Understanding the anomalous fragment anisotropies in heavyion induced fission in the dynamical trajectory model |
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Authors: | R K Choudhury A Saxena K Kumar |
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Institution: | 1. Nuclear Physics Division, Bhabha Atomic Research Centre, Bombay, 400 085, India
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Abstract: | Dynamical trajectory model has been used to calculate the fusion and non-fusion trajectories in 10 B, 12 C, 16 O, 19 F +232 Th, 237 Np reactions. It is seen that in some of the above systems, there exists an l-window (above fusion l-value) for which the trajectories are characterised by large mass exchange and energy relaxation (fission-like) before the system undergoes symmetric split, without formation of a shape equilibrated compound nucleus. These events would correspond to a small value of the variance of the K-distribution, thereby leading to large fragment angular anisotropies. The fission fragment angular distributions, calculated as an admixture of these two classes of events (fusion and non-fusion), are able to explain the anomalous angular anisotropies observed experimentally for some systems at the above barrier energies. |
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