On the origin of the solar-system abundances of In-113, Sn-114, and Sn-115

Astronomy and Astrophysics – Astrophysics

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Abundance, Chemical Evolution, Cosmochemistry, Indium Isotopes, Solar System, Tin Isotopes, Absorption Cross Sections, Decay Rates, Galactic Evolution, Neutron Activation Analysis, Neutron Cross Sections, Neutron Decay, Nuclear Fusion, Stellar Evolution, Stellar Models, Temperature Effects, Time Dependence

Scientific paper

In view of the great importance of the In-113, Sn-114, and Sn-115 nuclei as tests of various models of the p-process, a detailed s-process reaction network extending from s-only Cd-110 to s-only Sn-116 is constructed in order to examine the situation in this mass region in greater detail. It is considered important to ascertain whether the s- and r-processes together can completely reproduce the solar abundances of these nuclei since the photodisintegrating process of Woosley and Howard (1978) is conspicuous in its inability to reproduce the solar abundances of the odd-particle nuclei In-113 and Sn-115. The neutron-capture cross section of Cd-114 to the 53.38 h ground state in Cd-115 is measured via neutron activation. Using this result and the total neutron-capture rate of Cd-114, the relative population of Cd-115 /0/(53.38 h) is found to be 0.79 + or - 0.13 at an energy appropriate to 30 keV stellar neutrons.

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