نتایج جستجو برای: neutron diffusion
تعداد نتایج: 208482 فیلتر نتایج به سال:
We measured in situ the radiation-induced absorption of pure silica core fibers exposed to a fission nuclear radiation. We observed the growth of the 1.38m OH vibration band in polymer coated fiber. Two contributions, a gamma-induced hydrogen diffusion and the recoil protons, are compared. The major contribution to the OH content growth is identified to originate from the gamma-induced hydrogen...
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Understanding the molecular mechanism of proton conduction is crucial for the design of new materials with improved conductivity. Quasi-elastic neutron scattering (QENS) has been used to probe the mechanism of proton diffusion within a new phosphonate-based metal-organic framework (MOF) material, MFM-500(Ni). QENS suggests that the proton conductivity (4.5 × 10(-4) S/cm at 98% relative humidity...
Neutron powder diffraction has uncovered major stoichiometry-driven structural differences in NMC cathodes otherwise obscured lab-based X-ray diffraction. The atomic scale Li diffusion also been probed by muon spin relaxation.
We present evidence from neutron diffraction measurements and molecular dynamics (MD) simulations of three different monolayer phases of the intermediate-length alkanes tetracosane (n-C(24)H(50) denoted as C24) and dotriacontane (n-C(32)H(66) denoted as C32) adsorbed on a graphite basal-plane surface. Our measurements indicate that the two monolayer films differ principally in the transition te...
We propose event by event velocity fluctuations of nuclear fission fragments as an additional interesting observable that gives access to the nuclear temperature in an independent way from spectral measurements and relates the diffusion and friction coefficients for the relative fragment coordinate in Kramer-like models (in which some aspects of fission can be understood as the diffusion of a c...
Neutron Generators (NG) are used as a neutron source for different applications. During recent years, major efforts are underway to develop a high yield compact NG. In this way, radiation protection aspects need to be considered during the operation of these high yield NGs. In this paper the neutron effective dose of a NG operator has been calculated using MCNPX Monte Carlo code. The results sh...
Thermal-neutron detectors based on 4H-SiC semiconductor and 10B converter reactions have many advantages for neutron dosimetry monitoring applications. These radiation-resistant are capable of stable operation in elevated-temperature environments up to 700 °C extended periods. The recent development SiC where the 10 B is incorporated into detector by ion implantation or diffusion leads interest...
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