Fuzzy finite element solution of uncertain neutron diffusion equation for imprecisely defined homogeneous triangular bare reactor S. Nayak and S. Chakraverty * Department of Mathematics, National Institute of Technology, Rourkela, Odisha -769008, India Abstract: Scattering of neutron collision inside a reactor depends upon geometry of the reactor, diffusion coefficient and absorption coefficien...

2014 The component of the neutron quasi elastic line broadening in the oriented nematic phase, originating from the translation-rotational molecular coupling, is investigated. The molecules, approximated by ellipsoides, are assumed to undergo simple diffusion and a rotational Brownian motion along the long body axes. It is shown that in the nematic phase the translation, as modulated by the rot...

We present the Witten and the double Darboux constructions as applied to the diffusion of thermal neutrons from an infinitely long line source. Supersymmetric one-dimensional quantum mechanics has been introduced in 1981 as a toy model for symmetry-breaking phenomena in quantum field theory [1]. With great speed its status has changed to a powerful research discipline as one can contemplate in ...

Dynamics in protein solutions is essential for both protein function and cellular processes. The hierarchical complexity of global protein diffusion, side-chain diffusion, and microscopic motions of chemical groups renders a complete understanding challenging. We present results from quasi-elastic neutron scattering on protein solutions of γ-globulin over a wide range of volume fractions. Trans...

In this paper, we used a neutron diffusion hybrid equation with an external neutron source to calculate nuclear power factors in each fuel element in the reactor core. We used the nodal expansion method to obtain the neutron flux for a given control rods bank position. The results were compared with results obtained for eigenvalue problem near criticality condition and fixed source problem duri...

We have determined for the first time the velocity distribution of neutrons from a solid H2 ultracold neutron (UCN) source. The spectrum rises sharply above 4.5m/s and has a maximum around 7m/s after transport in an 8m long guide. The number of neutrons in the UCN velocity range (< 7m/s) may be increased by a factor of two by placing the experiment 1m above the UCN source level. PACS. 29.25.Dz ...

2014 Evidence for fast oxygen diffusion in the H and X high temperature phases of La2O3 is presented from neutron diffraction background analysis and neutron quasielastic scattering data. In the X phase at 2160 °C the translational self diffusion coefficient is of the order of 3 x 10-5 cm2/s and the mean time between jumps on neighbouring tetrahedral sites is around 1.4 x 10-12 s. These are typ...

We investigate three mechanisms that promote the loss of magnetic flux from an isolated neutron star. Ohmic decay produces a diffusion of the magnetic field with respect to the charged particles. It proceeds at a rate that is inversely proportional to the electric conductivity and independent of the magnetic field strength. Ohmic decay occurs in both the fluid core and solid crust of a neutron ...

Considerable progress has been achieved recently to enhance the thermal neutron detection efficiency of solid-state neutron detectors that incorporate neutron sensitive materials such as B and LiF in Si micro-structured p-n junction diode. Here, we describe the design, fabrication process optimization and characterization of an enriched boron filled honeycomb structured neutron detector with a ...