Physics Letters B (Nov 2021)
Coexisting normal and intruder configurations in 32Mg
- N. Kitamura,
- K. Wimmer,
- A. Poves,
- N. Shimizu,
- J.A. Tostevin,
- V.M. Bader,
- C. Bancroft,
- D. Barofsky,
- T. Baugher,
- D. Bazin,
- J.S. Berryman,
- V. Bildstein,
- A. Gade,
- N. Imai,
- T. Kröll,
- C. Langer,
- J. Lloyd,
- E. Lunderberg,
- F. Nowacki,
- G. Perdikakis,
- F. Recchia,
- T. Redpath,
- S. Saenz,
- D. Smalley,
- S.R. Stroberg,
- Y. Utsuno,
- D. Weisshaar,
- A. Westerberg
Affiliations
- N. Kitamura
- Center for Nuclear Study, University of Tokyo, Wako, Saitama 351-0198, Japan; Corresponding author at: Department of Physics and Astronomy, University of Tennessee, Knoxville, TN 37996, USA.
- K. Wimmer
- Instituto de Estructura de la Materia, CSIC, 28006 Madrid, Spain; Department of Physics, University of Tokyo, Bunkyo, Tokyo 113-0033, Japan; Department of Physics, Central Michigan University, Mt. Pleasant, MI 48859, USA; National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, MI 48824, USA
- A. Poves
- Departamento de Física Teórica and IFT UAM-CSIC, Universidad Autónoma de Madrid, 28049 Madrid, Spain
- N. Shimizu
- Center for Nuclear Study, University of Tokyo, Wako, Saitama 351-0198, Japan
- J.A. Tostevin
- Department of Physics, University of Surrey, Guildford, Surrey GU2 7XH, United Kingdom
- V.M. Bader
- National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, MI 48824, USA; Department of Physics and Astronomy, Michigan State University, East Lansing, MI 48824, USA
- C. Bancroft
- Department of Physics, Central Michigan University, Mt. Pleasant, MI 48859, USA
- D. Barofsky
- Department of Physics, Central Michigan University, Mt. Pleasant, MI 48859, USA
- T. Baugher
- National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, MI 48824, USA; Department of Physics and Astronomy, Michigan State University, East Lansing, MI 48824, USA
- D. Bazin
- National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, MI 48824, USA
- J.S. Berryman
- National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, MI 48824, USA
- V. Bildstein
- Department of Physics, University of Guelph, Guelph, Ontario N1G 2W1, Canada
- A. Gade
- National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, MI 48824, USA; Department of Physics and Astronomy, Michigan State University, East Lansing, MI 48824, USA
- N. Imai
- Center for Nuclear Study, University of Tokyo, Wako, Saitama 351-0198, Japan
- T. Kröll
- Institut für Kernphysik, Technische Universität Darmstadt, 64289 Darmstadt, Germany
- C. Langer
- National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, MI 48824, USA
- J. Lloyd
- Department of Physics, Central Michigan University, Mt. Pleasant, MI 48859, USA
- E. Lunderberg
- National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, MI 48824, USA; Department of Physics and Astronomy, Michigan State University, East Lansing, MI 48824, USA
- F. Nowacki
- Institut Pluridisciplinaire Hubert Curien, 67037 Strasbourg, France
- G. Perdikakis
- Department of Physics, Central Michigan University, Mt. Pleasant, MI 48859, USA; National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, MI 48824, USA
- F. Recchia
- National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, MI 48824, USA
- T. Redpath
- Department of Physics, Central Michigan University, Mt. Pleasant, MI 48859, USA
- S. Saenz
- Department of Physics, Central Michigan University, Mt. Pleasant, MI 48859, USA
- D. Smalley
- National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, MI 48824, USA
- S.R. Stroberg
- National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, MI 48824, USA; Department of Physics and Astronomy, Michigan State University, East Lansing, MI 48824, USA
- Y. Utsuno
- Advanced Science Research Center, Japan Atomic Energy Agency, Tokai, Ibaraki 319-1195, Japan; Center for Nuclear Study, University of Tokyo, Wako, Saitama 351-0198, Japan
- D. Weisshaar
- National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, MI 48824, USA
- A. Westerberg
- Department of Physics, Central Michigan University, Mt. Pleasant, MI 48859, USA
- Journal volume & issue
-
Vol. 822
p. 136682
Abstract
Situated in the so-called “island of inversion,” the nucleus 32Mg is considered as an archetypal example of the disappearance of magicity at N=20. We report on high statistics in-beam spectroscopy of 32Mg with a unique approach, in that two direct reaction probes with different sensitivities to the underlying nuclear structure are employed at the same time. More specifically, states in 32Mg were populated by knockout reactions starting from 33Mg and 34Si, lying inside and outside the island of inversion, respectively. The momentum distributions of the reaction residues and the cross sections leading to the individual final states were confronted with eikonal-based reaction calculations, yielding a significantly updated level scheme for 32Mg and spin-parity assignments. By fully exploiting observables obtained in this measurement, a variety of structures coexisting in 32Mg was unraveled. Comparisons with theoretical predictions based on shell-model overlaps allowed for clear discrimination between different structural models, revealing that the complete theoretical description of this key nucleus is yet to be achieved.
