Is the K-quantum number conserved in the order-to-chaos transition region?

To study the order-to-chaos transition in nuclei we investigate the validity of the K-quantum number in the excited rapidly rotating 163Er nucleus, analyzing the variance and covariance of the spectrum fluctuations of γ-cascades feeding into low-K and high-K bands. The data are compared to simulated...

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Bibliographic Details
Published in:Physics letters. B 2005-06, Vol.615 (3-4), p.160-166
Main Authors: Benzoni, G., Bracco, A., Leoni, S., Blasi, N., Camera, F., Grassi, C., Million, B., Paleni, A., Pignanelli, M., Vigezzi, E., Wieland, O., Matsuo, M., Døssing, T., Herskind, B., Hagemann, G.B., Wilson, J., Maj, A., Kmiecik, M., Lo Bianco, G., Petrache, C.M., Castoldi, M., Zucchiati, A., De Angelis, G., Napoli, D., Bednarczyk, P., Curien, D.
Format: Article
Language:English
Subjects:
Compound states
Exact sciences and technology
Excited rotating nuclei
K-quantum number
Nuclear Experiment
Nuclear physics
Physics
Quasi-continuum gamma spectra
Residual interaction
The physics of elementary particles and fields
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Summary:To study the order-to-chaos transition in nuclei we investigate the validity of the K-quantum number in the excited rapidly rotating 163Er nucleus, analyzing the variance and covariance of the spectrum fluctuations of γ-cascades feeding into low-K and high-K bands. The data are compared to simulated spectra obtained using a microscopic cranked shell model. K-selection rules are found to be obeyed for decay along excited unresolved rotational bands of internal excitation energy up to around 1.2 MeV and angular momenta 20ℏ⩽I⩽40ℏ. At higher internal energy, from about 1.2 to 2.5 MeV, the selection rules are found to be only partially valid.
ISSN:0370-2693
1873-2445
DOI:10.1016/j.physletb.2004.12.083