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Title: Neutron Spectroscopy for pulsed beams with frame overlap using a double time-of-flight technique

Abstract

A new double time-of- ight (dTOF) neutron spectroscopy technique has been developed for pulsed broad spectrum sources with a duty cycle that results in frame overlap, where fast neutrons from a given pulse overtake slower neutrons from previous pulses. Using a tunable beam at the 88-Inch Cyclotron at Lawrence Berkeley National Laboratory, neutrons were produced via thick-target breakup of 16 MeV deuterons on a beryllium target in the cyclotron vault. The breakup spectral shape was deduced from a dTOF measurement using an array of EJ-309 organic liquid scintillators. Simulation of the neutron detection efficiency of the scintillator array was performed using both GEANT4 and MCNP6. The efficiency- corrected spectral shape was normalized using a foil activation technique to obtain the energy-dependent flux of the neutron beam at zero degrees with respect to the incoming deuteron beam. The dTOF neutron spectrum was compared to spectra obtained using HEPROW and GRAVEL pulse height spectrum unfolding techniques. While the unfolding and dTOF results exhibit some discrepancies in shape, the integrated flux values agree within two standard deviations. As a result, this method obviates neutron time-of-flight spectroscopy challenges posed by pulsed beams

Authors:
 [1];  [1];  [1];  [2];  [3];  [2];  [2];  [2];  [2]
  1. Univ. of California, Berkeley, CA (United States). Department of Nuclear Engineering
  2. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
  3. Univ. of California, Berkeley, CA (United States). Department of Nuclear Engineering; Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Publication Date:
Research Org.:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States); Univ. of California, Berkeley, CA (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA), Office of Defense Nuclear Nonproliferation
Contributing Org.:
Nuclear Science and Security Consortium
OSTI Identifier:
1409925
Alternate Identifier(s):
OSTI ID: 1405145; OSTI ID: 1569309
Report Number(s):
LLNL-JRNL-738353
Journal ID: ISSN 0168-9002
Grant/Contract Number:  
AC52-07NA27344; NA0000979; NA0003180; AC02-05CH11231; NSF 11–582; 12-LR-238745; AC52–07NA27344
Resource Type:
Accepted Manuscript
Journal Name:
Nuclear Instruments and Methods in Physics Research. Section A, Accelerators, Spectrometers, Detectors and Associated Equipment
Additional Journal Information:
Journal Volume: 877; Journal Issue: C; Journal ID: ISSN 0168-9002
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
74 ATOMIC AND MOLECULAR PHYSICS; Neutron spectroscopy; Deuteron breakup; Foil activation analysis; Time-of-flight; 46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY

Citation Formats

Harrig, K. P., Goldblum, B. L., Brown, J. A., Bleuel, D. L., Bernstein, L. A., Bevins, J., Harasty, M., Laplace, T. A., and Matthews, E. F.. Neutron Spectroscopy for pulsed beams with frame overlap using a double time-of-flight technique. United States: N. p., 2017. Web. https://doi.org/10.1016/j.nima.2017.09.051.
Harrig, K. P., Goldblum, B. L., Brown, J. A., Bleuel, D. L., Bernstein, L. A., Bevins, J., Harasty, M., Laplace, T. A., & Matthews, E. F.. Neutron Spectroscopy for pulsed beams with frame overlap using a double time-of-flight technique. United States. https://doi.org/10.1016/j.nima.2017.09.051
Harrig, K. P., Goldblum, B. L., Brown, J. A., Bleuel, D. L., Bernstein, L. A., Bevins, J., Harasty, M., Laplace, T. A., and Matthews, E. F.. Mon . "Neutron Spectroscopy for pulsed beams with frame overlap using a double time-of-flight technique". United States. https://doi.org/10.1016/j.nima.2017.09.051. https://www.osti.gov/servlets/purl/1409925.
@article{osti_1409925,
title = {Neutron Spectroscopy for pulsed beams with frame overlap using a double time-of-flight technique},
author = {Harrig, K. P. and Goldblum, B. L. and Brown, J. A. and Bleuel, D. L. and Bernstein, L. A. and Bevins, J. and Harasty, M. and Laplace, T. A. and Matthews, E. F.},
abstractNote = {A new double time-of- ight (dTOF) neutron spectroscopy technique has been developed for pulsed broad spectrum sources with a duty cycle that results in frame overlap, where fast neutrons from a given pulse overtake slower neutrons from previous pulses. Using a tunable beam at the 88-Inch Cyclotron at Lawrence Berkeley National Laboratory, neutrons were produced via thick-target breakup of 16 MeV deuterons on a beryllium target in the cyclotron vault. The breakup spectral shape was deduced from a dTOF measurement using an array of EJ-309 organic liquid scintillators. Simulation of the neutron detection efficiency of the scintillator array was performed using both GEANT4 and MCNP6. The efficiency- corrected spectral shape was normalized using a foil activation technique to obtain the energy-dependent flux of the neutron beam at zero degrees with respect to the incoming deuteron beam. The dTOF neutron spectrum was compared to spectra obtained using HEPROW and GRAVEL pulse height spectrum unfolding techniques. While the unfolding and dTOF results exhibit some discrepancies in shape, the integrated flux values agree within two standard deviations. As a result, this method obviates neutron time-of-flight spectroscopy challenges posed by pulsed beams},
doi = {10.1016/j.nima.2017.09.051},
journal = {Nuclear Instruments and Methods in Physics Research. Section A, Accelerators, Spectrometers, Detectors and Associated Equipment},
number = C,
volume = 877,
place = {United States},
year = {2017},
month = {10}
}

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    Works referencing / citing this record:

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