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