Is the K-quantum number conserved in the order-to-chaos transition region?
- Napolih, D.
- 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.
DOIAbstract
To study the order-to-chaos transition in nuclei we investigate the validity of the K-quantum number in the excited rapidly rotating $^{163}$Er nucleus, analyzing the variance and covariance of the spectrum fluctuations of $\gamma$-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 $20\hbar \leq I \leq 40\hbar$. At higher internal energy, from about 1.2 to 2.5 MeV, the selection rules are found to be only partially valid
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