Possible antimagnetic rotational band in In114

Abstract

High-spin states of $^{114}\mathrm{In}$ were populated using the reaction $^{110}\mathrm{Pd}\phantom{\rule{4pt}{0ex}}(^{7}\mathrm{Li}, 3n)^{114}\mathrm{In}$ at a beam energy of 26 MeV. More than 30 new $\ensuremath{\gamma}$ transitions and 20 new levels are identified in $^{114}\mathrm{In}$. In total, three new bands and a short cascade are observed, among which a new negative-parity $\mathrm{\ensuremath{\Delta}}I=2$ band built on the $\ensuremath{\pi}{g}_{9/2}^{\ensuremath{-}2}{d}_{5/2}\ensuremath{\bigotimes}\ensuremath{\nu}{h}_{11/2}$ configuration before the backbend and the $\ensuremath{\pi}{g}_{9/2}^{\ensuremath{-}2}{d}_{5/2}\ensuremath{\bigotimes}\ensuremath{\nu}{h}_{11/2}^{3}$ configuration after the backbend is established. The properties of this band are discussed based on the classical particle-rotor model calculations. The predicted $B(E2)$ and ${\ensuremath{\mathfrak{I}}}^{(2)}/B(E2)$ ratios indicate that the $\mathrm{\ensuremath{\Delta}}I=2$ band after the backbend, has the characteristics of antimagnetic rotation. Meanwhile, the two-shears-like mechanism for the possible antimagnetic rotational band is examined by investigating the orientation of the angular momenta. A new positive-parity $\mathrm{\ensuremath{\Delta}}I=1$ band with the configuration of $\ensuremath{\pi}{g}_{9/2}^{\ensuremath{-}1}\ensuremath{\bigotimes}\ensuremath{\nu}({g}_{7/2}/{d}_{5/2}){h}_{11/2}^{2}$ is observed.