2025-06-03 中国科学院（CAS）
Left: Hyperon elliptic flow versus transverse momentum in hypernucleus-nucleus collisions. Right: Rapidity distributions of light hypertriton production in carbon-carbon collisions. (Image by IMP)
＜関連情報＞
- https://english.cas.cn/newsroom/research_news/phys/202506/t20250604_1044977.shtml
- https://journals.aps.org/prc/abstract/10.1103/PhysRevC.111.054617
- https://www.sciencedirect.com/science/article/pii/S0370269325003107?via%3Dihub
C+C反応における3ΛH生成による高密度および低密度でのΛポテンシャルのプローブ Probing Λ potential at high and low densities via 3ΛH production in C+C reactions
Gao-Chan Yong, J. L. Rodríguez-Sánchez, and Yapeng Zhang
Physical Review C Published: 15 May, 2025
DOI: https://doi.org/10.1103/PhysRevC.111.054617
Abstract
The production of Λ hyperons and light hypernuclei in heavy-ion collisions provides critical insights into the nuclear equation of state (EoS) and hyperon interactions in dense matter, addressing the longstanding “hyperon puzzle” in neutron star physics. Using the INCL+ABLA and AMPT-HC models, we systematically investigate C+C collisions at beam energies of 1.1 and 1.9 GeV/nucleon to explore the sensitivity of hyperon and hypernuclei yields to the EoS and hyperon potential. Our results reveal that Λ hyperon production is predominantly influenced by the nuclear EoS, while light hypernuclei formation (e.g., 3ΛH) exhibits stronger sensitivity to the hyperon potential at high/low densities with the incident beam energies of 1.1/1.9 GeV. The study provides a framework for future experiments at facilities like HIAF and FAIR/GSI to resolve the hyperon puzzle, thus advancing our understanding of quantum chromodynamics in high-density regimes.
ハイパー核反応におけるv2フローによるΛポテンシャルのプローブ Probing Λ potential via its v2 flow in hypernuclei-induced reaction
Gao-Chan Yong
Physics Letters B Available online: 9 May 2025
DOI:https://doi.org/10.1016/j.physletb.2025.139549
Abstract
The hyperon potential, particularly its behavior at high densities, is crucial for resolving the “hyperon puzzle” in neutron stars and for advancing our understanding of the strong interactions between strange and non-strange particles in high baryon density environments. Using the hadronic transport model AMPT-HC, hypernucleus-nucleus collision is studied. It is found that at beam energies below the threshold for hyperon production, the hyperon elliptic flow exhibits noticeable asymmetry between the positive and negative rapidity regions and is sensitive to the strength of the hyperon potential, especially in the large negative rapidity region. One can extract the hyperon potential approximately twice the saturation density based on the hyperon elliptic flow in the negative rapidity region, and the hyperon potential around the saturation density based on the hyperon elliptic flow in the positive rapidity region.
