Compound And Rotational Damping In Warm Nuclei

Journal Article · Tue Apr 05 00:00:00 EDT 2005 · AIP Conference Proceedings

DOI:https://doi.org/10.1063/1.1905328· OSTI ID:20630858

Leoni, S; Bracco, A; Benzoni, G; Blasi, N; Camera, F; Grassi, C; Million, B; Paleni, A; Pignanelli, M; Vigezzi, E; Wieland, O ^[1]; Matsuo, M ^[2]; Doessing, T; Herskind, B; Hagemann, G B; Wilson, J ^[3]; Maj, A; Kmiecik, M ^[4]; LoBianco, G; Petrache, C M ^[5] ; Perugia, INFN sez ^[6]

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1. Dipartimento di Fisica, Universita di Milano, Via Celoria 16, 20133 Milan (Italy)
2. Graduate School of Science and Technology, Niigata University, Niigata 950-2181 (Japan)
3. Niels Bohr Institute, Blegdamsvej 15-17, 2100, Copenhagen (Denmark)
4. Niewodniczanski Institute, Polish Academy of Sciences, 31-342 Cracow (Poland)
5. Dipartimento di Fisica, Universita di Camerino (Italy)
6. and others

The {gamma}-decay from excited nuclei is used to study the interplay between rotational motion and compound nucleus formation in deformed nuclei. A new analysis technique is presented which allows for the first time to directly measure the rotational and compound damping widths {gamma}rot and {gamma}{mu} from {gamma}-coincidence spectra. The method is first tested on simulated spectra and then applied to high-statistics EUROBALL data on the nucleus 163Er. Experimental values of {approx_equal}200 and 20 keV are obtained for {gamma}rot and {gamma}{mu}, respectively, in the spin region I {approx_equal} 30-40 ({Dirac_h}/2{pi}), in good agreement with microscopic cranked shell model calculations for the specific nucleus. A dependence of rotational damping on the K-quantum number of the nuclear states is also observed, both in experiment and theory, resulting in a {approx_equal}30% reduction of {gamma}rot for high-K states. This points to a delayed onset of rotational damping in high-K configurations.

• OSTI ID: 20630858
• Journal Information: AIP Conference Proceedings, Vol. 764, Issue 1; Conference: Conference on nuclei at the limits, Argonne, IL (United States), 26-30 Jul 2004; Other Information: DOI: 10.1063/1.1905328; (c) 2005 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 0094-243X
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
COINCIDENCE SPECTROMETRY
COMPOUND NUCLEI
CRANKING MODEL
DAMPING
DEFORMED NUCLEI
ENERGY SPECTRA
ENERGY-LEVEL TRANSITIONS
ERBIUM 163
GAMMA DECAY
KEV RANGE
NUCLEAR STRUCTURE
ROTATIONAL STATES
SHELL MODELS
SPIN