Astronomy and Astrophysics – Astrophysics
Scientific paper
Sep 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983a%26a...125..381k&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 125, no. 2, Sept. 1983, p. 381-387.
Astronomy and Astrophysics
Astrophysics
11
Absorption Cross Sections, Neutron Emission, Nuclear Astrophysics, Radioactive Decay, Stellar Radiation, Capture Effect, Heavy Nuclei, Neutron Cross Sections, Nuclear Fusion, Radioactive Isotopes, Statistical Analysis
Scientific paper
It is demonstrated that the decay mode of beta-delayed neutron emission can, in principle, be considered as the inverse process to neutron capture. This decay mode may disclose level parameters of neutron-emitting states that can serve in two ways to predict neutron capture rates for unstable isotopes of astrophysical interest: (1) for medium and heavy mass nuclei, where due to the high level density the capture rate is not dominated by single resonances, information on the density and quantum numbers of states populated in the Gamow-Teller beta-decay yields a lower limit of the neutron capture cross section; and (2) for nuclides near closed shells, particularly for light-mass nuclei, individual neutron capture resonances may dominate the total cross section. The reaction Kr-86(n, gamma) Kr-87(on stable Kr-86) is discussed for the first case while the reaction Ca-49(n, gamma) Ca-50(T1/2 /Ca-49/ = 8.7 min) with its inverse process is discussed for the second case.
Hillebrandt Wolfgang
Kratz Karl Ludwig
Thielemann Friederich-Karl
Ziegert W.
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