Investigation of 14.1 MeV neutrons interaction with C, Mg, Cr

This paper is dedicated to n+12C, n+24Mg, n+52Cr -reactions investigation at 14.1 MeV neutron energy. Characteristics of these reactions have been calculated using TALYS code to estimate perspectives of using of this code in data interpretation in the TANGRA project. This project is performed in Frank Laboratory of Neutron Physics (FLNP JINR) to investigate properties of (n,xγ)-type reactions, important for fundamental and practical applications

Investigation of 14.1 MeV neutrons interaction with C, Mg, Cr

358-362This paper is dedicated to n+12C, n+24Mg, n+52Cr -reactions investigation at 14.1 MeV neutron energy. Characteristics of these reactions have been calculated using TALYS code to estimate perspectives of using of this code in data interpretation in the TANGRA project. This project is performed in Frank Laboratory of Neutron Physics (FLNP JINR) to investigate properties of (n,xγ)-type reactions, important for fundamental and practical applications

Response function of a BGO detector for γ-rays with energies in the range from 0.2 MeV to 8 MeV

This work is devoted to determination of the response function of a BGO detector of γ-rays, which is used in experiments aimed at investigation of inelastic scattering of neutrons with energies of 14.1 MeV on various nuclei. A function is constructed to describe the Monte-Carlo simulated response of a gamma-detector, which allows taking into account all possible mechanisms of interaction of γ-rays with matter, as well as the geometric parameters of the detector. For all components of the function, an analytical form of their energy dependencies is selected and its parameters are determined in the case of registration of γ-quanta with energies in the range from 0.2 MeV to 8 MeV

Response function of a BGO detector for γ-rays with energies in the range from 0.2 MeV to 8 MeV

427-430This work is devoted to determination of the response function of a BGO detector of γ-rays, which is used in experiments aimed at investigation of inelastic scattering of neutrons with energies of 14.1 MeV on various nuclei. A function is constructed to describe the Monte-Carlo simulated response of a gamma-detector, which allows taking into account all possible mechanisms of interaction of γ-rays with matter, as well as the geometric parameters of the detector. For all components of the function, an analytical form of their energy dependencies is selected and its parameters are determined in the case of registration of γ-quanta with energies in the range from 0.2 MeV to 8 MeV

He-3 polarization via optical pumping in a birefringent cell

A sapphire cell was used to obtain a high He-3 nuclear polarization by means of spin-exchange optical pumping. The phase-shift difference between ordinary and extraordinary rays is well controlled using the thickness of the birefringent sapphire window so that a high circular polarization is obtained in the cell. Neutron transmission through the polarized He-3 gas was measured as a function of neutron energy. A large He-3 polarization of 63 +/- 1% was obtained at a He-3 pressure of 3.1 atm. Neutron polarizations of 97 and 90 % were obtained with transmission rates of 15 and 22 % at 10 and 20 meV, respectively. (c) 2005 American Institute of Physics

Measurement of total cross-sections of natural In and Cu at the Pohang Neutron Facility

The Pohang Neutron Facility consists of an electron linear accelerator, it water-cooled Ta target. and an 11-m time-of-flight path which has been constructed for nuclear data production. It has been equipped with a new four-position sample changer controlled remotely by a CAMAC data acquisition system, which allows simultaneous accumulation of the neutron time of flight spectra from 4 different detectors. The neutron total cross-sections of natural In and Cu were measured in the neutron energy range from 0.1eV to 100eV by using the neutron time of flight method with the new data acquisition system. A (LiZnS)-Li-6(Ag) glass scintillator was used as a neutron detector and metallic plates of natural In and Cu samples were used for the neutron transmission measurement. The neutron flight path from the water-cooled Ta target to the neutron detector was 10.81 +/- 0.02 m. The background level was determined by using notch-filters of Co. Ta. and Cd sheets. In order to reduce the gamma rays front Bremsstrahlung and those from neutron capture, we employed a neutron-gamma separation system based on their different pulse shapes. The present measurements are in general agreement with the evaluated data in ENDF/B-VI. The resonance parameters of the In isotope (In-115) were extracted from the transmission data and compared with the previous ones.11sciescopuskciothe

Nuclear data production facility based on the electron linac

The Pohang Neutron Facility, which is based on an electron linear accelerator, has been equipped with a new CAMAC data acquisition system consisting of a neutron-gamma separation circuit and a four-position sample changer for nuclear data production and for basic science experiments using neutrons. The system has been tested by measuring the neutron flux and the neutron total cross-sections of natural W and Ti samples with the Li-6-ZnS (Ag) scintillator by using the neutron time-of-flight method. The measured neutron total cross-sections are compared with other measured data and the evaluation data in ENDF/B-VI. The present measurements are in generally good agreement with other data and the evaluated data.X1139sciescopuskc