We investigate the possibilities of the formation of even-even superheavy nuclei in the cold fusion reactions ${}^{207}{\mathrm{Pb}}_{125}(\mathrm{HI},1n)$. We reproduce the measured cross sections of the reactions ${}^{207}{\mathrm{Pb}}_{125}{(}^{50}{\mathrm{Ti}}_{28},1n{)}^{256}{\mathrm{Rf}}_{152}$, ${}^{207}{\mathrm{Pb}}_{125}{(}^{54}{\mathrm{Cr}}_{30},1n{)}^{260}{\mathrm{Sg}}_{154}$, and ${}^{207}{\mathrm{Pb}}_{125}{(}^{58}{\mathrm{Fe}}_{32},1n{)}^{264}{\mathrm{Hs}}_{156}$ within a factor of 2.9 on average. We predict the optimal bombarding energies and the formation cross sections of even-even superheavy nuclei with $Z=110\mathrm{}–120$.

• Received 16 August 1999

DOI:https://doi.org/10.1103/PhysRevLett.83.4705