IMPACT-PARAMETER DEPENDENT L-K VACANCY-TRANSFER IN COLLISIONS OF NI23+ WITH GE SOLID TARGETS

Using a particle-photon coincidence technique, we have measured the in fluence of the solid target preparation and thickness on the target K- vacancy production probability (P-K(b)) in collisions of 3.6 MeV/u Ni2 3+ with Ge. The probabilities were measured as a function of the impac t parameter b which is calculated from the projectile scattering angle using a screened Bohr-type potential. For target thicknesses varying by more than a factor of 100, no change in the shape of the P-K(b) cur ve was found. Even the data obtained with implanted Ge targets(approxi mate to 1 x 10(16) atoms cm(-2)), used for the first time in an L-K va cancy-transfer experiment, showed the typical solid target behaviour w ith the adiabatic peak being shifted towards smaller impact parameters .