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Phenomenological Model for Predicting theEnergy Resolution of Neutron-Damaged Coaxial HPGe Detectors

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4 Author(s)
Van Siclen, C.D. ; Idaho Nat. Lab., Idaho Falls, ID, USA ; Seabury, E.H. ; Wharton, C.J. ; Caffrey, A.J.

The peak energy resolution of germanium detectors deteriorates with increasing neutron fluence. This is due to hole capture at neutron-created defects in the crystal which prevents the full energy of the gamma-ray from being recorded by the detector. A phenomenological model of coaxial HPGe detectors is developed that relies on a single, dimensionless parameter that is related to the probability for immediate trapping of a mobile hole in the damaged crystal. As this trap parameter is independent of detector dimensions and type, the model is useful for predicting energy resolution as a function of neutron fluence.

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Nuclear Science, IEEE Transactions on  (Volume:59 ,  Issue: 5 )