High-spin structure in ${}^{40}$K

Abstract

High-spin states of ${}^{40}$K have been populated in the fusion-evaporation reaction ${}^{12}$C(${}^{30}$Si,np)${}^{40}$K and studied by means of $\gamma$-ray spectroscopy techniques using one AGATA triple cluster detector, at INFN - Laboratori Nazionali di Legnaro. Several new states with excitation energy up to 8 MeV and spin up to $10^{-}$ have been discovered. These new states are discussed in terms of J=3 and T=0 neutron-proton hole pairs. Shell-model calculations in a large model space have shown a good agreement with the experimental data for most of the energy levels. The evolution of the structure of this nucleus is here studied as a function of excitation energy and angular momentum.

23 pages, 5 figures, submitted to Phys. Rev. C