Abstract
Fission-fragment angular distributions in reactions of $^{10}\mathrm{B}$, $^{12}\mathrm{C}$, $^{16}\mathrm{O}$${+}^{232}$Th and $^{237}\mathrm{Np}$, and $^{19}\mathrm{F}$${+}^{237}$Np have been measured. While the measured anisotropies in B- and C-induced fission are found to be in agreement with the predictions of the standard Halpern-Strutinsky theory, they are anomalously large in the case of O- and F-induced fission. Such a discontinuous behavior in angular anisotropy with respect to the entrance-channel mass-to-charge asymmetry provides an experimental verification of the predictions of the preequilibrium fission model proposed earlier to explain the anomalous fragment angular distributions.
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