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The possibility of description of the experimental data on total cross sections of the radiative neutron capture on 14C and 14N is considered within the frame of the potential cluster model with forbidden states and their classification according to the Young tableaux. It is shown that the used model and the potential construction methods allow us to reproduce correctly the behavior of experimental cross sections at the energies from 10 meV (10 -2 eV) to 1 MeV.
Neutron Energy Spectrum Correction Based on Capture Time in a Boron-Loaded Liquid Scintillation Detector
In current practice of the capture-gated technique, it is always assumed that neutron capture occurs only after the incoming neutron loses all of its kinetic energy. In this work, it is shown that this assumption may cause degradation of energy resolution in neutron spectrometry. The relation between degradation of energy resolution and the capture time is studied. A correction method based on this relation is proposed and demonstrated using Geant4 simulation toolkit.
Detection and Identification of Contraband in Air Cargo Containers Using Neutron Based Techniques
This paper describes and discusses the combined system which was installed to allocate and identify contraband materials hidden in air cargo containers by fast neutron radiography and neutron elemental analysis techniques. A slit of fan beam of fast neutrons emitted from Pu-Be source was used. The fast neutron fluxes passed through different lines crossing the hidden object were detected by a neutron spectrometer applies stilbene scintillator and pulse shape method to discriminate agnist undesired pulses of gamma-rays. A two channel spectroscopy method was used to eleminate the effect of spectrum shift caused by the benign materials surrounding the hidden object. The recognetion of the allocated suspected object was performed by measuring the gamma-ray spectrum emitted from the suspected object by a gamma spectrometer with NaI(Tl) detector fixed at the middle point of the container and at a vertical plane to the incident beam. Tests were carried out using 2.5 kg of RDX explosive material hidden withen materials of pasta, onion and ceramic tiles. The results of fast neutron radiography are presented in the form of attenuation relation profiles and 2D constructed images. The measured spectra of emitted gammarays were used to determine the energy and intensity of gamma lines emitted from different elemental constituent of the suspected object. The analysis of the constructed images and gamma-ray spectra obtained for different tests indicated the reliability and capability of the installed combined system for inspection of small and medsize containers for illicit traficking.
The Numerical Analysis of Beta Decay Stimulation by the High Thermal Spike Single Photon Incidence to Valence Nucleons
Since, at RHIC and LHC heavy-ion colliders the classical color field play an important role to study production of quark-gluon plasma, we propose a theory to describe strong-field inside the nucleons based on Dual Ginzburg-Landau-Pitaevski (DGL) theory.