The β-moments for the second-forbidden β-decay from137Cs,the CVC theory,and the residual interactions

Theβ-moments of the 7/2⁺(1.176 MeVβ ^?)3/2⁺ transition in the decay of¹³⁷Cs have been extracted from the available experimental data. We have obtained the following values: 〈R _ij 〉/R ²=0.035±0.020, 〈iT _ij 〉/R ²=0.067±0.036, and ?0.085≦〈S _ijk ～>/R ²≦0.085. These results show that theβ-moments are reduced with respect to those evaluated by means of the conventional pairing model. These quenching effects are similar to those previously found in the analyses of first-forbiddenβ-decays and are attributed to residual charge-exchange interactions. The results forΛ(=?〈iA _ij 〉/ξ〈R _ij 〉) are discussed in the light of the predicitons of the CVC theory.