scholarly journals High-Energy Deuteron Cross Sections: Charge-Exchange Effects

1967 ◽  
Vol 156 (5) ◽  
pp. 1685-1697 ◽  
Author(s):  
R. J. Glauber ◽  
Victor Franco
Keyword(s):  
Charge Exchange ◽  
Cross Sections ◽  
High Energy ◽  
Exchange Effects

ππ and π– p → π0n Scattering in a Multiple-Reggeon-Cut Dual Absorptive Model

1976 ◽  
Vol 31 (6) ◽  
pp. 557-564
Author(s):  
W. Braun
Keyword(s):  
Charge Exchange ◽  
Cross Sections ◽  
Resonance Region ◽  
High Energy ◽  
Energy Data ◽  
Free Parameters ◽  
Absorptive Amplitude

A dual absorptive amplitude, in which s-channel resonances are generated by summing up t-channel n-Reggeon cuts, is constructed. Adjusting the two free parameters of the model in the resonance region of π π scattering, the various π π differential high energy cross sections are calculated. The model is also applied to π N charge exchange, where a fit to the high energy data is obtained even without Reggeon-Pomeron cuts

On the calculation of charge-exchange effects in a relativistic model for (γ n) reactions

2001 ◽  
Vol 79 (10) ◽  
pp. 1223-1230
Author(s):  
G M Lotz ◽  
H S Sherif
Keyword(s):  
Charge Exchange ◽  
Cross Sections ◽  
Mean Field ◽  
Transition Amplitude ◽  
Wave Functions ◽  
Meson Exchange ◽  
Relativistic Model ◽  
Exchange Contribution ◽  
Charge Exchange Reaction ◽  
Exchange Effects

The charge-exchange contribution to photoneutron emission is calculated in a relativistic model. The emission is regarded as a two-step process consisting of a direct electromagnetic knockout of a proton followed by a (p,n) charge-exchange reaction. The latter step is effected by the isovector components of the scalar and vector mean field optical potentials. A novel procedure, in which the pertinent integral is reduced to a simpler integral in combination with a differential equation, is adopted to evaluatethe transition amplitude. We find that the charge-exchange contribution is comparable in magnitude to the direct contribution over a range of photon energies. There is some dependence on the optical and binding potentials used to calculate nucleon wave functions. As expected, the sum of direct and charge-exchange contributions is not sufficient to account for the observed cross sections, confirming the importance of including meson exchange and isobar currents. PACS Nos.: 25.20Lj, 25.40Kv, 24.10Jv

scholarly journals Total cross sections of eγ → $$ eX\overline{X} $$ processes with X = μ, γ, e via multiloop methods

2021 ◽  
Vol 2021 (1) ◽  
Author(s):  
Roman N. Lee ◽  
Alexey A. Lyubyakin ◽  
Vyacheslav A. Stotsky
Keyword(s):  
Cross Section ◽  
Cross Sections ◽  
Elliptic Integral ◽  
High Energy ◽  
Calculation Methods ◽  
Complete Elliptic Integral ◽  
Total Cross Sections ◽  
Multiloop Calculation ◽  
The Cross ◽  
Analytical Expressions

Abstract Using modern multiloop calculation methods, we derive the analytical expressions for the total cross sections of the processes e−γ →$$ {e}^{-}X\overline{X} $$ e − X X ¯ with X = μ, γ or e at arbitrary energies. For the first two processes our results are expressed via classical polylogarithms. The cross section of e−γ → e−e−e+ is represented as a one-fold integral of complete elliptic integral K and logarithms. Using our results, we calculate the threshold and high-energy asymptotics and compare them with available results.

SPALLATION YIELDS FROM HIGH ENERGY PROTON BOMBARDMENT OF HEAVY ELEMENTS

1957 ◽  
Vol 35 (1) ◽  
pp. 21-37 ◽  
Author(s):  
J. D. Jackson
Keyword(s):  
Cross Sections ◽  
High Energy ◽  
Heavy Elements ◽  
Collective Effects ◽  
Comparison With Experiment ◽  
Energy Proton ◽  
Stringent Test ◽  
Neutron Evaporation ◽  
Nuclear Processes ◽  
Mev Protons

The Monte Carlo calculations of McManus and Sharp (unpublished) for the prompt nuclear processes occurring upon bombardment of heavy elements by 400 Mev. protons are combined with a description of the subsequent neutron evaporation to determine spallation cross sections for comparison with experiment. The model employed is a schematic one which suppresses the detailed characteristics of individual nuclei, but gives the over-all behavior to be expected. Many-particle and collective effects such as alpha particle emission and fission are ignored. The computed cross sections are presented in a variety of different graphical forms which illustrate quantitatively the qualitative picture of high energy reactions first given by Serber (1947). The calculations are in general agreement with existing data when fission is not an important effect, but the agreement does not imply a very stringent test of the various features of the model.

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