Abstract:
Within the PHFB approach, the 0+ → 2+ transition of two neutrino double-β decay of 94,96Zr, 100Mo, 104Ru, 110Pd, 128,130Te and 150Nd isotopes is studied employing wave functions generated with four
different parametrizations of the pairing plus multipole type of two-nucleon interaction and the summation
method. In comparison to the 0+ → 0+ transition, the nuclear transition matrix elements M2ν(2+) are
quite sensitive to the deformation of the yrast 2+ state. Consideration of the available theoretical and
experimental results suggests that the observation of the 0+ → 2+ transition of 2νβ−β− decay may be
possible in 96Zr, 100Mo, 130Te and 150Nd isotopes. The effect of deformation on the M2ν(2+) is also studied
