Pulse Shape Analysis for Background Reduction in BEGe Detectors
Recent developments in pulse shape analysis (PSA) show that detectors with a small read-out contact can be used to discriminate between pulses generated when the deposited energy is located within a small region of about 1 mm3 from the pulses generated when the energy is deposited at different locations several mm or cm apart. Two possible applications using this technique are: i) experiments that look for neutrinoless double beta decay in 76Ge, such as GERDA ii) gamma spectrometry measurements where the Compton continuum can be reduced and the efficiency for cascading gamma-rays can remain high.
A commercial detector with similar characteristics as the one described by Barbeau et al. is the so-called BEGe produced by Canberra. A modified model of such type detector was successfully used by Budjás in the frame of the GERDA experiment.
This report presents the results obtained for two standard BEGe detectors, with 19% and 50% relative efficiency respectively, using the same technique for the pulse shape discrimination (PSD) as Budjás et al. This technique is rather simple; it is based on just one parameter obtained from one signal read out.
The aim of this study is to determine the influence of the detector size in the PSD as well as to study the capability of using this PSA to reduce the Compton continuum and thus improve the detection limits.
The results obtained show that it is possible to use this PSD technique with commercial BEGe detectors though the discrimination capability is not as good as for specially designed detectors. Two key questions were the electrode size and the electronic noise which have proved to have bigger influence in the PSD than the size of the crystal.
GONZALEZ DE ORDUNA Raquel;
HULT Mikael;
ANDREOTTI Erica;
MARISSENS Gerd;
BUDJAS D.;
MISIASZEK M.;
2010-10-13
Publications Office of the European Union
JRC60405
978-92-79-16701-0,
1018-5593,
EUR 24521 EN,
OP LA-NA-24521-EN-C,
https://publications.jrc.ec.europa.eu/repository/handle/JRC60405,
10.2787/28767,
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