Thermal neutron capture cross-section to 113Cd isomer for the study of s-process origin of 115Sn

Details Thermal neutron capture cross-section to 113Cd isomer for the study of s-process origin of 115Sn Thermal neutron capture cross-section to 113Cd isomer for the study of s-process origin of 115Sn

Jun 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aipc.1238..225h&link_type=abstract

TOURS SYMPOSIUM ON NUCLEAR PHYSICS AND ASTROPHYSICS-VII. AIP Conference Proceedings, Volume 1238, pp. 225-227 (2010).

Physics

Nuclear Physics

Neutrons, Statistical Models, Resonance Reactions And Scattering, Nuclear, Nucleosynthesis, Mass And Neutron Distributions, Thermal And Statistical Models, Resonance Reactions, Stellar Structure, Interiors, Evolution, Nucleosynthesis, Ages

Scientific paper

The astrophysical origin of a p-nucleus 115Sn has remained still an open question. The nucleus 115Sn may be produced by a weak branch of the s-process through a β-unstable isomer in 113Cd. However, a neutron capture cross-section to this isomer has not been measured with high accuracy at any energy. A neutron capture cross-section for the 112Cd(n,γ)113Cdm reaction has been measured with neutrons provided from a nuclear reactor. The nucleus 115Sn may be produced by a nucleosynthesis flow through 113Cdm in the s-process. We have obtained the thermal neutron capture cross-section of 0.028+/-0.009 [b] and the resonance integral of 1.1+/-0.3 [b] using a cadmium difference method. The cross-section ratio of the isomer to the ground state has been calculated as a function of the incident neutron energy, E, by using a statistical model. The calculated ratios are almost constant over a wide range of E<100 keV. We have evaluated the s-process contribution to the solar abundance of 115Sn using the classical steady-flow model. This calculated result has shown that the production through 113Cdm may be minor contribution to 115Sn.

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