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Pulse shape discrimination with pure CsI scintillators is investigated as amethod for separating energy deposits by energetic neutrons and photons atparticle physics experiments. Using neutron data collected near the EuropeanXFEL XS1 beam window the pulse shape discrimination capabilities of pure CsIare studied and compared to CsI(Tl) using near-identical detector setups, whichwere operated in parallel. The inelastic interactions of 100MeV neutrons areobserved to produce a slower scintillation emission in pure CsI relative toenergy deposits from cosmic muons. By employing a charge-ratio method for pulseshape characterization, pulse shape discrimination with pure CsI is shown to beeffective for identifying energy deposits from neutrons vs. cosmic muons,however, pure CsI was not able resolve the specific type of neutron inelasticinteractions as can be done with CsI(Tl). Using pulse shape discrimination, therate of energetic neutron interactions in a pure CsI detector is measured as afunction of time and shown to be correlated with the European XFEL beam power.The results demonstrate that pulse shape discrimination with pure CsI hassignificant potential to improve electromagnetic vs. hadronic showeridentification at future particle physics experiments.

Energetic neutron identification with pulse shape discrimination in pure CsI crystals