2021

Kumar, D.; Kozulin, E. M.; Knyazheva, G. N.; Maiti, M.; Itkis, I. M.; Bogachev, A. A.; Novikov, K. V.; Cheralu, M.; Banerjee, T.; Diatlov, I. N.; Kozulina, N. I.; Pchelintsev, I. V.; Vorobiev, I. V.; Pan, A. N.; Prajapat, R.; Kumar, R.; Vardaci, E.; Trzaska, W. H.; Andreyev, A.; Harca, I. M.

The mass–energy distributions of binary fission fragments (FFs) of excited exotic nucleus 178Pt* were measured via the fusion reaction 36Ar + 142Nd at different beam energies within 158–222 MeV range using the double arm time-of-flight spectrometer CORSET. The analysis of mass–energy matrices reveals the presence of both asymmetric and symmetric modes corresponding to respective lower and higher total kinetic energy (TKE) of the fragments within 42–64 MeV excitation energy. The agreement of measured mass width with theoretical systematics and dominance of the associated symmetric TKE component at 93 MeV excitation energy indicates the significant predominance/suppression of symmetric/asymmetric mode, respectively. The most probable light and heavy mass peaks of asymmetric fission mode of 178Pt are spotted at 79 and 99 u, respectively. As inferred from the theory, the mass–TKE events observed at the highest measured excitation energy (93 MeV) endorse the presence of the fast-fission process in 178Pt* at high angular momentum.