Beta-decay half-lives at finite temperatures with the Skyrme-QRPA

Physics

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Random Phase Approximation, Beta-Decay, Neutron-Nucleus Reactions, Skyrmions, Normalising, Hartree-Fock And Random-Phase Approximations, Relation With Nuclear Matrix Elements And Nuclear Structure, Mass And Neutron Distributions, Skyrmions, Spectroscopic Factors And Asymptotic Normalization Coefficients

Scientific paper

Using finite temperature quasi-particle random phase approximation (FTQRPA) on the basis of finite temperature Skyrme-Hartree-Fock + BCS method, we study β--decay half-lives for even-even neutron magic nuclei with N = 82 in a finite temperature environment. We find that the β--decay half-life first decreases as the temperature increases for all the nuclei we study although the thermal effect is found to be small at temperatures relevant to r-process nucleosynthesis. Our calculations indicate that the half-life begins to increase at high temperatures for open shell nuclei. We discuss this behavior in connection to the pairing phase transition.

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