Deducing the 237U(n,f) cross-section using the Surrogate Ratio Method

Burke, J T ; Bernstein, L A ; Escher, J ; Ahle, L ; Church, J A ; Dietrich, F ; Moody, K J ; Norman, E B ; Phair, L W ; Fallon, P ; Clark, R ; Delaplanque, M ; Descovich, M ; Cromaz, M ; Lee, I Y ; Macchiavelli, A O ; McMahan, M A ; Moretto, L G ; Rodriguez-Vieitez, E ; Stephens, F S

Lawrence Livermore National Laboratory

关键词: Fission;    Energy Range;    43 Particle Accelerators;    Cyclotrons;    Neutrons;   

DOI  :  10.2172/883605
RP-ID  :  UCRL-TR-214631
RP-ID  :  W-7405-ENG-48
RP-ID  :  883605

美国|英语

来源: UNT Digital Library

【 摘 要 】

The authors have deduced the {sup 237}U(n,f) cross-section over an equivalent neutron energy range of 0 to 20 MeV using the Surrogate Ratio method. A 55 MeV {sup 4}He{sup 2+} beam from the 88 Inch Cyclotron at Lawrence Berkeley National Laboratory was used to induce fission in the following reactions {sup 238}U({alpha},{alpha}'f) and {sup 236}U({alpha},{alpha}'f). The {sup 238}U reaction was a surrogate for {sup 237}U(n,f) and the {sup 236}U reaction was used as a surrogate for {sup 235}U(n,f). The energies of the scattered alpha particles were detected in a fully depleted segmented silicon telescope array (STARS) over an angle range of 35{sup o} to 60{sup o} with respect to the beam axis. The fission fragments were detected in a third independent silicon detector located at backward angles between 106{sup o} to 131{sup o}.