PRODUCTION CROSS-SECTIONS AND YIELDS OF LONG-LIVED TI-44 FROM 100 MEVPROTON-BOMBARDMENT OF VANADIUM

The excitation function was measured using the stacked foil technique for the formation of Ti-44 in proton induced reactions on a vanadium t arget over the energy range 54-100 MeV. The maximum cross section (0.6 6+/-0.13) mb was observed at (79+/-2) MeV. The error was estimated to be +/-20%. The experimental results are compared with theoretical calc ulations based on the hybrid model of nuclear reactions using the comp uter code Overlaid Alice. The calculated values are consistently highe r than the experimental data. The production yield of Ti-44 was estima ted from the excitation function to be 0.015 mu Ci/mu Ah (540 Bq/mu Ah ) for a 7.7 g/ cm(2) thick vanadium target with a proton entrance ener gy of 99.5 MeV and exit energy 53.4 MeV after an elapsed time of 1 yea r from EOB to allow for the decay of shorter lived radioactivities.