New Insights into the Am243+Ca48 Reaction Products Previously Observed in the Experiments on Elements 113, 115, and 117

Results of a new series of experiments on the study of production cross sections and decay properties of the isotopes of element 115 in the reaction Am243+Ca48 are presented. Twenty-one new decay chains originating from 115288 were established as the product of the 3n-evaporation channel by measuring the excitation function at three excitation energies of the compound nucleus 115291. The decay properties of all newly observed nuclei are in full agreement with those we measured in 2003. At the lowest excitation energy E^*=33MeV, for the first time we registered the product of the 2n-evaporation channel, 115289, which was also observed previously in the reaction Bk249+Ca48 as the daughter nucleus of the decay of 117293. The maximum cross section for the production of 115288 is found to be 8.5 pb at E^*≈36MeV.