${}^{16}$O + ${}^{16}$O molecular structures of positive- and negative-parity superdeformed bands in ${}^{34}$S

The structures of excited states in ${}^{34}$S are investigated using the antisymmetrized molecular dynamics and generator coordinate method (GCM). The GCM basis wave functions are calculated via energy variation with a constraint on the quadrupole deformation parameter $\beta$. By applying the GCM after parity and angular momentum projections, the coexistence of two positive- and one negative-parity superdeformed (SD) bands are predicted, and low-lying states and other deformed bands are obtained. The SD bands have structures of ${}^{16}$O + ${}^{16}$O + two valence neutrons in molecular orbitals around the two ${}^{16}$O cores in a cluster picture. The configurations of the two valence neutrons are ${\delta }^2$ and ${\pi }^2$ for the positive-parity SD bands and ${\pi }^1{\delta }^1$ for the negative-parity SD band. The structural changes of the yrast states are also discussed.