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Title: 239Pu(n, 2n) and 241Pu(n, 2n) surrogate cross section measurements using NeutronSTARS

Abstract

The goal of this project was to develop a new approach to measuring (n,2n) reactions for isotopes of interest. We set out to measure the 239Pu(n,2n) and 241Pu(n,2n) cross sections by directly detecting the 2n neutrons that are emitted. With the goal of improving the 239Pu(n,2n) cross section and to measure the 241Pu(n,2n) cross section for the first time. To that end, we have constructed a new neutron-charged-particle detector array called NeutronSTARS. It has been described extensively in Casperson et al. [1] and in Akindele et al. [2]. We have used this new neutron-charged-particle array to measure the 241Pu and 239Pu fission neutron multiplicity as a function of equivalent incident-neutron energy from 100 keV to 20 MeV. We have made a preliminary determination of the 239Pu(n,2n) and 241Pu(n,2n) cross sections from the surrogate 240Pu(α,α’2n) and 242Pu(α,α’2n) reactions respectively. The experimental approach, detector array, data analysis, and results to date are summarized in the following sections.

Authors:
 [1];  [1];  [2];  [1];  [1];  [1];  [3];  [1];  [2];  [4];  [5];  [1]
  1. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
  2. Univ. of California, Berkeley, CA (United States)
  3. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States); Oregon State Univ., Corvallis, OR (United States)
  4. Univ. of California, Los Angeles, CA (United States)
  5. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States); Univ. of California, Los Angeles, CA (United States)
Publication Date:
Research Org.:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1416503
Report Number(s):
LLNL-TR-743617
TRN: US1801173
DOE Contract Number:  
AC52-07NA27344
Resource Type:
Technical Report
Country of Publication:
United States
Language:
English
Subject:
22 GENERAL STUDIES OF NUCLEAR REACTORS; 73 NUCLEAR PHYSICS AND RADIATION PHYSICS; FISSION NEUTRONS; PLUTONIUM 241; PLUTONIUM 239; CROSS SECTIONS

Citation Formats

Burke, J. T., Alan, B. S., Akindele, O. A., Casperson, R. J., Hughes, R. O., Koglin, J. D., Tamashiro, A., Kolos, K., Norman, E. B., Saastamoinen, A., Padilla, A., and Fisher, S. 239Pu(n, 2n) and 241Pu(n, 2n) surrogate cross section measurements using NeutronSTARS. United States: N. p., 2017. Web. doi:10.2172/1416503.
Burke, J. T., Alan, B. S., Akindele, O. A., Casperson, R. J., Hughes, R. O., Koglin, J. D., Tamashiro, A., Kolos, K., Norman, E. B., Saastamoinen, A., Padilla, A., & Fisher, S. 239Pu(n, 2n) and 241Pu(n, 2n) surrogate cross section measurements using NeutronSTARS. United States. doi:10.2172/1416503.
Burke, J. T., Alan, B. S., Akindele, O. A., Casperson, R. J., Hughes, R. O., Koglin, J. D., Tamashiro, A., Kolos, K., Norman, E. B., Saastamoinen, A., Padilla, A., and Fisher, S. Fri . "239Pu(n, 2n) and 241Pu(n, 2n) surrogate cross section measurements using NeutronSTARS". United States. doi:10.2172/1416503. https://www.osti.gov/servlets/purl/1416503.
@article{osti_1416503,
title = {239Pu(n, 2n) and 241Pu(n, 2n) surrogate cross section measurements using NeutronSTARS},
author = {Burke, J. T. and Alan, B. S. and Akindele, O. A. and Casperson, R. J. and Hughes, R. O. and Koglin, J. D. and Tamashiro, A. and Kolos, K. and Norman, E. B. and Saastamoinen, A. and Padilla, A. and Fisher, S.},
abstractNote = {The goal of this project was to develop a new approach to measuring (n,2n) reactions for isotopes of interest. We set out to measure the 239Pu(n,2n) and 241Pu(n,2n) cross sections by directly detecting the 2n neutrons that are emitted. With the goal of improving the 239Pu(n,2n) cross section and to measure the 241Pu(n,2n) cross section for the first time. To that end, we have constructed a new neutron-charged-particle detector array called NeutronSTARS. It has been described extensively in Casperson et al. [1] and in Akindele et al. [2]. We have used this new neutron-charged-particle array to measure the 241Pu and 239Pu fission neutron multiplicity as a function of equivalent incident-neutron energy from 100 keV to 20 MeV. We have made a preliminary determination of the 239Pu(n,2n) and 241Pu(n,2n) cross sections from the surrogate 240Pu(α,α’2n) and 242Pu(α,α’2n) reactions respectively. The experimental approach, detector array, data analysis, and results to date are summarized in the following sections.},
doi = {10.2172/1416503},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Fri Dec 08 00:00:00 EST 2017},
month = {Fri Dec 08 00:00:00 EST 2017}
}

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