J.J. Blostein

On the analysis of deep inelastic neutron scattering experiments for light nuclei

We analyze different procedures for data processing in deep inelastic neutron scattering experiments focussing our attention on experiments performed on light nuclei. We first examine experiments in which the desired information is obtained from the observed peak areas in the particular case of mixtures of light and heavy water. In the second part we examine the procedure to obtain an effective temperature from the experimental peaks. As a consequence of the results emerging from both cases we trace the limits of validity of the convolution formalism usually employed, and propose a different treatment of the experimental data for this kind of measurements.

Multiple scattering and attenuation corrections in Deep Inelastic Neutron Scattering experiments

Multiple scattering and attenuation corrections in Deep Inelastic Neutron Scattering experiments are analyzed. The theoretical basis of the method is stated, and a Monte Carlo procedure to perform the calculation is presented. The results are compared with experimental data. The importance of the accuracy in the description of the experimental parameters is tested, and the implications of the present results on the data analysis procedures is examined.

Enhanced plastic neutron shielding for thermal and epithermal neutrons

We describe a compound made of paraffin and boron carbide (boraffin) deviced to enhance epithermal neutron shielding. The compound is easily prepared and is specially suited to be adapted to particular surfaces. Transmission experiments show a favourable comparison with a commercial rubber-boron carbide compound in the epithermal range. A detector shielding built with this material is described and the achieved background reduction experimentally determined is shown.

Analysis of multiple scattering and multiphonon contributions in inelastic neutron scattering experiments

Abstract We present a method of analysis of inelastic neutron scattering (INS) experiments aiming at obtaining the density of phonon states in an absolute scale, as well as a reliable value of the mean-square displacement of the atoms. This method requires the measurement of the neutron total cross section of the sample as a function of energy, which provides a normalization condition for the INS experiment, as well as a value of the mean-square displacement. The method is applied in the case of an incoherent neutron scattering system, viz. the Ti–52wt.% Zr alloy. The applicability of this method to the study of metal alloys and other systems is discussed.