skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Compound And Rotational Damping In Warm Nuclei

Abstract

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.

Authors:
; ; ; ; ; ; ; ; ; ;  [1];  [2]; ; ; ;  [3]; ;  [4]; ;  [5] more »;  [6] « less
  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
Publication Date:
OSTI Identifier:
20630858
Resource Type:
Journal Article
Journal Name:
AIP Conference Proceedings
Additional Journal Information:
Journal Volume: 764; Journal 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); Journal ID: ISSN 0094-243X
Country of Publication:
United States
Language:
English
Subject:
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

Citation Formats

Leoni, S, Bracco, A, Benzoni, G, Blasi, N, Camera, F, Grassi, C, Million, B, Paleni, A, Pignanelli, M, Vigezzi, E, Wieland, O, INFN Sez. Milano, Via Celoria 16, 20133 Milan, Matsuo, M, Doessing, T, Herskind, B, Hagemann, G B, Wilson, J, Maj, A, Kmiecik, M, LoBianco, G, Petrache, C M, and Perugia, INFN sez. Compound And Rotational Damping In Warm Nuclei. United States: N. p., 2005. Web. doi:10.1063/1.1905328.
Leoni, S, Bracco, A, Benzoni, G, Blasi, N, Camera, F, Grassi, C, Million, B, Paleni, A, Pignanelli, M, Vigezzi, E, Wieland, O, INFN Sez. Milano, Via Celoria 16, 20133 Milan, Matsuo, M, Doessing, T, Herskind, B, Hagemann, G B, Wilson, J, Maj, A, Kmiecik, M, LoBianco, G, Petrache, C M, & Perugia, INFN sez. Compound And Rotational Damping In Warm Nuclei. United States. https://doi.org/10.1063/1.1905328
Leoni, S, Bracco, A, Benzoni, G, Blasi, N, Camera, F, Grassi, C, Million, B, Paleni, A, Pignanelli, M, Vigezzi, E, Wieland, O, INFN Sez. Milano, Via Celoria 16, 20133 Milan, Matsuo, M, Doessing, T, Herskind, B, Hagemann, G B, Wilson, J, Maj, A, Kmiecik, M, LoBianco, G, Petrache, C M, and Perugia, INFN sez. 2005. "Compound And Rotational Damping In Warm Nuclei". United States. https://doi.org/10.1063/1.1905328.
@article{osti_20630858,
title = {Compound And Rotational Damping In Warm Nuclei},
author = {Leoni, S and Bracco, A and Benzoni, G and Blasi, N and Camera, F and Grassi, C and Million, B and Paleni, A and Pignanelli, M and Vigezzi, E and Wieland, O and INFN Sez. Milano, Via Celoria 16, 20133 Milan and Matsuo, M and Doessing, T and Herskind, B and Hagemann, G B and Wilson, J and Maj, A and Kmiecik, M and LoBianco, G and Petrache, C M and Perugia, INFN sez},
abstractNote = {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.},
doi = {10.1063/1.1905328},
url = {https://www.osti.gov/biblio/20630858}, journal = {AIP Conference Proceedings},
issn = {0094-243X},
number = 1,
volume = 764,
place = {United States},
year = {Tue Apr 05 00:00:00 EDT 2005},
month = {Tue Apr 05 00:00:00 EDT 2005}
}