DSpace at EWHA: First spectroscopic study of 51Ar by the (p,2p) reaction

View : 564 Download: 0

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

Authors: Juhász M.M.; Elekes Z.; Sohler D.; Utsuno Y.; Yoshida K.; Otsuka T.; Ogata K.; Doornenbal P.; Obertelli A.; Baba H.; Browne F.; Calvet D.; Château F.; Chen S.; Chiga N.; Corsi A.; Cortés 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.; Dombrádi Z.; Flavigny F.; Franchoo S.; Gašparić 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.; Söderström P.-A.; Takeuchi S.; Törnqvist H.; Vaquero V.; Wagner V.; Wang S.; Werner V.; Xu X.; Yamada H.; Yan D.; Yang Z.; Yasuda M.; Zanetti L.

Journal Title: Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics

Citation: Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics vol. 814

Keywords: Invariant mass method; Nuclear structure; Proton knock-out reaction; Shell closure; γ-ray spectroscopy

Abstract: The nuclear structure of 51Ar, 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 50Ar+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 50Ar. The low cross sections populating the two bound states of 51Ar 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 51Ar. © 2021 The Author(s)