Abstract
The transverse momentum spectra of triton with STAR Beam Energy Scan data from Au+Au collisions at sNN=7.7,11.5,14.5,19.6,27,39,62.4,200GeV in the centrality classes 0 – 10%, 10 – 20%, 20 – 40% and 40 – 80% are reported. The centrality dependence of the coalescence parameter B3 of triton and the collision energy dependence of the relative neutron density fluctuation are then calculated. The results indicate that the B3 decreases from peripheral to central collisions and the neutron density fluctuation shows a non-monotonic collision energy dependence with a peak around collision energy of 20-30 GeV. In addition, we report details about the reconstruction method of HΛ3 via HΛ3→3He+π− and HΛ3→d+p+π− using high statistics data in Au+Au collisions at sNN=200GeV collected in 2014 and 2016 with the Heavy Flavor Tracker.