Competition of Neutron Capture and Beta Decay at the 85Kr and 151Sm Branchings, a Means to Estimate the s-Process Pulse Conditions
s-process abundances of heavy elements are successfully reproduced using an exponential distribution of neutron exposures [1,2]. This behavior has been explained as the result of a pulsed irradiation of s-process seed material in the He-shell of red giant stars . A possibility to ascertain the pulsed nature of the s-process is offered by the analysis of branchings in the synthesis path. A branching is the result of a competition between neutron capture and beta decay of a radioactive isotope situated on the path. The pulsed nature of the s-process can show up due to the interpulse decay of the radioactive branch point nucleus and the necessary reformation of its abundance during the next pulse.
KeywordsRadioactive Isotope Dura Bran Rb87 Sm151
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