Two neutrino double- β decay of 94 ≤ A≤ 150 nuclei for the 0 +→ 2 + transition

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