The interaction of 970 MeV protons with helium

1960 ◽  
Vol 257 (1290) ◽  
pp. 316-325 ◽  
Keyword(s):  
Cross Sections ◽  
Optical Model ◽  
Meson Production ◽  
Absorption Cross ◽  
Proton Proton ◽  
Particle Characteristics ◽  
Pressure Diffusion ◽  
Elastic Proton ◽  
Charged Meson ◽  
Mev Protons

The interaction of 970 MeV protons with helium has been studied with a high-pressure diffusion cloud chamber. From 642 events the total and absorption cross-sections were found to be 116 ± 17 mb and 93 ± 13 mb, respectively. These agree with values obtained by extrapolation of known cross-sections for more complex nuclei, and the results are interpreted in terms of the optical model of the nucleus. The angular distribution for elastic-scattering yields an α -particle radius of 1⋅8 x 10 -13 cm. Quasi-elastic proton-proton and proton-neutron scattering, and more particularly charged meson production, show that the α -particle has some individual particle characteristics. Meson reabsorption appears unimportant.

Proton-deuteron interactions at 970 MeV

1959 ◽  
Vol 251 (1265) ◽  
pp. 233-246 ◽  
Keyword(s):  
Elastic Scattering ◽  
Cross Sections ◽  
Meson Production ◽  
The Other ◽  
Isotopic Spin ◽  
Nuclear Forces ◽  
Proton Proton ◽  
Pressure Diffusion ◽  
Charge Independence ◽  
Good Agreement

A high-pressure diffusion cloud chamber has been used to study the interactions of 970 MeV protons from the Birmingham synchrotron with deuterium. Analysis of the 569 collisions observed indicates that at this energy the deuteron behaves as if it were composed of two free nucleons. The properties of proton-proton and proton-neutron scattering have been determined on this assumption. An estimate is made of the extent of the ‘shadowing’ of each nucleon in the deuteron by the other. The partial cross-sections for p-p and p-n elastic scattering have been determined, as have also the values for the five possible single meson production processes. They have the following ‘best’ values: (1) ( p + p-> p + p ) = 25.9 + 1.7 mb, (2) ( p + n-> p + n ) = 16.2 + 3.5 mb, (3) ( p + p-> p + p + 7T 0 ) = 5.4 + 1.0 mb, (4) ( p + p -> n + p + 7T + ) = 15.6 + 1.7 mb, (5) ( p + n-> p + n + n 0 ) = 14.3 + 3.5 mb, (6) ( p + n-+ p + p + 7T - ) = 2.7 + 0.6mb, (7) ( p + n-> n + n + 7T + ) = 4.3 + 1.1 mb. Double meson production and reactions involving secondary deuterons are not important. The cross-sections (1), (2), (3), (4) and (5) are consistent with values extrapolated from data at energies below 660 MeV by Russian workers. Knowledge of the other cross-sections (6) and (7) makes possible a test of the validity of the charge independence of nuclear forces. The present results are not in good agreement with this. The results for inelastic scattering indicate that, assuming charge independence, the formation of excited nucleons of isotopic spin 3/2 does not dominate the process of pion production. This is also true for the Russian data. Twelve cases of double meson production were observed. The angular distribution of proton-neutron elastic scattering has the form expected from lower energy data.

Optical model analysis of elastic scattering of 100-MeV protons from light nucle

1968 ◽  
Vol 46 (23) ◽  
pp. 2645-2657 ◽  
Author(s):  
T. Y. Li ◽  
S. K. Mark
Keyword(s):  
Elastic Scattering ◽  
Cross Sections ◽  
Optical Model ◽  
Light Nuclei ◽  
Geometrical Parameters ◽  
Heavy Nuclei ◽  
The Real ◽  
Radius Parameter ◽  
Optical Model Analysis ◽  
Mev Protons

Elastic scattering cross sections for the interaction of 100-MeV protons with 6Li, 7Li, 9Be, and 12C have been analyzed using the optical model. The experimental differential cross sections are reasonably reproduced. It has been found that no average set of geometrical parameters can provide a quantitative fit to the experimental data for all of these light nuclei; they must be treated individually, with optimum optical potential parameters fluctuating from one nucleus to another. Other features revealed in this analysis include: (1) the spin–orbit radius parameter is smaller than those of the real and imaginary parts of the potential, (2) surface and volume absorption potentials give equally good fit to the experimental results, (3) the radius parameters of the real and imaginary potentials differed from each other, and (4) the radius parameter of the real part of the potential is larger than those used for heavy nuclei.

Microscopic optical model calculations of - nucleus absorption cross sections

1996 ◽  
Vol 22 (3) ◽  
pp. 387-396 ◽  
Author(s):  
R R Dubey ◽  
G S Khandelwal ◽  
F A Cucinotta ◽  
J W Wilson
Keyword(s):  
Cross Sections ◽  
Optical Model ◽  
Absorption Cross ◽  
Model Calculations

scholarly journals CALCULATION OF THE ELASTIC p6He AND p8He SCATTERING IN GLAUBER APPROXIMATION

2013 ◽  
Vol 22 (04) ◽  
pp. 1350017 ◽  
Author(s):  
ELENA IBRAEVA ◽  
ONLASYN IMAMBEKOV ◽  
ALBERT DZHAZAIROV-KAHRAMANOV
Keyword(s):  
Cross Sections ◽  
Optical Model ◽  
High Energy ◽  
Proton Scattering ◽  
Diffraction Scattering ◽  
Multiple Diffraction ◽  
Weakly Bound ◽  
Analyzing Powers ◽  
Elastic Proton ◽  
Three Body

A series of calculations of differential cross-sections (DCSs) and analyzing powers (Ay) of the elastic proton scattering on isotopes 6 He and 8 He were presented in the framework of the theory of Glauber multiple diffraction scattering. The three-body α–n–n and harmonic oscillator wave functions (WFs) were used for 6 He , for 8 He — the function of density distribution in LSSM. For p6 He scattering, the expansion of the Glauber operator into a series of multiple-scattering is written in the form consistent with the picture of weakly bound clusters in halo-nuclei, while for p8 He scattering the members of single and double collisions are included in the operator. We have done the comparison of our results with available experimental data (including new data of Ay for p6 He scattering at the E = 71 MeV/nucleon) and with the calculations' results in the other approaches (high-energy, optical model, RMF). Also, a comparison of the characteristics of two isotopes 6 He and 8 He was made, which showed that they correlate quite well with each other.

scholarly journals THE MESON PRODUCTION IN PROTON–PROTON COLLISIONS IN NEXT-TO-LEADING ORDER AND INFRARED RENORMALONS

2011 ◽  
Vol 20 (05) ◽  
pp. 1243-1270 ◽  
Author(s):  
A. I. AHMADOV ◽  
R. M. BURJALIYEV
Keyword(s):  
Cross Section ◽  
Cross Sections ◽  
Production Cross ◽  
Meson Production ◽  
Leading Order ◽  
Proton Proton ◽  
Proton Collisions ◽  
Running Coupling ◽  
Coupling Approach ◽  
Proton Proton Collisions

In this paper, we investigate the next-to-leading order contribution of the higher-twist Feynman diagrams to the large-pT inclusive pion production cross-section in proton–proton collisions and present the general formulae for the higher-twist differential cross-sections in the case of the running coupling and frozen coupling approaches. We compared the resummed next-to-leading order higher-twist cross-sections with the ones obtained in the framework of the frozen coupling approach and leading-twist cross-section. The structure of infrared renormalon singularities of the higher-twist subprocess cross-section and its resummed expression (the Borel sum) are found. It is shown that the resummed result depends on the choice of the meson wave functions used in the calculations. We discuss the phenomenological consequences of possible higher-twist contributions to the meson production in proton–proton collisions in next-to-leading order at RHIC.

Wide-angle differential cross sections for elastic proton-proton scattering in the region ofΔ(1236)production

1975 ◽  
Vol 12 (1) ◽  
pp. 1-5 ◽  
Author(s):  
K. Abe ◽  
B. A. Barnett ◽  
J. H. Goldman ◽  
A. T. Laasanen ◽  
P. H. Steinberg ◽  
...  
Keyword(s):  
Cross Sections ◽  
Differential Cross ◽  
Differential Cross Sections ◽  
Wide Angle ◽  
Proton Scattering ◽  
Proton Proton ◽  
Elastic Proton

Meson production in two-photon interaction in pp and pA ultraperipheral collisions at the LHC and FCC

2018 ◽  
Vol 27 (09) ◽  
pp. 1850075
Author(s):  
Ya-Ping Xie ◽  
Xurong Chen
Keyword(s):  
Large Hadron Collider ◽  
Cross Sections ◽  
Hadron Collider ◽  
Meson Production ◽  
Photon Flux ◽  
Proton Proton ◽  
Photon Interaction ◽  
Cern Large Hadron Collider ◽  
Two Photon ◽  
Equivalent Photon

Meson cross-sections are evaluated in two-photon interaction in hadron–hadron ultraperipheral collisions at the CERN Large Hadron Collider (LHC) and Future Circular Collider (FCC). Two models of the equivalent photon flux are employed in the calculations. Cross-sections of meson production in proton–proton and proton-lead ultraperipheral collisions are presented in this paper. These meson cross-sections in two-photon interaction can be applied to predict cross-sections in the experiments at the LHC and FCC.

scholarly journals Observation of Odderon effects at LHC energies: a real extended Bialas–Bzdak model study

2021 ◽  
Vol 81 (7) ◽  
Author(s):  
T. Csörgő ◽  
I. Szanyi
Keyword(s):  
Differential Cross Section ◽  
Cross Section ◽  
Cross Sections ◽  
Differential Cross ◽  
Scattering Amplitude ◽  
Proton Collision ◽  
Differential Cross Sections ◽  
Proton Antiproton ◽  
Proton Proton ◽  
Elastic Proton

AbstractThe unitarily extended Bialas–Bzdak model of elastic proton–proton scattering is applied, without modifications, to describe the differential cross-section of elastic proton–antiproton collisions in the TeV energy range, and to extrapolate these differential cross-sections to LHC energies. In this model-dependent study we find that the differential cross-sections of elastic proton–proton collision data at 2.76 and 7 TeV energies differ significantly from the differential cross-section of elastic proton–antiproton collisions extrapolated to these energies. The elastic proton–proton differential cross-sections, extrapolated to 1.96 TeV energy with the help of this extended Bialas–Bzdak model do not differ significantly from that of elastic proton–antiproton collisions, within the theoretical errors of the extrapolation. Taken together these results provide a model-dependent, but statistically significant evidence for a crossing-odd component of the elastic scattering amplitude at the at least 7.08 sigma level. From the reconstructed Odderon and Pomeron amplitudes, we determine the $$\sqrt{s}$$ s dependence of the corresponding total and differential cross-sections.

scholarly journals Born Approximation for Polarization Observables at the Scattering of Protons by 40Ca Nuclei

2020 ◽  
Vol 65 (5) ◽  
pp. 369
Author(s):  
O. V. Babak ◽  
Yu. A. Berezhnoy ◽  
V. P. Mikhailyuk
Keyword(s):  
Experimental Data ◽  
Cross Sections ◽  
Born Approximation ◽  
Reasonable Agreement ◽  
Optical Model ◽  
Proton Scattering ◽  
Elastic Proton ◽  
Nucleus Scattering ◽  
Polarization Observables ◽  
Analytical Expressions

A development of the optical model for the description of the hadron-nucleus scattering is proposed. When describing the behavior of polarization observables for the elastic proton scattering on 40Ca nuclei in the energy interval from 200 to 800 MeV, the Born approximation is used. Analytical expressions for the scattering amplitudes, as well as for the differential cross-sections and polarization observables, are obtained. The comparison of the scattering observables calculated in the 1st and 2nd Born approximations is made. It is shown that the observables calculated in this approach are in a reasonable agreement with the available experimental data.

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