Wide-range energy measurements have been carried out with an encapsulated 36-fold segmented germanium detector of AGATA (Advanced GAmma-ray Tracking Array). An unprecedented equivalent energy range of 5 keV to 180 MeV, or similar to 90 dB, has been obtained using a single acquisition chain, while maintaining a high energy resolution in the whole spectrum. For energies larger than 3 MeV the pulse-height is obtained with a Time-over-Threshold (ToT) technique. The measured resolution in all the tested range from 3 to 50 MeV is of <0.4%. The ToT technique has been demonstrated using a Am-241 + Be source with Ni target generating high-energy gamma photons by neutron capture reactions. A remarkable resolution of 0.21% has been obtained on the Ni spectrum line at the energy of 8.998 MeV.

A Time-over-Threshold technique for wide dynamic range gamma-ray spectroscopy with the AGATA detector / F. Zocca, A. Pullia, D. Bazzacco, G. Pascovici. - In: IEEE TRANSACTIONS ON NUCLEAR SCIENCE. - ISSN 0018-9499. - 56:4(2009 Aug), pp. 5204578.2384-5204578.2391.

A Time-over-Threshold technique for wide dynamic range gamma-ray spectroscopy with the AGATA detector

A. Pullia
Secondo
;
2009

Abstract

Wide-range energy measurements have been carried out with an encapsulated 36-fold segmented germanium detector of AGATA (Advanced GAmma-ray Tracking Array). An unprecedented equivalent energy range of 5 keV to 180 MeV, or similar to 90 dB, has been obtained using a single acquisition chain, while maintaining a high energy resolution in the whole spectrum. For energies larger than 3 MeV the pulse-height is obtained with a Time-over-Threshold (ToT) technique. The measured resolution in all the tested range from 3 to 50 MeV is of <0.4%. The ToT technique has been demonstrated using a Am-241 + Be source with Ni target generating high-energy gamma photons by neutron capture reactions. A remarkable resolution of 0.21% has been obtained on the Ni spectrum line at the energy of 8.998 MeV.
Gamma-ray spectroscopy ; germanium detectors; low-noise charge preamplifiers ; wide dynamic range
Settore ING-INF/01 - Elettronica
Settore FIS/01 - Fisica Sperimentale
Settore FIS/04 - Fisica Nucleare e Subnucleare
ago-2009
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2434/152349
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