Year: 2026
Type: preprint
Abstract: Femtoscopy is a powerful tool for exploring the dynamic emitting structure in heavy-ion collisions, while radioactive beam heavy-ion collisions enable the investigation of nuclear matter under extreme isospin conditions. Here, we successfully perform femtoscopy measurements using the S$π$RIT Time Projection Chamber (TPC). A dedicated correction scheme for track merging and splitting is proposed, which is well applicable to rectangular TPCs housed inside dipole magnets and effectively improves the reconstructed correlation functions at small relative momenta. Focusing on the proton-proton (p-p) correlation function in the 270 MeV/u $^{132}\text{Sn}+^{124}\text{Sn}$ system, we successfully apply the track merging and splitting correction; additionally, the TPC angular acceptance exhibits a negligible impact on the correlation function. A systematic uncertainty quantification framework is established. The experimental results of the p-p correlation function confirm the feasibility of the S$π$RIT TPC for femtoscopy measurements and provide technical support for high-precision femtoscopy studies using rectangular TPCs in radioactive beam heavy-ion collisions.
Source: arXiv (Cornell University)
Authors: Wang, Y. J., Tam, C. K., Xiao, Z. G., Lynch, W. G., Tsang, C. Y., Barney, J., Jhang, G., Estee, J., Tsang, M. B., Wang, R. S., Kaneko, M., Lee, J. W., Park, J., Chajęcki, Z., Verde, G., Isobe, T., Kurata-Nishimura, M., Murakami, T., Ahn, D. S., Atar, L., Aumann, T., Baba, H., Boretzky, K., Brzychczyk, J., Cerizza, G., Chiga, N., Fukuda, N., Gasparic, I., Hong, B., Horvat, A., Ieki, K., Inabe, N., Kim, Y. J., Kobayashi, T., Kondo, Y., Lasko, P., Lee, H. S., Leifels, Y., Łukasik, J., Manfredi, J., McIntosh, A. B., Morfouace, P., Nakamura, T., Nakatsuka, N., Nishimura, S., Otsu, H., Pawłowski, P., Pelczar, K., Rossi, D., Sakurai, H., Santamaria, C., Sato, H., Scheit, H., Shane, R., Shimizu, Y., Simon, H., Snoch, A., Sochocka, A., Sumikama, T., Suzuki, H., Suzuki, D., Takeda, H., Tangwancharoen, S., Toernqvist, H., Togano, Y., Yennello, S. J., Zhang, Y.
Institutions: Beihang University, Western Michigan University, Tsinghua University, National Superconducting Cyclotron Laboratory, Michigan State University, Soochow University, Kyoto University, RIKEN Nishina Center, Korea University, Istituto Nazionale di Fisica Nucleare, Sezione di Catania, GSI Helmholtz Centre for Heavy Ion Research, Technische Universität Darmstadt, Jagiellonian University, Rikkyo University, Institute for Basic Science, Tohoku University, Tokyo Institute of Technology, Institute of Nuclear Physics, Polish Academy of Sciences, Texas A&M University, National Institute for Subatomic Physics, Center of Excellence in Theoretical and Computational Science, King Mongkut's University of Technology Thonburi, Nanjing Normal University
Language: English
Subfield: Nuclear and High Energy Physics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: green
Funders: National Science Foundation, U.S. Department of Energy, National Research Foundation, Ministry of Education, Culture, Sports, Science and Technology, National Research Foundation of Korea, Tsinghua University, Hrvatska Zaklada za Znanost, Helmholtz International Center for FAIR, Japan Society for the Promotion of Science, RIKEN, Fundamental Research Funds for the Central Universities
Awards: G1883778784, G2227393196, G222768804, G2436857590, Cluster correlations in nuclear reactions and nuclear matter studied with transport models, Operation of the NSCL as a National User Facilty & Research Program, Comprehensive understanding of heavy-ion collision dynamics, pion production and Delta resonance in medium, NEW AWARD - "CYCLOTRON BASED NUCLEAR SCIENCE" PI - JOSEPH B.NATOWITZ, G3534744629, G3888850926, Diversity of nuclear matter properties in heavy-ion collisions and Equation of State of asymmetric nuclear matter, TEXAS A&M UNIVERSITY CYCLOTRON INSTITUTE RESEARCH PLAN, G5548152103, G5965505636, G7476386635, G8195599115, G8784777311
OpenAlex ID: W7171648993