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

Author

Engel Jonathan, Prof.	Department of Physics and Astronomy, University of North Carolina, Chapel Hill, North Carolina 27516-3255, USA
Šimkovic Fedor, prof. RNDr. CSc.	IEAP
Vogel Petr, Prof.	Kellogg Radiation Laboratory, California Institute of Technology, Pasadena, California 91125, USA

Year

2014

Scientific journal

Phys. Rev. C 89, 064308

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.

Projects

NEMO 3
TGV (measurement of double beta decay of ⁴⁸Ca and ¹⁰⁶Cd)
SuperNEMO

Cite article as:

J. Engel, F. Šimkovic, P. Vogel, "Chiral two-body currents and neutrinoless double-β decay in the quasiparticle random-phase approximation", Phys. Rev. C 89, 064308 (2014)