Pulse-shape discrimination of surface events in CdZnTe detectors for the COBRA experiment

M. Fritts; J. Tebrügge; J. Durst; J. Ebert; C. Gößling; T. Göpfert; D. Gehre; C. Hagner; N. Heidrich; M. Homann; T. Köttig; T. Neddermann; C. Oldorf; T. Quante; S. Rajek; O. Reinecke; O. Schulz; J. Timm; B. Wonsak; K. Zuber

doi:10.1016/j.nima.2014.02.038

Pulse-shape discrimination of surface events in CdZnTe detectors for the COBRA experiment

M. Fritts
, J. Tebrügge
, J. Durst
, J. Ebert
, C. Gößling
, T. Göpfert
, D. Gehre
, C. Hagner
, N. Heidrich
, M. Homann
, T. Köttig
, T. Neddermann
, C. Oldorf
, T. Quante
, S. Rajek
, O. Reinecke
, O. Schulz
, J. Timm
, B. Wonsak
, K. Zuber

Physics and Astronomy (Twin Cities)

Research output: Contribution to journal › Article › peer-review

12 Scopus citations

Abstract

Events near the cathode and anode surfaces of a coplanar grid CdZnTe detector are identifiable by means of the interaction depth information encoded in the signal amplitudes. However, the amplitudes cannot be used to identify events near the lateral surfaces. In this paper a method is described to identify lateral surface events by means of their pulse shapes. Such identification allows for discrimination of surface alpha particle interactions from more penetrating forms of radiation, which is particularly important for rare event searches. The effectiveness of the presented technique in suppressing backgrounds due to alpha contamination in the search for neutrinoless double beta decay with the COBRA experiment is demonstrated.

Original language	English (US)
Pages (from-to)	27-34
Number of pages	8
Journal	Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
Volume	749
DOIs	https://doi.org/10.1016/j.nima.2014.02.038
State	Published - Jun 11 2014

Bibliographical note

Funding Information:
The COBRA Experiment would like to thank the Istituto Nazionale di Fisica Nucleare for the use of their laboratory and infrastructure at the Laboratori Nazionali del Gran Sasso , as well as the Deutsche Forschungsgemeinschaft for their support.

Keywords

CZT
Coplanar grid
Double beta decay
Lateral surface event
Pulse shape
Semiconductor detector

Publisher link

10.1016/j.nima.2014.02.038

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Fritts, M., Tebrügge, J., Durst, J., Ebert, J., Gößling, C., Göpfert, T., Gehre, D., Hagner, C., Heidrich, N., Homann, M., Köttig, T., Neddermann, T., Oldorf, C., Quante, T., Rajek, S., Reinecke, O., Schulz, O., Timm, J., Wonsak, B., & Zuber, K. (2014). Pulse-shape discrimination of surface events in CdZnTe detectors for the COBRA experiment. Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 749, 27-34. https://doi.org/10.1016/j.nima.2014.02.038

Fritts, M, Tebrügge, J, Durst, J, Ebert, J, Gößling, C, Göpfert, T, Gehre, D, Hagner, C, Heidrich, N, Homann, M, Köttig, T, Neddermann, T, Oldorf, C, Quante, T, Rajek, S, Reinecke, O, Schulz, O, Timm, J, Wonsak, B & Zuber, K 2014, 'Pulse-shape discrimination of surface events in CdZnTe detectors for the COBRA experiment', Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, vol. 749, pp. 27-34. https://doi.org/10.1016/j.nima.2014.02.038

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title = "Pulse-shape discrimination of surface events in CdZnTe detectors for the COBRA experiment",

abstract = "Events near the cathode and anode surfaces of a coplanar grid CdZnTe detector are identifiable by means of the interaction depth information encoded in the signal amplitudes. However, the amplitudes cannot be used to identify events near the lateral surfaces. In this paper a method is described to identify lateral surface events by means of their pulse shapes. Such identification allows for discrimination of surface alpha particle interactions from more penetrating forms of radiation, which is particularly important for rare event searches. The effectiveness of the presented technique in suppressing backgrounds due to alpha contamination in the search for neutrinoless double beta decay with the COBRA experiment is demonstrated.",

keywords = "CZT, Coplanar grid, Double beta decay, Lateral surface event, Pulse shape, Semiconductor detector",

author = "M. Fritts and J. Tebr{\"u}gge and J. Durst and J. Ebert and C. G{\"o}{\ss}ling and T. G{\"o}pfert and D. Gehre and C. Hagner and N. Heidrich and M. Homann and T. K{\"o}ttig and T. Neddermann and C. Oldorf and T. Quante and S. Rajek and O. Reinecke and O. Schulz and J. Timm and B. Wonsak and K. Zuber",

note = "Funding Information: The COBRA Experiment would like to thank the Istituto Nazionale di Fisica Nucleare for the use of their laboratory and infrastructure at the Laboratori Nazionali del Gran Sasso , as well as the Deutsche Forschungsgemeinschaft for their support. ",

year = "2014",

month = jun,

day = "11",

doi = "10.1016/j.nima.2014.02.038",

language = "English (US)",

volume = "749",

pages = "27--34",

journal = "Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment",

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T1 - Pulse-shape discrimination of surface events in CdZnTe detectors for the COBRA experiment

AU - Fritts, M.

AU - Tebrügge, J.

AU - Durst, J.

AU - Ebert, J.

AU - Gößling, C.

AU - Göpfert, T.

AU - Gehre, D.

AU - Hagner, C.

AU - Heidrich, N.

AU - Homann, M.

AU - Köttig, T.

AU - Neddermann, T.

AU - Oldorf, C.

AU - Quante, T.

AU - Rajek, S.

AU - Reinecke, O.

AU - Schulz, O.

AU - Timm, J.

AU - Wonsak, B.

AU - Zuber, K.

N1 - Funding Information: The COBRA Experiment would like to thank the Istituto Nazionale di Fisica Nucleare for the use of their laboratory and infrastructure at the Laboratori Nazionali del Gran Sasso , as well as the Deutsche Forschungsgemeinschaft for their support.

PY - 2014/6/11

Y1 - 2014/6/11

N2 - Events near the cathode and anode surfaces of a coplanar grid CdZnTe detector are identifiable by means of the interaction depth information encoded in the signal amplitudes. However, the amplitudes cannot be used to identify events near the lateral surfaces. In this paper a method is described to identify lateral surface events by means of their pulse shapes. Such identification allows for discrimination of surface alpha particle interactions from more penetrating forms of radiation, which is particularly important for rare event searches. The effectiveness of the presented technique in suppressing backgrounds due to alpha contamination in the search for neutrinoless double beta decay with the COBRA experiment is demonstrated.

AB - Events near the cathode and anode surfaces of a coplanar grid CdZnTe detector are identifiable by means of the interaction depth information encoded in the signal amplitudes. However, the amplitudes cannot be used to identify events near the lateral surfaces. In this paper a method is described to identify lateral surface events by means of their pulse shapes. Such identification allows for discrimination of surface alpha particle interactions from more penetrating forms of radiation, which is particularly important for rare event searches. The effectiveness of the presented technique in suppressing backgrounds due to alpha contamination in the search for neutrinoless double beta decay with the COBRA experiment is demonstrated.

KW - CZT

KW - Coplanar grid

KW - Double beta decay

KW - Lateral surface event

KW - Pulse shape

KW - Semiconductor detector

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U2 - 10.1016/j.nima.2014.02.038

DO - 10.1016/j.nima.2014.02.038

M3 - Article

AN - SCOPUS:84896496716

SN - 0168-9002

VL - 749

SP - 27

EP - 34

JO - Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment

JF - Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment

ER -

Pulse-shape discrimination of surface events in CdZnTe detectors for the COBRA experiment

Abstract

Bibliographical note

Keywords

Publisher link

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