Structure of46Ti at low excitation energy

Abstract

The nucleus ${}^{46}$Ti has been studied with the reaction ${}^{42}$Ca(${}^{7}$Li,$p$2n)${}^{46}$Ti at a bombarding energy of 31 MeV. Thin target foils backed with a thick Au layer were used. Five new levels of negative parity were observed. Several lifetimes have been determined with the Doppler shift attenuation method. Low-lying experimental negative-parity levels are assigned to three bands with ${K}^{\ensuremath{\pi}}={3}^{\ensuremath{-}}$, ${0}^{\ensuremath{-}}$, and ${4}^{\ensuremath{-}}$, which are interpreted in terms of the large-scale shell model, considering particle-hole excitations from ${d}_{3/2}$ and ${s}_{1/2}$ orbitals. Shell model calculations were performed using a few effective interactions. However, good agreement was not achieved in the description of either negative- or positive-parity low-lying levels.