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Investigation of the ground-state spin inversion in the neutron-rich 47,49Cl isotopes

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arxiv 2110.03284 v1 pith:IZ4WTNJ6 submitted 2021-10-07 nucl-ex nucl-th

B.D. Linh , A. Corsi , A. Gillibert , A. Obertelli , P. Doornenbal , C. Barbieri , S. Chen , L.X. Chung
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T. Duguet M. Gómez-Ramos J.D. Holt A. Moro P. Navrátil K. Ogata N.T.T. Phuc N. Shimizu V. Somà Y. Utsuno N. L. Achouri H. Baba F. Browne D. Calvet F. Château N. Chiga M. L. Cortés 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 F. Flavigny S. Franchoo I. Gašparić R.-B. Gerst J. Gibelin K.I. 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. Söderström S. Takeuchi N.D. Ton H. Törnqvist V. Vaquero V. Wagner H. Wang V. Werner X. Xu Y. Yamada D. Yan Z. Yang M. Yasuda L. Zanetti
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A first gamma-ray study of 47,49Cl spectroscopy was performed at the Radioactive Isotope Beam Factory with 50Ar projectiles at 217 MeV/nucleon, impinging on the liquid hydrogen target of the MINOS device. Prompt de-excitation gamma-rays were measured with the NaI(Tl) array DALI2+. Through the one-proton knockout reaction 50Ar(p,2p), a spin assignment could be determined for the low-lying states of 49Cl from the momentum distribution obtained with the SAMURAI spectrometer. A spin-parity J = 3/2+ is deduced for the ground state of 49Cl, similar to the recently studied N = 32 isotope 51K.

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