0000000000713714
AUTHOR
W. F. W. Schneider
Influence of Collective Surface Motion on the Threshold Behavior of Nuclear Fusion
Fusion excitation functions for the systems $^{40}\mathrm{Ar}$+$^{112,116,122}\mathrm{Sn}$ and $^{40}\mathrm{Ar}$+$^{144,148,154}\mathrm{Sm}$ have been determined, covering cross sections ranging from several hundred millibarns down to the microbarn level. The data are interpreted with a fusion model that includes fluctuations of the barrier with an amplitude that is shown to be correlated with the collective surface properties of the nuclei. There is no need to assume an additional enhanced tunneling process.
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 $Z=116$, $A=296$ as low as possible. No evidence for superheavy nuclei was obtained in a half-life region from 1 \ensuremath{\mu}s to 10 yr with a production cross section greater than ${10}^{\ensuremath{-}34}$ to ${10}^{\ensuremath{-}35}$ ${\mathrm{cm}}^{2}$.