A first glimpse at the shell structure beyond 54Ca: Spectroscopy of 55K, 55Ca, and 57Ca

Koiwai, T.; Wimmer, K.; Doornenbal, P.; Obertelli, A.; Barbieri, C.; Duguet, T.; Holt, J.D.; Miyagi, T.; Navratil, P.; Ogata, K.; Shimizu, N.; Soma, V.; Utsuno, Y.; Yoshida, K.; Achouri, N.L.; Baba, H.; Browne, F.; Calvet, D.; Chateau, F.; Chen, S.; Chiga, N.; Corsi, A.; Cortes, M.L.; Delbart, A.; Gheller, J.-.; Giganon, A.; Gillibert, A.; Hilaire, C.; Isobe, T.; Kobayashi, T.; Kubota, Y.; Lapoux, V.; Liu, H.N.; 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.; Yoneda, K.; Aktas, O.; Aumann, T.; Chung, L.X.; Flavigny, F.; Franchoo, S.; Gasparic, I.; Gerst, R.-.; Gibelin, J.; Hahn, K.I.; Kim, D.; Kondo, Y.; Koseoglou, P.; Lee, J.; Lehr, C.; Linh, B.D.; Lokotko, T.; Maccormick, M.; Moschner, K.; Nakamura, T.; Park, S.Y.; Rossi, D.; Sahin, E.; Soderstrom, P.-.; Sohler, D.; Takeuchi, S.; Toernqvist, H.; Vaquero, V.; Wagner, V.; Wang, S.; Werner, V.; Xu, X.; Yamada, H.; Yan, D.; Yang, Z.; Yasuda, M.; Zanetti, L.

doi:10.1016/j.physletb.2022.136953

States in the N=35 and 37 isotopes 55,57Ca have been populated by direct proton-induced nucleon removal reactions from 56,58Sc and 56Ca beams at the RIBF. In addition, the (p,2p) quasi-free single-proton removal reaction from 56Ca was studied. Excited states in 55K, 55Ca, and 57Ca were established for the first time via in-beam γ-ray spectroscopy. Results for the proton and neutron removal reactions from 56Ca to states in 55K and 55Ca for the level energies, excited state lifetimes, and exclusive cross sections agree well with state-of-the-art theoretical calculations using different approaches. The observation of a short-lived state in 57Ca suggests a transition in the calcium isotopic chain from single-particle dominated states at N=35 to collective excitations at N=37.

A first glimpse at the shell structure beyond 54Ca: Spectroscopy of 55K, 55Ca, and 57Ca / T. Koiwai, K. Wimmer, P. Doornenbal, A. Obertelli, C. Barbieri, T. Duguet, J.D. Holt, T. Miyagi, P. Navratil, K. Ogata, N. Shimizu, V. Soma, Y. Utsuno, K. Yoshida, N.L. Achouri, H. Baba, F. Browne, D. Calvet, F. Chateau, S. Chen, N. Chiga, A. Corsi, M.L. Cortes, A. Delbart, J.-. 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, W. Rodriguez, H. Sakurai, M. Sasano, D. Steppenbeck, L. Stuhl, Y.L. Sun, Y. Togano, T. Uesaka, K. Yoneda, O. Aktas, T. Aumann, L.X. Chung, F. Flavigny, S. Franchoo, I. Gasparic, R.-. Gerst, J. Gibelin, K.I. Hahn, D. Kim, 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, P.-. Soderstrom, D. Sohler, S. Takeuchi, H. Toernqvist, V. Vaquero, V. Wagner, S. Wang, V. Werner, X. Xu, H. Yamada, D. Yan, Z. Yang, M. Yasuda, L. Zanetti. - In: PHYSICS LETTERS. SECTION B. - ISSN 0370-2693. - 827:(2022 Apr 10), pp. 136953.1-136953.7. [10.1016/j.physletb.2022.136953]

A first glimpse at the shell structure beyond 54Ca: Spectroscopy of 55K, 55Ca, and 57Ca

Koiwai T.;Wimmer K.;Doornenbal P.;Obertelli A.;C. Barbieri;Duguet T.;Holt J. D.;Miyagi T.;Navratil P.;Ogata K.;Shimizu N.;Soma V.;Utsuno Y.;Yoshida K.;Achouri N. L.;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.;Liu H. N.;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.;Yoneda K.;Aktas O.;Aumann T.;Chung L. X.;Flavigny F.;Franchoo S.;Gasparic I.;Gerst R. -B.;Gibelin J.;Hahn K. I.;Kim D.;Kondo Y.;Koseoglou P.;Lee J.;Lehr C.;Linh B. D.;Lokotko T.;MacCormick M.;Moschner K.;Nakamura T.;Park S. Y.;Rossi D.;Sahin E.;Soderstrom P. -A.;Sohler D.;Takeuchi S.;Toernqvist H.;Vaquero V.;Wagner V.;Wang S.;Werner V.;Xu X.;Yamada H.;Yan D.;Yang Z.;Yasuda M.;Zanetti L.

2022

Abstract

States in the N=35 and 37 isotopes 55,57Ca have been populated by direct proton-induced nucleon removal reactions from 56,58Sc and 56Ca beams at the RIBF. In addition, the (p,2p) quasi-free single-proton removal reaction from 56Ca was studied. Excited states in 55K, 55Ca, and 57Ca were established for the first time via in-beam γ-ray spectroscopy. Results for the proton and neutron removal reactions from 56Ca to states in 55K and 55Ca for the level energies, excited state lifetimes, and exclusive cross sections agree well with state-of-the-art theoretical calculations using different approaches. The observation of a short-lived state in 57Ca suggests a transition in the calcium isotopic chain from single-particle dominated states at N=35 to collective excitations at N=37.

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Scheda completa (DC)

	Parole chiave
	
			Radioactive beams; Shell evolution; γ-ray spectroscopy;
		
	Settori scientifico-disciplinari dell'articolo
	
			Settore FIS/04 - Fisica Nucleare e Subnucleare
		
	Data di pubblicazione
	
			10-apr-2022
		
	Rivista in ANCE
	
			PHYSICS LETTERS. SECTION B
		
	DOI
	
			https://dx.doi.org/10.1016/j.physletb.2022.136953
		
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			Article (author)
		
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			01 - Articolo su periodico

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