Studies of nuclei at and beyond the proton drip-line with stable and radioactive beams at HRIBF

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Investigations of nuclei in the proton drip-line region performed at the Holifield Radioactive Ion Beam Facility (HRIBF) within the last two years are reviewed. In particular, the discovery of five new proton radioactivities 140Ho, 141mHo, 145Tm, 150mLu and 151mLu is discussed. These proton emitters were produced by means of fusion-evaporation reactions and studied with a Recoil Mass Separator and a Double-sided Silicon Strip Detector. For 113Cs and 151Lu, the studies of level structure were extended beyond the proton-emitting states via the measurements with a clover array CLARION using Recoil Decay Tagging. The plan to use a fusion-evaporation reaction with a radioactive 69As beam developed at HRIBF, in order to study the decay of a new beta-delayed proton emitter 125Nd, is also described.

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Acta Physica Polonica B

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