Fission fragment angular distribution measurements for the ²⁸Si + ¹⁸⁰Hf reaction

In heavy ion reactions involving massive projectiles and targets the observed fission events is often seen as a mixture of two types of fission namely compound nucleus fission (CNF) and non compound nucleus fission (NCNF). Fast fission, quasi fission and pre-equilibrium fission are examples of NCNF. Experimental signatures of NCNF includes ER cross section suppression, increase in the width of fission fragment mass distribution (FFMD), anomalous fission fragment angular anisotropy, fission fragment mass angle co-relation etc. Disentangling the non-compound nucleus fission from CN fission is a difficult task as the experimental observables overlap significantly. Fission fragment angular distribution is usually explained using transition state models. Any deviation from the transition state model predictions is generally attributed to the onset of NCNF processes. Here we report the fission fragment angular distribution measurement of ²⁸Si + ⁸⁰Hf system