A. Bobyk et Wa. Kaminski, 2-NEUTRINO DOUBLE-BETA DECAY TRANSITION TO A 2(-STATE() EXCITED), Journal of physics. G, Nuclear and particle physics, 21(2), 1995, pp. 229-235
The Gamow-Teller matrix elements of 2 nu beta beta transitions to a 2(
1)(+) final excited state has been calculated within the QRPA formalis
m for Ge-76 and Xe-136. The relative stability of the calculation with
respect to the particle-particle interaction strength is confirmed; o
n the other hand, the results are strongly dependent on the choice of
the single-particle energy levels. A plausible explanation of such beh
aviour, originating in the interference of the individual contribution
s due to the third power of the energy denominator, has been proposed.