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In-beam spectroscopy reveals competing nuclear shapes in the rare isotope 62Cr

Journal Article · · Nature Physics
 [1];  [2];  [3];  [4];  [4];  [5];  [3];  [1];  [6];  [7];  [1];  [6];  [8];  [1];  [1];  [1];  [9];  [1];  [1];  [6] more »;  [10];  [1];  [1] « less
  1. Michigan State University, East Lansing, MI (United States)
  2. Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
  3. University of North Carolina at Chapel Hill, NC (United States); Duke University, Durham, NC (United States)
  4. Université de Strasbourg (France)
  5. University of Surrey, Guildford (United Kingdom)
  6. Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
  7. Argonne National Laboratory (ANL), Argonne, IL (United States)
  8. Mississippi State University, MS (United States)
  9. Università degli Studi di Padova and INFN Sezione di Padova, Padua (Italy)
  10. Universidad Autónoma de Madrid (Spain)
+ Show Author Affiliations
In recent decades, rareisotope facilities have enabled the study of short-lived, neutron-rich nuclei. Their measured properties indicate that shell structure changes in the regime of unbalanced neutron-to-proton ratios compared to that of stable nuclei. In the so-called islands of inversion in the nuclear chart – around the neutron-rich nuclei 32Mg, 42Si and 64Cr, for example – the textbook shell-model picture predicts the presence of spherical shapes due to the respective magic neutron numbers of 20, 28, and 40 of these nuclei. However, nuclei in these regions turn out to be deformed in their ground states. Another hallmark of these islands is shape coexistence, where a nucleus assumes different shapes with excitation energy. Furthermore, we present evidence for this phenomenon from the observation of an excited 0+ state in 62Cr, two neutrons away from the heart of the island of inversion around neutron number N = 40. We use large-scale shell-model calculations to interpret the results and report extrapolations for the doubly-magic nucleus 60Ca.
Research Organization:
Duke University, Durham, NC (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Nuclear Physics (NP); USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities (SUF); USDOE Office of Science (SC), High Energy Physics (HEP); USDOE National Nuclear Security Administration (NNSA); National Science Foundation (NSF); Science and Technology Facilities Council; MCIN/AEI/10.13039/501100011033
Grant/Contract Number:
FG02-97ER41033; SC0023633; SC0023010; FG02-94ER40848; AC02-05CH11231; AC02-06CH11357; SC0022299; NA0003180; AC52-07NA27344
OSTI ID:
3003131
Alternate ID(s):
OSTI ID: 2480951
OSTI ID: 2481037
OSTI ID: 2504637
OSTI ID: 2504595
OSTI ID: 2573771
OSTI ID: 3001477
Journal Information:
Nature Physics, Journal Name: Nature Physics Journal Issue: 1 Vol. 21; ISSN 1745-2473; ISSN 1745-2481
Publisher:
Springer Science and Business Media LLCCopyright Statement
Country of Publication:
United States
Language:
English

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