CXXXIX. The nuclear scattering of electrons and positrons at 10mev

Author(s):  
W. Bosley ◽  
I.S. Hughes

An experiment is described in which electrons and positrons are scattered, under identical conditions, at energies of 0·7 and 1·4 MeV by foils of aluminium, silver and gold. Both the incident and scattered particles are counted by making use of the fast response and good energy resolution of anthracene crystals. The incident beam, which is in the form of a divergent hollow cone of semi-vertical angle of near 10°, and of 5% energy spread, is provided by using radioactive sources in a β-ray spectrometer. Effective angles of scattering of 22·8, 34·5 and 47·5° are employed. It is concluded that, within the experimental accuracy of about ±5% , the results are in accordance with predictions of the Dirac theory.


2019 ◽  
Vol 209 ◽  
pp. 01007
Author(s):  
Francesco Nozzoli

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.


Author(s):  
Alexander Zholents ◽  
Luca Rebuffi ◽  
Xianbo Shi

2021 ◽  
Vol 103 (5) ◽  
Author(s):  
Anh Dung Le ◽  
Alfred H. Mueller ◽  
Stéphane Munier
Keyword(s):  

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