Experimental fission study using multi-nucleon transfer reactions

  • Nishio K
  • Hirose K
  • Léguillon R
  • et al.
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© The Authors, published by EDP Sciences, 2017. It is shown that the multi-nucleon transfer reactions is a powerful tool to study fission of exotic neutron-rich actinide nuclei, which cannot be accessed by particle-capture or heavy-ion fusion reactions. In this work, multi-nucleon transfer channels of the reactions of 18O+232Th, 18O+238U and 18O+248Cm are used to study fission for various nuclei from many excited states. Identification of fissioning nuclei and of their excitation energy is performed on an event-by-event basis, through the measurement of outgoing ejectile particle in coincidence with fission fragments. Fission fragment mass distributions are measured for each transfer channel. Predominantly asymmetric fission is observed at low excitation energies for all studied cases, with a gradual increase of the symmetric mode towards higher excitation energy. The experimental distributions are found to be in general agreement with predictions of the fluctuation-dissipation model. Role of multi-chance fission in fission fragment mass distributions is discussed, where it is shown that mass-asymmetric structure remaining at high excitation energies originates from low-excited nuclei by evaporation of neutrons.




Nishio, K., Hirose, K., Léguillon, R., Makii, H., Orlandi, R., Tsukada, K., … Andreyev, A. (2017). Experimental fission study using multi-nucleon transfer reactions. EPJ Web of Conferences, 146, 04009. https://doi.org/10.1051/epjconf/201714604009

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