Abstract
Several experiments were conducted at the 10 MV Van-de-Graaff tandem accelerator at the Institute of Nuclear Physics, Cologne, to detect proton emission from the isomeric 6457-keV 10^+ state in ^{54}hbox {Ni}. Excitation functions for two fusion–evaporation reactions were measured to maximise the population of the rare two-neutron evaporation channel from a ^{56}hbox {Ni} compound nucleus. The search for delayed proton emission was based on the ^{28}hbox {Si}(^{28}hbox {Si},2n)^{54}hbox {Ni} reaction at a beam energy of 70 MeV. For this reaction, a cross-section limit for the population of the 10^+ state in ^{54}hbox {Ni} and its proton-decay branch was determined to be sigma < 22 nb.
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