Fission dynamics is a complex and intriguing field where factors such as mass distribution (MD), neutron multiplicity \((v_{M})\) , and multi-chance fission (MCF) play crucial roles. At low excitation energies (up to 40 MeV approx.), shell effects are prominent, but these effects diminish at higher energies. However, asymmetric mass distribution (AMD) may still occur, a phenomenon explained by the MCF concept. Recent studies have provided insights into MCF and its impact on fission dynamics. This study investigates the mass distribution of heavy ions such as 228U, 237U, and 238U, with particular emphasis on the first chance fission (FCF) of the daughter nuclei of 238U at \(\text {E}^*_{\text {CN}} = 46\) MeV. The role of FCF events in the daughter nuclei is highlighted, showing how neutron emissions reduce the effective excitation energy \((E^*_{\text {eff}})\) . This study presents a two-dimensional spectrum of fission Mass-TKE, illustrating both projectile-like and target-like particles, along with fission events. For the first two isotopes, an asymmetric pattern is observed, reflecting distinct fission characteristics. However, for the CN 228U, no asymmetric pattern is seen, indicating a symmetric fission distribution at higher energies. We analyze the progression from symmetric to asymmetric first-chance fission fragment mass distributions (FFMD) and observe that asymmetry is driven by dominant FCF events in 235U and 234U at lower \(E^*_{\text {eff}}\) for the system 238U. Additionally, multi-chance fission (MCF) for these systems is explored with a focus on pre-neutron multiplicity \((v_{\text {pre}})\) as a function of excitation energy and neutron mass across various energy levels. The results suggest that incorporating MCF provides a new perspective on fission dynamics, deepening our understanding of the intricate processes governing nuclear fission. Our findings show that asymmetric FFMD arises primarily from MCF, which is governed by the FCF of the daughter nuclei. However, for higher mass systems, even at lower \(\text {E}^*_{\text {CN}}\) , both symmetric and asymmetric distributions are also observed. The dynamics of this, in our view, are closely linked to excitation energy and neutron emission, as the latter reduces the \(E^*_{\text {eff}}\) . This study builds on the understanding of nuclear fission by emphasizing the importance of MCF and \(v_{M}\) , offering insights into the transition from symmetric to asymmetric fission dynamics in heavy ion systems. These systematics highlight the role of excitation energy and MCF in shaping the fission observables and advancing our comprehension of nuclear reaction dynamics.
