Abstract
To further understand and investigate the possibility of larger than expected survival rates for heavy nuclei formed by “hot fusion” techniques with actinide targets, an experiment to measure competition between neutron emission and fission in 258No and 257No formed by the reactions 232Th+26Mg and 232Th+25Mg at excitation energies of E*≈60 MeV was performed at the The Svedberg Laboratory in Uppsala, Sweden. Approximately 220,000 and 90,000 fission events were recorded from the 26Mg+232Th and 25Mg+232Th reactions, respectively. Preliminary analysis does not indicate an anomalously large value of Γn/Γf for first chance fission of 258No.
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