Beta-decay of 32C1 and 40Sc

βdecay of32Cl: Precisionγ-ray spectroscopy and a measurement of isospin-symmetry breaking

“…+ states with E x < 7.2 MeV reported in Détraz et al [29]. We find that the RMS deviations of the shell-model calculation from the known excitation energies [12] are quite good: 120 keV (USD), 209 keV (USD-A) and 172 keV (USD-B).…”

“…We attribute this discrepancy to the fact that many of the higher levels not considered in Ref. [29] γ de-excite through these levels; thus though our γ-ray yields for these states are in good agreement, our γ-ray feeding from higher levels results in a smaller deduced β branch for these states. Another difference from Détraz et al is seen with the 7190 keV 1 + 3 level where we see less than half as much γ yield, and find a β branch that is 30% smaller.…”

“…The reason we present the yields after the discussion of the branches is because of the small summing corrections which depend on the branching ratios. The results are listed in Table III where we again compare the excitation energies to ENSDF [12] and the yields to the work of Détraz et al [29].…”

“…It is difficult to comment on this discrepancy since an efficiency curve is not provided in Ref. [29].…”

“…(5) (included in the analysis but omitted here for clarity) are required to account for (a) summing with cascade γs from above and below (which requires the total efficiency of the HPGe), and (b) summing with the 511 annihilation radiation since this is a β + decay. The nine lowest (0, 1, 2) + states observed by Détraz et al [29] and Anderson et al [30] along with the (1.0 +0.2 −0.5 )% ground state branch from Armini et al [25] represent most of the β yield; however little is known above 7.2 MeV of excitation energy. Some β-delayed proton and alpha decays have been observed [31] to states above 8.7 MeV with particle energies as low as 762 (5) keV, but this still leaves a 1.5 MeV window of Q-value in which no β transitions have been identified.…”