Measurement of neutron spectra in the energy range up to 3 keV by resonance indicators

1966 ◽  
Vol 20 (6) ◽  
pp. 600-602
Author(s):  
A. V. Zvonarev ◽  
Yu. F. Koleganov ◽  
F. F. Mikhailus ◽  
M. N. Nikolaev
Keyword(s):  
Energy Range ◽  
Neutron Spectra

Serpent 2 Validation for Radiation Shielding Applications

2021 ◽  
Author(s):  
Silja Häkkinen
Keyword(s):  
Energy Range ◽  
Radiation Shielding ◽  
Photon Flux ◽  
Photon Transport ◽  
Neutron Spectra ◽  
Measurement Results ◽  
Photon Spectra

Abstract This paper contributes to the validation of Serpent's photon transport and coupled neutron-photon transport routines. Two benhmarks presenting measurements of neutron and photon flux through different sized iron and lead spheres have been calculated using a development version of Serpent and MCNP6.2. The Serpent results were compared to the measurement results and the MCNP6.2 calculations. Additionally, the development version has been compared to the currently distributed Serpent version 2.1.31. In all cases, the Serpent calculated neutron and photon spectra followed the measured spectra fairly well. For the iron spheres, differences between Serpent and MCNP6.2 calculated neutron spectra were mostly below 2 % at neutron energies below 4 MeV. Differences between photon spectra through the iron spheres were mostly below 3 %. For the lead spheres, differences in the calculated neutron spectra were mostly below 1.5 % in the energy range 0.04-4.0 MeV. Differences between photon spectra through the 10 cm lead sphere were mostly below 5 % and for the larger spheres below 10 % except at higher photon energies above 6.5 MeV. Differences between the development version and the Serpent version 2.1.31 of the order of 3 % were observed in the photon spectra through the largest lead spheres with radius 20 and 30 cm when Gaussian Energy Broadening was not applied. These are probably related to the coupled neutron-photon transport routines in the different versions.

scholarly journals Two absolute integral measurements of the 197Au(n,γ) stellar cross-section and solution of the historic discrepancies

2020 ◽  
Vol 239 ◽  
pp. 19002
Author(s):  
Javier Praena ◽  
Pablo Jiménez-Bonilla
Keyword(s):  
Energy Range ◽  
Cross Section ◽  
Neutron Capture ◽  
Capture Cross Section ◽  
New Method ◽  
Capture Cross ◽  
Neutron Capture Cross Section ◽  
Neutron Spectra

The Maxwellian averaged cross section (MACS) for 197Au(n,γ) is used in neutron capture cross section measurements as a reference for reactions important for astrophysics, reactor and dosimetry applications. The traditionally adopted value for this reference cross section, in the energy range relevant for astrophysical (3 < E n < 200 keV), was obtained by Ratynski and Käppeler in 1988. However, the MACS calculated using the 2006 standards evaluation is approximately 6 % above the Ratynski and Käppeler (R&K) evaluation. Because of this discrepancy new experiments and reanalyses were done in an attempt to resolve the problem. In 2011 we started as well a series of integral experiments (activation) for determining the MACS-30 (kT=30 keV) of Au with two different Maxwellian neutron spectra: i) QMNS-25 (as R&K) and ii) MNS-30 (new method). Our results agree with those obtained with the standard evaluation. At present (2018), the updated MACS-30 has been included as standard. Here we present the results of our measurements and the reasons for the lower value of the R&K measurement.

Real-time measurement of low-energy-range neutron spectra on board the space shuttle STS-89 (S/MM-8)

2001 ◽  
Vol 33 (3) ◽  
pp. 321-333 ◽  
Author(s):  
H. Matsumoto ◽  
T. Goka ◽  
K. Koga ◽  
S. Iwai ◽  
T. Uehara ◽  
...  
Keyword(s):  
Energy Range ◽  
Real Time ◽  
Space Shuttle ◽  
Time Measurement ◽  
Low Energy ◽  
Neutron Spectra ◽  
Real Time Measurement

scholarly journals Simulation of neutron production in hadron-nucleus and nucleus-nucleus interactions in Geant4

2019 ◽  
Vol 204 ◽  
pp. 03004
Author(s):  
Aida Galoyan ◽  
Alberto Ribon ◽  
Vladimir Uzhinsky
Keyword(s):  
Experimental Data ◽  
Energy Range ◽  
Collision Energy ◽  
Asymptotic Properties ◽  
Slow Neutron ◽  
Neutron Production ◽  
Projectile Energy ◽  
Neutron Spectra ◽  
High Energies ◽  
Very High

Studying experimental data obtained at ITEP [1] on neutron production in interactions of protons with various nuclei in the energy range from 747 MeV up to 8.1 GeV, we have found that slow neutron spectra have scaling and asymptotic properties [2]. The spectra weakly depend on the collision energy at momenta of projectile protons larger than 5 – 6 GeV/c. These properties are taken into account in the Geant4 Fritiof (FTF) model. The improved FTF model describes as well as the Geant4 Bertini model the experimental data on neutron production by 1.2 GeV and 1.6 GeV protons on targets (Fe, Pb) [3] and by 3.0 GeV protons on various targets (Al, Fe, Pb) [4]. For neutron production in antiproton-nucleus interactions, it is demonstrated that the FTF results are in a satisfactory agreement with experimental data of the LEAR collaboration [5]. The FTF model gives promising results for neutron production in nucleus - nucleus interactions at projectile energy 1 – 2 GeV per nucleon [6]. The observed properties allow one to predict neutron yields in the nucleus-nucleus interactions at high and very high energies. Predictions for the NICA/MPD experiment at JINR are presented.

Solar Flare Energetic Neutral Emission Measurements in the Project Coronas-I

1994 ◽  
Vol 144 ◽  
pp. 635-639
Author(s):  
J. Baláž ◽  
A. V. Dmitriev ◽  
M. A. Kovalevskaya ◽  
K. Kudela ◽  
S. N. Kuznetsov ◽  
...  
Keyword(s):  
Solar Flare ◽  
Energy Range ◽  
Gamma Rays ◽  
Pulse Shape ◽  
Gamma Ray ◽  
Pulse Shape Discrimination ◽  
Shape Discrimination ◽  
Solar Neutron ◽  
Low Altitude

AbstractThe experiment SONG (SOlar Neutron and Gamma rays) for the low altitude satellite CORONAS-I is described. The instrument is capable to provide gamma-ray line and continuum detection in the energy range 0.1 – 100 MeV as well as detection of neutrons with energies above 30 MeV. As a by-product, the electrons in the range 11 – 108 MeV will be measured too. The pulse shape discrimination technique (PSD) is used.

L X-RAY FLUORESCENCE CROSS-SECTIONS MEASUREMENTS FOR ELEMENTS 56≤Z≤66 IN THE ENERGY RANGE 11-41 keV

1987 ◽  
Vol 48 (C9) ◽  
pp. C8-669-C8-672 ◽  
Author(s):  
S. SINGH ◽  
S. KUMAR ◽  
D. MEHTA ◽  
M. L. GARG ◽  
N. SINGH ◽  
...  
Keyword(s):  
Energy Range ◽  
Cross Sections ◽  
X Ray
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