Improved molecular final-state distribution of HeT+ for the β-decay process of T2

An improved theoretical final-state distribution of HeT+ (and HeH+) resulting front the beta decay of molecular tritium T-2 (HT) is presented to accommodate the needs of increased accuracy in the analysis of ongoing and future tritium neutrino-mass experiments. The previously available theoretical spectrum has been improved in many respects,and adopted approximations have been validated.