Fission Neutron Spectra Measurements At Lansce A Brief Progress Report
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Release | : 2009 |
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Download Fission Neutron Spectra Measurements at LANSCE - a Brief Progress Report Book in PDF, Epub and Kindle
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Release | : 2009 |
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Download Fission Neutron Spectra Measurements at LANSCE - Status and Plans Book in PDF, Epub and Kindle
A program to measure fission neutron spectra from neutron-induced fission of actinides is underway at the Los Alamos Neutron Science Center (LANSCE) in a collaboration among the CEA laboratory at Bruyeres-le-Chatel, Lawrence Livermore National Laboratory and Los Alamos National Laboratory. The spallation source of fast neutrons at LANSCE is used to provide incident neutron energies from less than 1 MeV to 100 MeV or higher. The fission events take place in a gas-ionization fission chamber, and the time of flight from the neutron source to that chamber gives the energy of the incident neutron. Outgoing neutrons are detected by an array of organic liquid scintillator neutron detectors, and their energies are deduced from the time of flight from the fission chamber to the neutron detector. Measurements have been made of the fission neutrons from fission of 235U, 238U, 237Np and 239Pu. The range of outgoing energies measured so far is from 1 MeV to approximately 8 MeV. These partial spectra and average fission neutron energies are compared with evaluated data and with models of fission neutron emission. Results to date will be presented and a discussion of uncertainties will be given in this presentation. Future plans are to make significant improvements in the fission chambers, neutron detectors, signal processing, data acquisition and the experimental environment to provide high fidelity data including mea urements of fission neutrons below 1 MeV and improvements in the data above 8 MeV.
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Release | : 2010 |
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Download Fission Neutron Output Measurements at LANSCE. Book in PDF, Epub and Kindle
Accurate data for both physical properties and fission properties of materials are necessary to properly model dynamic fissioning systems. To address the need for accurate data on fission neutron energy spectra, especially at outgoing neutron energies below about 200 keV and at energies above 8 MeV, ongoing work at LANSCE involving collaborators from LANL, LLNL and CEA Bruyeres-le-Chatel is extending the energy range, efficiency and accuracy beyond previous measurements. Initial work in the outgoing neutron energy range from 1 to 7 MeV is consistent with current evaluations and provides a foundation for extended measurements. As part of these efforts, a new fission fragment detector that reduces backgrounds and improves timing has been designed fabricated and tested, and new neutron detectors are being assessed for optimal characteristics. Simulations of experimental designs are in progress to ensure that accuracy goals are met. Results of these measurements will be incorporated into evaluations and data libraries as they become available.
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Total Pages | : 8 |
Release | : 2016 |
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Download The 235U Prompt Fission Neutron Spectrum Measured by the Chi-Nu Project at LANSCE. Book in PDF, Epub and Kindle
Author | : National Committee on Radiation Protection and Measurements (U.S.) |
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Total Pages | : 104 |
Release | : 1960 |
Genre | : Neutrons |
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Download Measurement of Neutron Flux and Spectra for Physical and Biological Applications Book in PDF, Epub and Kindle
Author | : National Committee on Radiation Protection and Measurements (U.S.) |
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Total Pages | : 104 |
Release | : 1960 |
Genre | : Neutron flux |
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Download Measurement of Neutron Flux and Spectra for Physical and Biological Applications Book in PDF, Epub and Kindle
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Release | : 2016 |
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Download Measuring the 235U Prompt Fission Neutron Spectrum Book in PDF, Epub and Kindle
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Release | : 2014 |
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Download Perspectives on Measurements of Prompt Fission Neutron Spectra for Fission Induced by Fast Neutrons Book in PDF, Epub and Kindle
Author | : J. A. Grundl |
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Total Pages | : 182 |
Release | : 1963 |
Genre | : Neutrons |
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Download Study of Fission Neutron Spectra with High-energy Activation Detectors Book in PDF, Epub and Kindle
Author | : Joseph A. Sayeg |
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Total Pages | : 50 |
Release | : 1960 |
Genre | : Neutron flux |
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Download Revised Neutron Flux, Spectrum, and Tissue Dose Measurements at the Godiva II Critical Assembly Book in PDF, Epub and Kindle