K-SHELL IONIZATION PROBABILITIES OF Cu BY PROTON IMPACT AT ENERGIES OF 400 keV TO 600 keV

Abstract
Measurements of impact parameter dependent ionization probabilities for the K-shell of Cu by proton impact have been performed by detection of coincidences between characteristic X-rays and scattered projectiles. The use of the organic scintillator Ne102A for X-ray detection drastically improved the timing resolution of the coincidence system compared to NaI(T1) or Si(Li) detectors normally used. This made possible the measurement of 9 data points with experimental errors of 17-20 % within accelerator times of 6-14 hours per data point. The energy range (400-600 keV) and scattering angles of the projectiles (90°, 135°, 164°) have been chosen to investigate the influence of the recoil of the target nucleus on ionization probability. The experimental results are compared to theoretical predictions and agree with SCA-calculations if the recoil of the target nucleus is included.