Long-term α- and spontaneous fission measurement of a Rf/Db sample chemically prepared in a 48Ca on 243Am experiment

Results from long-term measurements of a chemically separated Db/Rf sample prepared from the products of a 48 Ca on 243 Am irradiation are presented. The sample with the highest spontaneous fission activity out of eight samples produced in the course of chemical experiments performed in 2004 was selected for these measurements. We conclude that there is no evidence for SF-decay originating from heavy actinide isotopes in this sample. Hence, it is appropriate to assign the SF-events observed in this experiment to decay products of 288 115.