Rotational band structure in Mg32

Crawford, H. L.; Fallon, P.; Macchiavelli, A. O.; Poves, A.; Bader, V. M.; Bazin, D.; Bowry, M.; Campbell, C. M.; Carpenter, M. P.; Clark, R. M.; Cromaz, M.; Gade, A.; Ideguchi, E.; Iwasaki, H.; Langer, C.; Lee, I. Y.; Loelius, C.; Lunderberg, E.; Morse, C.; Richard, A. L.; Rissanen, J.; Smalley, D.; Stroberg, S. R.; Weisshaar, D.; Whitmore, K.; Wiens, A.; Williams, S. J.; Wimmer, K.; Yamamato, T.

doi:10.1103/PhysRevC.93.031303

Title: Rotational band structure in ${}^{32}{Mg}$

Journal Article · Wed Mar 23 00:00:00 EDT 2016 · Physical Review C

DOI:https://doi.org/10.1103/PhysRevC.93.031303· OSTI ID:1379245

Crawford, H. L. ^[1]; Fallon, P. ^[2]; Macchiavelli, A. O. ^[2]; Poves, A. ^[3]; Bader, V. M. ^[4]; Bazin, D. ^[5]; Bowry, M. ^[5]; Campbell, C. M. ^[2]; Carpenter, M. P. ^[6]; Clark, R. M. ^[2]; Cromaz, M. ^[2]; Gade, A. ^[4]; Ideguchi, E. ^[7]; Iwasaki, H. ^[4]; Langer, C. ^[5]; Lee, I. Y. ^[2]; Loelius, C. ^[4]; Lunderberg, E. ^[4]; Morse, C. ^[4]; Richard, A. L. ^[8] more »

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.

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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

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Cited by: 18 works

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