ISSN:
1434-601X
Keywords:
21.60
;
23.40
Source:
Springer Online Journal Archives 1860-2000
Topics:
Physics
Notes:
Abstract Nuclear matrix elements for double positron emisson (β + β +), positron emission/electron capture (β +/ EC) and double electron capture (EC/EC) in the 2νββ decay mode and forβ + β + andβ +/EC decay in the 0νββ mode are calculated for the experimentally most promising isotopes58Ni,78Kr,96Ru,106Cd,124Xe,130Ba and136Ce within pn-QRPA. We point out that the matrix element for the 2νβ +/EC decay differs from the 2νβ + β + matrix element, an effect not considered previously. For the neutrino accompanied decays our calculation predicts for theβ +/EC and the EC/EC mode half lives which are shorter typically by 4–7 orders of magnitude than those for the double positron emission. However, even for the best candidates typical values for 2νβ +/EC (2ν EC/EC) are still in the range of ∼1022 ((some) 1021) years. For 0νββ decay we have calculated all matrix elements relevant for both, the mass mechanism and the right-handed currents for the first time complete. A detailed discussion of the differences between the 0νβ +β+, the 0νβ +/EC and 0νβ − β − decay is given.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF01292371
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