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.

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 Benchmarking the natSi(p,p0) and natO(d,d0) elastic scattering and the 16O(d,p0,1,α0) reactions for IBA purposes

2019 ◽  
Vol 24 ◽  
pp. 244
Author(s):  
S. Dede ◽  
M. Kokkoris ◽  
A. Lagoyannis ◽  
V. Paneta ◽  
K. Preketes-Sigalas ◽  
...  
Keyword(s):  
Elastic Scattering ◽  
Differential Cross Section ◽  
Energy Range ◽  
Cross Section ◽  
Differential Cross ◽  
Particle Physics ◽  
Ion Beam ◽  
Experimental Procedure ◽  
Beam Analysis ◽  
Experimental Parameters

The benchmarking experimental procedure in IBA (Ion Beam Analysis) is carefully designed in order to validate evaluated and experimental differential cross–section datasets of charged particles via the acquisition of EBS and NRA spectra from thick targets of known composition, followed by their simulations. In the present work, such benchmarking measurements have been performed at the laboratory of the Institute for Nuclear and Particle Physics “Demokritos”, for the elastic scattering of protons on natSi in the energy range of 1.1 – 3.5 MeV at four backward angles, at 140o, 150o, 160o and 170o. In addition, measurements were performed for the elastic scattering of deuterons on 16O in the energy range of 1.1 – 1.7 MeV at four backward angles, at 140o, 150o, 165o and 170o. More specifically, a thick non–polished Si target with Au evaporated on top and a Nb2O5 tablet were used. The spectra acquired were compared with simulated ones using the SIMNRA program along with the evaluated differential cross-section datasets from IBANDL. All the experimental parameters were thoroughly investigated. The obtained results, the observed discrepancies and the encountered problems during the benchmarking process are discussed and analyzed.

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.

scholarly journals Differential Cross Sections of 9Be(d,p0)10Be, 9Be(d,p1)10Be, 9Be(d,α0)7Li and 9Be(d,α1)7Li reactions

2019 ◽  
Vol 26 ◽  
pp. 151
Author(s):  
P. Tsavalas ◽  
A. Lagoyannis ◽  
K. Mergia ◽  
E. Ntemou ◽  
C. P. Lungu
Keyword(s):  
Elastic Scattering ◽  
Energy Range ◽  
Nuclear Reaction ◽  
Cross Section ◽  
Cross Sections ◽  
Differential Cross ◽  
Areal Density ◽  
Deuteron Energy ◽  
Nuclear Reaction Analysis ◽  
The Cross

In the present work, the cross sections of the 9Be(d,p0)10Be, 9Be(d,p1)10Be,9Be(d,α0)7Li and 9Be(d,α1)7Li in the deuteron energy range Elab= 1 – 2.2 MeV with an energy step of 20 keV and at detection angles between 120o and 170o were measured, suitable for nuclear reaction analysis. A Si3N4film coated with a thin Be layer was used and the cross sections are determined relatively to the cross section of the natSi(d,d)natSi elastic scattering. Additionally, proton and oxygen beam measurements were carried out in order to determine the atomic areal density which is required to determine the cross sections.

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 Measurement of the differential cross sections of natLi(d,d0) for EBS purposes

2019 ◽  
Vol 24 ◽  
pp. 272
Author(s):  
E. Ntemou ◽  
K. Preketes-Sigalas ◽  
X. Aslanoglou ◽  
V. Foteinou ◽  
M. Kokkoris ◽  
...  
Keyword(s):  
Fine Structure ◽  
Elastic Scattering ◽  
Energy Range ◽  
Cross Section ◽  
Cross Sections ◽  
Differential Cross ◽  
Beam Energy ◽  
Deuteron Beam ◽  
Differential Cross Sections

In the present work, the 6,7Li(d,d0)6,7Li elastic scattering differential cross sections were measured in the energy range Elab = 900 – 2000 keV for EBS purposes, using thin lithium targets, made by evaporating natLiF and isotopically enriched 6LiF powder on self-supporting carbon stripping foils, with an ultra-thin Au layer on top for charge normalization purposes. The experiment was carried out in deuteron beam energy steps of 5 to 30 keV, depending on the fine structure of each studied cross section, and for the laboratory scattering angles of 125˚, 140˚, 150˚, 160˚, and 170˚.

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.

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