Band crossings in theγ-soft nucleusNd136

Energy levels of136Pm and136Nd via beta decay of136Sm and136Pm

“…The existence of a ground state band with 0 +, 2 +, 4 +, and 6 + levels is acceptable, having been observed both in fl decay and in in-beam yrast cascades [10,16]. Assignment of the 862.5-keV level as the band head for the gamma band is reasonable for a nucleus in this region.…”

“…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 spins from 2 + to 5 + are taken from [10]. Also, they are consistent with an IBA-1 calculation of Maino and Ventura [17], who described the structure of 136Nd as a nucleus with almost pure 0(6) symmetry, The 2035.9-and 2439.9-keV levels in the decay scheme were observed in recent in-beam experiments [10,16] and were assigned spin-parities 5-and 7-, because El prays connect them with the 4 + and 6 + levels, respectively. The spin-parity of the high-spin isomer of 136Pro can be limited to either 5 + or 6-by the # degrees of forbiddenness.…”

“…Lifetime and g-factor measurements have been made by Billowes et al [-9] using the 1 lOpd(3OSi ' 4n) reaction. Paul et al [10] have identified many rotational bands in ~36Nd in an in-beam experiment.…”

Multiphononγ-vibrational bands in theγ-soft nucleus138Nd

“…Two-phonon γ -vibrational bands (2γ bands) have been identified also, such as in 104,105,106 Mo [1][2][3] and 103 Nb [4] in the A = 100 region, and in 154 Gd [5] and 166,168 Er [6,7] in the A = 160 region. For the A = 130-140 region, 1γ bands have been reported in many cases, for example, in 132,134,136 Nd [8][9][10]. But so far, no 2γ band has been identified in this mass region.…”