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Report No.
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Shell evolution of $$N$$ = 40 isotones towards $$^{60}$$Ca; First spectroscopy of $$^{62}$$Ti

Cort$'e$s, M. L.*; Rodriguez, W.*; Doornenbal, P.*; Obertelli, A.*; Holt, J. D.*; Lenzi, S. M.*; Men$'e$ndez, J.*; Nowacki, F.*; Ogata, Kazuyuki*; Poves, A.*; Rodr$'i$guez, T. R.*; Schwenk, A.*; Simonis, J.*; Stroberg, S. R.*; Yoshida, Kazuki; Achouri, L.*; Baba, Hidetada*; Browne, F.*; Calvet, D.*; Ch$^a$teau, F.*; Chen, S.*; Chiga, Nobuyuki*; Corsi, A.*; Delbart, A.*; Gheller, J.-M.*; Giganon, A.*; Gillibert, A.*; Hilaire, C.*; Isobe, Tadaaki*; Kobayashi, Toshio*; Kubota, Yuki*; Lapoux, V.*; Liu, H. N.*; Motobayashi, Toru*; Murray, I.*; Otsu, Hideaki*; Panin, V.*; Paul, N.*; Sakurai, Hiroyoshi*; Sasano, Masaki*; Steppenbeck, D.*; Stuhl, D.*; Sun, Y. L.*; Togano, Yasuhiro*; Uesaka, Tomohiro*; Wimmer, K.*; Yoneda, Kenichiro*; Aktas, O.*; Aumann, T.*; Chung, L. X.*; Flavigny, F.*; Franchoo, S.*; Ga$v{s}$pari$'c$, I.*; Gerst, R.-B.*; Gibelin, J.*; Hahn, K. I.*; Kim, D.*; Koiwai, Takuma*; Kondo, Yosuke*; Koseoglou, P.*; Lee, J.*; Lehr, C.*; Linh, B. D.*; Lokotko, T.*; MacCormick, M.*; Moschner, K.*; Nakamura, Takashi*; Park, S. Y.*; Rossi, D.*; Sahin, E.*; Sohler, D.*; S$"o$derstr$"o$m, P.-A.*; Takeuchi, Satoshi*; T$"o$rnqvist, H.*; Vaquero, V.*; Wagner, V.*; Wang, S.*; Werner, V.*; Xu, X.*; Yamada, Hiroki*; Yan, D.*; Yang, Z.*; Yasuda, Masahiro*; Zanetti, L.*

Excited states in the $$N$$ = 40 isotone $$^{62}$$Ti were populated via the $$^{63}$$V($$p$$,$$2p$$)$$^{62}$$Ti reaction at $$sim$$200 MeV/nucleon at the Radioactive Isotope Beam Factory and studied using $$gamma$$-ray spectroscopy. The energies of the $$2_1^+ rightarrow 0_{rm gs}^+$$ and $$4_1^+ rightarrow 2_1^+$$ transitions, observed here for the first time, indicate a deformed Ti ground state. These energies are increased compared to the neighboring $$^{64}$$Cr and $$^{66}$$Fe 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.

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Category:Astronomy & Astrophysics

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