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In this proceedings, the lifetime and yields of  Λ  3 H and  Λ  4 H in Au+Au collisions at √ S   NN   = 3 GeV are presented. The measured yields are compared to measurements at other energies and theoretical models, and the physics implications are discussed. We also report the first observation of the  Λ  3 H and  Λ  4 H directed flow in 5 - 40% centrality. The directed flow of  Λ  3 H and  Λ  4 H are compared with those of the copiously produced particles such as p, Λ, d, t,  3 He, and  4 He. These results shed light on light hyper-nuclei production in heavy-ion collisions in the high baryon density region.

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Λ3H and Λ4H Lifetime, Yield, Directed Flow Measurements in Au+Au Collisions at √SNN = 3 GeV With the STAR Detector