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- Title
Suppression of band crossing in the neutron-rich nuclei <sup>172, 173</sup>Yb due to the absence of a static pair field.
- Authors
Venkova, Ts.; Gast, W.; Lieder, R. M.; Bazzacco, D.; de Angelis, G.; Lieder, E. O.; Pasternak, A. A.; Menegazzo, R.; Lunardi, S.; Rossi Alvarez, C.; Ur, C.; Martinez, T.; Axiotis, M.; Napoli, D.; Urban, W.; Rząca-Urban, T.; Frauendorf, S.
- Abstract
High-spin states in the neutron-rich nuclei 172,173Yb have been populated in a 170Er(7Li,(p,d,t) xn) incomplete-fusion reaction and the emitted γ-radiation was detected with the GASP array. The signature partners of the 7/2+[633] rotational band of the odd- N 173Yb isotope have been newly established and were observed up to spin values of (45/2+) and (43/2+), respectively. The ground-state band of the even-even nucleus 172Yb has been observed up to a spin value of (22+). No band crossings were found in these bands. To explain this observation, it is proposed that the static pair field is absent, considering that the neutron odd-even mass differences reach for these nuclei very small values and that the band crossing is absent in cranked shell modell calculations without pairing. The results indicate, however, that strong dynamic correlations are still present.
- Subjects
CONTROLLED fusion; PAIRING correlations (Nuclear physics); NUCLEAR reactions; NUCLEAR shell theory; PARTICLES (Nuclear physics); NUCLEAR physics; MATHEMATICAL physics
- Publication
European Physical Journal A -- Hadrons & Nuclei, 2005, Vol 26, Issue 1, p19
- ISSN
1434-6001
- Publication type
Article
- DOI
10.1140/epja/i2005-10132-1