scholarly journals Single and double diffractive dissociation and the problem of extraction of the proton–Pomeron cross-section

2016 ◽  
Vol 31 (10) ◽  
pp. 1650049 ◽  
Author(s):  
V. A. Petrov ◽  
R. A. Ryutin
Keyword(s):  
Asymptotic Behavior ◽  
Cross Section ◽  
Cross Sections ◽  
Differential Cross ◽  
Differential Cross Sections ◽  
Hadronic Tensor ◽  
Diffractive Dissociation ◽  
Double Dissociation

Diffractive dissociation processes are analyzed in the framework of covariant reggeization. We have considered the general form of hadronic tensor and its asymptotic behavior for [Formula: see text] in the case of conserved tensor currents before reggeization. Resulting expressions for differential cross-sections of single dissociation (SD) process [Formula: see text], double dissociation (DD) [Formula: see text] and for the proton–Pomeron cross-section are given in detail, and corresponding problems of the approach 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.

scholarly journals A benchmarking procedure for PIGE related differential cross-sections

2019 ◽  
Vol 24 ◽  
pp. 36
Author(s):  
M. Axiotis ◽  
A. Lagoyannis ◽  
S. Fazinić ◽  
S. Harrisopulos ◽  
M. Kokkoris ◽  
...  
Keyword(s):  
Differential Cross Section ◽  
Cross Section ◽  
Cross Sections ◽  
Differential Cross ◽  
A Priori ◽  
Light Element ◽  
Thick Target ◽  
A Priori Knowledge ◽  
Differential Cross Sections ◽  
The World

The application of standard-less PIGE requires the a priori knowledge of the differential cross section of the reaction used for the quantification of each detected light element. Towards this end, a lot of datasets have been published the last few years from several laboratories around the world. The discrepancies found can be resolved by applying a rigorous benchmarking procedure through the measurement of thick target yields. Such a procedure is proposed in the present paper and is applied in the case of the 19F(p,p’γ)19F reaction.

scholarly journals Evaluation of the Compton (Incoherent) and Rayleigh (Coherent) Differential Cross Sections of Scattering for Rhodium 103Rh45 and Tantalum181Ta73 by Employing CSC model

2012 ◽  
Vol 9 (3) ◽  
pp. 554-558 ◽  
Author(s):  
Baghdad Science Journal
Keyword(s):  
Differential Cross Section ◽  
Cross Section ◽  
Cross Sections ◽  
Differential Cross ◽  
Form Factors ◽  
Differential Cross Sections ◽  
The Cross

The differential cross section for the Rhodium and Tantalum has been calculated by using the Cross Section Calculations (CSC) in range of energy(1keV-1MeV) . This calculations based on the programming of the Klein-Nashina and Rayleigh Equations. Atomic form factors as well as the coherent functions in Fortran90 language Machine proved very fast an accurate results and the possibility of application of such model to obtain the total coefficient for any elements or compounds.

scholarly journals Erratum to: Measurement of differential cross sections and W+/W− cross-section ratios for W boson production in association with jets at $$ \sqrt{s} $$ = 8 TeV with the ATLAS detector

2020 ◽  
Vol 2020 (10) ◽  
Author(s):  
M. Aaboud ◽  
◽  
G. Aad ◽  
B. Abbott ◽  
O. Abdinov ◽  
...  
Keyword(s):  
Cross Section ◽  
Cross Sections ◽  
Differential Cross ◽  
W Boson ◽  
Atlas Detector ◽  
Boson Production ◽  
Differential Cross Sections ◽  
8 Tev ◽  
W Boson Production

Two additions impacting tables 3 and 4 in ref. [1] are presented in the following. No significant impact is found for other results or figures in ref. [1].

The small-angle scattering of photons of about 100 MeV energy

1960 ◽  
Vol 254 (1277) ◽  
pp. 242-258 ◽  
Keyword(s):  
Cross Section ◽  
Cross Sections ◽  
Differential Cross ◽  
Primary Source ◽  
Bremsstrahlung Spectrum ◽  
Differential Cross Sections ◽  
Approximate Theory ◽  
Cerenkov Counter ◽  
Scattering Cross ◽  
Angle Scattering

Differential cross-sections have been measured for the scattering of photons of mean energy 87 MeV by uranium at eight angles in the range from 1.18 to 4.48 mrad and by aluminium, silver, tungsten, lead and uranium at angles of 1.89 and 4.24 mrad, using a narrowly collimated bremsstrahlung beam from the Oxford 110 MeV synchrotron as the primary source of photons. A biased total-absorption Čerenkov counter was used to detect photons with energies near the peak energy of the bremsstrahlung spectrum, and absolute differential cross-sections were measured by comparing counting rates for photons in the primary and scattered beams. The experimental results, with the differential Compton scattering cross-sections of Klein and Nishina subtracted, were analyzed in terms of their variation with angle and atomic number, and can be described as consisting of a sharply peaked angular distribution with absolute cross-sections varying from element to element as Z 4 , together with a uniform distribution varying nearly as Z 2 ; these distributions were identified with Delbruck scattering and with bremsstrahlung from secondary electrons in the scattering target, respectively. The Delbruck scattering cross-section thus determined is slightly more sharply peaked than the cross-section predicted by an approximate theory of Bethe & Rohrlich.

scholarly journals Doppler Measurement of Differential Cross Sections in Crossed Beam Experiments: Dependence of the Detection Sensitivity With the Product Velocity

1990 ◽  
Vol 10 (5-6) ◽  
pp. 319-332 ◽  
Author(s):  
N. Billy ◽  
B. Girard ◽  
G. Gouédard ◽  
J. Vigué
Keyword(s):  
Cross Section ◽  
Cross Sections ◽  
Differential Cross ◽  
Internal State ◽  
Laser Induced Fluorescence ◽  
Detection Sensitivity ◽  
Differential Cross Sections ◽  
Doppler Measurement ◽  
Laser Induced Fluorescence Detection ◽  
Doppler Profile

Differential cross sections can be measured as a function of the internal state of a reaction product thanks to the analysis of the Doppler profile of the laser induced fluorescence detection line. This analysis is complicated by two effects: first, the LIF signal intensity depends on the interaction time of the molecule with the laser, and this time depends on the scattering angle, second, the angular and velocity distributions of the beams have non negligible widths. We present here a treatment of these effects in the case of the F+I2 reaction for which we have measured the differential cross section by this technique. The same formalism is also applied to the deduction of the rovibrational distribution of the products from the relative intensities of the LIF lines.

Small Angle Elastic Scattering of 4.3 MeV Neutrons From U, Bi, and Pb

1973 ◽  
Vol 51 (20) ◽  
pp. 2197-2201 ◽  
Author(s):  
P. W. Martin ◽  
R. McFadden ◽  
B. L. White
Keyword(s):  
Elastic Scattering ◽  
Satisfactory Agreement ◽  
Cross Section ◽  
Cross Sections ◽  
Small Angle ◽  
Differential Cross ◽  
Optical Model ◽  
Differential Cross Sections ◽  
Electromagnetic Interactions ◽  
The Cross

The differential cross sections for 4.3 MeV neutrons elastically scattered from natural samples of U, Bi, and Pb have been measured at laboratory angles of 5, 10, and 15°. In the case of uranium, the data are consistent with calculations based on the nuclear optical model and known electromagnetic interactions. Less satisfactory agreement to the data is obtained in the cross section measurements for lead and bismuth.

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