Estimation of Impact Parameter on event-by-event basis in Nuclear Emulsion Detector

摘要

Photographic Nuclear Emulsion Detector (PNED) has been in use in nuclear andparticle physics experiments from the begining, often as the major detectorsystem. However, direct measurement of impact parameter in this detector doesnot seem possible due to some limitations. This paper discribe a simple yetstrong method to estimate the impact parameter of events on event-by-eventbasis. Though this method is develpoed specifically for the photographicnuclear emulsion detector, we envision that it should also be applicable toother multi-target detector systems.