Attempts to Produce Superheavy Elements by Fusion ofCa48withCm248in the Bombarding Energy Range of 4.5-5.2 MeV/u

A search for superheavy elements was made in bombardments of ${}_{}{}^{248}{}_{}{}^{}\mathrm{Cm}$ with ${}_{}{}^{48}{}_{}{}^{}\mathrm{Ca}$ ions performed at projectile energies close to the interaction barrier in order to keep the excitation energy of the compound nucleus $Z=116\mathrm{}$, $A=296\mathrm{}$ as low as possible. No evidence for superheavy nuclei was obtained in a half-life region from 1 μs to 10 yr with a production cross section greater than ${10}^{-34\mathrm{}}$ to ${10}^{-35\mathrm{}}$ ${\mathrm{cm}}^2$.