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Nuclear Physics Seminars at BNL

Nucleon clustering at freezeout, far from and close to the QCD critical point

by Shuryak Edward


Clustering of nucleons at freezeout has been studied by a number of theoretical tools, including semiclassical (fluctons), hyperharmonics and, lately, direct Path Intergal Monte Carlo. It was found to be effective starting from four nucleons, with ``preclusters" feeding into multiple bound states decaying into channels with light nuclei $d,t,He^3$ and affecting proton distribution (kurtosis).   It was further found that even a minor increase of the range of nuclear forces  increases clustering dramatically. Furthermore, if there exists the QCD critical point (CP) with large correlation length $\xi$, attraction due to binary forces becomes unrealistically  large. The resolution of this paradox was found to be
due to repulsive many-body forces near CP,  overcoming the binary attraction and effectively suppressing clustering. We briefly discuss current experimental data and point out locations hinting at certain drop in clustering.

Organized by

Jiangyong Jia