Nuclear structure calculations of twoneutrino doublebeta decay transitions to excited final states
Abstract
The halflives for twoneutrino doublebeta decay transitions to the excited 2 _{1}^{+} and 0 _{1}^{+} states for several nuclei are calculated in the framework of a second quasirandomphase approximation (QRPA). In addition, other singlebeta and B(E2) transitions are evaluated and compared with experimental data. We find satisfactory agreement with data when we tried to describe unitarily, with the same set of parameters, all the computed physical quantities. The sum rule, which is fulfilled accurately in the framework of the protonneutron QRPA, is violated insignificantly by our method. The higherorder QRPA terms only influence the β^{+} strengths which enter the doublebeta decay rate formula, shifting them to higher QRPA energies.
 Publication:

Nuclear Physics A
 Pub Date:
 February 1996
 DOI:
 10.1016/03759474(96)001224
 Bibcode:
 1996NuPhA.602..197S