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Title: Constraining the calculation of U 234 , 236 , 238 ( n , γ ) cross sections with measurements of the γ -ray spectra at the DANCE facility

The cross section for neutron capture in the continuum region has been difficult to calculate accurately. Previous results for 238 U show that including an M 1 scissors-mode contribution to the photon strength function resulted in very good agreement between calculation and measurement. Our paper extends that analysis to 234 , 236 U by using γ -ray spectra measured with the Detector for Advanced Neutron Capture Experiments (DANCE) at the Los Alamos Neutron Science Center to constrain the photon strength function used to calculate the capture cross section. Calculations using a strong scissors-mode contribution reproduced the measured γ -ray spectra and were in excellent agreement with the reported cross sections for all three isotopes.
Authors:
 [1] ;  [1] ;  [1] ;  [1] ;  [1] ;  [1] ;  [1] ;  [1] ;  [1] ;  [1] ;  [1] ;  [2] ;  [3] ;  [3] ;  [3] ;  [4]
  1. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  2. Charles Univ., Prague (Czech Republic)
  3. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
  4. North Carolina State Univ., Raleigh, NC (United States)
Publication Date:
Report Number(s):
LLNL-JRNL-725205
Journal ID: ISSN 2469-9985; PRVCAN
Grant/Contract Number:
AC52-07NA27344; AC52-06NA25396; FG02-97ER41042; NA0001784
Type:
Accepted Manuscript
Journal Name:
Physical Review C
Additional Journal Information:
Journal Volume: 96; Journal Issue: 2; Journal ID: ISSN 2469-9985
Publisher:
American Physical Society (APS)
Research Org:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
OSTI Identifier:
1390023
Alternate Identifier(s):
OSTI ID: 1377957

Ullmann, J. L., Kawano, T., Baramsai, B., Bredeweg, T. A., Couture, A., Haight, R. C., Jandel, M., O'Donnell, J. M., Rundberg, R. S., Vieira, D. J., Wilhelmy, J. B., Krtička, M., Becker, J. A., Chyzh, A., Wu, C. Y., and Mitchell, G. E.. Constraining the calculation of U234,236,238(n,γ) cross sections with measurements of the γ -ray spectra at the DANCE facility. United States: N. p., Web. doi:10.1103/PhysRevC.96.024627.
Ullmann, J. L., Kawano, T., Baramsai, B., Bredeweg, T. A., Couture, A., Haight, R. C., Jandel, M., O'Donnell, J. M., Rundberg, R. S., Vieira, D. J., Wilhelmy, J. B., Krtička, M., Becker, J. A., Chyzh, A., Wu, C. Y., & Mitchell, G. E.. Constraining the calculation of U234,236,238(n,γ) cross sections with measurements of the γ -ray spectra at the DANCE facility. United States. doi:10.1103/PhysRevC.96.024627.
Ullmann, J. L., Kawano, T., Baramsai, B., Bredeweg, T. A., Couture, A., Haight, R. C., Jandel, M., O'Donnell, J. M., Rundberg, R. S., Vieira, D. J., Wilhelmy, J. B., Krtička, M., Becker, J. A., Chyzh, A., Wu, C. Y., and Mitchell, G. E.. 2017. "Constraining the calculation of U234,236,238(n,γ) cross sections with measurements of the γ -ray spectra at the DANCE facility". United States. doi:10.1103/PhysRevC.96.024627. https://www.osti.gov/servlets/purl/1390023.
@article{osti_1390023,
title = {Constraining the calculation of U234,236,238(n,γ) cross sections with measurements of the γ -ray spectra at the DANCE facility},
author = {Ullmann, J. L. and Kawano, T. and Baramsai, B. and Bredeweg, T. A. and Couture, A. and Haight, R. C. and Jandel, M. and O'Donnell, J. M. and Rundberg, R. S. and Vieira, D. J. and Wilhelmy, J. B. and Krtička, M. and Becker, J. A. and Chyzh, A. and Wu, C. Y. and Mitchell, G. E.},
abstractNote = {The cross section for neutron capture in the continuum region has been difficult to calculate accurately. Previous results for 238 U show that including an M 1 scissors-mode contribution to the photon strength function resulted in very good agreement between calculation and measurement. Our paper extends that analysis to 234 , 236 U by using γ -ray spectra measured with the Detector for Advanced Neutron Capture Experiments (DANCE) at the Los Alamos Neutron Science Center to constrain the photon strength function used to calculate the capture cross section. Calculations using a strong scissors-mode contribution reproduced the measured γ -ray spectra and were in excellent agreement with the reported cross sections for all three isotopes.},
doi = {10.1103/PhysRevC.96.024627},
journal = {Physical Review C},
number = 2,
volume = 96,
place = {United States},
year = {2017},
month = {8}
}