scholarly journals Возможность использования отрицательной спиновой компоненты в нейтронных поляризующих устройствах. Первые результаты

2019 ◽  
Vol 89 (6) ◽  
pp. 868
Author(s):  
Г.П. Гордеев ◽  
В.Н. Забенкин ◽  
Г.П. Диденко ◽  
Л.А. Аксельрод ◽  
И.М. Лазебник ◽  
...  
Keyword(s):  
Neutron Beam ◽  
Experimental Verification ◽  
Reflection Coefficients ◽  
Positive Component ◽  
Neutron Intensity ◽  
Average Polarization ◽  
Neutron Beams

The results of experimental verification of the possibility of increasing the neutron beams luminosity of polarizing devices based on magnetized supermirrors are presented. The essence of the experiment is to use both components of the neutron spins in the beam. The positive component is reflected from one magnetized mirror, and the passing mirror opposite component after turning 180 degree is reflected from another similar mirror. Both beams were recorded with one detector. Taking into account the reflection coefficients of the components by the mirrors and the efficiency of the rotation of the opposite component, an increase in the neutron intensity was obtained approximately twice with an average polarization of about 66%. The experiments were performed on a monochromatic neutron beam.

scholarly journals Neutron imager with micro channel plates (MCP) in electrostatic mirror configuration: Experimental test with radiation source

2018 ◽  
Vol 48 ◽  
pp. 1860120
Author(s):  
V. Variale ◽  
B. Skarbo
Keyword(s):  
Neutron Beam ◽  
Ccd Camera ◽  
Experimental Tests ◽  
Micro Channel ◽  
Spatial Profile ◽  
Critical Feature ◽  
Neutron Beams ◽  
Channel Plate ◽  
A Charge ◽  
Electrostatic Mirror

The design of a new high-transparency device based on a Micro Channel Plate (MCP) detector was recently proposed for monitoring the flux and beam spatial profile of neutron beams. The proposed device consists of a very thin aluminum (Al) foil (with a [Formula: see text]Li deposit) placed in the neutron beam and an MCP detector equipped with a phosphor-screen readout linked to a charge-coupled device (CCD) camera outside the neutron beam. A critical feature of this device is that it uses an electrostatic mirror to minimize the perturbation of the neutron beam (i.e., absorption and scattering). It can be used at existing neutron time-of-flight (n_TOF) facilities (in particular at the n_TOF facility at CERN) for monitoring the flux and spatial profile of neutron beams in the thermal and epithermal region. The experimental tests conducted for this study using a radioactive source to determine the behavior of the electrostatic mirror behavior will be presented and discussed in this paper.

scholarly journals Neutron interferometry, fifth force and axion like particles

2021 ◽  
Vol 81 (12) ◽  
Author(s):  
A. Capolupo ◽  
S. M. Giampaolo ◽  
A. Quaranta
Keyword(s):  
Magnetic Fields ◽  
Neutron Beam ◽  
Phase Difference ◽  
Neutron Interferometry ◽  
Fifth Force ◽  
Neutron Beams ◽  
Detection Strategy ◽  
Interferometric Measurement ◽  
The Future

AbstractWe propose a new possible detection strategy to reveal the fermion–fermion interaction mediated by axions and axion-like particles, based on interferometric measurement of neutron beams. We consider an interferometer in which the neutron beam is split in two sub-beams propagating in regions with differently oriented magnetic fields. The beam paths and the strength of the magnetic fields are set in such a way that the phase difference depends only on the axion-induced interaction. The resulting phase difference is directly related to the presence of axions. Our results show that such a phase might represent, in the future, a tool to probe the existence of axions and axion-like particles or a fifth force with interferometry.

scholarly journals Radiative Signatures of Neutron Beams in AGN

1994 ◽  
Vol 159 ◽  
pp. 345-345
Author(s):  
Ifeanyi E. Ekejiuba
Keyword(s):  
Neutron Beam ◽  
Energy Transport ◽  
Active Galaxies ◽  
Radio Sources ◽  
Beam Transport ◽  
Extragalactic Radio Sources ◽  
Production Region ◽  
Neutron Beams

The escape of relativistic neutrons from their production region can have various consequencies for the morphology of active galaxies. The phenomena of luminosity gaps and radio jet lighting in extragalactic radio sources (EGRSs) fit into the model that employs relativistic neutrons as the vector for particle and energy transport out of the central engines of AGNs. The central radio gaps reveal themselves as regions of relativistic neutron beam transport. The relativistic neutrons, which decay in flight after traveling for ∼ 103 γn s, produce secondaries which are responsible for the radio jet lighting and the associated phenomena in EGRSs.

scholarly journals INVESTIGATION OF PULSE SHAPE NEUTRON-GAMMA DISCRIMINATION

2019 ◽  
pp. 20-25
Author(s):  
R.V. Avetisyan ◽  
R.H. Avagyan ◽  
A.E. Avetisyan ◽  
A.V. Gyurjinyan ◽  
A.G. Barseghyan ◽  
...  
Keyword(s):  
Proton Beam ◽  
Neutron Beam ◽  
Gamma Rays ◽  
Pulse Shape ◽  
Gamma Ray ◽  
Beam Current ◽  
Pulse Shape Discrimination ◽  
Physics Institute ◽  
Neutron Beams ◽  
Yerevan Physics Institute

The role of neutron beam investigation is significant not only for fundamental science but also for various fields of applied science. This work is dedicated to the formation of neutron beams using the external 18-MeV proton beam of IBA cyclotron C18/18 with a beam current of up to 100 µA. The facility is located at the A. Alikhanyan National Science Laboratory (Yerevan Physics Institute). The possibility to obtain thermal or epithermal neutron beams using the external proton beam of the cyclotron is studied using Geant4 simulations. In this case, a quasimonoenergetic neutron source 9Be (p, n)9B reaction is chosen. As a result of the simulations, the optimal thickness of the 9Be beryllium isotope target is determined. The induced neutron beam is accompanied by a gamma ray background. To decrease the number of accompanying gamma rays, the lead absorber is considered. As a method of separating neutrons from gamma rays, the pulse shape discrimination (PSD) technique is developed. This study shows the possibility of neutron-gamma PSD and its applicability using the EJ-299-33A plastic scintillator.

scholarly journals Initial experimental verification of the neutron beam modeling for the LBNL BNCT facility

1999 ◽  
Author(s):  
D. L. Bleuel ◽  
W. T. Chu ◽  
R. J. Donahue ◽  
B. A. Ludewigt ◽  
R. J. McDonald ◽  
...  
Keyword(s):  
Neutron Beam ◽  
Experimental Verification ◽  
Beam Modeling

scholarly journals Characterization of Neutron Beam Applications

2020 ◽  
Vol 231 ◽  
pp. 05005
Author(s):  
Hirohiko M. Shimizu ◽  
Katsuya Hirota
Keyword(s):  
Neutron Scattering ◽  
Neutron Beam ◽  
Slow Neutron ◽  
Analytic Framework ◽  
Neutron Beams ◽  
Ongoing Effort

Analytic framework to quantitatively evaluate the performance of existing neutron scattering instruments would be valuable to find out new possibilities and potentials of slow neutron beams. A conceptual sketch of ongoing effort in Japan is described.

scholarly journals Neutron Beam Characterization at Neutron Radiography (NRAD) Reactor East Beam Following Reactor Modifications

2021 ◽  
Vol 5 (2) ◽  
pp. 8
Author(s):  
Sam H. Giegel ◽  
Aaron E. Craft ◽  
Glen C. Papaioannou ◽  
Andrew T. Smolinski ◽  
Chad L. Pope
Keyword(s):  
Energy Spectrum ◽  
Neutron Flux ◽  
Neutron Beam ◽  
Neutron Energy ◽  
Neutron Radiography ◽  
Neutron Energy Spectrum ◽  
Neutron Beams ◽  
Cadmium Ratio ◽  
Foil Activation

The Neutron Radiography Reactor at Idaho National Laboratory (INL) has two beamlines extending radially outward from the east and north faces of the reactor core. The control rod withdrawal procedure has recently been altered, potentially changing power distribution of the reactor and thus the properties of the neutron beams, calling for characterization of the neutron beams. The characterization of the East Radiography Station involved experiments used to measure the following characteristics: Neutron flux, neutron beam uniformity, cadmium ratio, image quality, and the neutron energy spectrum. The ERS is a Category-I neutron radiography facility signifying it has the highest possible rank a radiography station can achieve. The thermal equivalent neutron flux was measured using gold foil activation and determined to be 9.61 × 106 ± 2.47 × 105 n/cm2-s with a relatively uniform profile across the image plane. The cadmium ratio measurement was performed using bare and cadmium-covered gold foils and measured to be 2.05 ± 2.9%, indicating large epithermal and fast neutron content in the beam. The neutron energy spectrum was measured using foil activation coupled with unfolding algorithms provided by the software package Unfolding with MAXED and GRAVEL (UMG). The Monte-Carlo N-Particle (MCNP6) transport code was used to assist with the unfolding process. UMG, MCNP6, and measured foil activities were used to determine a neutron energy spectrum which was implemented into the MCNP6 model of the east neutron beam to contribute to future studies.

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