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Chiral two-body currents and neutrinoless double-β decay in the quasiparticle random-phase approximation

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.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1103/PhysRevC.89.064308 DOIArticle
http://journals.aps.org/prc/abstract/10.1103/PhysRevC.89.064308PublisherArticle
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.
Funders:
Funding AgencyGrant Number
Department of Energy (DOE)DE-FG02-97ER41019
Slovak Republic VEGA Grant Agency1/0876/12
Ministry of Education, Youth and Sports of the Czech RepublicLM2011027
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 Oct 2019 06:50

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