K-Ionization probability across the 460-keV12C(p, p 0) resonance

Abstract

We have remeasured theK-shell vacancy production probabilityP K across the 460-keV12C(p, p0) resonance, previously investigated by Duinker et al. We are unable to confirm the large (∼70 %) variation ofP K across the resonance, found by Duinker et al. for protons elastically scattered at 125°. Our values for the ratioP K (142°)/P K (16°) are independent (within±20%) of the proton bombarding energy over the resonance region, in agreement with theoretical predictions by Blair and Anholt, Feagin and Kocbach, McVoy and Weidenmuller. Our average value for this ratio, equal to 0.88 ±0.06, agrees with the value 0.88 calculated by Amundsen and Aashamar.