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
- Klíčová slovaKeywords
- neutrinoless double beta decay, nuclear matrix element, Quasiparticle Random-Phase Approximation, two-body currents, chiral effective field theory (chi-EFT), shell model
- DOIDOI
- 10.1103/PhysRevC.89.064308
- Časopis / citaceJournal / citation
- Physical Review C 89(6), 064308 (2014) · ISSN 0556-2813
- RokYear
- 2014
- JazykLanguage
- eng
- ZáznamyRecords
- 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
- CitovánoCited by
- 76 (INSPIRE-HEP)
- Citace ke staženíDownload citation
- TXT · BibTeX
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.