Astronomy and Astrophysics – Astrophysics
Scientific paper
1999-10-11
Phys.Rev. C61 (2000) 015801
Astronomy and Astrophysics
Astrophysics
11 pages, 5 figures, Latex, accepted for publication in Phys. Rev. C
Scientific paper
10.1103/PhysRevC.61.015801
We study here the onset of thermal equilibrium affecting the lifetimes of 26Al and 34Cl nuclei within a hot astrophysical photon gas. The 26Al isotope is of prime interest for gamma ray astronomy with the observation of its delayed (t_1\2=0.74 My) 1.809MeV gamma-ray line. Its nucleosynthesis is complicated by the presence of a short lived (t_1\2=6.34s) spin isomer. A similar configuration is found in 34Cl where the decay of its isomer (34mCl, t_1\2=32m) is followed by delayed gamma-ray emission with characteristic energies. The lifetimes of such nuclei are reduced at high temperature by the thermal population of shorter lived levels. However, thermal equilibrium within 26Al and 34Cl levels is delayed by the presence of the isomer. We study here the transition to thermal equilibrium where branching ratios for radiative transitions are needed in order to calculate lifetimes. Since some of these very small branching ratios are not known experimentally, we use results of shell model calculations.
Coc Alain
Nowacki Frederic
Porquet Marie-Geneviève
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