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

Title: Breaking of axial symmetry in excited heavy nuclei as identified in giant dipole resonance data

Abstract

Here, a recent theoretical prediction of a breaking of axial symmetry in quasi all heavy nuclei is confronted to a new critical analysis of photon strength functions of nuclei in the valley of stability. For the photon strength in the isovector giant dipole resonance (IVGDR) regime a parameterization of GDR shapes by the sum of three Lorentzians (TLO) is extrapolated to energies below and above the IVGDR. The impact of non-GDR modes adding to the low energy slope of photon strength is discussed including recent data on photon scattering and other radiative processes. These are shown to be concentrated in energy regions where various model calculations predict intermediate collective strength; thus they are obviously separate from the IVGDR tail. The triple Lorentzian (TLO) ansatz for giant dipole resonances is normalized in accordance to the dipole sum rule. The nuclear droplet model with surface dissipation accounts well for positions and widths without local, nuclide specific, parameters. Very few and only global parameters are needed when a breaking of axial symmetry already in the valley of stability is admitted and hence a reliable prediction for electric dipole strength functions also outside of it is expected.

Authors:
 [1];  [2]; ORCiD logo [3]
  1. Dresden Univ. of Technology (Germany). Inst. of Nuclear and Particle Physics
  2. Helmholtz-Zentrum Dresden-Rossendorf (HZDR), Dresden (Germany). Inst. of Radiation Physics
  3. Dresden Univ. of Technology (Germany). Inst. of Nuclear and Particle Physics; Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Publication Date:
Research Org.:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org.:
USDOE; German Federal Ministry of Education and Research (BMBF); European Commission (EC)
OSTI Identifier:
1441329
Report Number(s):
LA-UR-18-20147
Journal ID: ISSN 1434-6001
Grant/Contract Number:
AC52-06NA25396; 02NUK13A; FP7-269499; 605203
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
European Physical Journal. A
Additional Journal Information:
Journal Volume: 53; Journal Issue: 11; Journal ID: ISSN 1434-6001
Publisher:
Springer
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS; Nuclear symmetry; giant dipole resonance; nuclear deformation

Citation Formats

Grosse, E., Junghans, A. R., and Massarczyk, R. Breaking of axial symmetry in excited heavy nuclei as identified in giant dipole resonance data. United States: N. p., 2017. Web. doi:10.1140/epja/i2017-12415-2.
Grosse, E., Junghans, A. R., & Massarczyk, R. Breaking of axial symmetry in excited heavy nuclei as identified in giant dipole resonance data. United States. doi:10.1140/epja/i2017-12415-2.
Grosse, E., Junghans, A. R., and Massarczyk, R. Tue . "Breaking of axial symmetry in excited heavy nuclei as identified in giant dipole resonance data". United States. doi:10.1140/epja/i2017-12415-2.
@article{osti_1441329,
title = {Breaking of axial symmetry in excited heavy nuclei as identified in giant dipole resonance data},
author = {Grosse, E. and Junghans, A. R. and Massarczyk, R.},
abstractNote = {Here, a recent theoretical prediction of a breaking of axial symmetry in quasi all heavy nuclei is confronted to a new critical analysis of photon strength functions of nuclei in the valley of stability. For the photon strength in the isovector giant dipole resonance (IVGDR) regime a parameterization of GDR shapes by the sum of three Lorentzians (TLO) is extrapolated to energies below and above the IVGDR. The impact of non-GDR modes adding to the low energy slope of photon strength is discussed including recent data on photon scattering and other radiative processes. These are shown to be concentrated in energy regions where various model calculations predict intermediate collective strength; thus they are obviously separate from the IVGDR tail. The triple Lorentzian (TLO) ansatz for giant dipole resonances is normalized in accordance to the dipole sum rule. The nuclear droplet model with surface dissipation accounts well for positions and widths without local, nuclide specific, parameters. Very few and only global parameters are needed when a breaking of axial symmetry already in the valley of stability is admitted and hence a reliable prediction for electric dipole strength functions also outside of it is expected.},
doi = {10.1140/epja/i2017-12415-2},
journal = {European Physical Journal. A},
number = 11,
volume = 53,
place = {United States},
year = {Tue Nov 28 00:00:00 EST 2017},
month = {Tue Nov 28 00:00:00 EST 2017}
}

Journal Article:
Free Publicly Available Full Text
This content will become publicly available on November 28, 2018
Publisher's Version of Record

Save / Share: