Medium- and high-spin band structure of the chiral candidate132La
Physical Review C(2013)
摘要
Medium- and high-spin states of ${}^{132}$La have been studied based on the data obtained from ${}^{100}$Mo(${}^{36}\\text{S},p3n$) and ${}^{116}$Cd(${}^{23}\\text{Na},\\ensuremath{\\alpha}3n$) fusion-evaporation reactions using the EUROBALL and Gammasphere detector arrays, respectively. Triple-$\\ensuremath{\\gamma}$ coincidence relations, angular correlations, and linear polarizations of the observed $\\ensuremath{\\gamma}$ transitions have been deduced. The level scheme of ${}^{132}$La has been considerably extended, and unambiguous spin and parity values have been assigned to most of the excited states. The configuration of one of the bands is $\\ensuremath{\\pi}{g}_{7/2}{({h}_{11/2})}^{2}\\ensuremath{\\nu}{h}_{11/2}$ instead of the previously thought $\\ensuremath{\\pi}{h}_{11/2}\\ensuremath{\\nu}{h}_{11/2}$; thus its previously suggested magnetic rotational character cannot be upheld. The observed similarities between the level structures of ${}^{132}$La and ${}^{134}$Pr suggest the possible existence of a third $\\ensuremath{\\pi}{h}_{11/2}\\ensuremath{\\nu}{h}_{11/2}$ band in ${}^{132}$La that may show chiral features.
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