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High-spin structure of normal-deformed bands in 84Zr

Cardona, R. ; Cristancho, F. ; Tabor, S. L. ; Kaye, R. A. ; Solomon, G. Z. ; Döring, J. ; Johns, G. D. ; Devlin, M. ; Lerma, F. and Sarantites, D. G. , et al. (2003) In Physical Review C - Nuclear Physics 68(2). p.243031-2430312
Abstract

The reaction 58Ni(32S, α2p) at E lab= 135 MeV was used to populate high-spin states in 84Zr. The complete GAMMASPHERE and MICROBALL arrays were used to obtain clean γ- γ- γ line shapes to be analyzed by the Doppler shift attenuation method and to determine 27 lifetimes in the ground-state band and in two excited bands. Side-feeding times were also measured by comparing the line shapes gated with transitions above and below the state under study. The deduced electric quadrupole moments for the ground-state band are consistent with a very slow reduction with frequency with values ranging between 2.4(3) and 2.0(1)e b. The negative-parity bands feature also an approximate constancy of quadrupole... (More)

The reaction 58Ni(32S, α2p) at E lab= 135 MeV was used to populate high-spin states in 84Zr. The complete GAMMASPHERE and MICROBALL arrays were used to obtain clean γ- γ- γ line shapes to be analyzed by the Doppler shift attenuation method and to determine 27 lifetimes in the ground-state band and in two excited bands. Side-feeding times were also measured by comparing the line shapes gated with transitions above and below the state under study. The deduced electric quadrupole moments for the ground-state band are consistent with a very slow reduction with frequency with values ranging between 2.4(3) and 2.0(1)e b. The negative-parity bands feature also an approximate constancy of quadrupole moment with values similar to those in the ground-state band. Cranking calculations agree with this behavior in both parity bands and suggest an interpretation of the upper states in the ground-state band as part of a very slowly terminating band. Shell-dependent cranked Nilsson calculations explain a fourth γ cascade as pertaining to a noncollective structure terminating at I = 20+.

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publishing date
type
Contribution to journal
publication status
published
subject
in
Physical Review C - Nuclear Physics
volume
68
issue
2
article number
024303
pages
243031 - 2430312
publisher
American Physical Society
external identifiers
  • scopus:0141987753
ISSN
0556-2813
language
English
LU publication?
yes
id
0f85422b-593b-4c86-bfec-d64944b4383e
date added to LUP
2023-12-27 13:06:00
date last changed
2023-12-27 13:06:53
@article{0f85422b-593b-4c86-bfec-d64944b4383e,
  abstract     = {{<p>The reaction <sup>58</sup>Ni(<sup>32</sup>S, α2p) at E <sub>lab</sub>= 135 MeV was used to populate high-spin states in <sup>84</sup>Zr. The complete GAMMASPHERE and MICROBALL arrays were used to obtain clean γ- γ- γ line shapes to be analyzed by the Doppler shift attenuation method and to determine 27 lifetimes in the ground-state band and in two excited bands. Side-feeding times were also measured by comparing the line shapes gated with transitions above and below the state under study. The deduced electric quadrupole moments for the ground-state band are consistent with a very slow reduction with frequency with values ranging between 2.4(3) and 2.0(1)e b. The negative-parity bands feature also an approximate constancy of quadrupole moment with values similar to those in the ground-state band. Cranking calculations agree with this behavior in both parity bands and suggest an interpretation of the upper states in the ground-state band as part of a very slowly terminating band. Shell-dependent cranked Nilsson calculations explain a fourth γ cascade as pertaining to a noncollective structure terminating at I = 20<sup>+</sup>.</p>}},
  author       = {{Cardona, R. and Cristancho, F. and Tabor, S. L. and Kaye, R. A. and Solomon, G. Z. and Döring, J. and Johns, G. D. and Devlin, M. and Lerma, F. and Sarantites, D. G. and Lee, I. Y. and Macchiavelli, A. O. and Ragnarsson, I.}},
  issn         = {{0556-2813}},
  language     = {{eng}},
  number       = {{2}},
  pages        = {{243031--2430312}},
  publisher    = {{American Physical Society}},
  series       = {{Physical Review C - Nuclear Physics}},
  title        = {{High-spin structure of normal-deformed bands in <sup>84</sup>Zr}},
  volume       = {{68}},
  year         = {{2003}},
}