Fig. 5

Spectral distributions of neutrons escaped from different layers of ANES for the GF \(\gamma\)-ray beam with \(\lambda =1550\) nm, together with the cross-section curve of the \(^{235}\)U(n,f) reaction. The thicknesses of the LBE and Be layers used in the Geant4 simulations are \(T_{\textrm{LBE}}=2\) cm and \(T_{\textrm{Be}}=16\) cm, respectively.