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Threshold behaviour of L x-ray excitation in Xe-Ag collisions'f

By H Lutzs, W R Mcmurrays, R Pretoriusl, T Moroviks, B Frickes and I J Van Heerdent


Abstract. In the collision system Xe-Ag, the thresholds for excitation of quasimolecular L radiation and characteristic Ag L radiation have been found to lie at about 5 MeV and 1 MeV, respectively. These results are discussed on the basis of ab initio calculations of the screened interaction potential and the electron-correlation diagram. Relativistic Dirac-Slater molecular calculations have been shown to give a good account of the spectral shape of x-radiation excited in collisions between very heavy particles (Fricke et al 1976, Lutz et a1 1976, Morovik et a1 1977). It has been suggested that observation of the threshold behaviour of the excited radiation should provide a check on the details of the theoretical correlation diagrams, e.g., the location of individual level crossings (cf Lutz et al (1976) for the Xe-Au system). In this paper we report on an experimental investigation of the Xe-Ag collision system at and below 9 MeV ion energy, the molecular correlation diagram of which has been calculated by Morovik et al (1977). A collimated beam of Xe ' ions from the SUN1 6MV van de Graaff accelerator (energy calibrated using an NMR probe in the 90 " deflection magnet) was directed onto thin Ag targets (- 50 pg cm-') evapor

Year: 1978
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