Shell evolution of $N=40$ isotones towards $^{60}$Ca: First spectroscopy of $^{62}$Ti
Shell evolution of $N=40$ isotones towards $^{60}$Ca: First spectroscopy of $^{62}$Ti
Excited states in the $N=40$ isotone $^{62}$Ti were populated via the $^{63}$V$(p,2p)$$^{62}$Ti reaction at $\sim$200~MeV/u at the Radioactive Isotope Beam Factory and studied using $\gamma$-ray spectroscopy. The energies of the $2^+_1 \rightarrow 0^{+}_{\mathrm{gs}}$ and $4^+_1 \rightarrow 2^+_1$ transitions, observed here for the first time, indicate a deformed $^{62}$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. The shell-model calculations for $^{62}$Ti 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 $^{60}$Ca.
L. X. Chung、A. Obertelli、S. R. Stroberg、S. Y. Park、M. L. Cort¨|s、T. Kobayashi、H. Sakurai、T. Motobayashi、X. Xu、F. Nowacki、P. -A. S?derstr?m、O. Aktas、A. Poves、V. Panin、D. Yan、N. Chiga、K. Yoneda、T. Lokotko、P. Doornenbal、Y. L. Sun、K. Yoshida、R. -B. Gerst、V. Wagner、Y. Kondo、M. Sasano、L. Achouri、B. D. Linh、P. Koseoglou、F. Chateau、F. Flavigny、F. Browne、N. Paul、J. Gibelin、K. I. Hahn、S. M. Lenzi、A. Gillibert、C. Lehr、H. Otsu、Y. Kubota、T. Aumann、E. Sahin、M. Yasuda、C. Hilaire、I. Ga?pari?、A. Schwenk、T. Koiwai、V. Werner、S. Chen、A. Giganon、D. Kim、J. D. Holt、H. N. Liu、S. Wang、H. Yamada、M. MacCormick、J. Men¨|ndez、K. Moschner、L. Stuhl、S. Takeuchi、K. Wimmer、A. Delbart、J. Simonis、J. Lee、D. Steppenbeck、T. Isobe、D. Rossi、S. Franchoo、Z. Yang、L. Zanetti、D. Sohler、I. Murray、V. Vaquero、H. Toernqvist、Y. Togano、V. Lapoux、W. Rodriguez、A. Corsi、K. Ogata、J-M. Gheller、H. Baba、T. R. Rodr¨aguez、T. Nakamura、T. Uesaka、D. Calvet
10.1016/j.physletb.2019.135071
物理学
L. X. Chung,A. Obertelli,S. R. Stroberg,S. Y. Park,M. L. Cort¨|s,T. Kobayashi,H. Sakurai,T. Motobayashi,X. Xu,F. Nowacki,P. -A. S?derstr?m,O. Aktas,A. Poves,V. Panin,D. Yan,N. Chiga,K. Yoneda,T. Lokotko,P. Doornenbal,Y. L. Sun,K. Yoshida,R. -B. Gerst,V. Wagner,Y. Kondo,M. Sasano,L. Achouri,B. D. Linh,P. Koseoglou,F. Chateau,F. Flavigny,F. Browne,N. Paul,J. Gibelin,K. I. Hahn,S. M. Lenzi,A. Gillibert,C. Lehr,H. Otsu,Y. Kubota,T. Aumann,E. Sahin,M. Yasuda,C. Hilaire,I. Ga?pari?,A. Schwenk,T. Koiwai,V. Werner,S. Chen,A. Giganon,D. Kim,J. D. Holt,H. N. Liu,S. Wang,H. Yamada,M. MacCormick,J. Men¨|ndez,K. Moschner,L. Stuhl,S. Takeuchi,K. Wimmer,A. Delbart,J. Simonis,J. Lee,D. Steppenbeck,T. Isobe,D. Rossi,S. Franchoo,Z. Yang,L. Zanetti,D. Sohler,I. Murray,V. Vaquero,H. Toernqvist,Y. Togano,V. Lapoux,W. Rodriguez,A. Corsi,K. Ogata,J-M. Gheller,H. Baba,T. R. Rodr¨aguez,T. Nakamura,T. Uesaka,D. Calvet.Shell evolution of $N=40$ isotones towards $^{60}$Ca: First spectroscopy of $^{62}$Ti[EB/OL].(2019-12-17)[2025-06-22].https://arxiv.org/abs/1912.07887.点此复制
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