Entrance-channel effect in fission fragment anisotropies from<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msup><mml:mrow/><mml:mrow><mml:mn>11</mml:mn></mml:mrow></mml:msup></mml:mrow><mml:mi mathvariant="normal">B</mml:mi><mml:mrow><mml:msup><mml:mrow><mml:mo>+</mml:mo></mml:mrow><mml:mrow><mml:mn>235</mml:mn></mml:mrow></mml:msup></mml:mrow><mml:mi mathvariant="normal">U</mml:mi></mml:math>and<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msup><mml:mrow/><mml:mrow><mml:mn>14</mml:mn></mml:mrow></mml:msup></mml:mrow><mml:mi mathvariant="normal">N</mml:mi><mml:mrow><mml:msup><mml:mrow><mml:mo>+</mml:mo></mml:mrow><mml:mrow><mml:mn>232</mml:mn></mml:mrow></mml:msup></mml:mrow><mml:mi mathvariant="normal">Th</mml:mi></mml:math>systems

Fission fragment angular distributions have been measured for ${}^{11}\mathrm{B}\mathrm{}{+}^{235}\mathrm{U}$ and ${}^{14}\mathrm{N}\mathrm{}{+}^{232}\mathrm{Th},$ both leading to the same compound nucleus ${}^{246}\mathrm{Bk}$ and lying on either side of the Businaro-Gallone critical asymmetry parameter. At comparable excitation energies, even though $〈{l}^{2}〉$ of the compound nucleus for ${}^{14}\mathrm{N}\mathrm{}{+}^{232}\mathrm{Th}$ are smaller than that of ${}^{11}\mathrm{B}\mathrm{}{+}^{235}\mathrm{U},$ the anisotropies measured for the former are found to be significantly larger than that from the latter. Further, while the measured anisotropies in the case of ${}^{11}\mathrm{B}\mathrm{}{+}^{235}\mathrm{U}$ are found to be consistent with the statistical saddle-point model, the corresponding data for ${}^{14}\mathrm{N}{+}^{232}\mathrm{Th}$ are found to be ``anomalous'' indicating the presence of entrance channel dependent noncompound nuclear contributions.