Speaker
Description
D. V. Kamanin1, Yu. V. Pyatkov2,1, A. N. Solodov1, P. Z. Ngcobo3, V. E. Zhuchko1, T. H. Vilane 1,4, Z. I. Goryainova1, O. V. Strekalovsky3, E. A. Kuznetsova1, A.O. Zhukova1, Yu. M. Sereda 1, B.A. Le 1
1 Joint Institute for Nuclear Research, Dubna, Russia;
2 National Nuclear Research University “MEPHI”, Moscow, Russia;
3 University of Zululand, Republic of South Africa
4North-West University, Republic of South Africa
The report is dedicated to summarizing the experimental activities of the FOBOS group (FLNR, JINR, Dubna, Russia) at the MT-25 microtron [1, 2]. A series of experiments dedicated to the study of (ɣ, f) reactions using 235U, 238U, 232Th, and 242Pu targets were performed. It was shown for the first time that some fraction of the fission fragments (FFs) is born in the shape isomer states with a life-time exceeding 400ns. Such fragments can undergo a break-up while passing through a solid-state foil, and at least one of the break-up products shows magic nucleon composition. Recently an emission of the light charged particles (LCP) from the fission fragments (FFs) in the direction opposite to the FF velocity vector has been observed. The LCP yield is estimated to be approximately 10-3/bin. fiss., which is three orders of magnitude higher than that observed earlier. We attribute the enhanced yield to the Coulomb-induced break-up of the deformed fragments in the solid target, indicating a previously unresolved ternary fission channel. Previous theoretical model of the break-up process is discussed.
References
1. Yu.V. Pyatkov et al., Proc. 27th Int. Seminar on Interaction of Neutrons with Nuclei (ISINN-27), Dubna, Russia, 2019.
2. D.V. Kamanin et al., Phys. Part. Nucl. Lett. 22, 272 (2025)
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