Mass and Energy Distributions from 77.3-MeV -He4-Induced Fission ofTa181,Bi209, andU233: A Test of Liquid-Drop - Model Predictions
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Abstract
Thin targets of $^{181}\mathrm{Ta}$, $^{209}\mathrm{Bi}$, and $^{233}\mathrm{U}$ have been bombarded with 77.3-MeV $^{4}\mathrm{He}$ ions at the Oak Ridge isochronous cyclotron. Correlated measurements of kinetic energies of fission-fragment pairs have been made, and mass and total kinetic energy distributions were obtained. The widths of the distributions were compared with predictions of the liquid-drop model for fission. The trends predicted by theory were observed, but the absolute magnitude of the distribution widths were not in agreement with liquid-drop-model predictions. It is concluded that the liquid-drop model describes fission of relatively light nuclei in general terms, but that it should not be used in those cases where accurate quantitative predictions are required.
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