2023/11/13 by Yijie Wang, Mengting Wan, Wang, Yijie +71 · 3 citations
Physics and Astronomy · #FOS: Physical sciences #High-Energy Particle Collisions Research #Nuclear Experiment (nucl-ex) #Nuclear Physics and Applications #Nuclear Theory (nucl-th) #Nuclear physics research studies
paper · pdf · doi:10.48550/arxiv.2311.07095
openalex publication_date 2023/11/13 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
The neutron rich neck zone created in heavy ion reaction is experimentally probed by the production of the A=3 isobars. The energy spectra and angular distributions of triton and 3He are measured with the CSHINE detector in 86Kr +208Pb reactions at 25 MeV/u. While the energy spectrum of 3He is harder than that of triton, known as "3He-puzzle", the yield ratio R(\rm t/3He) presents a robust rising trend with the polar angle in laboratory. Using the fission fragments to reconstruct the fission plane, the enhancement of out-plane R(\rm t/3He) is confirmed in comparison to the in-plane ratios. Transport model simulations reproduce qualitatively the experimental trends, but the quantitative agreement is not achieved. The results demonstrate that a neutron rich neck zone is formed in the reactions. Further studies are called for to understand the clustering and the isospin dynamics related to neck formation.