Sensitivity of neutron observables to the model input in simulations of 252Cf(sf)

J. Randrup, P. Talou, and R. Vogt
Phys. Rev. C 99, 054619 – Published 22 May 2019

Abstract

Within the framework of FREYA event-by-event fission simulations, we study the sensitivity of various neutron observables to the input yield function Y(A,Z,TKE) on which the fission event sampling is based. We first perform a statistical analysis of the available fission data in order to determine the distribution of possible yield functions Y(A,Z,TKE) and we then construct a sample of 15 000 such yield functions. For each of these, FREYA is used to generate one million fission events, leading to a corresponding ensemble of fission observables, including the neutron multiplicity distribution and its factorial moments, the neutron energy spectrum, and the neutron-neutron angular correlation. This procedure allows us to study the sensitivity of those neutron observables to the uncertainty in the experimental data. Particular attention is given to the pronounced anticorrelation between the mean neutron multiplicity ν¯ and the mean total fragment kinetic energy TKE¯. Because the former observable is very well determined experimentally, it is possible to exploit that inherent anticorrelation to derive a significantly stricter tolerance on TKE¯. In addition, we study the sensitivity to the various FREYA parameters and we introduce a method for determining a A-dependent x parameter, x(A), based on the measured A-dependent neutron multiplicity, ν¯(A).

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  • Received 15 February 2019

DOI:https://doi.org/10.1103/PhysRevC.99.054619

©2019 American Physical Society

Physics Subject Headings (PhySH)

Nuclear Physics

Authors & Affiliations

J. Randrup1,2, P. Talou3, and R. Vogt4,5

  • 1Nuclear Science Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
  • 2Nuclear Engineering Department, University of California, Berkeley, California 94720, USA
  • 3Nuclear Theory Group and X-Computational Physics Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA
  • 4Physics Division, Lawrence Livermore National Laboratory, Livermore, California 94551, USA
  • 5Physics Department, University of California, Davis, California 95616, USA

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Issue

Vol. 99, Iss. 5 — May 2019

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