The competition of tensor interaction and neutron-proton pairing in the beta-decay of the neutron-rich isotopes

E O Sushenok,N N Arsenyev,A P Severyukhin,I N Borzov

doi:10.1051/epjconf/201920109011

Abstract

The effects of the residual interaction in the particle-particle channel on β-decay characteristics and the multi-neutron emission probabilities in the β-decay of 126,128,130,132Cd are studied within the quasiparticle random phase approximation with the Skyrme interaction. The coupling between one-and two-phonon terms in the wave functions of the low-energy 1+ states of the daughter nuclei is taken into account. It is shown that the inclusion of the spin-isospin interaction in the particle-particle channel leads to the reduction of half-lives and redistribution of one-and two-neutron emission probabilities. The competition of tensor interaction and neutron-proton pairing in the β-decay characteristics of the neutron-rich Cd isotopes is discussed.

Highlights

Study of the β-decay properties of the neutron-rich Cd isotopes near the neutron closed-shell N=82 plays the crucial role in the modeling of the astrophysical r-process [1,2,3,4,5]
The multi-neutron emission is a multistep process consisting of the β-decay of the parent nucleus (N, Z) which results in feeding the excited states of the daughter nucleus (N−1, Z+1) followed by the multi-neutron emissions to the ground state or γ-deexcitation to the ground state of the product nucleus (N−1−X, Z+1) [6]
One of the successful tools for studying the charge-exchange nuclear modes is the quasiparticle random phase approximation (QRPA) with the self-consistent mean-field derived from a Skyrme energy-density functional (EDF), see e.g., [8,9,10,11]

Summary

Introduction

Study of the β-decay properties of the neutron-rich Cd isotopes near the neutron closed-shell N=82 plays the crucial role in the modeling of the astrophysical r-process [1,2,3,4,5]. [16], in which the properties of lowest quadrupole states in the neutron-rich nuclei near 132Sn were studied within the FRSA for the Skyrme-QRPA.

Results

Conclusion