Spectroscopic study of ⁴⁰K

The sd - pf interface nuclei usually exhibit the characteristic of spherical single-particle excitation spectra and their spectra are well explained by the spherical shell-model. It is now possible to study these nuclei at higher angular momentum and excitation energy using sophisticated detectors and advanced data acquisition systems. As a result, the coexistence of single-particle and collective excitations have been noticed in a few sd-pf interface nuclei viz. ⁴⁰Ca, etc.⁴⁰K is the isobaric partner nucleus of ⁴⁰Ca. So, in ⁴⁰K, we may also expect generation of collective excitations at higher excitation energy from multi-particle multi-hole excitations. ⁴⁰K nucleus was previously studied through heavy-ion reaction. Several states with excitation energy up to 8 MeV and spin up to 10^- have been discovered. They have assigned the spin and parity of these levels tentatively based on the comparison of the branching ratios to the Weisskopf value. Therefore, our primary motivation is to investigate the high-spin structure of ⁴⁰K and assign or confirm the spin and parity of these levels in ⁴⁰K