P. LIPNIK ANDThe nuclear matrix element then takes the form (/||r 22 oT+|K)=a,a / (32)-1 / 2 (g 7/2 ||r 220 T+p3/2) +0^/2 (35)-W(d m \\ r 220 r+p 3 /2>, from which one gets, considering Eq. (7), Eq. (13), and Table VI:Ptff/aifiXf=lMp(220).In the case of Cs 137 , the experimental value p exp (220) = -0.11 and the cancellation between the matrix elements occurring in the leading term in p 2 of the theoretical shape-factor distribution confirms the almost single-particle character of the beta transition.The experimental value Ai, derived for the decay of CI 36 , indicates a considerable mixing of (^3/2) and (si/ 2 ) orbits in the initial wave function. Pure (J3/2) configuration would imply Ai=0 for the /3~ decay of Cl 36 into S 36 as well as for the transition of Cl 36 into Ar 36 by electron capture. This contradicts the experimental results 23 : Ai = -1.1±0.S, Ai< ec)
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