Band terminations in the valence space of86Zr

Abstract

High-spin states in ${}^{86}\mathrm{Zr}$ up to ${30}^{+}$ and ${27}^{\ensuremath{-}}$ were observed via the ${}^{58}\mathrm{Ni}{(}^{32}\mathrm{S},4p)$ reaction at 135 MeV beam energy using the combined GAMMASPHERE and MICROBALL systems. Calculations performed with the configuration-dependent shell-correction approach show that these states are built from six ${g}_{9/2}$ neutrons and at most four protons excited from the ${p}_{1/2}{,p}_{3/2}{,f}_{5/2}$ subshells to the ${g}_{9/2}$ subshell at small deformation. The highest observed states at ${27}^{\ensuremath{-}}$ and ${30}^{+}$ are interpreted as band-terminating states with the latter having the highest spin available in the valence space for ${}^{86}\mathrm{Zr}.$