Nuclear data sheets for A = 136

Energy levels of136Pm and136Nd via beta decay of136Sm and136Pm

“…Similarly, the spin-parity of the low-spin isomer is limited, but not so severely. In this case, the ratio of the # feeding of the 4 + level to that of the 6 + level was observed to be 1.6 times larger in the current work than in the experiment of [8] where decay from the 5 + level was said to be involved. Hence, this indicates that the # decay of the low-spin isomer occurs to the 4 + level.…”

“…The spin-parity of the high-spin isomer of 136Pro can be limited to either 5 + or 6-by the # degrees of forbiddenness. Either 5 + or 6-is consistent with the log f t of [8] ; in each case, some of the transitions to the 4 +, 6 +, 5-, and 7-levels are allowed and some first-forbidden [18]. Other choices require unacceptable second-forbidden transitions.…”

“…The additional levels, relative to the only previous work [8], are probably due in part to differences in the reactions which were used to produce radioactive Pm. In the work of [8] the highest Z produced was that of Pm and the reaction favored production of the high-spin #-decaying isomer. In this work the compound nuclei were isotopes of Gd and both the low-spin and the high-spin isomers of a36pm were present.…”

“…The energy levels and y-ray transitions of ~36Nd due to the/7-decay of ~36pm. The spin-parities are taken from [8,10] 136 60 Nd 76 Table 3. Approximate relative B(E2)'s for levels in 136Nd where the branching permitted the evaluation, M lIE 2 ratios are unknown and hence have not been included.…”

“…The relative intensities of the observed 7-rays enabled the assignment of spin-parity of 5 § to the parent level in 136pm, the/? decay half-life of which was measured as 107 s [8]. Lifetime and g-factor measurements have been made by Billowes et al [-9] using the 1 lOpd(3OSi ' 4n) reaction.…”