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Rotational structure of T=0 and T=1 bands in the N=Z nucleus 62Ga

Juodagalvis, Andrius LU and Åberg, Sven LU (2001) In Nuclear Physics A 683(1-4). p.207-226
Abstract

The rotational behavior of T=0 and T=1 bands in the odd-odd N=Z nucleus 62Ga is studied theoretically using the spherical shell model (laboratory frame) and the cranked Nilsson-Strutinsky model (intrinsic frame). Both models give a good description of available experimental data. The role of isoscalar and isovector pairing in the T=0 and T=1 bands as functions of angular momentum is studied in the shell model. The observed backbending in the T=0 band is interpreted as an unpaired band-crossing between two configurations with different deformation. The two configurations differ by 2p-2h and are found to terminate the rotational properties at Iπ=9+ and Iπ=17+, respectively. E2-decay... (More)

The rotational behavior of T=0 and T=1 bands in the odd-odd N=Z nucleus 62Ga is studied theoretically using the spherical shell model (laboratory frame) and the cranked Nilsson-Strutinsky model (intrinsic frame). Both models give a good description of available experimental data. The role of isoscalar and isovector pairing in the T=0 and T=1 bands as functions of angular momentum is studied in the shell model. The observed backbending in the T=0 band is interpreted as an unpaired band-crossing between two configurations with different deformation. The two configurations differ by 2p-2h and are found to terminate the rotational properties at Iπ=9+ and Iπ=17+, respectively. E2-decay matrix elements and spectroscopic quadrupole moments are calculated. From the CNS calculation, supported by shell model results, it is suggested that the low spin parts of the bands with T=0 and T=1 correspond to triaxially deformed states with the rotation taking place around the shortest axis (positive γ) and intermediate axis (negative γ), respectively. At lower spins the configuration space pf5/2g9/2, used in the shell model calculation, is found sufficient while also f7/2 becomes important above the backbending.

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author
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organization
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type
Contribution to journal
publication status
published
subject
keywords
Ga, Cranked Nilsson-Strutinsky, N=Z, Pairing energy, Quadrupole properties, Rotational bands, Shell model
in
Nuclear Physics A
volume
683
issue
1-4
pages
20 pages
publisher
Elsevier
external identifiers
  • scopus:0035952379
ISSN
0375-9474
DOI
10.1016/S0375-9474(00)00441-3
language
English
LU publication?
yes
id
811feaae-02ed-46c7-aea8-7758262c8c45
date added to LUP
2025-09-02 14:22:27
date last changed
2025-09-02 15:32:59
@article{811feaae-02ed-46c7-aea8-7758262c8c45,
  abstract     = {{<p>The rotational behavior of T=0 and T=1 bands in the odd-odd N=Z nucleus <sup>62</sup>Ga is studied theoretically using the spherical shell model (laboratory frame) and the cranked Nilsson-Strutinsky model (intrinsic frame). Both models give a good description of available experimental data. The role of isoscalar and isovector pairing in the T=0 and T=1 bands as functions of angular momentum is studied in the shell model. The observed backbending in the T=0 band is interpreted as an unpaired band-crossing between two configurations with different deformation. The two configurations differ by 2p-2h and are found to terminate the rotational properties at I<sup>π</sup>=9<sup>+</sup> and I<sup>π</sup>=17<sup>+</sup>, respectively. E2-decay matrix elements and spectroscopic quadrupole moments are calculated. From the CNS calculation, supported by shell model results, it is suggested that the low spin parts of the bands with T=0 and T=1 correspond to triaxially deformed states with the rotation taking place around the shortest axis (positive γ) and intermediate axis (negative γ), respectively. At lower spins the configuration space pf<sub>5/2</sub>g<sub>9/2</sub>, used in the shell model calculation, is found sufficient while also f<sub>7/2</sub> becomes important above the backbending.</p>}},
  author       = {{Juodagalvis, Andrius and Åberg, Sven}},
  issn         = {{0375-9474}},
  keywords     = {{Ga; Cranked Nilsson-Strutinsky; N=Z; Pairing energy; Quadrupole properties; Rotational bands; Shell model}},
  language     = {{eng}},
  month        = {{02}},
  number       = {{1-4}},
  pages        = {{207--226}},
  publisher    = {{Elsevier}},
  series       = {{Nuclear Physics A}},
  title        = {{Rotational structure of T=0 and T=1 bands in the N=Z nucleus <sup>62</sup>Ga}},
  url          = {{http://dx.doi.org/10.1016/S0375-9474(00)00441-3}},
  doi          = {{10.1016/S0375-9474(00)00441-3}},
  volume       = {{683}},
  year         = {{2001}},
}