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

Physics Letters B

Y. Kondo¹  A. Gillibert²  K. Yoneda²  J.D. Holt³  D. Calvet⁴  A. Corsi⁵  L.X. Chung⁶  K. Yoshida⁷  T. Duguet⁸  Y. Utsuno⁹  K. Ogata^1,10  V. Werner^1,11  M. Yasuda^1,12  C. Barbieri^1,13  H. Baba^1,14  V. Vaquero^1,15  D. Kim^1,16  M.L. Cortés^1,17  I. Gasparic^1,18  I. Murray^1,18  X. Xu^1,18  J. Lee^1,18  N. Shimizu^1,18  K. Wimmer^1,18  A. Obertelli^1,18  S. Takeuchi^1,19  A. Giganon^2,20  C. Hilaire^2,20  A. Delbart^2,21  M. MacCormick^2,21  T. Nakamura^2,22  E. Sahin^2,23  T. Koiwai^2,24  P. Doornenbal^2,24  Y. Togano^2,25  V. Somà^2,26  L. Zanetti^2,27  Z. Yang^2,27  T. Aumann^2,28  K. Moschner^2,28  W. Rodriguez^2,28  H.N. Liu^2,28  M. Sasano^2,28  K.I. Hahn^2,28  O. Aktas^2,28  V. Panin^2,28  N.L. Achouri^2,28  L. Stuhl^2,28  J.-M. Gheller^2,28  V. Lapoux^2,28  D. Steppenbeck^2,28  H. Sakurai^2,28  P. Navrátil^2,29  P.-A. Söderström^2,29  H. Yamada^3,30  D. Sohler^3,31  D. Yan^3,32  T. Isobe^3,32  J. Gibelin^3,33  N. Paul^3,33  Y. Kubota^3,33  C. Lehr^3,33  T. Kobayashi^3,33  B.D. Linh^3,33  F. Flavigny^3,33  Y.L. Sun^3,33  S.Y. Park^3,33  R.-B. Gerst^3,33  T. Miyagi^3,33  H. Otsu^3,33  T. Lokotko^3,33  D. Rossi^3,33  T. Uesaka^3,33  N. Chiga^3,34  S. Wang^3,35  T. Motobayashi^3,36  F. Browne^3,37  S. Chen^3,37  F. Château^3,37  P. Koseoglou^3,38  H. Toernqvist^3,39  S. Franchoo^3,39  V. Wagner^3,39 

[1] 4, place Jussieu, F-75005 Paris, France;Center for Nuclear Study, University of Tokyo, RIKEN campus, Wako, Saitama 351-0198, Japan;Corresponding author at: GSI Helmholtzzentrum für Schwerionenforschung GmbH, Planckstr. 1, D-64291 Darmstadt, Germany.;Department of Physics, McGill University, Montréal, QC H3A 2T8, Canada;Department of Physics, Osaka City University, Osaka 558-8585, Japan;Department of Physics, Royal Institute of Technology, SE-10691 Stockholm, Sweden;Department of Physics, University of Surrey, Guildford, GU2 7XH, United Kingdom;GSI Helmholtzzentrum für Schwerionenforschung GmbH, Planckstr. 1, D-64291 Darmstadt, Germany;INFN, Sezione di Milano, Via Celoria 16, I-20133 Milano, Italy;IRFU, CEA, Université Paris-Saclay, F-91191 Gif-sur-Yvette, France;Institut für Kernphysik, Technische Universität Darmstadt, D-64289 Darmstadt, Germany;Institute for Basic Science, Daejeon 34126, South Korea;Instituto de Estructura de la Materia, CSIC, E-28006 Madrid, Spain;KU Leuven, Department of Physics and Astronomy, Instituut voor Kern- en Stralingsfysica, B-3001 Leuven, Belgium;LPC Caen, Normandie Univ, ENSICAEN, UNICAEN, CNRS/IN2P3, 14000 Caen, France;Laboratoire Kastler Brossel, Sorbonne Université, CNRS, ENS-PSL Research University, Collège de France, Case 74;Nambu Yoichiro Institute of Theoretical and Experimental Physics (NITEP), Osaka City University, Osaka 558-8585, Japan;RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan;Technology, VINATOM, 179 Hoang Quoc Viet, Cau Giay, Hanoi, Viet Nam;Advanced Science Research Center, Japan Atomic Energy Agency, Tokai, Ibaraki 319-1195, Japan;Center for Nuclear Study, University of Tokyo, RIKEN campus, Wako, Saitama 351-0198, Japan;Department of Physics, Rikkyo University, 3-34-1 Nishi-Ikebukuro, Toshima, Tokyo 172-8501, Japan;Department of Physics, Royal Institute of Technology, SE-10691 Stockholm, Sweden;Department of Physics, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan;Department of Physics, Tohoku University, Sendai 980-8578, Japan;Dipartimento di Fisica, Università degli Studi di Milano, Via Celoria 16, I-20133 Milano, Italy;Ewha Womans University, Seoul 120-750, South Korea;IRFU, CEA, Université Paris-Saclay, F-91191 Gif-sur-Yvette, France;Institut für Kernphysik, Technische Universität Darmstadt, D-64289 Darmstadt, Germany;Institut für Kernphysik, Universität zu Köln, D-50937 Cologne, Germany;;Institute for Nuclear Science &LPC Caen, Normandie Univ, ENSICAEN, UNICAEN, CNRS/IN2P3, 14000 Caen, France;RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan;Research Center for Nuclear Physics (RCNP), Osaka University, Ibaraki 567-0047, Japan;Ruđer Bošković Institute, Bijenička cesta 54, 10000 Zagreb, Croatia;State Key Laboratory of Nuclear Physics and Technology, Peking University, Beijing 100871, China;TRIUMF, 4004 Wesbrook Mall, Vancouver, BC V6T 2A3, Canada;Universidad Nacional de Colombia, Carr. 30 No. 45-03, Bogotá, Colombia;Université Paris-Saclay, CNRS/IN2P3, IJCLab, 91405 Orsay, France;

关键词: Radioactive beams;    γ-ray spectroscopy;    Shell evolution;   

DOI  :  

来源: DOAJ

【 摘 要 】

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.

【 授权许可】

Unknown