Study of fission using multi-nucleon transfer reactions

• Main Authors: Nishio Katsuhisa, Hirose Kentaro, Mark Vermeulen, Makii Hiroyuki, Orlandi Riccardo, Tsukada Kazuaki, Asai Masato, Toyoshima Atsushi, Sato Tetsuya K., Nagame Yuichiro, Chiba Satoshi, Aritomo Yoshihiro, Tanaka Shouya, Ohtsuki Tsutomu, Tsekhanovich Igor, Petrache Costel M., Andreyev Andrei
• Format: Article
• Language: English
• Published: EDP Sciences 2017-01-01
• Series: EPJ Web of Conferences
• Online Access: https://doi.org/10.1051/epjconf/201716300041

It is shown that multi-nucleon transfer reaction is a powerful tool to study fission of exotic neutronrich 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, 18O+248Cm, and 18O+237Np were used to measure fission-fragment mass distribution for each transfer channel. Predominantly asymmetric fission is observed at low excitation energies for all the studied cases, with an increase of the symmetric fission towards high excitation energies. Experimental data are compared with predictions of the fluctuation-dissipation model, where effects of multi-chance fission (neutron evaporation prior to fission) was introduced. It is shown that mass-asymmetric structure remaining at high excitation energies originates from low-excited and less neutronrich excited nuclei due to higher-order chance fissions.