Abstract
Absolute cross-sections and some thick target recoil properties have been measured for the production of 43–49Sc in uranium bombarded with protons of 590 MeV and 18 GeV, using radiochemical and electromagnetic isotope separation techniques. The yield of the neutron-deficient isotopes 43Sc and 44Sc increased by about a factor of 10 relative to 49Sc when the proton energy was increased from 590 MeV to 18 GeV. The average kinetic energy of the products calculated from the recoil results was 79 ± 4 MeV for both neutron-rich and neutron-deficient products at 590 MeV proton energy. At 18 GeV, the average kinetic energy of the neutron-rich products was 52·7 ± 1·0 MeV, whereas the kinetic energy of the most neutron-deficient product observed, 43Sc, had decreased to only 34·6 ± 1·0 MeV. New determinations of the half-lives of seven scandium isotopes were made on isotopically separated samples.
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