Pion electroproduction from and near threshold

1983 ◽  
Vol 61 (8) ◽  
pp. 1227-1230
Author(s):  
Edward T. Dressler
Keyword(s):  
Theoretical Model ◽  
Electron Energy ◽  
Cross Section ◽  
Cross Sections ◽  
Differential Cross ◽  
Incident Electron Energy ◽  
Differential Cross Sections ◽  
Text Data ◽  
Pion Energy ◽  
Good Agreement

The differential cross sections for [Formula: see text], n and [Formula: see text], 2n are calculated and compared with some recent data (Caplan and Sealock, manuscript in preparation). The theoretical model in this calculation uses essentially the same approximations as were used by Dressier et al. (1979) for the [Formula: see text] total threshold cross section. The results of this new calculation are in good agreement with the [Formula: see text], n data. However, comparing our results to the [Formula: see text] data at an incident electron energy of 200 MeV and a pion energy of 15 MeV seems to indicate that the [Formula: see text], 2n calculation somewhat overestimates this cross section.

Angular distributions of the 12C(e,p)e′ reaction at Ee = 200 MeV

1981 ◽  
Vol 59 (2) ◽  
pp. 271-274 ◽  
Author(s):  
G. J. Lolos ◽  
S. Hontzeas ◽  
R. M. Sealock
Keyword(s):  
Electron Energy ◽  
Cross Sections ◽  
Differential Cross ◽  
Proton Energy ◽  
Incident Electron ◽  
Incident Electron Energy ◽  
Angular Distributions ◽  
Differential Cross Sections ◽  
Good Agreement

Double differential cross sections at six angles ranging from 45° to 143° have been measured for the 12C(e,p)e′ reaction. The proton energy ranged from 15.6 to 17.2 MeV at an incident electron energy of 200 MeV. At the backward angles our results are in good agreement with data reported by Vysotskaya and Afanas'ev but for forward angles the results are lower.

Electroproduction of low energy π+ from 3He

1982 ◽  
Vol 60 (9) ◽  
pp. 1257-1260
Author(s):  
R. M. Sealock ◽  
H. S. Caplan ◽  
B. W. Zulkoskey ◽  
A. Szyjewicz ◽  
E. L. Tomusiak
Keyword(s):  
Cross Section ◽  
Cross Sections ◽  
Differential Cross ◽  
Incident Energy ◽  
Pion Production ◽  
Low Energy ◽  
Angular Distributions ◽  
Differential Cross Sections ◽  
Channel Calculation ◽  
Good Agreement

Differential cross sections were measured for the electro-pion production from H and 3He at an incident energy of 200 MeV and pion energies from 7.3 to 12.1 MeV. Pion-angular distributions are presented and compared with theory. For hydrogen there is good agreement. A simple three-channel calculation performed for the pion production from 3He was found to overestimate the cross section at forward pion angles.

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.

Sign in / Sign up

Export Citation Format

Share Document