Possibility of neglecting elastic scattering in calculating the velocities of nuclear reactions in a uniform sphere

1972 ◽  
Vol 32 (6) ◽  
pp. 560-562
Author(s):  
V. K. Kapyshev ◽  
V. I. Sakharov
Keyword(s):  
Elastic Scattering ◽  
Nuclear Reactions ◽  
Uniform Sphere

scholarly journals NUCLEAR MEAN-FIELD DESCRIPTION OF PROTON ELASTIC SCATTERING BY 12,13 C AT LOW ENERGIES

2020 ◽  
Vol 31 (1) ◽  
Author(s):  
Huan Nhut Phan
Keyword(s):  
Elastic Scattering ◽  
Cross Sections ◽  
Nuclear Reactions ◽  
Mean Field ◽  
Nuclear Astrophysics ◽  
Nucleon Nucleon ◽  
Light Nuclei ◽  
Intermediate Energies ◽  
Proton Elastic Scattering ◽  
Low Energies

Nuclear reactions of proton by light nuclei at low energies play a key role in the study ofnucleosynthesis which is of interest in nuclear astrophysics. The most fundamental process whichis very necessary is the elastic scattering. In this work, we construct a microscopic proton-nucleuspotential in order to describe the differential cross-sections over scattering angles of the protonelastic scattering by 12C and 13C in the range of available energies 14 - 22 MeV. The microscopicoptical potential is based on the folding model using the effective nucleon-nucleon interactionCDM3Yn. The results show the promising use of the CDM3Yn interactions at low and very lowenergies, which were originally used for nuclear reactions at intermediate energies. This could bethe premise for the study of nuclear reactions using CDM3Yn interaction in astrophysics at lowenergies.

Analysis with SDHO and RMF density distributions of elastic scattering cross-sections of oxygen isotopes (16–18O) by various target nuclei

2018 ◽  
Vol 27 (07) ◽  
pp. 1850055 ◽  
Author(s):  
M. Aygun
Keyword(s):  
Elastic Scattering ◽  
Oxygen Isotopes ◽  
Cross Sections ◽  
Nuclear Reactions ◽  
Mean Field ◽  
Relativistic Mean Field ◽  
Density Distributions ◽  
Scattering Cross ◽  
Double Folding ◽  
Scattering Cross Sections

In the present study, two different density distributions of oxygen isotopes ([Formula: see text]O) that consist of the harmonic oscillator single-particle wave functions (SDHO) and the relativistic mean-field (RMF) approaches are investigated for the availability of elastic scattering cross-sections. For this purpose, the elastic scattering angular distributions of nuclear reactions with 13 target nuclei, four target nuclei and nine target nuclei are calculated for [Formula: see text]O, [Formula: see text]O and [Formula: see text]O, respectively. For these calculations, the double folding model based on the optical model is used. The optical potential parameters, volume integrals and cross-sections for all the nuclear reactions are given in this study. The comparison of theoretical results and experimental data shows very good agreement. The imaginary potential depth expressions, which will be new and more practical terms to explain the nuclear interactions of [Formula: see text]O, [Formula: see text]O and [Formula: see text]O with different nuclei, for each oxygen isotope are proposed.

Computer Simulation and Depth Profiling of Light Nuclei by Nuclear Techniques

2010 ◽  
Vol 107 ◽  
pp. 123-128 ◽  
Author(s):  
J.A.R. Pacheco de Carvalho ◽  
C.F.F.P.R. Pacheco ◽  
A.D. Reis
Keyword(s):  
Computer Simulation ◽  
Elastic Scattering ◽  
Nuclear Reactions ◽  
Depth Profiling ◽  
Thick Target ◽  
Light Nuclei ◽  
Target Composition ◽  
Nuclear Techniques ◽  
Non Destructive

This article involves computer simulation and surface analysis by nuclear techniques, which are non-destructive. The “energy method of analysis” for nuclear reactions and elastic scattering is used. Energy spectra are computer simulated and compared with experimental data, giving target composition and concentration profile information. The method is successfully applied to depth profiling of 18O and 12C nuclei in thick targets through the 18O(p,α0)15N and 12C(d,p0)13C reactions, respectively. Similarly, elastic scattering of (4He)+ ions is applied to determination of concentration profiles of O and Al for a thick target containing a thin film of aluminium oxide.

scholarly journals Applications of Nuclear Techniques and Microscopy to Surface Analysis of Materials

2008 ◽  
Vol 14 (S3) ◽  
pp. 71-72
Author(s):  
José A.R. Pacheco de Carvalho ◽  
António D. Reis
Keyword(s):  
Experimental Data ◽  
Elastic Scattering ◽  
Surface Analysis ◽  
Goodness Of Fit ◽  
Nuclear Reactions ◽  
Ion Beam ◽  
Concentration Profiles ◽  
Detector Resolution ◽  
Target Composition ◽  
Nuclear Techniques

The importance of surface analysis of materials has been increasing. The available techniques are complementary. Nuclear techniques, which are non-destructive, provide analysis for a few microns near the surface. Using low energy ion beams of a few MeV, applications have been made to several areas. Nuclear reactions and elastic scattering are the more precise nuclear techniques for obtaining absolute values of concentrations in surface analysis. Nuclear reactions provide, not only high sensitivities for detection of light elements in heavy substrates, but also discrimination of isotopes. We consider the “energy analysis method”, where a spectrum is acquired of ions from the target for a single energy of an incident ion beam. The spectrum inherently contains target composition and concentration profile information. A computational procedure has been developed for predicting such energy spectra, where elastic scattering is a particular and important case. The model mainly accounts for: target parameters, such as composition and concentration profiles; energy spread of the incident ion beam; geometric factors and target rotation; stopping power; differential cross section; energy straggling; detector resolution. An option permits inclusion of effects such as: multiple scattering; incident beam size and angular divergence; detector angular aperture. Computer simulated spectra are compared to experimental data. The chi-square is calculated, to evaluate the goodness of fit. Through variation of target parameters, so as to fit experimental data, target composition and concentration profiles are obtained.

scholarly journals Analysis of Overlapping Resonances in Proton?Carbon Scattering

1963 ◽  
Vol 16 (3) ◽  
pp. 370 ◽  
Author(s):  
D Robson ◽  
W Toutenhoofd
Keyword(s):  
Elastic Scattering ◽  
Energy Range ◽  
Nuclear Reactions ◽  
Matrix Theory ◽  
Polarization Data ◽  
Excitation Functions ◽  
R Matrix ◽  
Close Fit

The R-matrix theory of nuclear reactions is discussed for the situation where distant levels must be included and is successfully applied to the elastic scattering of protons by l2C in the energy range ELAB = 10-11� 5 MeV, where the resonance levels are overlapping. Definite spin and parity assignments are made for three levels in this region by comparing the predicted excitation functions at several angles of scattering with experiment. Previously unexplained polarization data are explained by this analysis. The optical.model potential is found to be parity dependent for ELAB=8.5 MeV and yields a close fit to the available data at ELAB = 8�5 MeV.

scholarly journals Applications of Nuclear Techniques, Computer Simulation and Microscopy to Surface Analysis of Materials

2013 ◽  
Vol 19 (S4) ◽  
pp. 133-134 ◽  
Author(s):  
J. Pacheco de Carvalho ◽  
C.F.R. Pacheco ◽  
A.D. Reis
Keyword(s):  
Elastic Scattering ◽  
Oxide Film ◽  
Film Thickness ◽  
Surface Analysis ◽  
Concentration Profile ◽  
Nuclear Reactions ◽  
Ammonium Citrate ◽  
Oxide Film Thickness ◽  
Nuclear Techniques ◽  
Sem And Tem

There is a wide range of surface analysis techniques which are, generally, complementary. Nuclear and non-nuclear techniques have been available. Nuclear techniques, which are non-destructive, provide for analysis over a few microns close to the surface of the sample, giving absolute values of concentrations of isotopes and elements. They have been applied in areas such as scientific, technologic, industry, arts and medicine, using MeV ion beams. Nuclear reactions permit tracing of isotopes with high sensitivities. We use ion-ion nuclear reactions, elastic scattering and the energy analysis method where, at a chosen energy of the incident ion beam, an energy spectrum is recorded of ions from nuclear events, coming from several depths in the target. Such spectra are computationally predicted, giving target composition and concentration profile information. A computer program has been developed in this context, mainly for flat targets. The non-flat target situation arises as an extension. Successful applications of the method are given using the 18O(p,α0)15N reaction and elastic scattering of (4He)+ ions. SEM and TEM are used as useful complementary techniques.Two types of samples were prepared containing thick and thin oxides, respectively. The first sample (S1) was obtained by high temperature oxidation of austenitic steel in C 18O2 gas. Weight gain measurements had given a 4.2 μm thick oxide. SEM has shown a reasonably flat oxide (Figure 1 (a)). The second sample (S2, also labelled Al/Al2O3) was obtained by anodization of high purity aluminium at 100V in an aqueous solution of ammonium citrate. An oxide thickness of 0.1370 μm was expected. TEM has given an oxide film thickness of 0.1340 μm (Figure 1 (b)). The 18O(p,α0)15N reaction at Ep=1.78 MeV and 165º was used to analyse sample S1. Figure 2 (a) shows a good computed fit to data. A 18O step concentration profile was found, corresponding to a thick 18O oxide with thickness X1=4.4 μm. Sample S2 was analysed by elastic scattering of α particles at Eα=2.0 MeV and 165º. Figure 2 (b) shows a good computed fit to data. A thin oxide film thickness of X1=0.1350 μm was found, close to the TEM value. The fit also shows a ratio of atomic densities of O and Al slightly above 1.5. The combined use of nuclear techniques, SEM and TEM microscopy has proved to be very important for surface analysis of materials. The reported results would be difficult to obtain by other techniques.Supports from University of Beira Interior and FCT (Fundação para a Ciência e a Tecnologia)/PEst-OE/FIS/UI0524/2011 (Projecto Estratégico-UI524-2011-2012) are acknowledged.

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