Deppisch, FF; Suhonen, J; (2016) Statistical analysis of beta decays and the effective value of g(A) in the proton-neutron quasiparticle random-phase approximation framework. Physical Review C , 94 (5) , Article 055501. 10.1103/PhysRevC.94.055501.

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Abstract

We perform a Markov chain Monte Carlo (MCMC) statistical analysis of a number of measured ground-state-to-ground-state single β+/electron-capture and β− decays in the nuclear mass range of A=62–142. The corresponding experimental comparative half-lives (logft values) are compared with the theoretical ones obtained by the use of the proton-neutron quasiparticle random-phase approximation (pnQRPA) with G-matrix-based effective interactions. The MCMC analysis is performed separately for 47 isobaric triplets and 28 more extended isobaric chains of nuclei to extract values and uncertainties for the effective axial-vector coupling constant gA in nuclear-structure calculations performed in the pnQRPA framework. As far as available, measured half-lives for two-neutrino ββ− decays occurring in the studied isobaric chains are analyzed as well.

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