Chiral two-body currents and neutrinoless double-β decay in the quasiparticle random-phase approximation
- NázevTitle
- Chiral two-body currents and neutrinoless double-β decay in the quasiparticle random-phase approximationChiral two-body currents and neutrinoless double-β decay in the quasiparticle random-phase approximation
- Druh výsledkuResult type
- Článek v časopiseJournal article
- AutořiAuthors
- J. Engel, F. Šimkovic, P. Vogel
- DOIDOI
- 10.1103/PhysRevC.89.064308
- Časopis / citaceJournal / citation
- Physical Review C. 2014, 89(6), ISSN 0556-2813.
- RokYear
- 2014
- JazykLanguage
- eng
- WoSWoS
- 000337342600002
- ScopusScopus
- 2-s2.0-84902519930
- RIVRIV
- RIV/68407700:21670/14:00225043!RIV15-MSM-21670___
- ProjektProject
- Institucionální podpora na rozvoj výzkumné org.Institucionální podpora na rozvoj výzkumné org.; Příspěvek k rozšíření velké výzkumné infrastruktury evropského významuContribution of the Czech Republic to the extension of the large research infrastructure of European importance
AbstraktAbstract
We test the effects of an approximate treatment of two-body contributions to the axial-vector current on the quasiparticle random-phase approximation (QRPA) matrix elements for neutrinoless double-beta decay in a range of isotopes. The form and strength of the two-body terms come from chiral effective-field theory. The two-body currents typically reduce the matrix elements by about 20%, not as much as in shell-model calculations. One reason for the difference is that standard practice in the QRPA is to adjust the strength of the isoscalar pairing interaction to reproduce two-neutrino double-beta decay lifetimes. Another may be the larger QRPA single-particle space. Whatever the reasons, the effects on neutrinoless decay are significantly less than those on two-neutrino decay, both in the shell model and the QRPA.
We test the effects of an approximate treatment of two-body contributions to the axial-vector current on the quasiparticle random-phase approximation (QRPA) matrix elements for neutrinoless double-beta decay in a range of isotopes. The form and strength of the two-body terms come from chiral effective-field theory. The two-body currents typically reduce the matrix elements by about 20%, not as much as in shell-model calculations. One reason for the difference is that standard practice in the QRPA is to adjust the strength of the isoscalar pairing interaction to reproduce two-neutrino double-beta decay lifetimes. Another may be the larger QRPA single-particle space. Whatever the reasons, the effects on neutrinoless decay are significantly less than those on two-neutrino decay, both in the shell model and the QRPA.