Calculation of the cross section fore+-e−(Korbit) pairs by very-high-energy fully stripped heavy ions at perturbational impact parameters

1993 ◽  
Vol 48 (3) ◽  
pp. 2002-2011 ◽  
Author(s):  
A. J. Baltz ◽  
M. J. Rhoades-Brown ◽  
J. Weneser
Keyword(s):  
Cross Section ◽  
Heavy Ions ◽  
High Energy ◽  
Very High Energy ◽  
Impact Parameters ◽  
The Cross ◽  
Very High

scholarly journals Cross section to multiplicity ratios at very high energy

2014 ◽  
Vol 734 ◽  
pp. 207-209 ◽  
Author(s):  
M.M. Block ◽  
L. Stodolsky
Keyword(s):  
Cross Section ◽  
High Energy ◽  
Very High Energy ◽  
Very High

Radiation Effect on the Viscosity of the Simple B2O3 Glasses

1997 ◽  
Vol 504 ◽  
Author(s):  
A. Barbu ◽  
G. Jaskierowicz
Keyword(s):  
Heavy Ions ◽  
Radiation Effect ◽  
Glass Fibers ◽  
Heavy Ion ◽  
High Energy ◽  
High Energy Electron ◽  
Very High Energy ◽  
Radiation Induced ◽  
Very High ◽  
Creep Velocity

ABSTRACTThe creep velocity of B203 glass fibers under irradiation with 2.5 MeV electrons at low flux ( around 5 1013 e-cm−2s−1) has been studied versus temperature. As under very high energy heavy ions irradiation (1.6 GeV argon), the viscosity is drastically reduced below 300°C. An important difference between the two kinds of irradiation is the occurrence of a compaction phenomenon at the beginning of electron irradiation experiments. The results can be understood by assuming two totally different mechanisms: a relaxation driven by melting of the glass along the path of the ions for very high energy heavy ion irradiations and a relaxation driven by individual radiation induced points defects for high energy electron irradiations.

PROCESSES WITH LARGE IMPACT PARAMETERS AT COLLIDING BEAMS

1992 ◽  
Vol 07 (20) ◽  
pp. 4707-4745 ◽  
Author(s):  
G.L. KOTKIN ◽  
V.G. SERBO ◽  
A. SCHILLER
Keyword(s):  
Cross Section ◽  
Particle Production ◽  
Single Photon ◽  
High Energy ◽  
Distribution Functions ◽  
Large Impact ◽  
Beam Polarization ◽  
Quantum Distribution ◽  
Impact Parameters ◽  
The Cross

At the collider VEPP-4 a remarkable deviation of the measured bremsstrahlung photons from the standard calculation method has been measured in the reaction e+e−→e+e−γ. The decreasing number of photons is explained by the fact that large impact parameters give the essential contributions to the cross section. These parameters are by several orders of magnitude larger than the transverse beam sizes. In that case the standard definitions of “cross section” and “number of events” are invalid. Similar effects are expected for the single photon bremsstrahlung and the e+e− pair production at existing and planned high energy e±e−, ep and eγ colliders. A calculation scheme for particle production in the interaction of two bunches, which allows one to take into account these effects quantitatively, is presented. In this scheme the colliding bunches are represented as wave packets, and quantum distribution functions are used. The modified definitions of the cross section and the number of events contain the features of “nonlocality” and “interference”. Reasonable approximations which can be easily used are discussed. The results are applied to analyze the influence of the finite beam sizes on reactions which have been proposed for measuring the luminosity and the beam polarization at the colliders LEP and HERA.

scholarly journals Empirical determination of the very high energy heavy quark cross section from nonaccelerator data

1994 ◽  
Vol 49 (5) ◽  
pp. 2310-2315 ◽  
Author(s):  
M. C. Gonzalez-Garcia ◽  
F. Halzen ◽  
R. A. Vázquez ◽  
E. Zas
Keyword(s):  
Heavy Quark ◽  
Cross Section ◽  
High Energy ◽  
Empirical Determination ◽  
Very High Energy ◽  
Very High

Disordering Induced by very High Energy Heavy Ions in Metallic Compounds

1992 ◽  
pp. 295-299 ◽  
Author(s):  
A. Barbu ◽  
A. Dunlop ◽  
D. Lesueur ◽  
G. Jaskierowicz
Keyword(s):  
Heavy Ions ◽  
High Energy ◽  
Very High Energy ◽  
Metallic Compounds ◽  
Very High

scholarly journals Total photoproduction cross section at very high energy

2009 ◽  
Vol 63 (1) ◽  
pp. 69-85 ◽  
Author(s):  
R. M. Godbole ◽  
A. Grau ◽  
G. Pancheri ◽  
Y. N. Srivastava
Keyword(s):  
Cross Section ◽  
High Energy ◽  
Photoproduction Cross Section ◽  
Very High Energy ◽  
Very High

GAMMA RAYS FROM THE DEUTERON BOMBARDMENT OF BORON 10

1955 ◽  
Vol 33 (12) ◽  
pp. 828-840 ◽  
Author(s):  
J. T. Sample ◽  
G. C. Neilson ◽  
G. B. Chadwick ◽  
J. B. Warren
Keyword(s):  
Energy Level ◽  
Cross Section ◽  
Gamma Rays ◽  
High Energy ◽  
Crystal Spectrometer ◽  
Upper Limit ◽  
Very High Energy ◽  
Deuteron Bombardment ◽  
Bombarding Energy ◽  
Very High

Bombardment of B10 with 1.4 Mev. deuterons has been found to produce gamma rays of energy 4.46 ±.04, 4.75 ±.03, 5.03 ±.09, 5.35 ±.05, 6.52 ±.04, 6.78 ±.07, 7.29 ±.04, 8.27 ±.09, and 8.87 ±.02 Mev., as measured with a three-crystal pair spectrometer. Tentative assignments to transitions in B11 and C11 agree well in most cases with the known energy level schemes. No gamma rays of very high energy were observed, even with a single-crystal spectrometer; consequently an upper limit of 10−31 cm.2 has been placed on the cross-section of B10(d, γ)C12 at 0.95 Mev. bombarding energy.

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