Beta Decays of Isotones with Neutron Magic Number of N=126 and R-process Nucleosynthesis

Abstract

Beta decays of the isotones with N=126 are studied by shell model calculations taking into account both the Gamow-Teller (GT) and first-forbidden (FF) transitions. The FF transitions are found to be important to reduce the half-lives, by nearly twice to several times, from those by the GT contributions only. Possible implications of the short half-lives of the waiting point nuclei on the r-process nucleosynthesis during the supernova explosions are discussed. A slight shift of the third peak of the element abundances in the r-process toward higher mass region is found.

10 pages, 5 figures

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• Neutrino-Nucleus Reaction Cross Sections for Light Element Synthesis in Supernova Explosions
• Neutrino Nucleus Reactions based on New Shell Model Hamiltonians
• Heavy element nucleosynthesis in a collapsar

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