Engel, J. and Šimkovic, F. and Vogel, P. (2014) Chiral two-body currents and neutrinoless double-β decay in the quasiparticle random-phase approximation. Physical Review C, 89 (6). Art. No. 064308. ISSN 0556-2813. https://resolver.caltech.edu/CaltechAUTHORS:20140714-095222440
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Abstract
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.
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| Additional Information: | © 2014 American Physical Society. Published 13 June 2014; Received 30 March 2014; Revised 19 May 2014. This work was supported by the US Department of Energy through Contract No. DE-FG02-97ER41019. F. Š. acknowledges the support by the VEGA Grant agency of the Slovak Republic under theContract No. 1/0876/12 and by the Ministry of Education, Youth and Sports of the Czech Republic under Contract No. LM2011027. | |||||||||
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| Issue or Number: | 6 | |||||||||
| Classification Code: | PACS number(s): 21.60.Jz, 23.40.Hc | |||||||||
| Record Number: | CaltechAUTHORS:20140714-095222440 | |||||||||
| Persistent URL: | https://resolver.caltech.edu/CaltechAUTHORS:20140714-095222440 | |||||||||
| Usage Policy: | No commercial reproduction, distribution, display or performance rights in this work are provided. | |||||||||
| ID Code: | 47163 | |||||||||
| Collection: | CaltechAUTHORS | |||||||||
| Deposited By: | Jason Perez | |||||||||
| Deposited On: | 14 Jul 2014 23:16 | |||||||||
| Last Modified: | 03 Mar 2020 13:01 |
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