Abstract
Excited states in the N=40 isotone 62Ti were populated via the 63V(p,2p)62Ti reaction at ∼200 MeV/nucleon at the Radioactive Isotope Beam Factory and studied using γ-ray spectroscopy. The energies of the 21+→0gs+ and 41+→21+ 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 N=40 gap. Likewise, they indicate that the N=40 island of inversion extends down to Z=20, disfavoring a possible doubly magic character of the elusive 60Ca.
Highlights
Excited states in the N = 40 isotone 62Ti were populated via the 63V(p, 2p)62Ti reaction at ∼200 MeV/nucleon at the Radioactive Isotope Beam Factory and studied using γ -ray spectroscopy
Our understanding of atomic nuclei largely derives from the concept of nuclear shell structure
The arrangement of nucleons inside the nucleus can be explained by the filling of discrete energy levels
Summary
These calculations predict an increase in the E(2+1 ) energy of the more exotic N = 40 isotones 62Ti and 60Ca, while conserving the intruder character in the ground state.
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