Measurement of 150-Sm(n,2ngammai) 149-Sm cross sections between threshold and 20 MeV

Cooper, J ; Becker, J ; Dashdorj, D ; Dietrich, F S ; Garrett, P ; Hoffman, R ; Younes, W ; Nelson, R ; Devlin, M ; Fotiades, N

Lawrence Livermore National Laboratory

关键词: Spectrometers;    Decay;    Ground States;    Neutrons;    Production;   

DOI  :  10.2172/15014533
RP-ID  :  UCRL-TR-205760
RP-ID  :  W-7405-ENG-48
RP-ID  :  15014533

美国|英语

来源: UNT Digital Library

【 摘 要 】

Absolute partial {gamma}-ray cross sections for the production of discrete {gamma}-rays from the reaction {sup 150}Sm(n,2n{gamma}{sub i}){sup 149}Sm were measured using the GEANIE {gamma}-ray spectrometer coupled with the intense white neutron source at WNR/LANSCE. The measurements were made for incident neutron energies between threshold (8.04 MeV) and 20 MeV. The partial cross sections for 21 {gamma}-rays were extracted from the data. Of these, 17 were compared to calculations performed using the enhanced Hauser-Feshbach code STAPRE. The partial {gamma}-ray cross sections of the observed parallel decay paths to the ground state were summed, forming a lower bound for the (n,2n) reaction channel. A combination of theory and experiment was then used to deduce the (n,2n) reaction channel cross section.