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Lifetime measurements and terminating structures in 87Nb

Pavan, J. ; Tabor, S. L. ; Afanasjev, A. V. ; Baktash, C. ; Cristancho, F. ; Devlin, M. ; Döring, J. ; Gross, C. J. ; Johns, G. D. and Kaye, R. A. , et al. (2003) In Physical Review C - Nuclear Physics 67(3).
Abstract

Two experiments have been performed using the 58Ni(32S,3p) reaction at 135 MeV with Gammasphere and the Microball to study the high-spin structure of the transitional nucleus 87Nb. The first experiment using a thin target provided a considerable extension and refinement of the level scheme, as well as firm spin assignments from directional correlation of oriented nuclei. Sub-picosecond lifetimes were measured in the second backed-target experiment using the Doppler-shift attenuation method. The lifetimes imply a rather modest average deformation of β2∼0.1, but with considerable variation from state to state. Strong alternations were observed in the B(M1) strengths of transitions between some... (More)

Two experiments have been performed using the 58Ni(32S,3p) reaction at 135 MeV with Gammasphere and the Microball to study the high-spin structure of the transitional nucleus 87Nb. The first experiment using a thin target provided a considerable extension and refinement of the level scheme, as well as firm spin assignments from directional correlation of oriented nuclei. Sub-picosecond lifetimes were measured in the second backed-target experiment using the Doppler-shift attenuation method. The lifetimes imply a rather modest average deformation of β2∼0.1, but with considerable variation from state to state. Strong alternations were observed in the B(M1) strengths of transitions between some pairs of bands. The experimental results were compared with calculations performed within the cranked Nilsson-Strutinsky approach. The calculations generally reproduce the irregularities in the structure of the yrast lines and plunging transition quadrupole moments Qt within the bands explaining them as reflections of configuration changes and an approach of band termination, respectively.

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type
Contribution to journal
publication status
published
subject
in
Physical Review C - Nuclear Physics
volume
67
issue
3
article number
034316
publisher
American Physical Society
external identifiers
  • scopus:0038241664
ISSN
0556-2813
language
English
LU publication?
yes
id
740294ed-2e2f-4efd-991d-f05adba89c60
date added to LUP
2024-01-19 09:29:37
date last changed
2024-01-22 14:21:03
@article{740294ed-2e2f-4efd-991d-f05adba89c60,
  abstract     = {{<p>Two experiments have been performed using the <sup>58</sup>Ni(<sup>32</sup>S,3p) reaction at 135 MeV with Gammasphere and the Microball to study the high-spin structure of the transitional nucleus <sup>87</sup>Nb. The first experiment using a thin target provided a considerable extension and refinement of the level scheme, as well as firm spin assignments from directional correlation of oriented nuclei. Sub-picosecond lifetimes were measured in the second backed-target experiment using the Doppler-shift attenuation method. The lifetimes imply a rather modest average deformation of β<sub>2</sub>∼0.1, but with considerable variation from state to state. Strong alternations were observed in the B(M1) strengths of transitions between some pairs of bands. The experimental results were compared with calculations performed within the cranked Nilsson-Strutinsky approach. The calculations generally reproduce the irregularities in the structure of the yrast lines and plunging transition quadrupole moments Q<sub>t</sub> within the bands explaining them as reflections of configuration changes and an approach of band termination, respectively.</p>}},
  author       = {{Pavan, J. and Tabor, S. L. and Afanasjev, A. V. and Baktash, C. and Cristancho, F. and Devlin, M. and Döring, J. and Gross, C. J. and Johns, G. D. and Kaye, R. A. and LaFosse, D. R. and Lee, I. Y. and Lerma, F. and Macchiavelli, A. O. and Ragnarsson, I. and Sarantites, D. G. and Solomon, G. N.}},
  issn         = {{0556-2813}},
  language     = {{eng}},
  month        = {{03}},
  number       = {{3}},
  publisher    = {{American Physical Society}},
  series       = {{Physical Review C - Nuclear Physics}},
  title        = {{Lifetime measurements and terminating structures in <sup>87</sup>Nb}},
  volume       = {{67}},
  year         = {{2003}},
}