Total stopping power formulae for high energy electrons and positrons

1986 ◽  
Vol 16 (1) ◽  
pp. 1-4 ◽  
Author(s):  
P.B. Pal ◽  
V.P. Varshney ◽  
D.K. Gupta
Keyword(s):  
High Energy ◽  
Stopping Power ◽  
High Energy Electrons ◽  
Electrons And Positrons

scholarly journals Properties of Elementary Particle Fluxes in Primary Cosmic Rays Measured with the Alpha Magnetic Spectrometer on the International Space Station

2019 ◽  
Vol 209 ◽  
pp. 01007
Author(s):  
Francesco Nozzoli
Keyword(s):  
Electron Flux ◽  
Space Station ◽  
Cosmic Ray ◽  
High Energy ◽  
Precision Measurements ◽  
High Energy Electrons ◽  
Electrons And Positrons ◽  
Positron Flux ◽  
Rigidity Dependence ◽  
Alpha Magnetic Spectrometer

Precision measurements by AMS of the fluxes of cosmic ray positrons, electrons, antiprotons, protons as well as their rations reveal several unexpected and intriguing features. The presented measurements extend the energy range of the previous observations with much increased precision. The new results show that the behavior of positron flux at around 300 GeV is consistent with a new source that produce equal amount of high energy electrons and positrons. In addition, in the absolute rigidity range 60–500 GV, the antiproton, proton, and positron fluxes are found to have nearly identical rigidity dependence and the electron flux exhibits different rigidity dependence.

scholarly journals Quantum Mechanisms of Electron and Positron Acceleration through Nonlinear Compton Scatterings and Nonlinear Breit-Wheeler Processes in Coherent Photon Dominated Regime

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
Bo Zhang ◽  
Zhimeng Zhang ◽  
Zhi-gang Deng ◽  
Jian Teng ◽  
Shu-kai He ◽  
...  
Keyword(s):  
Charged Particles ◽  
High Energy ◽  
Low Energy ◽  
Electric Force ◽  
Quantum Processes ◽  
High Energies ◽  
Large Numbers ◽  
High Energy Electrons ◽  
Electrons And Positrons ◽  
Proof Of Principle

AbstractElectric force is presently the only means in laboratory to accelerate charged particles to high energies, corresponding acceleration processes are classical and continuous. Here we report on how to accelerate electrons and positrons to high energies using ultra intense lasers (UIL) through two quantum processes, nonlinear Compton scattering and nonlinear Breit-Wheeler process. In the coherent photon dominated regime of these two processes, the former can effectively boost electrons/positrons and the latter can produce high energy electrons and positrons with low energy γ photons. The energy needed for such quantum acceleration (QA) is transferred from large numbers of coherent laser photons through the two quantum processes. QA also collimate the generated high energy electrons and positrons along the laser axis and the effective acceleration distance is of microscopic dimensions. Proof of principle QA experiment can be performed on 100 petawatt (PW) scale lasers which are in building or planning.

scholarly journals Possible origin of the slow-diffusion region around Geminga

2019 ◽  
Vol 488 (3) ◽  
pp. 4074-4080 ◽  
Author(s):  
Kun Fang ◽  
Xiao-Jun Bi ◽  
Peng-Fei Yin
Keyword(s):  
Cosmic Ray ◽  
High Energy ◽  
Diffusion Region ◽  
Late Time ◽  
Slow Diffusion ◽  
Strong Turbulence ◽  
Streaming Instability ◽  
High Energy Electrons ◽  
Electrons And Positrons ◽  
Γ Ray

ABSTRACT Geminga pulsar is surrounded by a multiTeV γ-ray halo radiated by the high-energy electrons and positrons accelerated by the central pulsar wind nebula (PWN). The angular profile of the γ-ray emission reported by High-Altitude Water Cherenkov Observatory indicates an anomalously slow diffusion for the cosmic-ray electrons and positrons in the halo region around Geminga. In the paper we study the possible mechanism for the origin of the slow diffusion. At first, we consider the self-generated Alfvén waves due to the streaming instability of the electrons and positrons released by Geminga. However, even considering a very optimistic scenario for the wave growth, we find this mechanism does not work to account for the extremely slow diffusion at the present day, if taking the proper motion of Geminga pulsar into account. The reason is straightforward as the PWN is too weak to generate enough high-energy electrons and positrons to stimulate strong turbulence at the late time. We then propose an assumption that the strong turbulence is generated by the shock wave of the parent supernova remnant (SNR) of Geminga. Geminga may still be inside the SNR, and we find that the SNR can provide enough energy to generate the slow-diffusion circumstance. The TeV haloes around PSR B0656+14, Vela X, and PSR J1826-1334 may also be explained under this assumption.

ADVANCES IN COHERENT BREMSSTRAHLUNG AND LPM-EFFECT STUDIES

2010 ◽  
Vol 25 (supp01) ◽  
pp. 9-33 ◽  
Author(s):  
N. F. SHUL'GA
Keyword(s):  
Short Review ◽  
High Energy ◽  
Coherent Radiation ◽  
Relativistic Electrons ◽  
Main Attention ◽  
High Energy Electrons ◽  
Electrons And Positrons ◽  
Coherent Bremsstrahlung ◽  
Radiation Processes ◽  
Amorphous Media

2008 accomplished the 100th anniversary from the birth of L.D. Landau (Nobel Prize 1962). In the paper a short description of Kharkov period of Landau's work from 1932 to 1937 is given. One of areas of his work is connected with investigation of bremsstrahlung by ultra relativistic electrons in matter. In this paper a short review of the results obtained studying both Landau-Pomeranchuk-Migdal effect and coherent radiation by high-energy electrons and positrons in crystals, is given. The main attention is paid to the general properties and difference of radiation processes in amorphous media and in a crystal and to advances in the coherent bremsstrahlung studies.

Energy loss of relativistic electrons in plasma in accordance with covariant Fokker–Planck formalism

1980 ◽  
Vol 24 (1) ◽  
pp. 75-88 ◽  
Author(s):  
P. S. Ray
Keyword(s):  
Energy Loss ◽  
Green's Function ◽  
High Energy ◽  
Stopping Power ◽  
Function Technique ◽  
Relativistic Electrons ◽  
Relativistic Generalization ◽  
Ion Scattering ◽  
High Energy Electrons ◽  
Fokker Planck

A relativistic generalization of the Fokker–Planck formalism has been constructed. This is applied to the study of energy loss of high-energy electrons in plasma. Both the electron–electron and electron–ion scattering have been considered in a relativistic way. The expression obtained for the stopping power differs from that derived with the help of thermodynamic Green's function technique.

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