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Evolution of nuclear shapes in odd-mass yttrium and niobium isotopes from lifetime measurements following fission reactions

Hagen, T. W.; Görgen, A.; Korten, W; Grente, L.; Salsac, M. -D.; Farget, F.; Ragnarsson, I. LU ; Braunroth, T.; Bruyneel, B. and Celikovic, I., et al. (2017) In Physical Review C: covering nuclear physics 95(3).
Abstract

Lifetimes of excited states in Y99,Y101,Nb101,Nb103, and Nb105 were measured in an experiment using the recoil distance Doppler shift method at GANIL (Grand Accélérateur National d'Ions Lourds). The neutron-rich nuclei were produced in fission reactions between a U238 beam and a Be9 target. Prompt γ rays were measured with the EXOGAM array and correlated with fission fragments that were identified in mass and atomic number with the VAMOS++ spectrometer. The measured lifetimes, together with branching ratios, provide B(M1) and B(E2) values for the strongly coupled rotational bands built on the [422]5/2+ ground state in the Y and Nb nuclei with neutron number N≥60. The comparison of the experimental results with triaxial particle-rotor... (More)

Lifetimes of excited states in Y99,Y101,Nb101,Nb103, and Nb105 were measured in an experiment using the recoil distance Doppler shift method at GANIL (Grand Accélérateur National d'Ions Lourds). The neutron-rich nuclei were produced in fission reactions between a U238 beam and a Be9 target. Prompt γ rays were measured with the EXOGAM array and correlated with fission fragments that were identified in mass and atomic number with the VAMOS++ spectrometer. The measured lifetimes, together with branching ratios, provide B(M1) and B(E2) values for the strongly coupled rotational bands built on the [422]5/2+ ground state in the Y and Nb nuclei with neutron number N≥60. The comparison of the experimental results with triaxial particle-rotor calculations provides information about the evolution of the nuclear shape in this mass region.

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Physical Review C: covering nuclear physics
volume
95
issue
3
publisher
American Physical Society
external identifiers
  • scopus:85015789127
  • wos:000396019100002
ISSN
2469-9985
DOI
10.1103/PhysRevC.95.034302
language
English
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yes
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a1ab43b3-fe7a-4149-80e5-1a1d1f71eab2
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2017-04-05 14:48:57
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2018-04-08 04:55:35
@article{a1ab43b3-fe7a-4149-80e5-1a1d1f71eab2,
  abstract     = {<p>Lifetimes of excited states in Y99,Y101,Nb101,Nb103, and Nb105 were measured in an experiment using the recoil distance Doppler shift method at GANIL (Grand Accélérateur National d'Ions Lourds). The neutron-rich nuclei were produced in fission reactions between a U238 beam and a Be9 target. Prompt γ rays were measured with the EXOGAM array and correlated with fission fragments that were identified in mass and atomic number with the VAMOS++ spectrometer. The measured lifetimes, together with branching ratios, provide B(M1) and B(E2) values for the strongly coupled rotational bands built on the [422]5/2+ ground state in the Y and Nb nuclei with neutron number N≥60. The comparison of the experimental results with triaxial particle-rotor calculations provides information about the evolution of the nuclear shape in this mass region.</p>},
  articleno    = {034302},
  author       = {Hagen, T. W. and Görgen, A. and Korten, W and Grente, L. and Salsac, M. -D. and Farget, F. and Ragnarsson, I. and Braunroth, T. and Bruyneel, B. and Celikovic, I. and Clément, E. and de France, G and Delaune, O. and Dewald, A. and Dijon, A and Hackstein, M. and Jacquot, B. J and Litzinger, J. and Ljungvall, J. and Louchart, C. and Michelagnoli, C. and Napoli, D. R. and Recchia, F. and Rother, W. and Sahin, E. and Siem, S. and Sulignano, B. and Theisen, Ch. and Valiente-Dobon, J. J.},
  issn         = {2469-9985},
  language     = {eng},
  month        = {03},
  number       = {3},
  publisher    = {American Physical Society},
  series       = {	Physical Review C: covering nuclear physics},
  title        = {Evolution of nuclear shapes in odd-mass yttrium and niobium isotopes from lifetime measurements following fission reactions},
  url          = {http://dx.doi.org/10.1103/PhysRevC.95.034302},
  volume       = {95},
  year         = {2017},
}