Soft X-Ray Production by 1.5-MeV Protons

Abstract

Thick-target yields of x rays with wavelengths from 1.5 to 44 \AA{} have been measured as functions of bombarding proton energy near 1.5 MeV. X-ray production cross sections computed from these yields are in satisfactory agreement with existing theoretical excitation cross-section calculations insofar as current estimates of fluorescence yields permit comparisons to be made. Yields at 1.5 MeV of the ultrasoft x rays measured were, in quanta per proton steradian: ${\mathrm{Al}}_{K}$, 3.5\ifmmode\times\else\texttimes\fi{}${10}^{\ensuremath{-}3}$; ${\mathrm{Cu}}_{L}$, 9\ifmmode\times\else\texttimes\fi{}${10}^{\ensuremath{-}4}$; ${\mathrm{C}}_{K}$, 4.5\ifmmode\times\else\texttimes\fi{}${10}^{\ensuremath{-}3}$.