Possible antimagnetic rotational band and neutron alignment in101Pd

Abstract

High-spin states of ${}^{101}$Pd were studied through in-beam $\ensuremath{\gamma}$-ray spectroscopy by using the reaction ${}^{68}$Zn(${}^{37}$Cl, $1p3n$). The band based on the ${h}_{11/2}$ neutron orbital was extended up to (${\frac{51}{2}}^{\ensuremath{-}}$), and the band based on the ${d}_{5/2}$ neutron orbital was revised. Various transitions decaying to these bands were observed, and consequently several side bands were established. Electric dipole transitions from the $\ensuremath{\nu}{h}_{11/2}$ band to the $\ensuremath{\nu}{d}_{5/2}$ band were also observed. The structure of the $\ensuremath{\nu}{h}_{11/2}$ band is discussed from the viewpoint of antimagnetic rotation based on a semiclassical particle-rotor model by taking neutron alignments into account. The possible existence of octupole correlations is also discussed on the basis of $B(E1)/B(E2)$ ratios for the decays of the $\ensuremath{\nu}{h}_{11/2}$ band.