Theoretical study of triaxial shapes of neutron-rich Mo and Ru nuclei

Zhang, C. L.; Bhat, G. H.; Nazarewicz, W.; Sheikh, J. A.; Shi, Yue

doi:10.1103/PhysRevC.92.034307

Title: Theoretical study of triaxial shapes of neutron-rich Mo and Ru nuclei

Journal Article · Thu Sep 10 00:00:00 EDT 2015 · Physical Review C, Nuclear Physics

DOI:https://doi.org/10.1103/PhysRevC.92.034307· OSTI ID:1337836

Zhang, C. L. ^[1]; Bhat, G. H. ^[2]; Nazarewicz, W. ^[3]; Sheikh, J. A. ^[2]; Shi, Yue ^[4]

Michigan State Univ., East Lansing, MI (United States); Peking Univ., Beijing (China)
Univ. of Kashmir, Srinagar (India)
Michigan State Univ., East Lansing, MI (United States); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Univ. of Warsaw, Warsaw (Poland)
Michigan State Univ., East Lansing, MI (United States)

Here, whether atomic nuclei can possess triaxial shapes at their ground states is still a subject of ongoing debate. According to theory, good prospects for low-spin triaxiality are in the neutron-rich Mo-Ru region. Recently, transition quadrupole moments in rotational bands of even-mass neutron-rich isotopes of molybdenum and ruthenium nuclei have been measured. The new data have provided a challenge for theoretical descriptions invoking stable triaxial deformations. The purpose of this study is to understand experimental data on rotational bands in the neutron-rich Mo-Ru region, we carried out theoretical analysis of moments of inertia, shapes, and transition quadrupole moments of neutron-rich even-even nuclei around ¹¹⁰Ru using self-consistent mean-field and shell model techniques. Methods: To describe yrast structures in Mo and Ru isotopes, we use nuclear density functional theory (DFT) with the optimized energy density functional UNEDF0. We also apply triaxial projected shell model (TPSM) to describe yrast and positive-parity, near-yrast band structures. As a result, our self-consistent DFT calculations predict triaxial ground-state deformations in ^106,108Mo and ^108,110,112Ru and reproduce the observed low-frequency behavior of moments of inertia. As the rotational frequency increases, a negative-gamma structure, associated with the aligned ν(h_11/2)² pair, becomes energetically favored. The computed transition quadrupole moments vary with angular momentum, which reflects deformation changes with rotation; those variations are consistent with experiment. The TPSM calculations explain the observed band structures assuming stable triaxial shapes. Lastly, the structure of neutron-rich even-even nuclei around Ru-110 is consistent with triaxial shape deformations. Our DFT and TPSM frameworks provide a consistent and complementary description of experimental data.

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Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). Oak Ridge Leadership Computing Facility (OLCF)

Sponsoring Organization:: USDOE Office of Science (SC)

Grant/Contract Number:: AC05-00OR22725; DOE-DE-SC0013365; DOE-DE-SC0008511

OSTI ID:: 1337836

Alternate ID(s):: OSTI ID: 1224607

Journal Information:: Physical Review C, Nuclear Physics, Vol. 92, Issue 3; ISSN 0556-2813

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 27 works

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