scholarly journals Experiments with neutron induced neutron emission from U-235, Pu-239, and graphite

2020 ◽  
Vol 239 ◽  
pp. 01004
Author(s):  
Yaron Danon ◽  
Ezekiel Blain ◽  
Kumar Mohindroo ◽  
Matt Devlin ◽  
Keegan J.Kelly ◽  
...  

A neutron induced neutron emission experiment was conducted as the Los Alamos Neutron Science Center (LANSCE) facility at Los Alamos National Laboratory (LANL). In this experiment, a sample was placed in a well collimated neutron beam and was surrounded by an array of 28 fast neutron detectors (EJ-309). The experiment was performed with a neutron flight path of 21.5 m from the source to the sample, and 1 m from the sample to the detectors. The neutron emission from the sample was measured as a function of neutron time of flight covering an incident energy range from 0.7- 20 MeV. The samples included U-235, Pu-239, carbon (graphite), and blanks that matched the encapsulation of the sample. The measured samples were constantly cycled in and out of the neutron beam. This type of experiment measures neutron emission from all reactions occurring in the sample such as fission and elastic and inelastic scattering. Similar to the methodology previously developed at RPI [1], the measurements were compared with detailed simulations of the experiment using different cross section evaluations for the sample. The observed differences can be attributed to the evaluated neutron cross section and angular distributions. The carbon sample was used as a reference to validate both the experiment and simulation methodology and showed good agreement between experiments and simulations. A review of the experimental setup, analysis methods, and some of the results will be presented.

2004 ◽  
Vol 37 (1) ◽  
pp. 24-31 ◽  
Author(s):  
Paul Langan ◽  
Gayle Greene ◽  
Benno P. Schoenborn

In this report a neutron protein crystallography station (PCS) is described that has been built at Los Alamos National Laboratory for the study of proteins using the wavelength-resolved Laue technique. This user facility is the first of its kind to be built at a spallation neutron source and the first to use the wavelength-resolved Laue technique.


Author(s):  
О. О. Грицай ◽  
А. К. Гримало ◽  
В. В. Колотий ◽  
В. М. Венедиктов ◽  
С. П. Волковецький ◽  
...  

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