Conveners
7 Experiments in nuclear astrophysics: indirect methods
- Claudio Spitaleri (Universita' di Catania/INFN Catania)
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...
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...
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...
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...
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...
