Hydrogen effects in neutron activation analysis |
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| Institution: | 1. Lomonosov Moscow State University, Scobeltsyn Institute of Nuclear Physics, Moscow 119991, Russian Federation;2. Institute of Nuclear Physics of the Republic of Kazakhstan, Almaty 050032, Kazakhstan;1. Department of Energy Engineering, Sharif University of Technology, Tehran, Iran;2. Physics and Accelerator Research School, Nuclear Science and Technology Research Institute, Tehran, Iran;3. Department of Physics, K.N. Toosi University of Technology, Tehran, Iran;1. College of Nursing, Michigan State University, East Lansing, Michigan, USA;2. College of Nursing, University of Arizona, Tucson, Arizona, USA;3. Department of Statistics and Probability, Michigan State University, East Lansing, Michigan, USA;4. Department of Communication, Michigan State University, East Lansing, Michigan, USA;5. Department of Epidemiology and Biostatistics, Michigan State University, East Lansing, Michigan, USA;6. Feinberg School of Medicine, Northwestern University, Evanston, Illinois, USA;7. College of Human Medicine, Michigan State University, East Lansing, Michigan, USA;1. Key Laboratory of Mesoscopic Chemistry of MOE, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210093, China;2. School of Chemical and Biological Engineering, Yancheng Institute of Technology, Yancheng 224051, China;1. Optoelectronics2Application (O2A) Research Group, Department of Electronics Engineering, S. V. National Institute of Technology, Surat 395007, India;2. Department of Electronics Engineering, National Institute of Technology, Srinagar 190006, India;3. Department of Electrical Engineering, Indian Institute of Technology Kanpur, Kanpur 208016, India |
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| Abstract: | Perturbations generated in two neutron fields, with different energy distributions, by scattering on hydrogen atoms are reported and discussed, as well as the influence of various parameters. The thermal neutron capture rates of several nuclei can be enhanced by about 18% in solutions in light water as compared to heavy water, for 20 cm3 cylindrical containers. This effect appears to be independent of the initial distribution of the epithermal neutrons, and can be accounted for by the scattering of non-Maxwellian, quasi thermalized neutrons to lower energies. The enhancement ratio is found to be about the same for a variety of nuclei (B, Hg, Gd, Eu, Sm and Cd), in spite of large differences in the variations of their cross sections with neutron energy. This can be explained by assuming that the incoming fluxes present a depression at the level of the Cd resonance, at about 0.18 eV. |
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