Evidence for octupole correlation in Z=50 Sn isotopes: Spectroscopy of Sn112

High-spin states in $^{112}\mathrm{Sn}$ were investigated using the $^{103}\mathrm{Rh}(^{12}\mathrm{C}, 1p2n$) reaction at a beam energy of 62 MeV. Six electric dipole $E1$ transitions linking positive- and negative-parity intruder bands have been identified in $_{50}^{112}\mathrm{Sn}$ through $\ensuremath{\gamma}$-ray spectroscopy. The experimental reduced $E1$ transition probabilities $B(E1)$, derived from level lifetimes by means of the Doppler-shift attenuation method, are of the order of ${10}^{\ensuremath{-}4}$ W.u., which gives evidence for the octupole correlation in $^{112}\mathrm{Sn}$. The systematics of the reduced $E1$ transition probabilities and neutron energy levels of $5/{2}^{+}$ and $11/{2}^{\ensuremath{-}}$ in Xe isotopes suggest an enhanced octupole correlation at neutron number $N=62$, which is supported by the relativistic Hartree-Bogoliubov calculations.