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Coexisting normal and intruder configurations in 32Mg

Journal Article · · Physics Letters. B
 [1];  [2];  [3];  [4];  [5];  [6];  [7];  [7];  [6];  [6];  [6];  [8];  [6];  [4];  [9];  [6];  [7];  [6];  [10];  [11] more »;  [6];  [7];  [7];  [6];  [6];  [12];  [6];  [7] « less
  1. Univ. of Tokyo, Saitama (Japan); Univ. of Tennessee, Knoxville, TN (United States); Michigan State University
  2. CSIC, Madrid (Spain); Univ. of Tokyo (Japan); Central Michigan Univ., Mount Pleasant, MI (United States); Michigan State Univ., East Lansing, MI (United States)
  3. Univ. Autónoma de Madrid (Spain)
  4. Univ. of Tokyo, Saitama (Japan)
  5. Univ. of Surrey, Guildford (United Kingdom)
  6. Michigan State Univ., East Lansing, MI (United States)
  7. Central Michigan Univ., Mount Pleasant, MI (United States)
  8. Univ. of Guelph, ON (Canada)
  9. Technische Univ. Darmstadt (Germany)
  10. Inst. Pluridisciplinaire Hubert Curien, Strasbourg (France)
  11. Central Michigan Univ., Mount Pleasant, MI (United States); Michigan State Univ., East Lansing, MI (United States)
  12. Japan Atomic Energy Agency (JAEA), Ibaraki (Japan); Univ. of Tokyo, Saitama (Japan)
+ Show Author Affiliations
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.
Research Organization:
Michigan State Univ., East Lansing, MI (United States)
Sponsoring Organization:
National Science Foundation (NSF); USDOE Office of Science (SC), Nuclear Physics (NP)
Grant/Contract Number:
AC02-05CH11231; SC0020451
OSTI ID:
1824788
Journal Information:
Physics Letters. B, Journal Name: Physics Letters. B Vol. 822; ISSN 0370-2693
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

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Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
Direct reactions
In-beam γ-ray spectroscopy
Island of inversion
Radioactive beams
Shell model