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Title: 242Pu absolute neutron-capture cross section measurement

Authors:
; ; ; ; ; ; ; ; ; ; ;
Publication Date:
Research Org.:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1326880
Report Number(s):
LLNL-PROC-701580
DOE Contract Number:
AC52-07NA27344
Resource Type:
Conference
Resource Relation:
Conference: Presented at: International Conference on Nuclear Data for Science and Technology, Bruges, Belgium, Sep 11 - Sep 16, 2016
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS

Citation Formats

Buckner, M Q, Wu, C Y, Henderson, R A, Bucher, B, Chyzh, A, Bredeweg, T A, Baramsai, B, Couture, A, Jandel, M, Mosby, S, O'Donnell, J M, and Ullmann, J L. 242Pu absolute neutron-capture cross section measurement. United States: N. p., 2016. Web.
Buckner, M Q, Wu, C Y, Henderson, R A, Bucher, B, Chyzh, A, Bredeweg, T A, Baramsai, B, Couture, A, Jandel, M, Mosby, S, O'Donnell, J M, & Ullmann, J L. 242Pu absolute neutron-capture cross section measurement. United States.
Buckner, M Q, Wu, C Y, Henderson, R A, Bucher, B, Chyzh, A, Bredeweg, T A, Baramsai, B, Couture, A, Jandel, M, Mosby, S, O'Donnell, J M, and Ullmann, J L. 2016. "242Pu absolute neutron-capture cross section measurement". United States. doi:. https://www.osti.gov/servlets/purl/1326880.
@article{osti_1326880,
title = {242Pu absolute neutron-capture cross section measurement},
author = {Buckner, M Q and Wu, C Y and Henderson, R A and Bucher, B and Chyzh, A and Bredeweg, T A and Baramsai, B and Couture, A and Jandel, M and Mosby, S and O'Donnell, J M and Ullmann, J L},
abstractNote = {},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = 2016,
month = 8
}

Conference:
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  • Cited by 1
  • Here, the absolute neutron-capture cross section of 242Pu was measured at the Los Alamos Neutron Science Center using the Detector for Advanced Neutron-Capture Experiments array along with a compact parallel-plate avalanche counter for fission-fragment detection. The first direct measurement of the 242Pu(n,γ) cross section was made over the incident neutron energy range from thermal to ≈ 6 keV, and the absolute scale of the (n,γ) cross section was set according to the known 239Pu(n,f) resonance at E n,R = 7.83 eV. This was accomplished by adding a small quantity of 239Pu to the 242Pu sample. The relative scale of themore » cross section, with a range of four orders of magnitude, was determined for incident neutron energies from thermal to ≈ 40 keV. Our data, in general, are in agreement with previous measurements and those reported in ENDF/B-VII.1; the 242Pu(n,γ) cross section at the E n,R = 2.68 eV resonance is within 2.4% of the evaluated value. However, discrepancies exist at higher energies; our data are ≈30% lower than the evaluated data at E n ≈ 1 keV and are approximately 2σ away from the previous measurement at E n ≈ 20 keV.« less
  • The cross section of the {sup 99m}{Tc}(n,{gamma}){sup 100}{Tc} reaction has been measured by means of an activation method for the purpose to obtain fundamental data for the research of the nuclear transmutation of long-lived waste nuclides. Targets containing about 370 kBq of {sup 99}{Tc} were irradiated for 2 m with reactor neutrons. The neutron fluxes were monitored by Co/Al and Au/Al alloy wires. Intensities of the 540-keV and the 591-keV gamma-rays from {sup 100}{Tc} were measured by a HPGe detector and decay of the intensities were followed. A half-life of the decay was 15.5 {+-} 0.1 s. Specific activity ofmore » {sup 99}{Tc} in the targets were obtained by the liquid scintillation counting method. Then, the amount of {sup 99}{Tc} in the targets were determined. A cross section of {sup 99}{Tc}(n,{gamma}) {sup 100}{Tc} reaction was determined from the number of {sup 99}{Tc} atoms in the target, the activity of the produced {sup 100}{Tc} and the neutron flux data. The cross section obtained is 22.7 {+-} 1.1 b and is almost same as the values reported in the references. The resonance integral was also measured by a Cd-ratio method and is 395 {+-} 34 b.« less