Abstract
In recent years, we have studied the structure of transcurium nuclei using the best available actinide sources and state-of-the-art instruments. These include the largest amount of high-purity samples produced in the High Flux Isotope Reactor (HFIR) at Oak Ridge National Laboratory and the GAMMASPHERE spectrometer located at Argonne. Proton single-particle states in 249Bk were investigated by measuring the γ-ray spectra of an extremely pure 253Es sample and reactor-produced 249Cm sources. Neutron single-particle states were identified in 251Cf by measuring γ-ray spectra of 255Fm sources and a cyclotron-produced 251Es source. By combining the results of these measurements with the results of one-nucleon transfer reactions, we were able to identify almost all the single-particle states up to 1 MeV excitation in 249Bk and 251Cf. The level energies in these nuclei are in good agreement with energies calculated with a Woods–Saxon potential and pairing interactions.
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