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First spectroscopic study of 51Ar by the (p,2p) reaction

Juhasz, M. M.; Elekes, Z.; Sohler, D.; Utsuno, Y.; Yoshida, K.; Otsuka, T.; Ogata, K.; Doornenbal, P.; Obertelli, A.; Baba, H.; Browne, F.; Calvet, D.; Chateau, F.; Chen, S.; Chiga, N.; Corsi, A.; Cortes, M. L.; Delbart, A.; Gheller, J-M; Giganon, A.; Gillibert, A.; Hilaire, C.; Isobe, T.; Kobayashi, T.; Kubota, Y.; Lapoux, V; Motobayashi, T.; Murray, I; Otsu, H.; Panin, V; Paul, N.; Rodriguez, W.; Sakurai, H.; Sasano, M.; Steppenbeck, D.; Stuhl, L.; Sun, Y. L.; Togano, Y.; Uesaka, T.; Wimmer, K.; Yoneda, K.; Achouri, N. L.; Aktas, O.; Aumann, T.; Chung, L. X.; Dombradi, Zs; Flavigny, F.; Franchoo, S.; Gasparic, I; Gerst, R-B; Gibelin, J.; Hahn, K., I; Kim, D.; Koiwai, T.; Kondo, Y.; Koseoglou, P.; Lee, J.; Lehr, C.; Linh, B. D.; Liu, H. N.; Lokotko, T.; MacCormick, M.; Moschner, K.; Nakamura, T.; Park, S. Y.; Rossi, D.; Sahin, E.; Soderstrom, P-A; Takeuchi, S.; Tornqvist, H.; Vaquero, V.; Wagner, V; Wang, S.; Werner, V; Xu, X.; Yamada, H.; Yan, D.; Yang, Z.; Yasuda, M.; Zanetti, L. (2021) First spectroscopic study of 51Ar by the (p,2p) reaction. Physics letters. B, 814 . ISSN 0370-2693

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The nuclear structure of 51 Ar, an uncharted territory so far, was studied by the (p, 2p) reaction using γ -ray spectroscopy for the bound states and the invariant mass method for the unbound states. Two peaks were detected in the γ -ray spectrum and six peaks were observed in the 50 Ar+n relative energy spectrum. Comparing the results to our shell-model calculations, two bound and six unbound states were established. Three of the unbound states could only be placed tentatively due to the low number of counts in the relative energy spectrum of events associated with the decay through the first excited state of 50 Ar. The low cross sections populating the two bound states of 51 Ar could be interpreted as a clear signature for the presence of significant subshell closures at neutron numbers 32 and 34 in argon isotopes. It was also revealed that due to the two valence holes, unbound collective states coexist with individual-particle states in 51 Ar.

Item Type: Article
Uncontrolled Keywords: nuclear shell model ; proton knock-out reaction ; gamma-ray spectroscopy ; invariant-mass method ; radioactive beams
Subjects: NATURAL SCIENCES > Physics
Divisions: Division of Experimental Physics
Project titleProject leaderProject codeProject type
Zemljovid atomskih jezgara - neutronski bogata stranaSzilner, SuzanaIP-2018-01-1257HRZZ
Nuklearna struktura i reakcije: eksperimentima prema neutronskoj liniji kapanjaSzilner, SuzanaIP-2013-11-7194HRZZ
Depositing User: Igor Gašparić
Date Deposited: 01 Apr 2021 11:20
DOI: 10.1016/j.physletb.2021.136108

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