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The angular distribution and energy spectra of energetic protons emitted from a 5-μm thick copper tape target irradiated by p-, circularly-, and s-polarized 55-fs laser pulses with intensity of 8–9×1018 W/cm2 are measured. The protons are found in the rear target normal direction while the hot electrons are found in the laser propagation direction. The maximum energy of protons is equal to 1.34 MeV...
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