Onset of collectivity for argon isotopes close to N=32

B. D. Linh, A. Corsi, A. Gillibert, A. Obertelli, P. Doornenbal, C. Barbieri, T. Duguet, M. Gomez-Ramos, J. D. Holt, B. S. Hu, T. Miyagi, A. M. Moro, P. Navratil, K. Ogata,S. Peru, N. T. T. Phuc, N. Shimizu, V. Soma, Y. Utsuno,N. L. Achouri, H. Baba, F. Browne, D. Calvet, F. Chateau, S. Chen,N. Chiga, M. L. Cortes, A. Delbart,J. -M. Gheller, A. Giganon, C. Hilaire, T. Isobe, T. Kobayashi,Y. Kubota, V. Lapoux, H. N. Liu, T. Motobayashi, I. Murray,H. Otsu, V. Panin, N. Paul, W. Rodriguez,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. Gasparic,R. B. Gerst, J. Gibelin,K. Hahn, N. T. Khai,D. Kim, T. Koiwai, Y. Kondo, P. Koseoglou,J. Lee, C. Lehr, T. Lokotko, M. Maccormick,K. Moschner,T. Nakamura,S. Y. Park,D. Rossi, E. Sahin,D. Sohler, P. -A. Soederstroem, S. Takeuchi, H. Toernqvist, V. Vaquero,V. Wagner, S. T. Wang, V. Werner, X. Xu, Y. Yamada, D. Yan, Z. Yang, M. Yasuda, L. Zanetti

PHYSICAL REVIEW C(2024)

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摘要
The shell closure at N = 32 has been investigated by a first spectroscopy of the N = 31 nucleus 49Ar at the Radioactive Isotope Beam Factory. Using the 50Ar(p, pn) reaction channel in inverse kinematics, 50Ar projectiles at 217 MeV/nucleon impinged on a 150 mm long liquid hydrogen target, part of the MINOS device. Prompt deexcitation gamma rays were measured with the NaI(Tl) array DALI2+. Reaction products were analyzed with the SAMURAI spectrometer, which allowed the measurement of the momentum distributions and angular momentum transfer. Data were compared to state-of-the-art theoretical predictions, including shell -model, energy -density functional, and ab initio calculations. An onset of collectivity is suggested besides the spherical configuration typical of a closed shell nucleus, such as for 52Ca.
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