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.
- Braunroth, T.
- Bruyneel, B.
- Celikovic, I.
- Clément, E.
- de France, G
- Delaune, O.
- Dewald, A.
- Dijon, A
- Hackstein, M.
- Jacquot, B. J
- Litzinger, J.
- Ljungvall, J.
- Louchart, C.
- Michelagnoli, C.
- Napoli, D. R.
- Recchia, F.
- Rother, W.
- Sahin, E.
- Siem, S.
- Sulignano, B.
- Theisen, Ch.
- Valiente-Dobon, J. J.
DOIAbstract
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 calcul...
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