Observation of high-energy electrons from a metal target irradiated by protons with a mean energy of 25 keV |
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Authors: | G. V. Golovin A. B. Savel’ev D. S. Uryupina R. V. Volkov B. V. Mar’in |
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Affiliation: | (1) Faculty of Physics and International Laser Center, Moscow State University, Moscow, 119991, Russia;(2) Skobeltsyn Institute of Nuclear Physics, Moscow State University, Moscow, 119999, Russia |
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Abstract: | Electrons with abnormally high energies of up to 16 keV are detected from an iron target irradiated by ions (H+, Fe+, Fe2+, Fe3+) with energies ranging from 20 to 100 keV from the plasma of a high-power femtosecond laser pulse with an intensity of 1016 J/(s cm2). These electrons indicate that the energy of an incident ion is almost completely transferred to an electron knocked out of the target. In a range of 6–16 keV, the spectrum of electrons knocked out of the K shell of iron atoms by protons with an energy of 22 ± 2 keV is quasi-exponential with an exponent of 4 keV. For 8-keV electrons, the double differential cross section for ionization by such protons is estimated as 10?7 b/(eV sr). |
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