Measurement of Neutron Inelastic Scattering on 56Fe, 48Ti, and 52Cr at the CSNS Back-n

However, such measurements at white neutron sources are severely hampered by intense pulse pile-up, particularly in the fast neutron region. This work presents a comprehensive investigation of (n, n′ γ) reactions on 56Fe, 48Ti, and 52Cr at the CSNS Back-n beamline.

A key innovation was the deployment of a high-performance LaBr3(Ce) detector array coupled with an advanced pulse pile-up recovery algorithm, which successfully reconstructs individual events at extreme counting rates up to 10^7 s−1 and resolves pulses separated by as little as 10 ns. This capability eliminated the need for traditional, model-dependent efficiency corrections and enabled the extraction of clean γ-ray spectra across the entire neutron energy range.