Cortés, M.L.; Rodriguez, W. ; Doornenbal, P. ; Obertelli, A. ; Holt, J.D. ; Lenzi, S.M. ; Menéndez, J. ; Nowacki, F. ; Ogata, K. ; Poves, A. et al..
Shell evolution of N = 40 isotones towards 60Ca: First spectroscopy of 62Ti
PHYSICS LETTERS B 800 Paper: 135071 , 7 p. (2020)
Published: 10 January 2020
Excited states in the isotone 62Ti were populated via the 63V62Ti reaction at ∼200 MeV/nucleon at the Radioactive Isotope Beam Factory and studied using γ-ray spectroscopy. The energies of the and transitions, observed here for the first time, indicate a deformed 62Ti ground state. These energies are increased compared to the neighboring 64Cr and 66Fe isotones, suggesting a small decrease of quadrupole collectivity. The present measurement is well reproduced by large-scale shell-model calculations based on effective interactions, while ab initio and beyond mean-field calculations do not yet reproduce our findings. The shell-model calculations for 62Ti show a dominant configuration with four neutrons excited across the gap. Likewise, they indicate that the island of inversion extends down to , disfavoring a possible doubly magic character of the elusive 60Ca.