Abstract
A complete calculation of phase space factors (PSFs) for Majoron-emitting decay modes is presented. The calculation makes use of exact Dirac wave functions with finite nuclear size and electron screening and includes lifetimes, single-electron spectra, summed electron spectra, and angular electron correlations. Combining these results with recent microscopic interacting boson model nuclear matrix elements (NMEs) we make half-life predictions for the ordinary Majoron decay (spectral index ). Furthermore, comparing theoretical predictions with the obtained experimental lower bounds for this decay mode we are able to set limits on the effective Majoron-neutrino coupling constant .
- Received 13 April 2015
- Revised 20 May 2015
DOI:https://doi.org/10.1103/PhysRevC.91.064310
©2015 American Physical Society