BETA SPECTRUM OF 124SB

The repeated measurements of Langer et al. and Canty et al. do not agree on the magnitude of D in the modified Bij shape. A recent analysis including circular polarization and the former's value of D yielded the matrix element set compatible with CVC theory, whereas the value of D by Canty et al. yielded matrix elements incompatible with CVC theory. The present work gives D = 7.3 ± 1 in good agreement with Canty et al. The statistical accuracy of the present measurement is good enough to distinguish between the different predictions of matrix element sets. A correlation is shown between D and W0 and the calibration constant. The discrepancy in the results of Langer et al. can be understood on this basis. The existence of beta groups with endpoint energies 1579 and 1656 keV is inferred from the FK analysis. © 1969.