Leader: Ahmadov Gadir

Work phone number: +7 (496) 216-36-83

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Scientific problem:

Nuclear fission is one of the most complex processes in nuclear physics. Although scission has been well studied, rare fission modes such as ternary and quaternary fission provide deeper insight into the dynamics at the splitting point and the internal behavior of the fissile nucleus. In ternary fission, the nucleus decays into two heavy fragments and a light charged particle (LCP). Although this process has been studied, most previous experiments focused on heavier LCPs like alpha particles. Lighter LCPs—protons, deuterons and tritons are less studied due to limitations in detector sensitivity  and experimental design choices. Quaternary fission, in which the nucleus decays into four fragments, typically two heavy and two light, is even less studied and presents a more complex scission scenario. Current position-sensitive ∆E-E telescopes and silicon detectors allow for precise measurements of a wide range of LCPs with high angular and energy resolution. These systems enable direct observation of isotopes like ⁷Li and ⁸Be, in both ground and excited states. Studying these processes in spontaneous and thermal neutron-induced fission can help to refine the current fission prototypes and to improve our understanding of nuclear structure at the scission.

Objective: 

To investigate rare nuclear fission modes, specifically ternary and quaternary fission in sponteous and neutron-induced fission by measuring angular and energy distributions. Using pixel detector allow to identify psevdo ternary particles just directly measure angle between them. 

Tasks:

1. Literature review of ternary and quaternary fission mechanisms and experimental techniques.
2. Carrying out simulation-based identification of charged particles using specific energy loss (dE) and total energy (E) measurements.
3. Learning operation concepts of semiconductor pixel detectors (Timepix) and conventional silicon detectors.
4. Implementing energy calibration of the detectors.
5. Participation in measurements using position-sensitive ∆E–E semiconductor telescopes to measure and analyze angular and energy distributions of light charged particles (LCPs) in ternary and quaternary fission.
6. Identifying the emission of ⁷Li and ⁸Be isotopes in both ground and excited states.
7. Preparation and submission of results for publication and reports.

Research facilities: 

The paper will be completed under the project “Investigations of neutron nuclear interactions and properties of the neutron”  at the IREN facility of FLNP JINR and in the Institute of Nuclear Physics (Kazakhstan).