High-spin states in {sup 156}Yb and structure evolutions at large angular momenta in even-A Yb isotopes

High-spin states of {sup 156}Yb have been studied via the {sup 144}Sm({sup 16}O,4n){sup 156}Yb fusion-evaporation reaction at beam energy 102 MeV. The positive-parity yrast band and negative-parity cascade have been extended up to higher-spin states, respectively. In the present work, the negative-p...

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Veröffentlicht in:Physical review. C, Nuclear physics Nuclear physics, 2008-06, Vol.77 (6)
Hauptverfasser: Li, Z. Y., Hua, H., Wang, S. Y., Meng, J., Li, Z. H., Li, X. Q., Xu, F. R., Liu, H. L., Zhang, S. Q., Ye, Y. L., Jiang, D. X., Zheng, T., Ma, L. Y., Lu, F., Fan, F. Y., Han, L. Y., Wang, H., Xiao, J., Chen, D., Fang, X., Institute of Theoretical Physics, Chinese Academy of Sciences, Beijing 100080, Center of Theoretical Nuclear Physics, National Laboratory of Heavy Ion Accelerator, Lanzhou 730000, China Institute of Atomic Energy, Beijing 102413
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Sprache:eng
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Zusammenfassung:High-spin states of {sup 156}Yb have been studied via the {sup 144}Sm({sup 16}O,4n){sup 156}Yb fusion-evaporation reaction at beam energy 102 MeV. The positive-parity yrast band and negative-parity cascade have been extended up to higher-spin states, respectively. In the present work, the negative-parity sequence above the 25{sup -} state was found to be irregular and fragment into many parallel branches. This pattern may related to the excitation from the nucleon in the Z=64,N=82 core. The characteristics of alignment plot and E-GOS curve for the positive-parity yrast sequence in {sup 156}Yb indicate that this nucleus may undergo an evolution from quasivibrational to quasirotational structure with increasing angular momentum. Based on a systematic summary of the available experimental alignments for the even-A {sup 156,158,160,162,164}Yb isotopes, the structural evolutions induced by the increase in angular momentum, as well as by the change in neutron numbers, in these even-A Yb isotopes have been discussed in comparison with the cranked Woods-Saxon-Strutinsky calculations by means of total-Routhian-surface (TRS) methods.
ISSN:0556-2813
1089-490X
DOI:10.1103/PHYSREVC.77.064323