A1 Journal article (refereed)
Effective axial-vector strength within proton-neutron deformed quasiparticle random-phase approximation (2019)

Delion, D. S., Dumitrescu, A., & Suhonen, J. (2019). Effective axial-vector strength within proton-neutron deformed quasiparticle random-phase approximation. Physical Review C, 100(2), Article 024331. https://doi.org/10.1103/PhysRevC.100.024331

JYU authors or editors

Publication details

All authors or editors: Delion, D. S.; Dumitrescu, A.; Suhonen, J.

Journal or series: Physical Review C

ISSN: 2469-9985

eISSN: 2469-9993

Publication year: 2019

Volume: 100

Issue number: 2

Article number: 024331

Publisher: American Physical Society

Publication country: United States

Publication language: English

DOI: https://doi.org/10.1103/PhysRevC.100.024331

Publication open access: Not open

Publication channel open access: 

Publication is parallel published (JYX): https://jyx.jyu.fi/handle/123456789/65386

Abstract

We use the available experimental Gamow-Teller β− and β+/EC (electron-capture) decay rates between 0+ and 1+ ground states in neighboring even-even and odd-odd nuclei, combined with 2νββ half-lives, to analyze the influence of the nuclear environment on the weak axial-vector strength gA. For this purpose, the proton-neutron deformed quasiparticle random-phase approximation (pn-dQRPA), with schematic dipole residual interaction is employed. The Hamiltonian contains particle-hole (ph) and particle-particle (pp) channels with mass-dependent strengths. In deriving the equations of motion we use a self-consistent procedure in terms of a single-particle basis with projected angular momentum provided by the diagonalization of a spherical mean field plus the quadrupole-quadrupole interaction. Our analysis evidenced a quenched average effective value ⟨gA⟩ ≈ 0.7 with a root-mean-square deviation of σ ≈ 0.3 for transitions from even-even emitters and σ ≈ 0.6 for transitions from odd-odd emitters.

Keywords: nuclear physics

Free keywords: beta decay; electroweak interactions in nuclear physics; lifetimes and widths; nuclear structure and decays

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Ministry reporting: Yes

Reporting Year: 2019

JUFO rating: 2