A New kind of radiation-detector dead-time

Hales, B. P.; Nakamura, Shoji  ; Kimura, Atsushi   ; Iwamoto, Osamu  

It is necessary to account for detector and data acquisition system dead-time in time-dependent radiation detection experiments. Until now, the paralyzable and non-paralyzable models, in which an event occurring in the detector causes the detector to be unable to detect another event for a short period of time. (That is to say, deadtime occurs after an event). However, during a time-of-flight experiment with the new DAQ system for the Ge detector at J-PARC/MLF/ANNRI, we have found a phenomenon which is entirely unexplainable by these models. In this talk, we will discuss this new type of dead-time, its causes, and how to correct for it.