Surrogate ratio methodology for the indirect determination of neutron capture cross sections

B. L. Goldblum, S. G. Prussin, L. A. Bernstein, W. Younes, M. Guttormsen, and H. T. Nyhus
Phys. Rev. C 81, 054606 – Published 18 May 2010

Abstract

The relative γ-decay probabilities of the Dy162 to Dy161 and Dy162 to Dy164 residual nuclei, produced using light-ion-induced direct reactions, were measured as a function of excitation energy using the CACTUS array at the Oslo Cyclotron Laboratory. The external surrogate ratio method (SRM) was used to convert these relative γ-decay probabilities into the Dy161(n,γ) cross section in an equivalent neutron energy range of 130–560 keV. The directly measured Dy161(n,γ) cross section, obtained from the Evaluated Nuclear Data Files (ENDF/B-VII.0), was compared to the experimentally determined surrogate Dy161(n,γ) cross section obtained using compound-nucleus pairs with both similar (Dy162 to Dy164) and dissimilar (Dy162 to Dy161) nuclear structures. A γ-ray energy threshold was identified, based upon pairing gap parameters, that provides a first-order correction to the statistical γ-ray tagging approach and improves the agreement between the surrogate cross-section data and the evaluated result.

  • Figure
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  • Received 2 December 2009

DOI:https://doi.org/10.1103/PhysRevC.81.054606

©2010 American Physical Society

Authors & Affiliations

B. L. Goldblum* and S. G. Prussin

  • Department of Nuclear Engineering, University of California, Berkeley, California 94720, USA

L. A. Bernstein and W. Younes

  • Lawrence Livermore National Laboratory, Livermore, California 94551, USA

M. Guttormsen and H. T. Nyhus

  • Department of Physics, University of Oslo, Post Office Box 1048 Blindern, N-0316 Oslo, Norway

  • *bethany@nuc.berkeley.edu

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Issue

Vol. 81, Iss. 5 — May 2010

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