Measurements of neutron cross sections and isomeric cross section ratios in Se isotopes

1967 ◽  
Vol 100 (1) ◽  
pp. 186-190 ◽  
Author(s):  
B. Minetti ◽  
A. Pasquarelli
Keyword(s):  
Cross Section ◽  
Cross Sections ◽  
Neutron Cross Sections

The Thermal Neutron Cross Section and the Resonance Integral of 184Os, 190Os, 192Os, 64Zn, 68Zn and 59Co

1968 ◽  
Vol 9 (2-3) ◽  
Author(s):  
J. I. Kim ◽  
F. Adams
Keyword(s):  
Neutron Activation ◽  
Thermal Neutron ◽  
Cross Section ◽  
Cross Sections ◽  
Neutron Cross Section ◽  
Resonance Integral ◽  
Activation Measurement ◽  
Thermal Neutron Cross Section ◽  
Neutron Cross Sections

SummaryBy neutron activation measurement with a cadmium filter, using gold as a standard monitor, the thermal neutron cross sections and the resonance integrals of

A new empirical formula for cross-sections of (n,nα) reactions

2020 ◽  
Vol 29 (08) ◽  
pp. 2050062
Author(s):  
Mustafa Yiğit
Keyword(s):  
Cross Section ◽  
Cross Sections ◽  
Empirical Formula ◽  
Nuclear Reactions ◽  
Measured Cross Section ◽  
Future Studies ◽  
Present Formalism ◽  
The Cross ◽  
Neutron Cross Sections ◽  
Good Agreement

Studies on the cross-sections of (n,n[Formula: see text]) reactions which are energetically possible, about 14 MeV neutrons are quite scarce. In this paper, the cross-sections of (n,n[Formula: see text] nuclear reactions at [Formula: see text]14–15 MeV are analyzed by using a new empirical formula based on the statistical theory. We show that neutron cross-sections are closely related to the [Formula: see text]-value of nuclear reaction, in particular for (n,n[Formula: see text]) channels. Results obtained with this empirical formula show good agreement with the available measured cross-section values. We hope that the estimations on the cross-sections using the present formalism may be helpful in future studies in this field.

Excitation Curves for the Reactions of Fast Neutrons with Zinc

1972 ◽  
Vol 50 (20) ◽  
pp. 2536-2548 ◽  
Author(s):  
D. C. Santry ◽  
J. P. Butler
Keyword(s):  
Neutron Flux ◽  
Cross Section ◽  
Cross Sections ◽  
Fission Neutron ◽  
Fast Neutrons ◽  
Factors Influencing ◽  
Fission Neutron Spectrum ◽  
Neutron Cross Sections ◽  
Threshold Energies ◽  
Measure Cross Section

The activation method was used to measure cross section values from threshold energies up to 20 MeV for the reactions 64Zn(n,p)64Cu, 68Zn(n,α)65Ni, and 70Zn(n,2n)69Znm. The neutron flux at energies below 5.3 MeV was determined with a calibrated neutron long counter while at higher energies measurements were made relative to the known cross section for the 32S(n,p)32P reaction. Effective cross sections for a fission-neutron spectrum calculated from measured excitation curves are 42.3 ± 2.1 mb for the (n,p) reaction, 0.035 ± 0.003 mb for the (n,α) reaction, and 0.45 ± 0.04 mb for the (n,2n) reaction. Factors influencing precise measurements of fast-neutron cross sections are discussed in detail.

The total neutron cross-sections of cobalt, silver, iodine, aluminium, nickel and gallium between 1 eV and 5 keV

1952 ◽  
Vol 215 (1121) ◽  
pp. 278-289 ◽  
Keyword(s):  
Total Cross Section ◽  
Cross Section ◽  
Cross Sections ◽  
Neutron Cross Section ◽  
Total Neutron ◽  
Total Neutron Cross Section ◽  
Energy Research ◽  
Main Interest ◽  
Neutron Time ◽  
Neutron Cross Sections

This paper presents experimental results of total neutron cross-section measurements made with a neutron time of flight spectrometer at the Atomic Energy Research Establishment, Harwell. Six elements, Co, Ag, I, Al, Ni and Ga, have so far been studied over the range of neutron energies from 1 eV to 5 keV. The main interest of the measurements lies in the use of improved resolution at the higher energies with the result that certain levels have now been more clearly resolved. The results are presented as curves showing the variation of total cross-section with neutron energy. For certain levels, the strength of the resonance is calculated. The spectrometer is briefly described and some reference made to previous work in the same field.

scholarly journals Setup for the measurement of the 235U(n, f) cross section relative to n-p scattering up to 1 GeV

2020 ◽  
Vol 239 ◽  
pp. 01008
Author(s):  
A. Manna ◽  
O. Aberle ◽  
V Alcayne ◽  
S. Amaducci ◽  
J. Andrzejewski ◽  
...  
Keyword(s):  
Cross Section ◽  
Cross Sections ◽  
Recoil Proton ◽  
High Energy ◽  
Section Data ◽  
Nuclear Systems ◽  
Biological Effectiveness ◽  
Induced Fission ◽  
Set Up ◽  
Neutron Cross Sections

The neutron induced fission of 235U is extensively used as a reference for neutron fluence measurements in various applications, ranging from the investigation of the biological effectiveness of high energy neutrons, to the measurement of high energy neutron cross sections of relevance for accelerator driven nuclear systems. Despite its widespread use, no data exist on neutron induced fission of 235U above 200 MeV. The neutron facility n_TOF offers the possibility to improve the situation. The measurement of 235U(n,f) relative to the differential n-p scattering cross-section, was carried out in September 2018 with the aim of providing accurate and precise cross section data in the energy range from 10 MeV up to 1 GeV. In such measurements, Recoil Proton Telescopes (RPTs) are used to measure the neutron flux while the fission events are detected and counted with dedicated detectors. In this paper the measurement campaign and the experimental set-up are illustrated.

scholarly journals Measurement of the 242Pu(n,f) cross-section at the CERN n_TOF facility

2019 ◽  
Vol 22 ◽  
pp. 28
Author(s):  
A. Tsinganis ◽  
E Berthoumieux ◽  
C. Guerrero ◽  
N. Colonna ◽  
M. Calviani ◽  
...  
Keyword(s):  
Cross Section ◽  
Cross Sections ◽  
Wide Energy Range ◽  
Minor Actinides ◽  
Theoretical Cross Section ◽  
Plutonium Isotopes ◽  
Nuclear Systems ◽  
Wide Energy ◽  
Neutron Cross Sections ◽  
Empire Code

Knowledge of neutron cross-sections of various plutonium isotopes and other minor actinides is crucial for the design of advanced nuclear systems. The 240,242Pu(n,f) cross-sections were measured at the CERN n_TOF facility, taking advantage of the wide energy range (from thermal to GeV) and the high instantaneous flux of the neutron beam. In this work, preliminary results are presented along with a theoretical cross-section calculation performed with the EMPIRE code.

THERMAL NEUTRON CROSS SECTIONS AND RESONANCE INTEGRALS OF THE REACTIONS O17(n,α)C14, Ar36(n,α)S33, AND N14(n,p)C14

1961 ◽  
Vol 39 (12) ◽  
pp. 1784-1806 ◽  
Author(s):  
G. C. Hanna ◽  
D. B. Primeau ◽  
P. R. Tunnicliffe
Keyword(s):  
Thermal Neutron ◽  
Cross Section ◽  
Heavy Water ◽  
Cross Sections ◽  
Ionization Chamber ◽  
Neutron Absorption ◽  
Activation Cross Section ◽  
Exothermic Reactions ◽  
Neutron Cross Sections ◽  
Chamber Technique

The thermal neutron cross sections of the exothermic reactions O17(n,α)C14, Ar36(n,α)S33, and N14(n,p)C14 have been measured, relative to the activation cross section of gold, by using a pulse ionization chamber technique. The results obtained are 0.235 ± 0.005 barn, 5.52 ± 0.11 millibarns, and 1.83 ± 0.03 barns respectively. All the reactions were shown to have the same cadmium ratio as the B10(n,α)Li7 reaction with accuracies of ±10%, ±40%, and ±3% respectively. The O17 result shows that capture in this nuclide contributes significantly to neutron absorption in heavy water.

Electron Irradiation Effects in Polyoxymethylene Crystals Grown Inside Trioxane Crystals

1971 ◽  
Vol 29 ◽  
pp. 78-79
Author(s):  
J. P. Colson ◽  
D. H. Reneker
Keyword(s):  
Cross Section ◽  
Cross Sections ◽  
Detailed Examination ◽  
The Other ◽  
Electron Micrograph ◽  
Irradiation Effects ◽  
Threefold Axis ◽  
Typical Sample ◽  
Polymer Crystals ◽  
Chain Axis

Polyoxymethylene (POM) crystals grow inside trioxane crystals which have been irradiated and heated to a temperature slightly below their melting point. Figure 1 shows a low magnification electron micrograph of a group of such POM crystals. Detailed examination at higher magnification showed that three distinct types of POM crystals grew in a typical sample. The three types of POM crystals were distinguished by the direction that the polymer chain axis in each crystal made with respect to the threefold axis of the trioxane crystal. These polyoxymethylene crystals were described previously.At low magnifications the three types of polymer crystals appeared as slender rods. One type had a hexagonal cross section and the other two types had rectangular cross sections, that is, they were ribbonlike.

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