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Title: Using the MCNP6.2 Correlated Fission Multiplicity Models, CGMF and FREYA

ORCiD logo [1];  [1]
  1. Los Alamos National Laboratory
Publication Date:
Research Org.:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
Report Number(s):
DOE Contract Number:
Resource Type:
Resource Relation:
Conference: 2017 American Nuclear Society Annual Meeting ; 2017-06-11 - 2017-06-15 ; San Francisco, California, United States
Country of Publication:
United States

Citation Formats

Rising, Michael Evan, and Sood, Avneet. Using the MCNP6.2 Correlated Fission Multiplicity Models, CGMF and FREYA. United States: N. p., 2017. Web.
Rising, Michael Evan, & Sood, Avneet. Using the MCNP6.2 Correlated Fission Multiplicity Models, CGMF and FREYA. United States.
Rising, Michael Evan, and Sood, Avneet. 2017. "Using the MCNP6.2 Correlated Fission Multiplicity Models, CGMF and FREYA". United States. doi:.
title = {Using the MCNP6.2 Correlated Fission Multiplicity Models, CGMF and FREYA},
author = {Rising, Michael Evan and Sood, Avneet},
abstractNote = {},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = 2017,
month = 6

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  • We are studying the gamma ray and neutron multiplicity of various fission processes, beginning with the spontaneous fission of {sup 252}Cf, for a variety of basic and applied science purposes. The Livermore-Berkeley Array for Collaborative Experiments (LiBerACE) consists of six high-purity germanium Clover detectors (HPGe) each enclosed by an array of 16 bismuth-germanate (BGO) detectors. These detectors were arranged in a cubic pattern around a 1 {micro}Ci {sup 252}Cf source to attempt to cover as much solid angle of gamma ray emission as possible with a high level of segmentation. The single-gamma detector response function is determined at several energiesmore » by tagging in a HPGe detector on the photopeak of one of two gamma rays in two-gamma ray calibration sources and observing the multiplicity of the remainder of the array. Summing these single-gamma responses in groups yields the response function of the array to higher multiplicity events, which are convolved with multiplicity distributions from theoretical models and compared to the measured results to test the models validity.« less
  • At the present time, the new and updated fission event generators included in MCNP6.2 have been verified to be functioning properly through a variety of detailed tests. This work describes the detailed verification steps taken to ensure these complicated fission event generators, FREYA and CGMF, are integrated into MCNP6 properly. Ultimately, with the knowledge that MCNP6 is making use of these models appropriately, we can now begin to validate the models against benchmarked experiments. Some benchmarks, including criticality and subcritical experiments interested in multiplication and bulk counting rates, are easy to model and understand but are likely insensitive to themore » detailed nature of these models. It will take some new measurements with coincidence detection capabilities to be able to stress the physics within each of these fission event generator models. Once the models are validated and it is understood where the models can truly be predictive, then we can study what SNM observables can be characterized for nonproliferation applications.« less