Fission fragment angular distributions at near-barrier energies in ¹¹B, ¹²C, ¹⁴N+ ²⁰⁹Bi

Abstract

Fission fragment angular distributions and fission excitation functions have been measured for ¹¹B, ¹²C, and ¹⁴N+₂₀₉Bi systems at near-barrier energies. The measured fission fragment anisotropies are in agreement with the predictions of the standard saddle point statistical model. For these systems, there is no evidence for any "anomalous" behavior of the anisotropies as a function of both energy and entrance channel mass asymmetry. The present results combined with the data available for ¹⁶O, ¹⁹F+²⁰⁸Pb, and ¹⁶O+²⁰⁹Bi systems and for deformed actinide targets systems are consistent with the conjecture that target deformation plays a strong role in the observed anomalous anisotropies in actinide targets.