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Improved energy resolution of highly segmented HPGe detectors by noise reduction

  • Special Article - Tools for Experiment and Theory
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Abstract

Built-in redundancies in highly segmented high-purity Ge detectors are exploited to increase the energy resolution of these semiconductor devices for detection of electromagnetic radiation in the X-ray and γ-ray regime. The information of the two electronically decoupled independent measurements, the cathode and the anode electrodes, provides an improved signal-to-noise ratio through a combination of the individually measured signals performed on an event-by-event basis. The average energy resolution values of the AGATA triple cluster detector for an energy deposition of 60keV was measured to be 1.1 keV (FWHM) for the 36 segments and 1.2 keV for the core. The averaged signals of the core and the segments show an improved resolution value of 0.87 keV which is close to the expected theoretical limit. At higher γ-ray energy the averaging technique allows for an enhanced energy resolution with a FWHM of 2.15keV at 1.3MeV. By means of the position sensitive operation of AGATA a new value for the Fano factor was determined and the noise contributions to the FWHM of a γ-ray peak separated.

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Author notes

  1. A. Wiens

    Present address: Nuclear Science Division, Lawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, CA, 94720, USA

  2. B. Bruyneel

    Present address: CEA Saclay - IRFU, 91191, Gif-sur-Yvette, France

Authors and Affiliations

  1. Institut für Kernpyhsik, Zülpicherstr. 77, 50937, Köln, Germany

    A. Wiens, B. Birkenbach, B. Bruyneel, J. Eberth, H. Hess, Gh. Pascovici & P. Reiter

  2. INFN, Sezione di Padova, I-35122, Padova, Italy

    D. Bazzacco, E. Farnea, C. Michelagnoli & F. Recchia

Authors
  1. A. Wiens
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  2. B. Birkenbach
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  3. B. Bruyneel
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  4. J. Eberth
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  5. H. Hess
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  6. Gh. Pascovici
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  7. P. Reiter
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  8. D. Bazzacco
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  9. E. Farnea
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  10. C. Michelagnoli
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  11. F. Recchia
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for the AGATA Collaboration

Corresponding author

Correspondence to P. Reiter.

Additional information

Communicated by D. Pierroutsakou

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for the AGATA Collaboration., Wiens, A., Birkenbach, B. et al. Improved energy resolution of highly segmented HPGe detectors by noise reduction. Eur. Phys. J. A 49, 47 (2013). https://doi.org/10.1140/epja/i2013-13047-2

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  • DOI: https://doi.org/10.1140/epja/i2013-13047-2

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