Effective axial-vector strength within proton-neutron deformed quasiparticle random-phase approximation
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
Published inPhysical Review C
© 2019 American Physical Society
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. ...
PublisherAmerican Physical Society
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Related funder(s)Academy of Finland
Funding program(s)Academy Project, AoF
Additional information about fundingThis work has been partially supported by grants of the Romanian Ministry of Research and Innovation, CNCSUEFISCDI, PN-III-P4-ID-PCE-2016-0092, PN-III-P4-DPCE-2016-0792, within PNCDI III, PN-19060105/2019, and by the Academy of Finland (Suomen Akatemia) under Academy Project No. 318043.
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