Alignment of theK=2−Octupole and Ground-Band Angular Momenta inW180

Abstract

Excitation of the $K={2}^{\ensuremath{-}}$ octupole band up to the ${14}^{\ensuremath{-}}$ member in the reaction $^{181}\mathrm{Ta}(p, 2n\ensuremath{\gamma})^{180}\mathrm{W}$ shows an odd-even energy staggering. This staggering can be interpreted in terms of different Coriolis-induced alignments of the rotational and octupole vibrational angular momenta for the odd- and even-spin members of the $K={2}^{\ensuremath{-}}$ octupole band. There is no evidence that the $K={2}^{\ensuremath{-}}$ octupole vibration decomposes into two-quasiparticle decoupled states even at the highest spins observed.