scholarly journals The Elastic Scattering of 20 eV Electrons from Magnesium

1995 ◽  
Vol 48 (1) ◽  
pp. 71 ◽  
Author(s):  
MJ Brunger ◽  
RK Houghton ◽  
PJO Teubner
Keyword(s):  
Elastic Scattering ◽  
Differential Cross Section ◽  
Cross Section ◽  
Cross Sections ◽  
Differential Cross ◽  
Elastic Cross Section ◽  
Complex Phase ◽  
Shift Analysis ◽  
Order Of Magnitude ◽  
Elastic Differential Cross Section

A modulated crossed-beam technique has been used to measure the differential cross section for elastic scattering of electrons from the 31S state in magnesium at an impact electron energy of 20 eV. The cross section was measured over a range of scattering angles from 15� to 1300? Our results agree with the previous experimental cross sections of Williams and Trajmar within the combined uncertainties, however, the present data reduce the uncertainty by about an order of magnitude, thereby allowing a meaningful comparison to be made with the predictions of the various theories. At this time no theory accurately predicts the behaviour of the elastic differential cross section over the whole angular range. A complex phase-shift analysis is applied to the present data to derive the 20 e V integral elastic cross section. This integral cross section is also compared with the results of previous experiment and theory.

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.

Scattering of Ions VI. Elastic Scattering of N+ on Ne, Ar, Kr, and Xe

1974 ◽  
Vol 29 (8) ◽  
pp. 1143-1151 ◽  
Author(s):  
H.-P. Weise ◽  
H.-U. Mittmann
Keyword(s):  
Experimental Data ◽  
Elastic Scattering ◽  
Differential Cross Section ◽  
Cross Section ◽  
Differential Cross ◽  
Rare Gas ◽  
Single Group ◽  
Potential Depth ◽  
Different Types ◽  
Elastic Differential Cross Section

In the elastic differential cross-section of the N+-rare gas systems two different types of oscillations have been observed. At an energy of a few eV a primary rainbow was detected for all systems. In the case of N+ - Ar, secondary rainbows were resolved too. From these experimental data the potential depths were determined to be: ε (N+ - Ne) = 0.4 eV, ε (N+ - Kr) = 0.29 eV, ε(N+ - Xe) = 0.92 eV. For the system N+ - Ar the shape of the reduced potential was obtained by evaluating the positions of the secondary rainbow extrema. The potential depth was found to be 2.16 eV. At higher energies and large scattering angles additional oscillations appeared which are presumed to be Stueckelberg oscillations. For N+ - Ne a single group of strongly marked oscillations appeared up to the highest energies used (EL = 220 eV). In the case of N+ - Ar the amplitudes of these undulations are strongly quenched. For N+ - Kr and N+ - Xe several groups of oscillations with different amplitudes and frequencies seem to be superimposed in the differential cross-section. They are attributed for all systems to crossings of the incoming state with the charge exchanged state.

The p +9Be elastic scattering below 30MeV: Optical model analysis and data normalization

2021 ◽  
pp. 2150024
Author(s):  
H. M. Maridi ◽  
A. Pakou ◽  
K. Rusek
Keyword(s):  
Elastic Scattering ◽  
Differential Cross Section ◽  
Cross Section ◽  
Cross Sections ◽  
Differential Cross ◽  
Optical Model ◽  
Reaction Cross ◽  
Data Normalization ◽  
Optical Model Analysis ◽  
Reaction Cross Sections

Differential cross-section data of elastic scattering for [Formula: see text]Be below a proton incident energy of 30[Formula: see text]MeV are evaluated by using two techniques. First, optical model analysis is performed and applied to the analyzing powers and reaction cross-sections to extract the optical potential parameters. Then, angular distributions of the differential cross-section are calculated with this potential and compared with the experimental data and normalization coefficients are extracted. Second, a consistent comparison between data sets with similar energies is considered in a minimization process to obtain another set of data normalization coefficients. The two techniques lead to similar normalized values for the existing data and consistently validate a body of low-energy data that can be safely used for further theoretical studies. Furthermore, the systematic behavior and energy dependence of the volume integral are determined as well as the energy dependence of the reaction cross-sections is predicted.

scholarly journals First results of the differential cross sections of 9Be(d,d0) at energies and angles suitable for Elastic Backscattering Spectroscopy

2019 ◽  
Vol 26 ◽  
pp. 158
Author(s):  
E. Ntemou ◽  
M. Kokkoris ◽  
A. Lagoyannis ◽  
C. Lungu ◽  
K. Mergia ◽  
...  
Keyword(s):  
Elastic Scattering ◽  
Differential Cross Section ◽  
Energy Range ◽  
Cross Section ◽  
Cross Sections ◽  
Differential Cross ◽  
Differential Cross Sections ◽  
Tandem Accelerator ◽  
First Results ◽  
Elastic Backscattering

The differential cross sections of the 9Be(d,d0) elastic scattering were determined in the present work in the energy range of Ed,lab = 740 - 2200 keV in variable steps, mainly 20 keV at five backscattering angles (120o, 140o, 150o, 160o and 170o). The measurements were performed at the 5.5 MV TN11 HV Tandem Accelerator of the N.C.S.R. “Demokritos” implementing a high precision goniometer. The target used was a thin Si3N4 target with a Beryllium layer on top. The obtained differential cross section values are compared to the ones existing in literature and the observed similarities and discrepancies are discussed.

scholarly journals Recent Results from the CERN LHC Experiment TOTEM: Implications for Odderon Exchange

2019 ◽  
Vol 206 ◽  
pp. 06004 ◽  
Author(s):  
T. Csörgő
Keyword(s):  
Elastic Scattering ◽  
Differential Cross Section ◽  
Cross Section ◽  
Imaginary Part ◽  
Cross Sections ◽  
Differential Cross ◽  
Slope Parameter ◽  
The Real

Recent results are summarized from the TOTEM experiment at CERN LHC, including measurements of the total, elastic and inelastic cross-sections, the nuclear slope parameter B, the differential cross-section of elastic scattering and the real to imaginary part ration ρ at $ \sqrt s $ = 2.76 and 13 TeV. The implications of these data for Odderon (odd-gluon colorless) exchange are discussed.

ISOSPIN DECOMPOSITION OF pp → NNππ CROSS SECTIONS — DO WE SEE A SIGN OF Δ(1600) EXCITATION IN THE nnπ+π+ CHANNEL?

2009 ◽  
Vol 24 (02n03) ◽  
pp. 450-453
Author(s):  
◽  
T. SKORODKO ◽  
M. BASHKANOV ◽  
D. BOGOSLOWSKY ◽  
H. CALÉN ◽  
...  
Keyword(s):  
Cross Section ◽  
Cross Sections ◽  
Differential Cross ◽  
Pion Production ◽  
Significant Contribution ◽  
Differential Cross Sections ◽  
Pp Collisions ◽  
Theoretical Predictions ◽  
Order Of Magnitude ◽  
The Cross

The two-pion production in pp-collisions has been investigated in exclusive measurements from threshold up to Tp = 1.36 GeV . Total and differential cross sections have been obtained for the channels pnπ+π0, ppπ+π-, ppπ0π0 and also nnπ+π+. For intermediate incident energies Tp > 1 GeV , i.e. in the region, which is beyond the Roper excitation but at the onset of ΔΔ excitation the total ppπ0π0 cross section falls behind theoretical predictions by as much as an order of magnitude near 1.2 GeV, whereas the nnπ+π+ cross section is a factor of five larger than predicted. A model-unconstrained isospin decompostion of the cross section points to a significant contribution of an isospin 3/2 resonance other than the Δ(1232). As a possible candidate the Δ(1600) is discussed.

Theoretical implications of Fermilab Tevatron total and elastic differential-cross-section measurements

1990 ◽  
Vol 41 (3) ◽  
pp. 978-981 ◽  
Author(s):  
M. Block ◽  
R. Fletcher ◽  
F. Halzen ◽  
B. Margolis ◽  
P. Valin
Keyword(s):  
Differential Cross Section ◽  
Cross Section ◽  
Differential Cross ◽  
Elastic Differential Cross Section
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