Postmaximum energy dependence of the cross sections of the K + CH3I → KI + CH3 reaction

1974 ◽  
Vol 60 (3) ◽  
pp. 1178-1179 ◽  
Author(s):  
Byung Chan Eu
Keyword(s):  
Energy Dependence ◽  
Cross Sections ◽  
The Cross

DIFFRACTION AND VECTOR MESON PRODUCTION

2004 ◽  
Vol 19 (07) ◽  
pp. 1099-1110 ◽  
Author(s):  
Y. YAMAZAKI
Keyword(s):  
Vector Meson ◽  
Energy Dependence ◽  
Cross Sections ◽  
Meson Production ◽  
High Energy ◽  
Vector Meson Production ◽  
Diffractive Process ◽  
The Cross

A review is given of the measurements of the diffractive process in recent years from two high-energy colliders, the HERA ep collider and the Tevatron [Formula: see text] collider. The energy dependence of the cross sections and the factorisation properties of diffractive processes are discussed.

Energy dependence of the cross sections for the and the reactions

1975 ◽  
Vol 239 (2) ◽  
pp. 260-270 ◽  
Author(s):  
V. Valković ◽  
Ď. Miljanlć ◽  
R.B. Liebert ◽  
G.C. Phillips
Keyword(s):  
Energy Dependence ◽  
Cross Sections ◽  
The Cross

The dissociation of fast H 2 + ions by hydrogen

1960 ◽  
Vol 256 (1286) ◽  
pp. 416-426 ◽  
Keyword(s):  
Triplet State ◽  
Energy Dependence ◽  
Cross Sections ◽  
Large Fraction ◽  
Exchange Process ◽  
Hydrogen Gas ◽  
High Energies ◽  
Scintillation Crystals ◽  
The Cross ◽  
Simple Dissociation

H 2 + ions of energy 100 to 800 keV have been passed through hydrogen gas and the cross-sections for the following four processes determined : (1) H 2 + → H + + H O , (2) H 2 + → H + + H + , (3) H 2 + → H O + H O , (4) H 2 + → H 2 O . A magnetic field was used to separate the fast dissociation products of different e / m , and CsI(Tl) scintillation crystals were used as detectors. Double-height pulses resulted when two particles of the same e / m , simultaneously entered one of the crystals and were clearly resolved from single pulses. Processes (3) and (4) were separated by moving a fine slit across the neutral-particle counter which thus counted only H 2 O particles as double pulses. The partial cross-sections for processes (1) and (2) show an E -1 dependence at high energies. The energy dependence is less marked below 300 keV, where the Born approximation might be expected to be invalid. The partial cross-sections for processes (3) and (4) show the strong energy dependence characteristic of an electron-exchange process. The angular distribution for process (3) is consistent with the reaction proceeding via the 1 3 Ʃ u repulsive triplet state. The large fraction of the capture reactions proceeding this way (70%), is reasonable considering the high probability of formation in the triplet state. The large values of the cross-sections for processes other than simple dissociation account, in part, for the considerable discrepancies between the results of other workers.

Charge transfer in collisions involving symmetric and asymmetric resonance

1962 ◽  
Vol 268 (1335) ◽  
pp. 527-536 ◽  
Keyword(s):  
Charge Transfer ◽  
Energy Dependence ◽  
Cross Sections ◽  
Atomic Hydrogen ◽  
Zero Energy ◽  
Crossed Beams ◽  
The Cross ◽  
Resonance Charge ◽  
Symmetric Resonance

The cross-sections for charge transfer in collisions between atomic hydrogen and O + and He 2+ ions are presented. Unique interest attaches to these processes because they may occur with small or zero energy defect. Theoretical conflict exists regarding the magnitude and energy dependence of the cross-sections for accidental resonance collisions; the present work was prompted by the need for further information. Cross-sections for symmetric resonance charge transfer between protons and atomic hydrogen are also presented for energies down to 20 eV. The experiments were carried out by means of the techniques of modulated crossed beams.

THE NEAR-THRESHOLD PRODUCTION OF ϕ-MESONS IN PROTON–NUCLEON COLLISIONS

2007 ◽  
Vol 22 (02n03) ◽  
pp. 317-324 ◽  
Author(s):  
◽  
M. Hartmann ◽  
Y. Maeda ◽  
I. Keshelashvili ◽  
S. Barsov ◽  
...  
Keyword(s):  
Energy Dependence ◽  
Cross Section ◽  
Cross Sections ◽  
Entrance Channel ◽  
Significant Enhancement ◽  
Total Cross Sections ◽  
Deuterium Target ◽  
The Cross ◽  
Near Threshold

The pp → ppϕ and quasi–free pn → dϕ reactions have been studied at the Cooler Synchrotron COSY–Jülich, using the internal beam and the ANKE facility. Total cross sections in the pp entrance channel have been determined at three excess energies ∊ in the range of 18.5–75.9 MeV. In case of the pn entrance channel the energy dependence of the cross section up to 80 MeV has been extracted by exploiting the intrinsic momentum of the neutron inside a deuterium target. Taken together with data for ω–production, a significant enhancement of the ϕ/ω ratio for both entrance channels of a factor 8 is found compared to predictions based on the Okubo–Zweig–Iizuka rule.

Präzise Messung der totalen Wirkungsquerschnitte von Wismut, Blei, Silizium und Kohlenstoff für 130 eV-Neutronen

1971 ◽  
Vol 26 (3) ◽  
pp. 442-450 ◽  
Author(s):  
W. Dilg ◽  
H. Vonach
Keyword(s):  
Interaction Energy ◽  
Energy Dependence ◽  
Cross Sections ◽  
Resonance Method ◽  
Electron Interaction ◽  
Transmission Measurement ◽  
Nuclear Scattering ◽  
The Cross ◽  
Scattering Lengths ◽  
Bismuth Lead

Abstract A precise transmission measurement of the cross sections of Bismuth, Lead, Silicone and Carbon for 130 eV neutrons (Co-resonance) has been carried out. A new resonance method has been applied, using epithermal reactor neutrons, which have been scattered twice from Co-foils. - We obtained the total 130 eV cross sections: Bi: 9,182 ± 0,007 b, Pb: 11,295 ± 0,009 b, Si:2,0442 ± 0,0018 b, C: 4,746 ± 0,007 b. From these results the coherent nuclear scattering lengths (bound), Bi: 8,646 ± 0,005 fm, Pb : 9,524 ± 0,004 fm, C: 6,660 ± 0,006 fm, have been calculated, under consideration of various corrections (absorption, Schwinger-scattering, Incoherence, Neutron-Electron-Interaction, energy-dependence of nuclear-scattering).

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