Examination of photon strength functions for Dy162,164 from radiative capture of resonance neutrons

S. Valenta, B. Baramsai, T. A. Bredeweg, A. Couture, A. Chyzh, M. Jandel, J. Kroll, M. Krtička, G. E. Mitchell, J. M. O'Donnell, G. Rusev, J. L. Ullmann, and C. L. Walker
Phys. Rev. C 96, 054315 – Published 17 November 2017

Abstract

The γ rays following radiative neutron capture on Dy161,163 targets were measured with the highly segmented γ-ray calorimeter Detector for Advanced Neutron Capture Experiments at the Los Alamos Neutron Science Center. The γ-ray energy spectra for different multiplicities were gathered for tens of s-wave resonances of both possible spins in each nucleus. Analysis of these spectra within the statistical model enabled us to draw conclusions about dipole photon strength functions with emphasis on the scissors mode. The photon strength functions best describing Dy data are very similar to previously published results on even-even Gd isotopes. It was shown that the scissors mode plays a significant role in the decay of highly excited states up to the neutron separation energy. Measurement of multiple resonances allowed us to assess the fluctuations of experimental spectra and to compare the fluctuations with simulated ones. The size of measured fluctuations is on average smaller than predicted from simulations. However, the results are puzzling as the difference between simulations within the statistical model and experiment is not consistent for both nuclei.

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  • Received 3 August 2017

DOI:https://doi.org/10.1103/PhysRevC.96.054315

©2017 American Physical Society

Physics Subject Headings (PhySH)

Nuclear Physics

Authors & Affiliations

S. Valenta1,*, B. Baramsai2,†, T. A. Bredeweg3, A. Couture3, A. Chyzh2, M. Jandel3,‡, J. Kroll1,§, M. Krtička1, G. E. Mitchell2, J. M. O'Donnell3, G. Rusev3, J. L. Ullmann3, and C. L. Walker2,3

  • 1Institute of Particle and Nuclear Physics, Faculty of Mathematics and Physics, Charles University, CZ-180 00 Prague 8, Czech Republic
  • 2Department of Physics, North Carolina State University, Raleigh, North Carolina 27695, USA and Triangle Universities Nuclear Laboratory, Durham, North Carolina 27708, USA
  • 3Los Alamos National Laboratory, P.O. Box 1663, Los Alamos, New Mexico 87545, USA

  • *valenta@ipnp.troja.mff.cuni.cz
  • Present address: Vantage Partners, NASA Glenn Research Center, Brook Park, OH 44142, USA.
  • Present address: Department of Physics and Applied Physics, University of Massachusetts Lowell, Lowell, MA 01854, USA.
  • §Present address: Institute of Physics, Academy of Sciences of the Czech Republic, Prague, Czech Republic.

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Issue

Vol. 96, Iss. 5 — November 2017

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