Shell evolution of N = 40 isotones towards 60Ca: First spectroscopy of 62Ti

Cortes, M. L.; Rodriguez, W.; Doornenbal, P.; Obertelli, A.; Holt, J. D.; Lenzi, S. M.; Menendez, J.; Nowacki, F.; Ogata, K.; Poves, A.; Rodriguez, T. R.; Schwenk, A.; Simonis, J.; Stroberg, S. R.; Yoshida, K.; Achouri, L.; Baba, H.; Browne, F.; Calvet, D.; Chateau, F.; Chen, S.; Chiga, N.; Corsi, A.; Delbart, A.; Gheller, J-M; Giganon, A.; Gillibert, A.; Hilaire, C.; Isobe, T.; Kobayashi, T.; Kubota, Y.; Lapoux, V; Liu, H. N.; Motobayashi, T.; Murray, I; Otsu, H.; Panin, V; Paul, N.; Sakurai, H.; Sasano, M.; Steppenbeck, D.; Stuhl, L.; Sun, Y. L.; Togano, Y.; Uesaka, T.; Wimmer, K.; Yoneda, K.; Aktas, O.; Aumann, T.; Chung, L. X.; Flavigny, F.; Franchoo, S.; Gasparic, I; Gerst, R-B; Gibelin, J.; Hahn, K., I; Kim, D.; Koiwai, T.; Kondo, Y.; Koseoglou, R.; Lee, J.; Lehr, C.; Linh, D.; Lokotko, T.; MacCormick, M.; Moschner, K.; Nakamura, T.; Park, S. Y.; Rossi, D.; Sahin, E.; Sohler, D.; Soederstroem, R-A; Takeuchi, S.; Toernqvist, H.; Vaquero, V.; Wagner, V; Wang, S.; Werner, V; Xu, X.; Yamada, H.; Yan, D.; Yang, Z.; Yasuda, M.; Zanetti, L. (2020) Shell evolution of N = 40 isotones towards 60Ca: First spectroscopy of 62Ti. Physics Letters B, 800 . ISSN 0370-2693

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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.

Item Type:	Article
Uncontrolled Keywords:	Shell evolution ; Radioactive beams ; Gamma-ray spectroscopy
Subjects:	NATURAL SCIENCES > Physics
Divisions:	Division of Experimental Physics
Projects:	Project title Project leader Project code Project type Nuklearna struktura i reakcije: eksperimentima prema neutronskoj liniji kapanja-SR-ETNo Suzana Szilner IP-2013-11-7194 HRZZ Zemljovid atomskih jezgara - neutronski bogata strana-NeRiS-Land Suzana Szilner IP-2018-01-1257 HRZZ
Depositing User:	Igor Gašparić
Date Deposited:	22 Jan 2020 11:40
URI:	http://fulir.irb.hr/id/eprint/5296
DOI:	10.1016/j.physletb.2019.135071

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