New high-spin band structures in 184Hg.

Abstract

The high-spin states in $^{184}\mathrm{Hg}$ have been investigated via the $^{154}\mathrm{Gd}$ ${(}^{32}$S,4n) reaction at a beam energy of 160 MeV, with an array of Compton suppressed Ge detectors in the Spin Spectrometer at HHIRF. The ground state oblate band and excited prolate band were extended to ${10}^{+}$ and ${26}^{+}$, respectively, and seven new bands are observed. A new band with odd spins, 13 to 25, has a much larger moment of inertia than the other bands in $^{184}\mathrm{Hg}$. Two of the new bands feed the prolate excited band and are interpreted as quadrupole vibrational bands. Also, two new signature partner bands are observed for which the configuration of \ensuremath{\nu}${\mathit{i}}_{13/2}$${\mathit{f}}_{7/2}$ is proposed. The similarity of the band with odd spins to the band with intermediate deformation (${\mathrm{\ensuremath{\beta}}}_{2}$\ensuremath{\sim}0.34) in $^{186}\mathrm{Hg}$, and signature partner bands to the bands observed in 104 isotones $^{180}\mathrm{Os}$ and $^{182}\mathrm{Pt}$, is discussed.