Proton radioactivity from 141 Ho and 131 Eu has been identified. The 141 Ho proton transition has an energy E p 1169͑8͒ keV, a half-life t 1͞2 4.2͑4͒ ms, and is assigned to the decay of the 7͞2 2 ͓523͔ Nilsson state. The 131 Eu transition has an energy E p 950͑8͒ keV and a half-life of 26(6) ms, consistent with decay from either the 3͞2 1 ͓411͔ or 5͞2 1 ͓413͔ Nilsson orbital. The proton decay rates deviate significantly from calculations assuming spherical configurations, and thus indicate the onset of large deformations in the region of the proton drip line below Z 69. [S0031-9007(98)

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The excitation function for fusion evaporation in the (60)Ni+ (89)Y system was measured over a range in cross section covering 6 orders of magnitude. The cross section exhibits an abrupt decrease at extreme sub-barrier energies. This behavior, which is also present in a few other systems found in the literature, cannot be reproduced with present models, including those based on a coupled-channels approach. Possible causes are discussed, including a dependence on the intrinsic structure of the participants.

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