Direct detection of delayed high energy electrons from the 181 Ta target irradiated by a moderate intensity femtosecond laser pulse

A. Savel’ev, O. Chefonov, A. Ovchinnikov, M. Agranat, K M Spohr

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Abstract

We depict an experimental study of delayed fast, negatively charged particles from femtosecond laser-plasma interaction at an intensity of I ∼ 10 17 W cm −2 . Plates of 2 mm thickness made of 181 Ta (∼100% abundance) and natural W were used as targets. We distinguished certain delayed events due to detection of negative H − , C − and O − ions. However, most events which were delayed by 0.5–5 μ s with respect to the instantaneous plasma formation caused by the laser pulses, were identified as electrons with energies of 3–7 keV. A comparative analysis between the tantalum and tungsten spectra was undertaken. This revealed a close similarity between the measured spectrum for tantalum and the predicted spectrum for electrons arising from to the internal conversion decay of the 6.237 keV nuclear isomeric state in 181 Ta.
Original languageEnglish
Article number035004
Number of pages7
JournalPlasma Physics and Controlled Fusion
Volume59
Issue number3
Early online date16 Dec 2016
DOIs
Publication statusPublished - 30 Jan 2017

Keywords

  • femtosecond plasma
  • moderate intensity
  • isomeric nuclear levels
  • internal conversion

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