The application of pulse shape analysis to in-beam EXOGAM data

The performance of Pulse Shape Analysis (PSA) techniques when applied to EXOGAM has been assessed using data collected in-beam at GANIL (Grand Accelerateur National d’Ions Lourds). Gamma rays from the decay of 94 , 95 Mo were incident upon two EXOGAM clovers and the resulting charge pulses were digitised. Risetime and Image Charge Asymmetry (ICA) techniques have been applied to the data to increase the granularity of the detectors beyond the electrical segmentation of the outer contact. Before PSA the position resolution in the plane of the detector front face is 14.5 mm FWHM. Close to segment boundaries, where the magnitude of induced charge pulses is changing quickly with position, this can be improved to around 10 mm. Further from segment boundaries little improvement is seen due to the magnitude of pulses induced in neighbouring segments being less than that of the detector baseline noise.