The Experts below are selected from a list of 17754 Experts worldwide ranked by ideXlab platform
Yu. V. Nikitenko - One of the best experts on this subject based on the ideXlab platform.
-
Grazing-Incidence Neutron Spectrometer Detecting Neutrons and Charged Particles
Journal of Surface Investigation-x-ray Synchrotron and Neutron Techniques, 2019Co-Authors: V. D. Zhaketov, A. V. Petrenko, S. N. Vdovichev, V. V. Travkin, Attila Csik, Yu. N. Kopatch, Yu. M. Gledenov, E. Sansarbayar, N. A. Gundorin, Yu. V. NikitenkoAbstract:An ionization chamber is installed to the REMUR Neutron Spectrometer, situated at channel no. 8 of the IBR-2. A layered structure containing a layer of the isotope under study with a thickness of several nanometers is placed into the chamber. A Neutron beam enters the chamber and is incident on the structure. The reflected Neutron beam and the Neutron beam transmitted through the structure are recorded by a detector located outside the chamber. A fraction of Neutrons incident on the structure is captured by the nuclei of the isotope under study. As a result, secondary radiation is generated in the form of charged particles, which are recorded by the ionization chamber. The dependences of the Neutron and charged particle intensities on the transmitted wave vector of Neutrons are used to determine the spatial dependences of the potential of interaction between Neutrons with the entire structure and with a layer of the isotope under study. The Neutron Spectrometer in grazing geometry, using which the Neutrons and charged particles are recorded in studying the layered structures, is described. The results of Spectrometer testing with the use of structures containing the 6Li isotope are given.
-
Grazing incidence spin-echo Neutron Spectrometer
Journal of Surface Investigation. X-ray Synchrotron and Neutron Techniques, 2016Co-Authors: Yu. V. NikitenkoAbstract:A device for the excitation and detection of Neutron magnetic-moment precession, consisting of a pair of magnetic mirrors placed in a magnetic field, is discussed. The device may be used as the phase-shifting element in a spin-echo Neutron Spectrometer, which measures the correlation time of the oscillations of a medium or the correlation length of its density. It is shown that in a magnetic field with an intensity of up to 1 kOe, the probability of Neutron scattering can be measured from the minimum values of the wave vector of 10–7 A–1 and the transmitted energy of 1 peV.
-
A Position-Sensitive Detector for the Polarized-Neutron Spectrometer
Instruments and Experimental Techniques, 2001Co-Authors: O. V. Fateev, Yu. V. Nikitenko, G. A. Cheremukhina, S. P. Chernenko, Yu. V. Zanevsky, H. Lauter, V. V. Lauter, S. V. Kozhevnikov, A. V. PetrenkoAbstract:A linear detector of thermal Neutrons, developed at the Laboratory for High Energies (Joint Institute for Nuclear Research), is used in the polarized-Neutron Spectrometer of the ИБР-2 reactor (JINR). The data are acquired in the regime of frame-by-frame survey to select Neutrons with a wavelength λ = 1–12 Å by the time of flight. The Neutron-detection efficiency is ∼ 70% for a wavelength of 2 Å. The detector exhibits a low sensitivity to γ-rays, a differential nonlinearity of ∼1.5%, and a spatial resolution of ∼1.5 mm at counting rates of ∼10^5events/s.
-
A Position-Sensitive Detector for the Polarized-Neutron Spectrometer
Instruments and Experimental Techniques, 2001Co-Authors: O. V. Fateev, Yu. V. Nikitenko, G. A. Cheremukhina, S. P. Chernenko, Yu. V. Zanevsky, H. Lauter, V. V. Lauter, S. V. Kozhevnikov, A. V. PetrenkoAbstract:A linear detector of thermal Neutrons, developed at the Laboratory for High Energies (Joint Institute for Nuclear Research), is used in the polarized-Neutron Spectrometer of the aAe-2 reactor (JINR). The data are acquired in the regime of frame-by-frame survey to select Neutrons with a wavelength λ = 1—12 A by the time of flight. The Neutron-detection efficiency is ~70% for a wavelength of 2 A. The detector exhibits a low sensitivity to γ -rays, a dif- ferential nonlinearity of ~1.5%, and a spatial resolution of ~1.5 mm at counting rates of ~10 5 events/s.
A. V. Petrenko - One of the best experts on this subject based on the ideXlab platform.
-
Grazing-Incidence Neutron Spectrometer Detecting Neutrons and Charged Particles
Journal of Surface Investigation-x-ray Synchrotron and Neutron Techniques, 2019Co-Authors: V. D. Zhaketov, A. V. Petrenko, S. N. Vdovichev, V. V. Travkin, Attila Csik, Yu. N. Kopatch, Yu. M. Gledenov, E. Sansarbayar, N. A. Gundorin, Yu. V. NikitenkoAbstract:An ionization chamber is installed to the REMUR Neutron Spectrometer, situated at channel no. 8 of the IBR-2. A layered structure containing a layer of the isotope under study with a thickness of several nanometers is placed into the chamber. A Neutron beam enters the chamber and is incident on the structure. The reflected Neutron beam and the Neutron beam transmitted through the structure are recorded by a detector located outside the chamber. A fraction of Neutrons incident on the structure is captured by the nuclei of the isotope under study. As a result, secondary radiation is generated in the form of charged particles, which are recorded by the ionization chamber. The dependences of the Neutron and charged particle intensities on the transmitted wave vector of Neutrons are used to determine the spatial dependences of the potential of interaction between Neutrons with the entire structure and with a layer of the isotope under study. The Neutron Spectrometer in grazing geometry, using which the Neutrons and charged particles are recorded in studying the layered structures, is described. The results of Spectrometer testing with the use of structures containing the 6Li isotope are given.
-
A Position-Sensitive Detector for the Polarized-Neutron Spectrometer
Instruments and Experimental Techniques, 2001Co-Authors: O. V. Fateev, Yu. V. Nikitenko, G. A. Cheremukhina, S. P. Chernenko, Yu. V. Zanevsky, H. Lauter, V. V. Lauter, S. V. Kozhevnikov, A. V. PetrenkoAbstract:A linear detector of thermal Neutrons, developed at the Laboratory for High Energies (Joint Institute for Nuclear Research), is used in the polarized-Neutron Spectrometer of the ИБР-2 reactor (JINR). The data are acquired in the regime of frame-by-frame survey to select Neutrons with a wavelength λ = 1–12 Å by the time of flight. The Neutron-detection efficiency is ∼ 70% for a wavelength of 2 Å. The detector exhibits a low sensitivity to γ-rays, a differential nonlinearity of ∼1.5%, and a spatial resolution of ∼1.5 mm at counting rates of ∼10^5events/s.
-
A Position-Sensitive Detector for the Polarized-Neutron Spectrometer
Instruments and Experimental Techniques, 2001Co-Authors: O. V. Fateev, Yu. V. Nikitenko, G. A. Cheremukhina, S. P. Chernenko, Yu. V. Zanevsky, H. Lauter, V. V. Lauter, S. V. Kozhevnikov, A. V. PetrenkoAbstract:A linear detector of thermal Neutrons, developed at the Laboratory for High Energies (Joint Institute for Nuclear Research), is used in the polarized-Neutron Spectrometer of the aAe-2 reactor (JINR). The data are acquired in the regime of frame-by-frame survey to select Neutrons with a wavelength λ = 1—12 A by the time of flight. The Neutron-detection efficiency is ~70% for a wavelength of 2 A. The detector exhibits a low sensitivity to γ -rays, a dif- ferential nonlinearity of ~1.5%, and a spatial resolution of ~1.5 mm at counting rates of ~10 5 events/s.
Marco Zoppi - One of the best experts on this subject based on the ideXlab platform.
-
TOSCA Neutron Spectrometer: The final configuration
Applied Physics A: Materials Science and Processing, 2002Co-Authors: Daniele Colognesi, F. Cilloco, S. F. Parker, Franco Sacchetti, Robert J. Newport, Milva Celli, V. Rossi Albertini, J Tomkinson, Marco ZoppiAbstract:The forward and backward scattering parts (phase 11) of the new Neutron Spectrometer, TOSCA, replacing the old TFXA and TOSCA (phase 1), have been successfully installed at the ISIS pulsed Neutron source. The results show a significant enhancement in the counting rate due to the larger detector area. The improved resolution (to 1.5%-3% of the energy transfer) as compared with the previous instruments (TXFA: 2.5%-3.5%; TOSCA-I: 2%-3.5%) has been achieved by increasing the primary flight path from 12 m to 17 m. A chopper has been added in order to avoid Neutron frame overlap and to reduce the fast Neutron background. Additional diffraction capability will be installed in the near future. An example of the high resolution that is routinely available is provided by the spectrum of potassium hydrogen phtalate at 20 K.
-
The Final Configuration of TOSCA Neutron Spectrometer
2001Co-Authors: Milva Celli, F. Cilloco, S. F. Parker, Daniele Colognesi, Franco Sacchetti, Robert J. Newport, J Tomkinson, V. Ross-albertini, Marco ZoppiAbstract:The forward and backward scattering parts of a new Neutron Spectrometer, TOSCA-II, replacing the old TFXA and TOSCA-I, have been sucessfully installed at the ISIS pulsed Neutron source. The results show a significant enhancement in the counting rate due to the large detector area. The improved reolustion (to 1.5÷3.5%, TOSCA-1 2÷3.5%) has been achieved by increasing the primary flight path from 12m to 17m. A chopper has been added in order to avoid Neutron overlap and to reduce the fast Neutron background. Additional diffraction capability will be installed in the near future.
Marcel Reginatto - One of the best experts on this subject based on the ideXlab platform.
-
Resolving power of a multisphere Neutron Spectrometer
Nuclear Instruments & Methods in Physics Research Section A-accelerators Spectrometers Detectors and Associated Equipment, 2002Co-Authors: Marcel ReginattoAbstract:The resolving power of a multisphere Neutron Spectrometer is determined using the approach of Backus and Gilbert.
-
maxed a computer code for maximum entropy deconvolution of multisphere Neutron Spectrometer data
Health Physics, 1999Co-Authors: Marcel Reginatto, P GoldhagenAbstract:Reliable Neutron dosimetry requires knowledge of the Neutron spectrum. We discuss the problem of analyzing data from a multisphere Neutron Spectrometer to infer the energy spectrum of the incident Neutrons and describe the code MAXED, a computer program developed to apply the maximum entropy principle to this problem. The code and documentation are available from the authors upon request.
-
maxed a computer code for the deconvolution of multisphere Neutron Spectrometer data using the maximum entropy method
Other Information: PBD: Jun 1998, 1998Co-Authors: Marcel Reginatto, P GoldhagenAbstract:The problem of analyzing data from a multisphere Neutron Spectrometer to infer the energy spectrum of the incident Neutrons is discussed. The main features of the code MAXED, a computer program developed to apply the maximum entropy principle to the deconvolution (unfolding) of multisphere Neutron Spectrometer data, are described, and the use of the code is illustrated with an example. A user`s guide for the code MAXED is included in an appendix. The code is available from the authors upon request.
P Goldhagen - One of the best experts on this subject based on the ideXlab platform.
-
maxed a computer code for maximum entropy deconvolution of multisphere Neutron Spectrometer data
Health Physics, 1999Co-Authors: Marcel Reginatto, P GoldhagenAbstract:Reliable Neutron dosimetry requires knowledge of the Neutron spectrum. We discuss the problem of analyzing data from a multisphere Neutron Spectrometer to infer the energy spectrum of the incident Neutrons and describe the code MAXED, a computer program developed to apply the maximum entropy principle to this problem. The code and documentation are available from the authors upon request.
-
maxed a computer code for the deconvolution of multisphere Neutron Spectrometer data using the maximum entropy method
Other Information: PBD: Jun 1998, 1998Co-Authors: Marcel Reginatto, P GoldhagenAbstract:The problem of analyzing data from a multisphere Neutron Spectrometer to infer the energy spectrum of the incident Neutrons is discussed. The main features of the code MAXED, a computer program developed to apply the maximum entropy principle to the deconvolution (unfolding) of multisphere Neutron Spectrometer data, are described, and the use of the code is illustrated with an example. A user`s guide for the code MAXED is included in an appendix. The code is available from the authors upon request.