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Sensitivity of β-decay rates to the radial dependence of the nucleon effective mass

Abstract : We analyze the sensitivity of β-decay rates in Ni78 and Sn100,132 to a correction term in Skyrme energy-density functionals (EDFs) which modifies the radial shape of the nucleon effective mass. This correction is added on top of several Skyrme parametrizations which are selected from their effective mass properties and predictions about the stability properties of Sn132. The impact of the correction on high-energy collective modes is shown to be moderate. From the comparison of the effects induced by the surface-peaked effective mass in the three doubly magic nuclei, it is found that Sn132 is largely impacted by the correction, while Ni78 and Sn100 are only moderately affected. We conclude that β-decay rates in these nuclei can be used as a test of different parts of the nuclear EDF: Ni78 and Sn100 are mostly sensitive to the particle-hole interaction through the B(GT) values, while Sn132 is sensitive to the radial shape of the effective mass. Possible improvements of these different parts could therefore be better constrained in the future.
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Contributor : Sophie Heurteau <>
Submitted on : Wednesday, April 8, 2015 - 2:58:52 PM
Last modification on : Wednesday, September 16, 2020 - 4:08:36 PM

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A. P. Severyukhin, J. Margueron, I. N. Borzov, N. van Giai. Sensitivity of β-decay rates to the radial dependence of the nucleon effective mass. Physical Review C, American Physical Society, 2015, 91 (3), pp.034322. ⟨10.1103/PhysRevC.91.034322⟩. ⟨in2p3-01140395⟩



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