Photonuclear (γ, n) and (γ, p) reactions produced by 23 MeV. X-rays from a synchrotron have been used to prepare new radioactive isotopes, the method being particularly advantageous for neutron-excess isotopes in the region Z =63 to 79. Whenever possible the isotopes were chemically identified. The following Table summarizes the results Definite mass assignments, hitherto uncertain, have been made for 18-hour 159 Gd and 48-minute 200 Au.
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F.D.S. Butement (1951) studied this question.
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