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Production and Assignment of a New Transuranium Neutron-Deficient Isotope 235Am

A new transuranium neutron-deficient isotope 235Am was produced via the reaction of 238Pu(p, 4n) 235Am by using a 35 MeV proton beam. The recoiled products were collected by a heliumjet and long-capillary system. Americium isotopes were separated out by a rapid radiochemical method. X-ray, γ-ray, and x-γ coincidence measurements were taken in the study. According to 235Pu decay γ-ray and Np K x-ray growth-decay property, 235Am was definitely identified and its half life is determined as 15 ± 5 min.