Pulse shape analysis of liquid scintillators for neutron studies

The acquisition of signals from liquid scintillators with Flash ADC of high sampling rate ð 1G S=sÞ has been investigated. The possibility to record the signal waveform is of great advantage in studies with g’s and neutrons in a high count-rate environment, as it allows to easily identify and separate pile-up events. The shapes of pulses produced by g-rays and neutrons have been studied for two different liquid scintillators, NE213 and C6D6: A 1-parameter fitting procedure is proposed, which allows to extract information on the particle type and energy. The performance of this method in terms of energy resolution and n=g discrimination is analyzed, together with the capability to identify and resolve pile-up events. r 2002 Elsevier Science B.V. All rights reserved.

[1]  A. Bertin,et al.  Performance of a coincidence neutron spectrometer with double pulse-shape discrimination , 1994 .

[2]  T. Okuda,et al.  Performance of n–γ pulse-shape discrimination with simple pile-up rejection at high γ-ray count rates , 1999 .

[3]  J. Kasagi,et al.  Particle identification via pulse-shape discrimination with a charge-integrating ADC , 1988 .

[4]  H. Spieler,et al.  A simple pulse-shape discrimination circuit , 1974 .

[5]  R. Nardo,et al.  A full-integrated pulse-shape discriminator for liquid scintillator counters 1 1 The work reported h , 1998 .

[6]  J. H. Gibbons,et al.  Capture-Cross-Section Studies for 30—220-keV Neutrons Using a New Technique , 1967 .

[7]  J. Kasagi,et al.  Use of charge integrating ADCs with pulse shape discriminators for neutron-gamma discrimination , 1985 .

[8]  L. Fiore,et al.  A modular array for neutron spectroscopy in low- and intermediate-energy heavy-ion reactions , 1996 .

[9]  Alain Ninane,et al.  Detection Efficiency of the Neutron Modular Detector Demon and Related Characteristics , 1995 .

[10]  M. Moszynski,et al.  Comparison of n-γ discrimination by zero-crossing and digital charge comparison methods , 1995 .

[11]  G. Knoll.  Radiation detection and measurement , 1979 .

[12]  S. Ogawa,et al.  NEUTRON-GAMMA DISCRIMINATION EMPLOYING PATTERN RECOGNITION OF THE SIGNAL FROM LIQUID SCINTILLATOR , 1999 .

[13]  J. M. Adams,et al.  A versatile pulse shape discriminator for charged particle separation and its application to fast neutron time-of-flight spectroscopy , 1978 .

[14]  Y. Blumenfeld,et al.  EDEN - A NEUTRON TIME-OF-FLIGHT MULTIDETECTOR FOR DECAY STUDIES OF GIANT STATES , 1993 .