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beta(-)-delayed spectroscopy of neutron-rich tantalum nuclei: Shape evolution in neutron-rich tungsten isotopes

Alkhomashi, N.; Regan, P. H.; Podolyak, Zs.; Pietri, S.; Garnsworthy, A. B.; Steer, S. J.; Benlliure, J.; Caserejos, E.; Casten, R. F. and Gerl, J., et al. (2009) In Physical Review C (Nuclear Physics) 80(6).
Abstract
The low-lying structure of W-188,W-190,W-192 has been studied following beta decays of the neutron-rich mother nuclei Ta-188,Ta-190,Ta-192 produced following the projectile fragmentation of a 1-GeV-per-nucleon Pb-208 primary beam on a natural beryllium target at the GSI Fragment Separator. The beta-decay half-lives of Ta-188, Ta-190, and Ta-192 have been measured, with gamma-ray decays of low-lying states in their respective W daughter nuclei, using heavy-ion beta-gamma correlations and a position-sensitive silicon detector setup. The data provide information on the low-lying excited states in W-188, W-190, and W-192, which highlight a change in nuclear shape at W-190 compared with that of lighter W isotopes. This evolution of ground-state... (More)
The low-lying structure of W-188,W-190,W-192 has been studied following beta decays of the neutron-rich mother nuclei Ta-188,Ta-190,Ta-192 produced following the projectile fragmentation of a 1-GeV-per-nucleon Pb-208 primary beam on a natural beryllium target at the GSI Fragment Separator. The beta-decay half-lives of Ta-188, Ta-190, and Ta-192 have been measured, with gamma-ray decays of low-lying states in their respective W daughter nuclei, using heavy-ion beta-gamma correlations and a position-sensitive silicon detector setup. The data provide information on the low-lying excited states in W-188, W-190, and W-192, which highlight a change in nuclear shape at W-190 compared with that of lighter W isotopes. This evolution of ground-state structure along the W isotopic chain is discussed as evidence for a possible proton subshell effect for the A similar to 190 region and is consistent with maximization of the gamma-softness of the nuclear potential around N similar to 116. (Less)
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Physical Review C (Nuclear Physics)
volume
80
issue
6
publisher
American Physical Society
external identifiers
  • wos:000273232700018
  • scopus:73649102812
ISSN
0556-2813
DOI
10.1103/PhysRevC.80.064308
language
English
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yes
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54947fbb-e95a-4a51-a9fd-7c24ca89a390 (old id 1531451)
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2010-01-28 10:59:12
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@article{54947fbb-e95a-4a51-a9fd-7c24ca89a390,
  abstract     = {The low-lying structure of W-188,W-190,W-192 has been studied following beta decays of the neutron-rich mother nuclei Ta-188,Ta-190,Ta-192 produced following the projectile fragmentation of a 1-GeV-per-nucleon Pb-208 primary beam on a natural beryllium target at the GSI Fragment Separator. The beta-decay half-lives of Ta-188, Ta-190, and Ta-192 have been measured, with gamma-ray decays of low-lying states in their respective W daughter nuclei, using heavy-ion beta-gamma correlations and a position-sensitive silicon detector setup. The data provide information on the low-lying excited states in W-188, W-190, and W-192, which highlight a change in nuclear shape at W-190 compared with that of lighter W isotopes. This evolution of ground-state structure along the W isotopic chain is discussed as evidence for a possible proton subshell effect for the A similar to 190 region and is consistent with maximization of the gamma-softness of the nuclear potential around N similar to 116.},
  author       = {Alkhomashi, N. and Regan, P. H. and Podolyak, Zs. and Pietri, S. and Garnsworthy, A. B. and Steer, S. J. and Benlliure, J. and Caserejos, E. and Casten, R. F. and Gerl, J. and Wollersheim, H. J. and Grebosz, J. and Farrelly, G. and Gorska, M. and Kojouharov, I. and Schaffner, H. and Algora, A. and Benzoni, G. and Blazhev, A. and Boutachkov, P. and Bruce, A. M. and Bacelar, A. M. Denis and Cullen, I. J. and Caceres, L. and Doornenbal, P. and Estevez, M. E. and Fujita, Y. and Gelletly, W. and Hoischen, Robert and Kumar, R. and Kurz, N. and Lalkovski, S. and Liu, Z. and Mihai, C. and Molina, F. and Morales, A. I. and Muecher, D. and Prokopowicz, W. and Rubio, B. and Shi, Y. and Tamii, A. and Tashenov, S. and Valiente-Dobon, J. J. and Walker, P. M. and Woods, P. J. and Xu, F. R.},
  issn         = {0556-2813},
  language     = {eng},
  number       = {6},
  publisher    = {American Physical Society},
  series       = {Physical Review C (Nuclear Physics)},
  title        = {beta(-)-delayed spectroscopy of neutron-rich tantalum nuclei: Shape evolution in neutron-rich tungsten isotopes},
  url          = {http://dx.doi.org/10.1103/PhysRevC.80.064308},
  volume       = {80},
  year         = {2009},
}