]. At present two reaction rates are widely employed [2,3]. Work is ongoing to improve these rates both at the most important temperature range...
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  5. 279. Experimental determination of reaction rates via Coulomb dissociation
    Tohru Motobayashi (RIKEN Nishina Center for Accelerator-Based Science)
    27/06/2006, 16:00
    Experiments in nuclear astrophysics
    Invited
    Intermediate-energy Coulomb dissociation using fast radioactive-isotope (RI) beams has been employed to study astrophysical (p,gamma) reactions. This method has an advantage of large cross sections and high experimental efficiency. Several experiments have been performed so far at fragmentation-based RI-beam facilities like, GSI, MSU and RIKEN. The most studied case is for the...
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