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Global Calculations of Beta-Decay Properties Based on the Fayans Functional

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Abstract

An effective approximation to a fully self-consistent global description of beta-decay properties of nuclei within the theory of finite Fermi systems is presented. It is based on describing the ground state properties within the energy density functional proposed by Fayans and coauthors (DF3) and on the continuum quasiparticle random-phase approximation (CQRPA). The accuracy of global DF3 \(+\) CQRPA calculations is analyzed. For more than 200 (quasi)spherical nuclei with \(Z=18\) to 51 having half-lives in the range of \(T_{1/2}<5\) s, the experimental half-lives and delayed neutrons emission probabilities are described within a factor of two and three, respectively. A comparison is performed with the results of similar calculations based on state-of-the-art self-consistent models : the relativistic spherical RHB \(+\) RQRPA approach and deformed finite-amplitude method (FAM) and HFB \(+\) QRPA approaches, as well as the interacting shell model. A detailed analysis of beta-decay properties in the nickel isotopic chain that were obtained in various calculations allows us for determining basic mechanisms responsible for the sudden shortening of the half-lives that was found experimentally at RIKEN for isotopes heavier than the doubly magic \({}^{78}\)Ni nucleus. These are the contributions of first-forbidden (FF) transitions and multiphonon configurations and spin inversion of the respective ground states. The acceleration effect in question is highly sensitive to the balance of the contributions of Gamow–Teller (GT) and FF transitions to the total beta-decay rate. It is shown that, in nickel isotopes, the ratio of these contributions takes different values before and after the neutron-shell crossing at \(N=50\).

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ACKNOWLEDGMENTS

I am grateful to Yu.S. Lutostansky and S.V. Tolo- konnikov for stimulating discussions and help.

Funding

This work was supported in part by Russian Foundation for Basic Research (project no. 18-02-00670) and by Department of Neutrino Processes at National Research Center Kurchatov Institute.

I am grateful to IAEA for support of my participation in the Second and Third Coordination Meetings on the Research Project Development of a Reference Database for Beta-Delayed Neutron Emission.

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Authors and Affiliations

  1. National Research Center Kurchatov Institute, 123182, Moscow, Russia

    I. N. Borzov

  2. Bogoliubov Laboratory of Theoretical Physics, Joint Institute for Nuclear Research, 141980, Dubna, Russia

    I. N. Borzov

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Borzov, I.N. Global Calculations of Beta-Decay Properties Based on the Fayans Functional. Phys. Atom. Nuclei 83, 700–713 (2020). https://doi.org/10.1134/S1063778820050087

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