Morjean, M.Hinde, DavidSimenel, CedricJeung, DongyunAiriau, MCook, KaitlinDasgupta, MahanandaDrouart, A.Jacquet, DDevi (Kalkal), SunilPalshetkar, ChandaniPrasad, EdayillamRafferty, DominicSimpson, EdwardTassan-Got, LVo-Phuoc, KirstenWilliams, Elizabeth2020-01-242020-01-240031-9007http://hdl.handle.net/1885/199776The atomic numbers and the masses of fragments formed in quasifission reactions are simultaneously measured at scission in Ti48+U238 reactions at a laboratory energy of 286 MeV. The atomic numbers are determined from measured characteristic fluorescence x rays, whereas the masses are obtained from the emission angles and times of flight of the two emerging fragments. For the first time, thanks to this full identification of the quasifission fragments on a broad angular range, the important role of the proton shell closure at Z=82 is evidenced by the associated maximum production yield, a maximum predicted by time-dependent Hartree-Fock calculations. This new experimental approach gives now access to precise studies of the time dependence of the N/Z (neutron over proton ratios of the fragments) evolution in quasifission reactions.The authors acknowledge support from the Australian Research Council through Discovery Grants No. FL110100098, No. FT120100760, No. DP130101569, No. DE140100784, No. DP160 101254, and No. DP170102318. Support for accelerator operations through the NCRIS program is acknowledged. Two of us (C. S. and M. A.) acknowledge support from the Scientific Mobility Program of the Embassy of France in Australia. This research was undertaken with the assistance of resources from the National Computational Infrastructure (NCI), which is supported by the Australian Government.application/pdfen-AU© 2017 American Physical Society201710.1103/PhysRevLett.119.2225022022-08-21