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

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arxiv 1110.3886 v2 pith:P5X3XIZP submitted 2011-10-18 nucl-th

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

classification nucl-th
keywords r-processbetadecaysfoundhalf-livesisotonesnucleosynthesistransitions
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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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.

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