中法核工程与技术学院核声论坛（总第186期）

ABSTRACT：

One of the key research directions of our group is the study of exotic neutron-rich systems and neutron clustering phenomena. A series of experiments was conducted at the ACCULINNA-2 facility using a high-intensity ⁸He beam and a deuterium target to investigate the structure and decay of ⁶H, ⁷H, and the possible existence of a tetraneutron (⁴n). These experiments provided new evidence for the ground and excited states of ⁷H, revealing a five-body decay pattern. In parallel, the ⁶H system was studied via the ⁸He+d → ⁴He+⁶H channel, where a resonant state was identified at 6.8 MeV, with an indication of a possible ground state at 4.5 MeV. Momentum distributions of the decay products also showed strong dineutron-type correlations in the decay of ⁵H. Furthermore, two independent transfer reactions enabled the reconstruction of the missing-mass spectrum of the tetraneutron system, revealing a broad structure around 3.5 MeV above the decay threshold. These findings are consistent with recent international results and provide valuable insight into the nature of few-body nuclear systems.

My contribution involved detector calibration, development of data acquisition and simulation tools, and optimization of experimental geometry and analysis techniques within the ExpertRoot framework. The results demonstrate the effectiveness of using ultra-thin silicon detectors and simulation-based design to enhance sensitivity to rare multi-neutron decay modes.

ABOUT THE SPEAKER：

Muzalevskii Ivan is a scientific researcher in ACCULINNA group of FLNR JINR. He possess a large variety of technical knowledge, practical skills and experience, experimental data analysis, mathematical statistics, simulation of experiments, developing software for data analysis automatization, handling with semiconductor and scintillator detectors. Ph.D. degree in University in Opava, Czech republic. He has 9 years experience of working in international collaborations (NUSTAR at FAIR), advanced skills of public presentations, article publishing and intercultural communication.