Laser-driven neutron sources have potential applications in many fields of science and technology due to ultrahigh neutron flux and ultrashort pulse duration.We simulated the generation of photonuclear neutrons in the full-physical process by use of several numerical simulation codes.At first,we used 1Dradiation hydrodynamics code to simulate the process of ultraintense laser prepulse interacting with Cu target,acquiring the preplasma electrons density profile.Then we got hot electrons information by 3DPIC ...