The 75As(n,2n) Cross Sections into the 74As Isomer and Ground State

Younes, W ; Garrett, P E ; Becker, J A ; Bernstein, L A ; Ormand, W E ; Dietrich, F S ; Nelson, R O ; Devlin, M ; Fotiades, N

Lawrence Livermore National Laboratory

关键词: Spectrometers;    Ground States;    Neutrons;    Cross Sections;    Isomers;   

DOI  :  10.2172/15004546
RP-ID  :  UCRL-ID-154061
RP-ID  :  W-7405-ENG-48
RP-ID  :  15004546

美国|英语

来源: UNT Digital Library

【 摘 要 】

The {sup 75}As(n, 2n) cross section for the population of the T{sub 1/2} = 26.8-ns isomer at E{sub x} = 259.3 keV in {sup 74}As has been measured as a function of incident neutron energy, from threshold to E{sub n} = 20 MeV. The cross section was measured using the GEANIE spectrometer at LANSCE/WNR. For convenience, the {sup 75}As(n, 2n) population cross section for the {sup 74}As ground state has been deduced as the difference between the previously-known (n, 2n) reaction cross section and the newly measured {sup 75}As(n, 2n){sup 74}As{sup m} cross section. The (n, 2n) reaction, ground-state, and isomer population cross sections are tabulated in this paper.