Investigation of the level spectra of nuclei in the northeast region of doubly magic 40Ca with intruder orbit g9/2

This study utilizes large-scale shell model calculations with the extended pairing and multipole–multipole force model (EPQQM) to investigate low-lying states in the nuclei of 42 Ca, 42 Sc, and 42 - 44 Ti. The model space in this study includes the fp shell as well as the intruder g 9 / 2 orbit, which accurately reproduces the positive parity levels observed in the aforementioned nuclei and predicts high energy states with negative parity coupled with the intruder g 9 / 2 . The study further predicts two different configurations in 43 Ti at around 6 MeV, specifically π f 7 / 2 2 ν g 9 / 2 and π f 7 / 2 g 9 / 2 ν f 7 / 2 , both of which involve the intruder orbit g 9 / 2 . The levels coupled with the intruder g 9 / 2 in 44 Ti are predicted to lie between 7 and 11 MeV. The inclusion of the intruder orbit g 9 / 2 is crucial for the exploration of high energy states in the northeast region of the doubly magic nucleus 40 Ca.