Acta Physica Polonica B

Vol. 34, No. 4, April 2003, page 2221

Study of K Selection Rules in Warm Rotating Nuclei

G. Benzoni, A. Bracco, F. Camera, S. Leoni, B. Million, O. Wieland, N. Blasi, M. Pignanelli, A. Maj, M. Kmiecik, B. Herskind, G.B. Hagemann, J. Wilson, G. Lo Bianco, C. Petrache, M. Castoldi, A. Zucchiati, G. De Angelis, D. Napoli, P. Bednarczyk, D. Curien

The problem of the conservation of the K-quantum number at high spin and high-excitation energy is investigated making use of a large statistics data set on the 163Er nucleus, obtained with the EUROBALL array. In particular, the ridge structure, observed in \gamma --\gamma coincidence matrices and typical of the rotational motion, is analysed for high and low values of the K quantum number. The experimental results are compared with cranked shell model calculations taking into account the residual interaction and for which the K-quantum number of the band can be traced also in the warm rotation.

PACS numbers: 21.10.Re, 23.20.Lv, 24.80.+y, 27.10.+q

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