Deformation effect on the double Gamow-Teller matrix element of 100Mo for the 0+→0+ transition

The two neutrino double beta decay of Mo-100 for the 0(+) --> 0(+) transition is studied in the Hartree-Fock-Bogoliubov (HFB) framework. Prior to the calculation of the double Gamow-Teller matrix element M-GT(2v), the reliability of the intrinsic wave functions has been established by obtaining an overall agreement between a number of theoretically calculated spectroscopic properties and the available experimental data for Mo-100 and Ru-100. It has been further noticed that there is a necessity of an appropriate amount of deformation in the HFB intrinsic state to obtain a realistic M-GT(2v).