Rotational band structure in
- Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Nuclear Science Division; Ohio Univ., Athens, OH (United States). Institute for Nuclear and Particle Physics and Department of Physics and Astronomy
- Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Nuclear Science Division
- Universidad Autonoma de Madrid (Spain). Departamento de Fisica Teorica and IFT-UAM/CSIC
- Michigan State Univ., East Lansing, MI (United States). National Superconducting Cyclotron Laboratory and Department of Physics and Astronomy
- Michigan State Univ., East Lansing, MI (United States). National Superconducting Cyclotron Laboratory
- Argonne National Lab. (ANL), Argonne, IL (United States). Physics Division
- Osaka University (Japan). RCNP
- Ohio Univ., Athens, OH (United States). Institute for Nuclear and Particle Physics and Department of Physics and Astronomy
- The University of Tokyo (Japan). Department of Physic
There is significant evidence supporting the existence of deformed ground states within the neutron-rich N ≈ 20 neon, sodium, and magnesium isotopes that make up what is commonly called the “island of inversion.” However, the rotational band structures, which are a characteristic fingerprint of a rigid nonspherical shape, have yet to be observed. Here, in this work, we report on a measurement and analysis of the yrast (lowest lying) rotational band in 32Mg up to spin I = 6+ produced in a two-step projectile fragmentation reaction and observed using the state-of-the-art γ-ray tracking detector array, GRETINA (γ-ray energy tracking in-beam nuclear array). Large-scale shell-model calculations using the SDPF-U-MIX effective interaction show excellent agreement with the new data. Finally, a theoretical analysis of the spectrum of rotational states as a function of the pairing gap, together with cranked-shell-model calculations, provides intriguing evidence for a reduction in pairing correlations with increased angular momentum, also in line with the shell-model results.
- Research Organization:
- Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
- Sponsoring Organization:
- USDOE National Nuclear Security Administration (NNSA); USDOE Office of Science (SC), Nuclear Physics (NP)
- Grant/Contract Number:
- AC02-05CH11231; AC02-06CH11357; NA0000979
- OSTI ID:
- 1379245
- Alternate ID(s):
- OSTI ID: 1243003
- Journal Information:
- Physical Review C, Vol. 93, Issue 3; ISSN 2469-9985
- Publisher:
- American Physical Society (APS)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
Web of Science
Ab initio description of collectivity for sd shell nuclei
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journal | April 2019 |
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