Results 1 - 10 of 1380
Results 1 - 10 of 1380. Search took: 0.023 seconds
|Sort by: date | relevance|
[en] The response of electret dosemeter to slow neutrons exposure is cited, mentioning the preparation and the irradiation of dosemeter with Am-Be source. Some theory considerations about the response of electret dosemeter to slow and fast neutrons are also presented. (C.G.C.)
[pt]Mostra-se a resposta do dosimetro de eletreto a exposicao de neutrons lentos, mencionando a preparacao, os cuidados e a irradiacao do dosimetro a uma fonte de Am-Be. Apresentam-se tambem algumas consideracoes teoricas da resposta do dosimetro de eletreto a neutrons rapidos e a neutrons lentos. (C.G.C.)
[en] The response of the electret dosemeter to exposition of slow neutrons is studied. Different external coatings are used on the dosemeter (polyethylene, alminium, polyethylene + boron, aluminium + boron) and exposure curves (with and without water) are compared. (M.A.C.)
[pt]Estuda-se a resposta do dosimetro de eletreto a exposicao de neutrons lentos. Utilizam-se diferentes capas externas no dosimetro (polietileno, aluminio, polietileno + boro, aluminio + boro) comparando-se as curvas de exposicao com e sem moderador (agua). (M.A.C.)
[en] The author discusses the properties of slow neutrons which make them an important tool for studying condensed matter, some of the improvements in techniques which have taken place in the past 15 years, the enlargement of the accessible momentum and energy transfer ranges and some new developments in neutron sources
[en] The experimental data on spatial parity violation in slow neutron scattering are analyzed theoretically. Both statistical and valence mechanisms of parity violation are taken into account. It is shown that available experimental data can be described by using these two mechanisms with a universal constant F = -5 x 10-7, which determines the one-particle parity violating potential. 22 refs
[en] A solid-state neutron detector is disclosed for detecting both fast and slow neutrons comprises two layers, one of which contains a neutron-sensitive first material and the other of which contains a semiconducting second material containing hydrogen, the first and second materials meeting to form a rectifying junction therebetween. The neutrons are detected by detecting electron-hole pairs migrating in opposite directions relative to the junction. The electron-hole pairs are created by energetic free protons produced by the fast neutrons travelling through the second material and by energetic reaction particles produced by the slow neutrons travelling through the first material. Stacking several of these detectors next to each other enhances overall sensitivity for detecting both fast and slow neutrons
[en] A new scattering kernel to describe the interaction of slow neutrons with solid Deuterium was developed. The main characteristics of that system are contained in the formalism, including the lattice s density of states, the Young-Koppel quantum treatment of the rotations, and the internal molecular vibrations. The elastic processes involving coherent and incoherent contributions are fully described, as well as the spin-correlation effects. The results from the new model are compared with the best available experimental data, showing very good agreement.
[es]En este trabajo se presenta un nuevo modelo para describir la interaccion de neutrones con Deuterio solido (T<18.7K), a partir del cual se generan las secciones eficaces empleando el codigo NJOY con modificaciones para tratar este material. Las caracteristicas principales de este sistema molecular estan incorporadas en el modelo, incluyendo la densidad de estados vibracionales de la red cristalina, el tratamiento cuantico de los modos rotacionales y las vibraciones moleculares internas. Los procesos elasticos incluyendo las contribuciones coherentes e incoherentes estan considerados, como asa tambien los efectos cuanticos de correlaciones de espin. Los resultados producidos por este nuevo modelo se comparan con los mejores datos experimentales, encontrandose un excelente acuerdo.