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Showing 1 to 15 of 15 for “"high energy neutrons"”.
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Dimuon Production by High-Energy Neutrons
Made available in DSpace on 2015-05-13T15:22:05Z (GMT). No. of bitstreams: 2 license.txt: 4848 bytes, checksum: 96035ab3f5e1c23cc7138a224ce498bd (MD5) 7709101.PDF: 1551247 bytes, checksum: 2c9b1ef5bf166c7ff6dbcbd999114da3 (MD5) Previous issue date: 1976
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Dimuon production by high energy neutrons
… Accelerator Laboratory, the dimuon production by high energy neutrons has been measured for incident neutron energies of approximately 250 and 320 GeV. The mass spectra show clear peaks in the rho-omega mass region and at the J /psi mass. Cross sections and longitudinal and transverse momenta …
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Production of charm mesons by high energy neutrons
… section per nucleon for D""'±, at most probable energy ...;s = 35 GeV, was measured to be: d:(xf) . BR = 2.11 ± .43 (±.63)JLb/nucleon Xf for 0.0 < x f < 0.14 (xf = .07). The branching ratio (BR) is defined as: BR =BR(D'"" -+ D1r) x BR(D -+ K+ K-). The dependence of the cross section per nucleus …
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Inactivation synergy between high energy neutrons and ⁶⁰Co gamma rays
The interaction between sublesions produced by neutrons [p(66)/Be and d(16)/Be] and ⁶⁰Co γ-rays was investigated using mammalian cells, meristematic cells and human lymphocytes. The quality of each radiation source was quantified in terms of molecular yield per unit dose absorbed in a ferrous …
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Towards measuring the relative biological effectiveness of high-energy neutrons at iThemba LABS
In space, neutrons with energies of up to several TeV are produced through the interac-tions of primary cosmic radiation with matter such as in spacecraft shielding, and in the atmospheres and regoliths of moons and planets. The development of radiation health-risk models for space exploration …
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Evaluation of the bubble spectrometer performance in space-like neutron fields
… bubble detectors each with a different neutron energy threshold. To characterize the spectrometer in a space-like neutron field, a series of experiments were conducted with high-energy neutrons from 6.0×105 eV to 7.50 ×108 eV at the Los Alamos National Laboratory. The analysis of the obtained …
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Design and construction of high-temperature, high-vacuum tensile tester for fusion reactor materials
Fusion energy is a promising carbon-free, limitless source of energy that could contribute to mitigating global climate change. One of the critical challenges in realizing fusion energy is the survival of structural materials in the extreme environment of a fusion device. Specifically, materials …
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Measuring and predicting radiation-induced soft errors in microprocessors
… measured for radiation effects of accelerated, high-energy neutrons at the Los Alamos Neutron Science Center at the request of NASA’s Jet Propulsion Laboratory. High energy neutrons are the product of galactic cosmic rays entering the earth’s atmosphere. The accelerated measurements can be …
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Monte Carlo simulations of the iThemba LABS neutron beam facility
… cross sections, the biological effectiveness of high-energy neutrons, calibration of detectors used for dose monitoring in space and aircrafts, and the development of neutron dose monitors. Neutron beams with energies up to 200 MeV are produced at iThemba LABS by irradiating thin targets of 7Li …
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Cross section measurements for neutron induced reactions on Bi targets using quasi mono-energetic neutron beams of 90 and 140 MeV
… library since the existing experimental data for high energy neutrons are insufficient.To the IRDFF library, the current contribution from iThemba LABS will improve the Bismuth (Bi) data for high threshold energy (n,xn) reactions with cross section peaks located at 90 and 140 MeV energies.
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Neutron Compton scattering from hydrogen and perovskite oxide interfaces
… one is an investigation of the scattering of high energy neutrons from hydrogen compounds. The motivation for this investigation stems from neutron Compton scattering experiments, performed with the VESUVIO neutron spectrometer at the ISIS pulsed neutron source, which report an anomalously …
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Characterization of fissile material using low energy neutron interrogation
… attack. The proposed system uses 60-100 keV neutrons, produced by the 7Li(p,n)7Be reaction in a linear accelerator and kinematically beamed into various targets. In the event that fissile material is present, highly energetic neutrons will be emitted from the fissioning of a nucleus and some …
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Investigation of the photoneutron cross section in 206Pb and 208 Pb from 9 to 16 MeV
The time of flight of photoneutrons from 206Pb and 208Pb was observed at scattering angles of 55 0 90 0 , and 125 o. Photons with energies between 9 and 16 MeV were used to excite the target nuclei. The incident photon beam was provided by the University of Illinois Tagged Photon Facility and had …
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Intermediate energy proton irradiation: An experimental and analytical foundation for bulk radiation damage testing
… plants will need to survive heavy exposure to high energy neutrons, outside of our current operating experience with fission reactors. Understanding the evolution of mechanical properties during radiation damage is essential to the design and commercial deployment of these systems. However, …
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Cosmic-ray neutron sensing for soil moisture measurements in cropped fields
… of the detection of natural background of fast neutrons, the so-called cosmic-ray neutron sensing (CRS) approach to measure field-scale soil moisture in cropped fields. Primary cosmic rays penetrate the top atmosphere and interact with atmospheric particles. Such interaction results on a cascade …