Band structure in 180Re and the different coupling schemes in a deformed doubly odd nucleus.

Abstract

Rotational bands in the odd-odd nucleus $^{180}\mathrm{Re}$ have been studied via the $^{176}\mathrm{Yb}$${(}^{10}$B,6n) and $^{181}\mathrm{Ta}$(\ensuremath{\alpha},5n) fusion-evaporation reactions. A completely new high-spin level scheme has been obtained comprising four \ensuremath{\Delta}I=1 bands and a \ensuremath{\Delta}I=2 band. The \ensuremath{\Delta}I=1 structures can be understood from quasiparticle states in neighboring odd nuclei and the \ensuremath{\Delta}I=2 band is interpreted as a new example of a double decoupled sequence based on the decoupled ${h}_{9/2}$ proton and a ${(1/2}^{\mathrm{\ensuremath{-}}}$[521] neutron. The different coupling schemes in a deformed doubly odd nucleus are discussed.