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