GT neutrino-nuclear responses for double beta decays and astro neutrinos

Gamow-Teller nuclear matrix elements (NMEs) for pairs of ground-state-to-ground-state transitions, in particular their geometric mean NME , are studied. The observed means in the medium-heavy mass region are compared with the corresponding single-quasiparticle (qp) NMEs and the means calculated by t...

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Bibliographic Details
Published in:Journal of physics. G, Nuclear and particle physics Nuclear and particle physics, 2015-05, Vol.42 (5), p.55201
Main Authors: Ejiri, H, Suhonen, J
Format: Article
Language:English
Subjects:
Approximation
astro neutrino nucleosynthesis
astro neutrino response
Beta decay
beta decay matrix element
Coefficients
double beta decay
Gamow-Teller beta decay
Interaction parameters
Mathematical analysis
Nucleons
Particle physics
QRPA nuclear matrix element
quenching of
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Summary:Gamow-Teller nuclear matrix elements (NMEs) for pairs of ground-state-to-ground-state transitions, in particular their geometric mean NME , are studied. The observed means in the medium-heavy mass region are compared with the corresponding single-quasiparticle (qp) NMEs and the means calculated by the proton neutron qp random-phase approximation (pnQRPA). The NMEs turn out to be insensitive to the nucleon occupancy/vacancy amplitudes and to the particle-particle interaction parameter of the pnQRPA. The observed mean NMEs are found to be reduced by a coefficient relative to the effective qp NMEs and by a coefficient with respect to the pnQRPA NMEs. The reductions associated with the spin isospin correlations and nuclear medium effects, and their impact on nuclear double beta decays and astro-neutrino-nuclear interactions are discussed.
ISSN:0954-3899
1361-6471
DOI:10.1088/0954-3899/42/5/055201