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Lifetime measurements and terminating structures in Nb-87

Pavan, J; Tabor, SL; Afanasjev, AV; Baktash, C; Cristancho, F; Devlin, M; Doring, J; Gross, CJ; Johns, GD and Kaye, RA, et al. (2003) In Physical Review C (Nuclear Physics) 67(3: 034316).
Abstract
Two experiments have been performed using the Ni-58(S-32,3p) reaction at 135 MeV with Gammasphere and the Microball to study the high-spin structure of the transitional nucleus Nb-87. 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 beta(2)similar to0.1, 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... (More)
Two experiments have been performed using the Ni-58(S-32,3p) reaction at 135 MeV with Gammasphere and the Microball to study the high-spin structure of the transitional nucleus Nb-87. 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 beta(2)similar to0.1, 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(t) within the bands explaining them as reflections of configuration changes and an approach of band termination, respectively. (Less)
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Physical Review C (Nuclear Physics)
volume
67
issue
3: 034316
publisher
American Physical Society
external identifiers
  • wos:000182032000025
  • scopus:85039013739
ISSN
0556-2813
DOI
10.1103/PhysRevC.67.034316
language
English
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yes
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2007-09-20 09:03:57
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@article{f2178835-de06-4a11-9291-4a6cc41b9e1c,
  abstract     = {Two experiments have been performed using the Ni-58(S-32,3p) reaction at 135 MeV with Gammasphere and the Microball to study the high-spin structure of the transitional nucleus Nb-87. 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 beta(2)similar to0.1, 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(t) within the bands explaining them as reflections of configuration changes and an approach of band termination, respectively.},
  author       = {Pavan, J and Tabor, SL and Afanasjev, AV and Baktash, C and Cristancho, F and Devlin, M and Doring, J and Gross, CJ and Johns, GD and Kaye, RA and LaFosse, DR and Lee, IY and Lerma, F and Macchiavelli, AO and Ragnarsson, Ingemar and Sarantites, DG and Solomon, GN},
  issn         = {0556-2813},
  language     = {eng},
  number       = {3: 034316},
  publisher    = {American Physical Society},
  series       = {Physical Review C (Nuclear Physics)},
  title        = {Lifetime measurements and terminating structures in Nb-87},
  url          = {http://dx.doi.org/10.1103/PhysRevC.67.034316},
  volume       = {67},
  year         = {2003},
}