6533b7d8fe1ef96bd12696f7

RESEARCH PRODUCT

Calculation of allowed and first-forbidden beta-decay transitions of odd-odd nuclei

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Abstract A method for calculating the β − and β + EC transitions from an odd-odd nucleus to the excited states of the adjacent even-even nucleus is presented. The beta transitions are treated combining the charge-conserving and the charge-changing mode of the quasi-particle random- phase approximation assuming a common vacuum. The beta-decay transitions are treated in their allowed and first-forbidden approximations, including also the ground-state transition. As a test case of the present formalism, detailed beta-decay properties of the following odd-odd-to-even-even transitions have been calculated and compared with experiment: the β − decay transitions 136 I (2 − )→ 136 Xe (J π ) and 136 Cs (5 + ) → 136 Ba (J π ) , as well as the β + EC transitions 136 La (1 + → 136 Ba (J π ) . The calculated results agree nicely with data.