1303.4124 (J. Kotila et al.)

Phase space factors for $β^+β^+$ decay and competing modes of
double-$β$ decay    [PDF]

J. Kotila, F. Iachello

A complete and improved calculation of phase space factors (PSF) for $2\nu\beta^+\beta^+$ and $0\nu\beta^+\beta^+$ decay, as well as for the competing modes $2\nu EC\beta^+$, $0\nu EC\beta^+$, and $2\nu ECEC$, is presented. The calculation makes use of exact Dirac wave functions with finite nuclear size and electron screening and includes life-times, single and summed positron spectra, and angular positron correlations.

View original: http://arxiv.org/abs/1303.4124