scholarly journals Comparison of deep underground neutron flux measured with a helium-3 filled proportional counter and evaluated from element composition or isotopic ratio of 36Cl/Cl in granite rock

2011 ◽  
Vol 1 (1) ◽  
pp. 227-232
Author(s):  
T. Kubota ◽  
T. Ohta ◽  
Y. Mahara ◽  
A. Kudo
Keyword(s):  
Neutron Flux ◽  
Thermal Neutron ◽  
Elemental Composition ◽  
Proportional Counter ◽  
Thermal Neutron Flux ◽  
Isotopic Ratio ◽  
Deep Underground ◽  
Helium 3 ◽  
Good Agreement

Abstract The chlorine isotopic ratio and elemental composition of two granite cores collected in a deep underground tunnel has been measured; neutrons were detected using a helium-3-filled proportional counter placed in a borehole. The thermal neutron flux determined from the chlorine isotopic ratio from accelerator mass spectrometry is (3.8 ± 0.2) × 10−5 and that determined from the granite's elemental composition is (4.4 ± 0.3) × 10−5(cm−2 s−1). The results of in-situ measurements using the proportional counter yielded a thermal neutron flux value of (3.3 ± 0.1) × 10−5(cm−2 s−1). This good agreement among the results shows the validity of the neutron flux evaluation obtained from the elemental composition and/or the isotopic ratio of 36Cl/Cl. Further, it reveals that the neutron flux in the underground environment remains stable for at least one million years, i.e., the period over which chlorine-36 attains equilibrium.

scholarly journals Neutrons production on the IPHI accelerator for the validation of the design of the compact neutron source SONATE

2020 ◽  
Vol 231 ◽  
pp. 01007
Author(s):  
Hoang Ngoc Tran ◽  
Frédéric Ott ◽  
Jacques Darpentigny ◽  
Anthony Marchix ◽  
Alain Letourneau ◽  
...  
Keyword(s):  
Monte Carlo ◽  
Monte Carlo Simulations ◽  
Neutron Flux ◽  
Neutron Scattering ◽  
Thermal Neutron ◽  
Neutron Source ◽  
Thermal Neutron Flux ◽  
Gold Foil ◽  
Proton Accelerator ◽  
Good Agreement

We aim at building a compact accelerator-based neutron source (CANS) which would provide a thermal neutron flux on the order of 4x1012 n.s-1.cm-2.sr-1. Such a brilliance would put compact neutron sources on par with existing medium flux neutron research reactors for neutron scattering experiments. We performed the first neutron production tests on the IPHI proton accelerator at Saclay at a proton energy of 3 MeV. The thermal neutron flux were measured using gold foil activation and 3He detectors. The measured flux were compared with GEANT4 Monte Carlo simulations (10.4) in which the whole experimental setup was modelled. There is a good agreement between the experimental measurements and the Monte-Carlo simulations. The available modelling tools will allow us to optimize the whole Target Moderator Reflector assembly together with the neutron scattering spectrometer geometries for the design of the neutron scattering facility SONATE.

scholarly journals The study of the thermal neutron flux in the deep underground laboratory DULB-4900

2017 ◽  
Vol 48 (1) ◽  
pp. 34-37 ◽  
Author(s):  
V. V. Alekseenko ◽  
Yu. M. Gavrilyuk ◽  
A. M. Gangapshev ◽  
A. M. Gezhaev ◽  
D. D. Dzhappuev ◽  
...  
Keyword(s):  
Neutron Flux ◽  
Thermal Neutron ◽  
Thermal Neutron Flux ◽  
Underground Laboratory ◽  
Deep Underground

scholarly journals Multiplication of Fast Neutrons Source Flux by Using Deuterium-Helium-3 Plasma

2013 ◽  
Vol 2013 ◽  
pp. 1-4 ◽  
Author(s):  
Mohammad Mahdavi ◽  
Maryam Shahbahrami
Keyword(s):  
Energy Loss ◽  
Neutron Flux ◽  
Thermal Neutron ◽  
Loss Rate ◽  
Thermal Neutron Flux ◽  
Fast Neutrons ◽  
Physical Parameters ◽  
Neutron Absorption ◽  
Absorption Length ◽  
Helium 3

The production of fast neutrons source is examined by using a thermal neutron flux inside plasma. In order to reach a favorable yield of fast neutrons flux, the parameters such as energy loss rate, reaction probability, and neutron absorption length are calculated. The nuclear conversion efficiency, , of thermal neutron to fast neutrons is obtained to be by calculating the physical parameters for the plasma designed.

scholarly journals Practical, visible wavelength nuclear-pumped laser

1993 ◽  
Vol 11 (3) ◽  
pp. 559-566 ◽  
Author(s):  
Y.R. Shaban ◽  
G.H. Miley
Keyword(s):  
Neutron Flux ◽  
Thermal Neutron ◽  
Thermal Neutron Flux ◽  
Visible Region ◽  
Laser Cavity ◽  
Pumping Power ◽  
University Of Illinois ◽  
Triga Reactor ◽  
Visible Wavelength ◽  
The University

A practical, visible nuclear-pumped laser (NPL) has been sought at the University of Illinois and other laboratories for a number of years. Yet, the results from successful visible NPLs to date have not been fully satisfactory, e.g., the threshold pumping power is too high for conventional applications. Progress in recent studies of 3He-Ne-H2 as a candidate NPL operating in the visible region at 585.3 nm on the 2P1,-1S2 Ne transition is described. We obtained lasing on the above transition for 3He-Ne-H2 concentrations of 1,140, 588, and 412 torr, respectively, with the laser cavity placed in the beamport of the University of Illinois TRIGA reactor. The threshold thermal neutron flux is 1014 n/cm2-s, corresponding to a threshold pumping power of 5 W/cm3.

Thermal neutron flux characterization at aircraft altitudes with the TinMan detector

2017 ◽  
Author(s):  
Suzanne Nowicki ◽  
Stephen Wender ◽  
Aaron Couture ◽  
Laura Dominik ◽  
Adam Warniment ◽  
...  
Keyword(s):  
Neutron Flux ◽  
Thermal Neutron ◽  
Thermal Neutron Flux ◽  
Neutron Flux Characterization
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