ON THE t(d, n)α REACTIVITY IN FUSION REACTORS

1989 ◽  
Vol 04 (22) ◽  
pp. 2101-2112 ◽  
Author(s):  
K. LANGANKE ◽  
C. ROLFS
Keyword(s):  
Energy Range ◽  
Cross Section ◽  
Thermal Equilibrium ◽  
Electron Screening ◽  
Fusion Reactors ◽  
Cross Section Data ◽  
Fermi Model ◽  
Thomas Fermi ◽  
Hartree Fock ◽  
Section Data

We argue that the most accurate t(d, n)α cross section data obtained by the Los Alamos group are enhanced at energies smaller than Ecm≈16 keV due to screening effects caused by the electrons present in the target. We show that these data in the energy range Ecm=16–70 keV can be well reproduced by a single Breit-Wigner resonance formula which, however, disagrees with the data at lower energies. Consistently the observed deviations can be associated with electron screening effects where the latter are estimated within the Thomas-Fermi model or a static Hartree-Fock approach. Adopting the present Breit-Wigner fit to the data at Ecm≥16 keV , we have calculated the reactivity of a d+t plasma at thermal equilibrium in the temperature range kT<10 keV as it might be important for future fusion reactors.

scholarly journals Measurements of the 33S (n, α)30Si cross-section at n_TOF and ILL: Implications in neutron capture therapy

2020 ◽  
Vol 239 ◽  
pp. 01020
Author(s):  
Javier Praena ◽  
Isabelópez-Casas L ◽  
Mariaé-Gilarte Sabat ◽  
Fernando de Saavedra Arias ◽  
Ignacio Porras
Keyword(s):  
Solar System ◽  
Energy Range ◽  
Dose Rate ◽  
Cross Section ◽  
Neutron Capture ◽  
High Energy ◽  
Neutron Capture Therapy ◽  
Cross Section Data ◽  
Section Data ◽  
Significant Resonance

Up to a couple of years ago, the 33S(n, α)30Si cross-section data had been limited and scarce. The origin in the solar system of 36S had been the only motivation to study that cross-section. However, a few years ago, the 33S(n, α)30Si reaction was proposed as a possible target in neutron capture therapy (NCT) due to the excellent bio-properties of 33S and the significant resonance at 13.45 keV of the cross-section for which a high-energy α is emitted. Prior to the experiments carried out at n_TOF-CERN and at the Institut Laue-Langevin (ILL) facilities, the data situation was: no data from the thermal point up to 10 keV; from 10 keV to 300 keV, there was only one (n, α) measurement able to resolve the resonances with a questionable value of the 13.45-keV resonance; and the thermal point did not have a consistent value. Here we summarize three experiments that have been performed covering the whole energy range of interest in NCT and astrophysics. These experiments have solved the most important issues. The data of the present work and the evaluated data are used to calculate the dose rate in the tissue.

Evaluation of nuclear reaction cross section data of proton and deuteron induced reactions on 75As, with particular emphasis on the production of 73Se

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Nouman Amjed ◽  
M. Naveed Aslam ◽  
Mazhar Hussain ◽  
Syed M. Qaim
Keyword(s):  
Energy Range ◽  
Cross Section ◽  
Cross Sections ◽  
Thick Target ◽  
Evaluation Methodology ◽  
Impurity Level ◽  
Nuclear Model ◽  
Cross Section Data ◽  
Section Data ◽  
Integral Yield

Abstract 75Se (T1/2 = 120 d), 73gSe (T1/2 = 7.1 h) and 72Se (T1/2 = 8.4 d) are important radioisotopes of selenium, being used in tracer studies, PET investigations and as a generator parent, respectively. Cross section data for the formation of those radionuclides in proton and deuteron induced reactions on 75As were critically analyzed up to about 70 MeV. A well-developed evaluation methodology was applied to generate the statistically fitted cross sections, based on the critically analyzed literature experimental data and the theoretical cross section values of three nuclear model codes ALICE-IPPE, TAYLS 1.9, and EMPIRE 3.2. Using the fitted cross sections the integral yield of each radionuclide was calculated. For the estimation of impurities, the integral yield of each radionuclide was compared with the yields of the other two radionuclides over a given energy region, and therefrom the energy range was suggested for the high purity production of each of the radionuclides 75Se, 73Se and 72Se. For production of the very important non-standard positron emitter 73Se via the 75As(p,3n)73Se reaction, the optimum energy range was deduced to be E p = 40 → 30 MeV, with a thick target yield of 1441 MBq/μAh and the 72,75Se impurity level of <0.1%.

Pooling of Time Series and Cross Section Data

Econometrica ◽  
1969 ◽  
Vol 37 (3) ◽  
pp. 552
Author(s):  
V. K. Chetty
Keyword(s):  
Time Series ◽  
Cross Section ◽  
Cross Section Data ◽  
Section Data

Applications of cross section data for nuclear geochemical well logging

1986 ◽  
Vol 94 (1-4) ◽  
pp. 49-52 ◽  
Author(s):  
R. C. Hertzog ◽  
P. D. Soran ◽  
J. S. Schweitzer
Keyword(s):  
Cross Section ◽  
Well Logging ◽  
Cross Section Data ◽  
Section Data ◽  
Geochemical Well Logging

An Am/Be neutron source and its use in integral tests of differential neutron reaction cross-section data

2010 ◽  
Vol 68 (9) ◽  
pp. 1656-1661 ◽  
Author(s):  
M.S. Uddin ◽  
M.R. Zaman ◽  
S.M. Hossain ◽  
I. Spahn ◽  
S. Sudár ◽  
...  
Keyword(s):  
Cross Section ◽  
Neutron Source ◽  
Reaction Cross Section ◽  
Reaction Cross ◽  
Cross Section Data ◽  
Section Data ◽  
Neutron Reaction

scholarly journals Unions and Productivity in the Public Sector: A Study of Municipal Libraries

ILR Review ◽  
1983 ◽  
Vol 36 (2) ◽  
pp. 199-213 ◽  
Author(s):  
Ronald G. Ehrenberg ◽  
Daniel R. Sherman ◽  
Joshua L. Schwarz
Keyword(s):  
Public Sector ◽  
Collective Bargaining ◽  
Empirical Analysis ◽  
Cross Section ◽  
Cross Section Data ◽  
The Public ◽  
Section Data ◽  
The Empirical Analysis

This paper develops and illustrates the use of two methodologies to analyze the effect of unions on productivity in the public sector. Although the methodologies are applicable to a wide variety of public sector functions, the focus of the paper is on municipal libraries because of the availability of relevant data. The empirical analysis, which uses 1977 cross-section data on 260 libraries, suggests that collective bargaining coverage has not significantly affected productivity in municipal libraries.

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