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We report on the measurement of the neutron radiation hardness of siliconphotomultipliers (SiPMs) manufactured by Hamamatsu Corporation in Japan andSensL in Ireland. Samples from both companies were irradiated by neutronscreated by a 1 GeV electron beam hitting a thin lead target at Jefferson LabHall A. More tests regarding the temperature dependence of the neutronradiation damage and self-annealing were performed on Hamamatsu SiPMs using acalibrated Am-Be neutron source from the Jefferson Lab Radiation Control group.As the result of irradiation both dark current and dark rate increase linearlyas a function of the 1 MeV equivalent neutron fluence and a temperaturedependent self-annealing effect is observed.

Radiation Hardness Tests of SiPMs for the JLab Hall D Barrel Calorimeter