scholarly journals Can We Extract Production Cross-Sections from Thick Target Yield Measurements? A Case Study Using Scandium Radioisotopes

Instruments ◽  
2019 ◽  
Vol 3 (2) ◽  
pp. 29 ◽  
Author(s):  
Mateusz Sitarz ◽  
Jerzy Jastrzębski ◽  
Férid Haddad ◽  
Tomasz Matulewicz ◽  
Katarzyna Szkliniarz ◽  
...  
Keyword(s):  
Cross Section ◽  
Cross Sections ◽  
Production Cross ◽  
Thick Target ◽  
Cross Section Data ◽  
Thick Target Yield ◽  
Section Data ◽  
Target Yield ◽  
Data Points

In this work, we present an attempt to estimate the reaction excitation function based on the measurements of thick target yield. We fit a function to experimental data points and then use three fitting parameters to calculate the cross-section. We applied our approach to 43Ca(p,n)43Sc, 44Ca(p,n)44gSc, 44Ca(p,n)44mSc, 48Ca(p,2n)47Sc and 48Ca(p,n)48Sc reactions. A general agreement was observed between the reconstructions and the available cross-section data. The algorithm described here can be used to roughly estimate cross-section values, but it requires improvements.

scholarly journals Dissociative Ionisation and Neutral Dissociation: CF4, a Case Study

1992 ◽  
Vol 45 (3) ◽  
pp. 317 ◽  
Author(s):  
RA Bonham ◽  
MR Bruce
Keyword(s):  
Electron Impact ◽  
Cross Section ◽  
Production Cross Section ◽  
Production Cross ◽  
Cross Section Data ◽  
Section Data ◽  
Dissociation Cross Section ◽  
Order Of Magnitude ◽  
Impact Energies

New results for the total neutral dissociation cross section and an estimate of the gross cross section for the production of neutral fluorine by electron impact on CF4 have been obtained by combining previously reported results for the total dissociation cross section and the counting cross section for the total dissociative ionisation. This advancement was made possible by recently reported results for multication formation obtained from coincidence experiments. The estimate of the neutral fluorine production cross section is of the same order of magnitude as the total dissociation cross section itself, a similarity which may explain why CF4 is such an effective etching gas. The available cross section data for electron impact energies between 5 and 200 e V are reviewed.

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%.

scholarly journals Cross section and reaction rate of determined from thick target yield measurements

2014 ◽  
Vol 922 ◽  
pp. 112-125 ◽  
Author(s):  
Gy. Gyürky ◽  
M. Vakulenko ◽  
Zs. Fülöp ◽  
Z. Halász ◽  
G.G. Kiss ◽  
...  
Keyword(s):  
Cross Section ◽  
Reaction Rate ◽  
Thick Target ◽  
Thick Target Yield ◽  
Target Yield

scholarly journals Production Cross-Section Measurements for Terbium Radionuclides of Medical Interest Produced in Tantalum Targets Irradiated by 0.3 to 1.7 GeV Protons and Corresponding Thick Target Yield Calculations

2021 ◽  
Vol 8 ◽  
Author(s):  
Charlotte Duchemin ◽  
Thomas E. Cocolios ◽  
Kristof Dockx ◽  
Gregory J. Farooq-Smith ◽  
Olaf Felden ◽  
...  
Keyword(s):  
Cross Sections ◽  
Production Cross ◽  
Thick Target ◽  
Mass Separation ◽  
High Purity Germanium ◽  
Spallation Reactions ◽  
Target Yield ◽  
Target Production ◽  
Γ Spectrometry ◽  
Medical Interest

This work presents the production cross-sections of Ce, Tb and Dy radionuclides produced by 300 MeV to 1.7 GeV proton-induced spallation reactions in thin tantalum targets as well as the related Thick Target production Yield (TTY) values and ratios. The motivation is to optimise the production of terbium radionuclides for medical applications and to find out at which energy the purity of the collection by mass separation would be highest. For that purpose, activation experiments were performed using the COSY synchrotron at FZ Jülich utilising the stacked-foils technique and γ spectrometry with high-purity germanium detectors. The Al-27(p,x)Na-24 reaction has been used as monitor reaction. All experimental data have been systematically compared with the existing literature.

scholarly journals Spatial Non-uniformity in Discharges in Low Pressure Helium and Neon

1987 ◽  
Vol 40 (3) ◽  
pp. 383 ◽  
Author(s):  
J Fletcher ◽  
PH Purdie
Keyword(s):  
Monte Carlo Simulation ◽  
Cross Section ◽  
Cross Sections ◽  
Ground State ◽  
Low Pressure ◽  
Photon Flux ◽  
Cross Section Data ◽  
Section Data ◽  
Neon Gas ◽  
Wavelength Distribution

Low current, low pressure, steady state Townsend discharges in helium and neon gas have been investigated using the photon flux technique. Such discharges have been found to exhibit spatial non-uniformity resulting in luminous layers throughout the discharge. The separation and structure of these layers has been investigated experimentally in both gases along with the wavelength distribution of the photon flux. A Monte Carlo simulation of the discharge in neon has been used to gain information on the cross sections necessary to describe these discharges. It is found that direct excitaton of ground state atoms to the resonance level of each gas is less than indicated by some published cross section data.

Calculation of Line Broadening Cross Sections for Level Crossing Experiments in Alkali-Rare Gas Systems

1974 ◽  
Vol 29 (4) ◽  
pp. 605-609
Author(s):  
B. Grosswendt
Keyword(s):  
Cross Section ◽  
Cross Sections ◽  
Rare Gas ◽  
Atomic Interaction ◽  
Cross Section Data ◽  
Line Broadening ◽  
Crossing Experiments ◽  
Level Crossing ◽  
Section Data ◽  
Frame Work

Using a simple approximation for the theoretical atomic interaction constants cross section data for level crossing and Hanle-effect line broadening experiments in Rb, Mg+ and Ca+ rare gas systems could be derived. It is shown that in the Rb system the interaction C6R-6 is predominant and that the results are little influenced by dipole-quadrupole and repulsive interactions in the frame work of the Lindholm-Foley-Hindmarsh theory.

Triple differential cross sections for the ionization of helium by intermediate-energy electrons

1988 ◽  
Vol 66 (1) ◽  
pp. 82-85
Author(s):  
K. S. Baliyan ◽  
M. K. Srivastava
Keyword(s):  
Cross Section ◽  
Cross Sections ◽  
Differential Cross ◽  
Intermediate Energy ◽  
Incident Electron Energy ◽  
Cross Section Data ◽  
Satisfactory Description ◽  
Triple Differential Cross Section ◽  
Section Data ◽  
Better Than

The recent triple differential cross-section data of Jung for the ionization of helium in the coplanar asymmetric geometry at 250 eV incident electron energy is analyzed within the framework of the second Born (B2) and modified Glauber (MG) approximations. At this energy B2 and MG results, although better than those obtained by using the first Born and Glauber approximations, do not lead to a satisfactory description of the experimental data in all the kinematic situations considered here.

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