Mass- Asymmetric Breakup in the Extended Finite-RangeMacroscopic Model

Using the Cassinian ovaloid as fission shape both in symmetry and asymmetry, including Yukawa-plus-exponential finite range interaction and diffused surface, the rotating finite-range Cassinian ovaloid liquid drop model is developed. The dependence of the fission barrier heights on mass-asymmetry and on angular momentum is studied for the compound nuclei ¹¹²1n, ¹⁵⁹Tb and ²⁰⁹Bi. The predicted asymmetric fission barriers and mass yields are compared with experimental data obtained from the deexcitation of hot composite nuclei by complex fragment emission.