Soft- and hard-photon emission from pair annihilation in laser field

2016 ◽  
Author(s):  
O. I. Denisenko
Keyword(s):  
Laser Field ◽  
Photon Emission ◽  
Hard Photon ◽  
Pair Annihilation

Hard-photon emission inXe129+197Au reaction at 44 MeV/nucleon

1993 ◽  
Vol 48 (6) ◽  
pp. 2926-2930 ◽  
Author(s):  
Giuseppe Russo
Keyword(s):  
Photon Emission ◽  
Hard Photon

scholarly journals HIGH FREQUENCY BEHAVIOR OF THE MAXWELL–BLOCH MODEL WITH RELAXATION: CONVERGENCE TO THE SCHRÖDINGER-RATE SYSTEM

2012 ◽  
Vol 09 (03) ◽  
pp. 355-401
Author(s):  
F. CASTELLA ◽  
E. DUMAS
Keyword(s):  
Electromagnetic Field ◽  
High Frequency ◽  
Laser Field ◽  
Energy Levels ◽  
Photon Emission ◽  
Classical Equation ◽  
Atomic Energy ◽  
Mathematical Framework ◽  
Rate System ◽  
Atomic Energy Levels

We study the Maxwell–Bloch model, which describes the propagation of a laser through a material and the associated interaction between laser and matter (polarization of the atoms through light propagation, photon emission and absorption, etc.). The laser field is described through Maxwell's equations, a classical equation, while matter is represented at a quantum level and satisfies a quantum Liouville equation known as the Bloch model. Coupling between laser and matter is described through a quadratic source term in both equations. The model also takes into account partial relaxation effects, namely the trend of matter to return to its natural thermodynamic equilibrium. The whole system involves 6 + N(N + 1)/2 unknowns, the six-dimensional electromagnetic field plus the N(N + 1)/2 unknowns describing the state of matter, where N is the number of atomic energy levels of the considered material. We consider at once a high frequency and weak coupling situation, in the general case of anisotropic electromagnetic fields that are subject to diffraction. Degenerate energy levels are allowed. The whole system is stiff and involves strong nonlinearities. We show the convergence to a nonstiff, nonlinear, coupled Schrödinger-rate model, involving 3 + N unknowns. The electromagnetic field is eventually described through its envelope, one unknown vector in ℂ3. It satisfies a Schrödinger equation that takes into account propagation and diffraction of light inside the material. Matter on the other hand is described through a N-dimensional vector describing the occupation numbers of each atomic level. It satisfies Einstein's rate equation that describes the jumps of the electrons between the various atomic energy levels, as induced by the interaction with light. The rate of exchange between the atomic levels is proportional to the intensity of the laser field. The whole system is the physically natural nonlinear model. In order to provide an important and explicit example, we completely analyze the specific (two-dimensional) Transverse Magnetic case, for which formulae turn out to be simpler. Technically speaking, our analysis does not enter the usual mathematical framework of geometric optics: it is more singular, and requires an ad hoc Ansatz.

scholarly journals Hard-Photon Emission in High Energy  e Scatterings

1981 ◽  
Vol 66 (6) ◽  
pp. 2234-2248 ◽  
Author(s):  
K.-i. Aoki ◽  
Z. Hioki
Keyword(s):  
Photon Emission ◽  
High Energy ◽  
Hard Photon

Lepton pair productions with double hard photon emission

1993 ◽  
Vol 304 (1-2) ◽  
pp. 189-192 ◽  
Author(s):  
A. Fujimoto ◽  
T. Kaneko ◽  
Y. Kurihara ◽  
D. Perret-Gallix ◽  
Y. Shimizu
Keyword(s):  
Photon Emission ◽  
Lepton Pair ◽  
Hard Photon

scholarly journals Vector Boson Pair Productions with a Hard Photon Emission

1992 ◽  
Vol 88 (1) ◽  
pp. 103-110
Author(s):  
K. Fujii ◽  
J. Fujimoto ◽  
J. Kanzaki ◽  
Y. Kurihara ◽  
A. Miyamoto ◽  
...  
Keyword(s):  
Vector Boson ◽  
Photon Emission ◽  
Hard Photon ◽  
Boson Pair

Hard-Photon Emission from Colliding Nuclei

1986 ◽  
Vol 2 (1) ◽  
pp. 9-16 ◽  
Author(s):  
E Grosse ◽  
P Grimm ◽  
H Heckwolf ◽  
W. F. J Müller ◽  
H Noll ◽  
...  
Keyword(s):  
Photon Emission ◽  
Hard Photon

Two-photon emission of an electron in the weak pulsed laser field for the resonant case

Laser Physics ◽  
2017 ◽  
Vol 27 (2) ◽  
pp. 026003 ◽  
Author(s):  
V N Nedoreshta ◽  
A I Voroshilo ◽  
S P Roshchupkin ◽  
V V Dubov
Keyword(s):  
Laser Field ◽  
Photon Emission ◽  
Pulsed Laser ◽  
Resonant Case ◽  
Two Photon

scholarly journals Hard-photon emission in with realistic cuts

1999 ◽  
Vol 456 (2-4) ◽  
pp. 264-269 ◽  
Author(s):  
P.CH. Christova ◽  
M. Jack ◽  
T. Riemann
Keyword(s):  
Photon Emission ◽  
Hard Photon
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