Evidence for the Role of Proton Shell Closure in Quasifission Reactions from X-Ray Fluorescence of Mass-Identified Fragments

M. Morjean, D. J. Hinde, C. Simenel, D. Y. Jeung, M. Airiau, K. J. Cook, M. Dasgupta, A. Drouart, D. Jacquet, S. Kalkal, C. S. Palshetkar, E. Prasad, D. Rafferty, E. C. Simpson, L. Tassan-Got, K. Vo-Phuoc, E. Williams

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    24 Citations (Scopus)

    Abstract

    The 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.

    Original languageEnglish
    Article number222502
    JournalPhysical Review Letters
    Volume119
    Issue number22
    DOIs
    Publication statusPublished - 28 Nov 2017

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