Elastic Scattering of 152Eu ? Rays by Tungsten

1981 ◽  
Vol 34 (2) ◽  
pp. 125 ◽  
Author(s):  
RB Taylor ◽  
P Teansomprasong ◽  
IB Whittingham
Keyword(s):  
Form Factor ◽  
Elastic Scattering ◽  
Cross Sections ◽  
Differential Cross ◽  
Dirac Point ◽  
Experimental Results ◽  
Large Momentum ◽  
Small Momentum ◽  
Hartree Fock ◽  
The Difference

Differential cross sections for the elastic scattering of 344, 444, 779, 964, 1086, 1112 and 1408 keY y rays by tungsten have been measured for six scattering angles ranging from 7� to 45� and are compared with theoretical cross sections for Rayleigh plus nuclear-Thomson plus, for the 1408 keY case, Delbriick scattering. For small momentum transfers the experimental results are in best agreement with cross sections computed using the Hartree-Fock form factor Rayleigh amplitudes, but at large momentum transfers the experimental results lie below these theoretical cross sections and also those computed using both the 'exact' Rayleigh amplitudes of Kissel and Pratt and the Dirac point-Coulomb form factor amplitudes. Inclusion of the Papatzacos and Mork Delbruck amplitudes at 1408 keY reduces the difference between experimental and theoretical cross sections for scattering angles less than 25�, but worsens the situation for larger angles.:

Scattering of Ions V. Elastic Scattering of the Symmetric Rare Gas Ion — Rare Gas Atom Systems

1974 ◽  
Vol 29 (3) ◽  
pp. 400-410 ◽  
Author(s):  
H.-U. Mittmann ◽  
H.-P. Weise
Keyword(s):  
Elastic Scattering ◽  
Cross Sections ◽  
Differential Cross ◽  
Energy Difference ◽  
Rare Gas ◽  
Rare Gas Atoms ◽  
Structure Splitting ◽  
The Difference ◽  
Interference Oscillations ◽  
Single Set

Differential cross-sections for the elastic scattering of Ne+ on Ne, Ar+ on Ar, Kr+ on Kr, and Xe+ on Xe have been measured. In the lab.-energy range from 3 eV up to 30 eV a rainbow maximum was observed and attributed to the attractive ground state potentials of these systems. From the angular positions of the primary rainbows the potential depths were derived. In the case of Ne2+ and Ar2+ these values are compared with the results of quantum chemical calculations and of semiempirical estimates. From lowest energies up to Eʟ = 200 eV g-u-interference oscillations were observed for all systems. In the case of Ne+ -Ne two oscillatory structures with different frequencies were detected and attributed to interference between Π-states and Σ-states, respectively. With increasing atomic number of the rare gas atoms the g-u-structure becomes increasingly irregular. The measured angular distances were used to derive the potential energy difference between the interfering molecular states. The evaluation was carried out by varying parameters of analytical model potentials for the lower lying state and the difference potential until the quantum mechanically calculated differential cross-section agreed with the experimental one within the experimental error. In the case of Ne2+ and Ar2+ the results are compared with ab initio calculations and experimental results of other authors. For Kr+ -Kr and Xe+ -Xe a fit at all energies could not be obtained with a single set of parameters. This effect and the high irregularity of the experimental curves are attributed to fine structure splitting of the molecular states via the strong spin-orbit coupling in Kr and Xe

scholarly journals Anomaly in the differential cross sections at 13 TeV

2021 ◽  
pp. 2150148
Author(s):  
O. V. Selyugin
Keyword(s):  
Elastic Scattering ◽  
Momentum Transfer ◽  
Cross Sections ◽  
Differential Cross ◽  
Scattering Amplitude ◽  
Small Momentum Transfer ◽  
Small Momentum ◽  
Transfer Region ◽  
Elastic Scattering Amplitude ◽  
Unusual Phenomenon

The analysis of the new TOTEM data at 13 TeV in a wide momentum transfer region reveals the unusual phenomenon — the presence in the elastic scattering amplitude of a term with a very large slope that is responsible for the behavior of hadron scattering at a very small momentum transfer. This term can be connected with hadron interactions at large distances.

scholarly journals Simulations of the measurement results of differential cross sections of n-p and n-d elastic scattering at CSNS Back-n WNS

2020 ◽  
Vol 239 ◽  
pp. 01039
Author(s):  
Zengqi Cui ◽  
Huaiyong Bai ◽  
Haoyu Jiang ◽  
Yiwei Hu ◽  
Guohui Zhang ◽  
...  
Keyword(s):  
Elastic Scattering ◽  
Neutron Source ◽  
Cross Sections ◽  
Differential Cross ◽  
Experimental Results ◽  
Differential Cross Sections ◽  
Neutron Energy Range ◽  
Section Data ◽  
Measurement Results ◽  
Deuterated Polyethylene

Differential cross-section data for the n-p and n-d elastic scattering (1H(n, el), 2H(n, el)) are collected and analyzed from EXFOR library. For En > 20 MeV, the experimental results for both reactions are scarce with large uncertainties and discrepancies in general. For En ≤ 20 MeV, the experimental results lack systematicness, most of which were measured around En = 14 MeV even though the differential cross sections of n-p scattering in 1 keV ≤ En ≤ 20 MeV region are recommended as standard. Taking these facts into account, more accurate and systematic measurements are planned. The experiments will be conducted using ΔE-E detectors of the Light-charged Particle Detector Array (LPDA) system at China Spallation Neutron Source (CSNS) Back-n White Neutron Source (WNS), and simulations are carried out. Using polyethylene and deuterated polyethylene as samples, both n-p and n-d scattering reactions are simulated along with the neutron-induced 12C background reactions, and the 2-D spectra and the counting rates of the ΔE-E detectors are obtained. According to the simulations, the applicable neutron energy range and positions of the detectors are recommended, and the beam time for the event and background measurements is suggested.

scholarly journals Experimental study of the $ \gamma p \rightarrow K^{0}\Sigma^{+}$, $ \gamma n \rightarrow K^{0} \Lambda$, and $ \gamma n \rightarrow K^{0} \Sigma^{0}$ reactions at the Mainz Microtron

2019 ◽  
Vol 55 (11) ◽  
Author(s):  
C. S. Akondi ◽  
K. Bantawa ◽  
D. M. Manley ◽  
S. Abt ◽  
P. Achenbach ◽  
...  
Keyword(s):  
Experimental Study ◽  
Cross Sections ◽  
Differential Cross ◽  
Legendre Polynomials ◽  
Neutral Kaon ◽  
Experimental Results ◽  
Differential Cross Sections ◽  
Theoretical Predictions ◽  
Photoproduction Reactions ◽  
Insight Into

Abstract.This work measured $ \mathrm{d}\sigma/\mathrm{d}\Omega$dσ/dΩ for neutral kaon photoproduction reactions from threshold up to a c.m. energy of 1855MeV, focussing specifically on the $ \gamma p\rightarrow K^0\Sigma^+$γp→K0Σ+, $ \gamma n\rightarrow K^0\Lambda$γn→K0Λ, and $ \gamma n\rightarrow K^0 \Sigma^0$γn→K0Σ0 reactions. Our results for $ \gamma n\rightarrow K^0 \Sigma^0$γn→K0Σ0 are the first-ever measurements for that reaction. These data will provide insight into the properties of $ N^{\ast}$N* resonances and, in particular, will lead to an improved knowledge about those states that couple only weakly to the $ \pi N$πN channel. Integrated cross sections were extracted by fitting the differential cross sections for each reaction as a series of Legendre polynomials and our results are compared with prior experimental results and theoretical predictions.

Differential cross sections and analyzing powers for pd elastic scattering below 1.0 MeV

1983 ◽  
Vol 406 (3) ◽  
pp. 435-442 ◽  
Author(s):  
E. Huttel ◽  
W. Arnold ◽  
H. Berg ◽  
H.H. Krause ◽  
J. Ulbricht ◽  
...  
Keyword(s):  
Elastic Scattering ◽  
Cross Sections ◽  
Differential Cross ◽  
Differential Cross Sections ◽  
Analyzing Powers

SCATTERING AND DISSOCIATION OF DEUTERONS AND 3H-NUCLEI BY NUCLEI AT INTERMEDIATE ENERGIES

1995 ◽  
Vol 04 (03) ◽  
pp. 563-586 ◽  
Author(s):  
YU. A. BEREZHNOY ◽  
V. YU. KORDA
Keyword(s):  
Elastic Scattering ◽  
Closed Form ◽  
Cross Sections ◽  
Differential Cross ◽  
Particle System ◽  
Center Of Mass ◽  
Scattering Angle ◽  
Intermediate Energies ◽  
Oscillating Functions ◽  
Analytical Expressions

We present a closed-form description that enables us to obtain the analytical expressions for the elastic scattering and dissociation differential cross-sections of deuterons and 3H-nuclei by heavy target nuclei. The resulting expressions are used to analyze the data for the 110 MeV deuterons elastically scattered on 208Pb-nuclei. The dissociation cross-sections of deuterons and 3H-nuclei are the oscillating functions of the scattering angle of the released two- and three-nucleon-particle system center-of-mass.

Differential cross-section measurements in positron–argon collisions

1996 ◽  
Vol 74 (7-8) ◽  
pp. 505-508 ◽  
Author(s):  
R. M. Finch ◽  
Á. Kövér ◽  
M. Charlton ◽  
G. Laricchia
Keyword(s):  
Elastic Scattering ◽  
Differential Cross Section ◽  
Inelastic Scattering ◽  
Energy Range ◽  
Cross Section ◽  
Cross Sections ◽  
Differential Cross ◽  
Coupling Effect ◽  
Channel Coupling ◽  
Scattering Cross

Differential cross sections for elastic scattering and ionization in positron–argon collisions as a function of energy (40–150 eV) are reported at 60°. Of particular interest is the energy range 55–60 eV, where earlier measurements by the Detroit group found a drop in the elastic-scattering cross section of a factor of 2. This structure has been tentatively attributed to a cross channel-coupling effect with an open inelastic-scattering channel, most likely ionization. Our results indicate that ionization remains an important channel over the same energy range and only begins to decrease at an energy above 60 eV.

The elastic scattering of fast electrons and positrons by hydrogen and helium atoms

1959 ◽  
Vol 250 (1262) ◽  
pp. 337-345 ◽  
Keyword(s):  
Elastic Scattering ◽  
Cross Sections ◽  
Differential Cross ◽  
Born Approximation ◽  
Logarithmic Singularity ◽  
Hydrogen Atoms ◽  
Fast Electrons ◽  
Helium Atoms ◽  
Electrons And Positrons ◽  
Angle Scattering

A simplification of the second Born approximation due to Massey & Mohr is used to calculate the differential cross-sections for the elastic scattering of fast electrons and fast positrons by hydrogen atoms and helium atoms, the method of Dalitz being applied to evaluate all the relevant integrals. Although the logarithmic singularity which is found in the differential cross-section for zero-angle scattering is shown to be absent in the true second Born approximation the use of the simplification of this approximation is justified at sufficiently high impact energies provided the angle of scattering is not too small. The results of the calculations for incident electrons in helium are compared with the available experimental data.

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