0νββ and 2νββ nuclear matrix elements, quasiparticle random-phase approximation, and isospin symmetry restoration
By F. vSimkovic, V. Rodin, A. Faessler, P. Vogel. 2013
208 citations recorded by the source corpus.
Within the quasiparticle random-phase approximation (QRPA) we achieve partial restoration of the isospin symmetry and hence fulfillment of the requirement that the 2νββ Fermi matrix element M^(2ν)_F vanishes, as it should, unlike in the previous version of the method. This is accomplished by separating the renormalization parameter g_pp of the particle-particle proton-neutron interaction into isovector and isoscalar parts. The isovector parameter g^(T=1)_(pp) needs to be chosen to be essentially equal to the pairing constant g_pair, so no new parameter is needed. For the 0νββ decay the Fermi matrix element M^(0ν)_F is substantially reduced, while the full matrix element M^(0ν) is reduced by ≈10%. We argue that this more consistent approach should be used from now on in the proton-neutron QRPA and in analogous methods
Subfields: Nuclear and High Energy Physics
View Paper: https://www.semanticscholar.org/paper/6afd339861cfead28ed2494d1970ce400769b037
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In Nuclear and High Energy Physics
Citations in the corpus
- PandaX-III: Searching for neutrinoless double beta decay with high pressure 136Xe gas time projection chambers (2016, background): “Considering the spread of phase space factor [75, 76] and nuclear matrix elements [77, 78, 79, 80, 81, 82, 83] of NLDBD, the corresponding effective Majorana mass mββ ranges from 90 to 230 (65 to 165) meV.”
- Neutrinoless Double Beta Decay: 2015 Review (2016, methodology): “A good spectroscopy for parent and daughter nuclei is achieved • Quasiparticle Random Phase Approximation (QRPA), [139, 142].”