Coupling charge-exchange vibrations to nucleons in a relativistic framework: Effect on Gamow-Teller transitions and β-decay half-lives

Robin, Caroline; Litvinova, Elena

doi:10.1103/physrevc.98.051301

Title: Coupling charge-exchange vibrations to nucleons in a relativistic framework: Effect on Gamow-Teller transitions and β-decay half-lives

Journal Article · 20 November 2018 · Physical Review C

DOI: https://doi.org/10.1103/physrevc.98.051301 · OSTI ID:1609317

Robin, Caroline ^[1]; Litvinova, Elena ^[2]

Univ. of Washington, Seattle, WA (United States); Michigan State Univ., East Lansing, MI (United States); DOE/OSTI
Michigan State Univ., East Lansing, MI (United States); Western Michigan Univ., Kalamazoo MI (United States)

The nuclear response theory for isospin-transfer modes in the relativistic particle-vibration coupling framework is extended to include coupling of single nucleons to isospin-flip (charge-exchange) phonons in addition to the usual neutral vibrations. This new coupling introduces dynamical pion and ρ -meson exchange beyond the Hartree-Fock approximation up to infinite order. We investigate the impact of this new mechanism on the Gamow-Teller response of a few doubly magic neutron-rich nuclei, namely, ⁴⁸Ca, ⁷⁸Ni, ¹³²Sn, and ²⁰⁸Pb . It is found that the coupling to isospin-flip vibrations can have a non-negligible impact on the strength distribution and quenching of the giant resonance, globally improving the agreement with the experimental data. The corresponding β -decay half-lives of ⁷⁸Ni and ¹³²Sn are also calculated and found to be decreased by a factor of ~2 by the inclusion of the new phonons.

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Research Organization:: Univ. of Washington, Seattle, WA (United States)

Sponsoring Organization:: USDOE; USDOE Office of Science (SC)

Grant/Contract Number:: FG02-00ER41132

OSTI ID:: 1609317

Journal Information:: Physical Review C, Journal Name: Physical Review C Journal Issue: 5 Vol. 98; ISSN PRVCAN; ISSN 2469-9985

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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