Stopping power of heavy ions (22<= Z1 <= 28) in Au and Ge

Full text: Accurate prediction of heavy ion stopping at low energies is necessary in nuclear structure physics, with the Doppler Shift Attenuation Method (DSAM). In this technique, knowledge of stopping power is used to determine a timescale for the decaying nuclei while slowing down in a heavy substrate, usually Au. Since ab initio calculations are unable to produce reliable estimates, most models currently in use are of semiempirical nature. Regarding to low energies this is especially true due to additional difficulties arising from a complicated dependence on atomic numbers of stopper medium and projectile ion. The main aim of this contribution is to present new experimental data for Ti, V, Cr, Co and Ni ions slowing down in Ge and Au in the energy range from 5 to 20 MeV. Experimental data for Ti, V, Cr ions were obtained using the elastic scattering technique, where a primary beam is used to scatter heavy ions from a thin target (∼ 100 μg/cm2). The scattered primary beam produces recoiling atoms of the target at low energies at a given direction. Experimental data for Co and Ni ions were measured using a ToF-E apparatus (Time of Flight - Energy detection system) which allows measuring stopping over a continuous energy range. Our experimental data were compared to current models addressed to low energies. (author)