The 235U(n,2n(gamma)) Yrast Partial Gamma-Ray Cross Sections: A Report on the 1998 -- 1999 GEANIE Data and Analysis Techniques

Younes, W ; Becker, J A ; Bernstein, L A ; Garret, P E ; McGrath, C A ; McNabb, D P ; Nelson, R O ; Devlin, M ; Fotiades, N ; Johns, G D

Lawrence Livermore National Laboratory

关键词: Spectrometers;    71 Classical And Quantum Mechanics, General Physics;    43 Particle Accelerators;    Simulation;    Nuclear Reactions;   

DOI  :  10.2172/15013508
RP-ID  :  UCRL-ID-140313
RP-ID  :  W-7405-ENG-48
RP-ID  :  15013508

美国|英语

来源: UNT Digital Library

【 摘 要 】

Measurements of partial {sup 235}U(n,2n{gamma}) {gamma}-ray cross sections have been carried out as a function of incident neutron energy using the GEANIE spectrometer at LANSCE/WNR. The yields of {gamma} rays resulting from the population of discrete levels in the residual nucleus {sup 234}U have been measured at incident neutron energies in the 1-20-MeV range. These data provide, with the aid of nuclear reaction modeling, a measurement of the {sup 235}U(n,2n) reaction cross section and serve as a proof of principle of the y-ray technique for the parallel 23gPu(n,2n) measurement [l]. This paper presents the analysis of the {gamma}-ray data and the extraction of partial {gamma}-ray cross sections as a function of incident neutron energy. Uncertainties associated with the spectroscopic analysis of the data and validation of the results are discussed in detail.