New insights into backbending in the symmetry-adapted shell-model framework

Heller, Nicholas D.; Sargsyan, Grigor H.; Launey, Kristina D.; Johnson, Calvin W.; Dytrych, Tomáš; Draayer, Jerry P.

doi:10.1103/PhysRevC.108.024304

New insights into backbending in the symmetry-adapted shell-model framework

Journal Article · Tue Aug 08 00:00:00 EDT 2023 · Physical Review. C

DOI:https://doi.org/10.1103/PhysRevC.108.024304· OSTI ID:2948436

Heller, Nicholas D. ^[1]; Sargsyan, Grigor H. ^[2]; Launey, Kristina D. ^[3]; ^[4]; Dytrych, Tomáš ^[5]; ^[3]

Harvey Mudd College, Claremont, CA (United States)
Louisiana State University, Baton Rouge, LA (United States); Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
San Diego State University, CA (United States)
Nuclear Physics Institute of the Czech Academy of Sciences, Řež (Czech Republic)
Louisiana State University, Baton Rouge, LA (United States); San Diego State University, CA (United States)

Here we provide insights into the backbending phenomenon within the symmetry-adapted framework which naturally describes the intrinsic deformation of atomic nuclei. For ²⁰Ne, the canonical example of backbending in light nuclei, the ab initio symmetry-adapted no-core shell model shows that while the energy spectrum replicates the backbending from experimental energies under the rotor-model assumption, there is no change in the intrinsic deformation or intrinsic spin of the yrast band around the backbend. For the traditional example of ⁴⁸Cr, computed in the valence shell with empirical interactions, we confirm a high-spin nucleus that is effectively near-spherical, in agreement with previous models. However, we find that this spherical distribution results, on average, from an almost equal mixing of deformed prolate shapes with deformed oblate shapes. Microscopic calculations confirm the importance of spin alignment and configuration mixing, but surprisingly unveil no anomalous increase in moment of inertia. Furthermore, this finding opens the path toward further understanding the rotational behavior and moment of inertia of medium-mass nuclei.

View Accepted Manuscript (DOE)

Research Organization:: Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States); Louisiana State Univ., Baton Rouge, LA (United States); Louisiana State University, Baton Rouge, LA (United States)

Sponsoring Organization:: Czech Science Foundation; National Science Foundation (NSF); U.S. National Science Foundation; USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities (SUF); USDOE Office of Science (SC), Nuclear Physics (NP)

Grant/Contract Number:: AC02-05CH11231; AC52-07NA27344; FG02-03ER41272; SC0023532

OSTI ID:: 2948436

Alternate ID(s):: OSTI ID: 2345935

Journal Information:: Physical Review. C, Journal Name: Physical Review. C Journal Issue: 2 Vol. 108; ISSN 2469-9985; ISSN 2469-9993

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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