Background recognition in Ge detectors by pulse shape analysis

Petry, F.; Piepke, A.; Strecker, H.; Klapdor‐Kleingrothaus, H. V.; Balysh, A.; Belyaev, S. T.; Demehin, A.; Gurov, A.A.; Kondratenko, I.P.; Kotelnikov, D. V.; Lebedev, V. I.; Landis, D.A.; Madden, N.; Pehl, Richard H.

doi:10.1016/0168-9002(93)90746-5

Cited by 25 publications

(9 citation statements)

References 6 publications

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“…Over time, all 0νββ searches have started to introduce multiple parameters to measure and reject backgrounds (see e.g. [55][56][57]). By including distance to surface and event type (SS/MS) parameters, EXO-200 was able to provide outstanding physics results in spite of a somewhat limited energy resolution.…”

Section: Sensitivity Variation Studiesmentioning

confidence: 99%

Sensitivity and discovery potential of the proposed nEXO experiment to neutrinoless double- β decay

Albert¹,

Anton²,

Arnquist³

et al. 2018

Phys. Rev. C

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199

196

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Section: Sensitivity Variation Studiesmentioning

confidence: 99%

Sensitivity and discovery potential of the proposed nEXO experiment to neutrinoless double- β decay

Albert¹,

Anton²,

Arnquist³

et al. 2018

Phys. Rev. C

Self Cite

199

196

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“…It is known from past experiments that the time dependence of the detector current pulse can be used to identify background events [3][4][5][6][7][8]. Signal events from 0νββ decays deposit energy within a small volume if the electrons lose little energy by bremsstrahlung (single site event, SSE).…”

Section: Introductionmentioning

confidence: 99%

Pulse shape discrimination for Gerda Phase I data

et al. 2013

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The GERDA experiment located at the Laboratori Nazionali del Gran Sasso of INFN searches for neutrinoless double beta (0νββ) decay of 76 Ge using germanium diodes as source and detector. In Phase I of the experiment eight semi-coaxial and five BEGe type detectors have been deployed. The latter type is used in this field of research for the first time. All detectors are made from material with enriched 76 Ge fraction. The experimental sensitivity can be improved by analyzing the pulse shape of the detector signals with the aim to reject background events. This Page 2 of 17 Eur. Phys. J. C (2013) 73:2583 paper documents the algorithms developed before the data of Phase I were unblinded. The double escape peak (DEP) and Compton edge events of 2.615 MeV γ rays from 208 Tl decays as well as two-neutrino double beta (2νββ) decays of 76 Ge are used as proxies for 0νββ decay.For BEGe detectors the chosen selection is based on a single pulse shape parameter. It accepts 0.92 ± 0.02 of signal-like events while about 80 % of the background events at Q ββ = 2039 keV are rejected.For semi-coaxial detectors three analyses are developed. The one based on an artificial neural network is used for the search of 0νββ decay. It retains 90 % of DEP events and rejects about half of the events around Q ββ . The 2νββ events have an efficiency of 0.85±0.02 and the one for 0νββ decays is estimated to be 0.90 +0.05 −0.09 . A second analysis uses a likelihood approach trained on Compton edge events. The third approach uses two pulse shape parameters. The latter two methods confirm the classification of the neural network since about 90 % of the data events rejected by the neural network are also removed by both of them. In general, the selection efficiency extracted from DEP events agrees well with those determined from Compton edge events or from 2νββ decays.

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“…One way of creating a pulse shape library for the bulk of the detector is based on the Compton effect [23][24][25][26][27][28]. A common approach [24,[26][27][28] is to irradiate the detector under test with gammas from a collimated 137 Cs source.…”

Section: Introductionmentioning

confidence: 99%

A novel wide-angle Compton Scanner setup to study bulk events in germanium detectors

Abt¹,

Gooch²,

Hagemann³

et al. 2022

Preprint

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A novel Compton Scanner setup has been built, commissioned and operated at the Max-Planck-Institute for Physics in Munich to study pulse shapes from bulk events in high-purity germanium detectors. In this fully automated setup, the detector under test is irradiated from the top with 661.660 keV gammas, some of which Compton scatter inside the detector. The interaction points in the detector can be reconstructed when the scattered gammas are detected with a pixelated camera placed at the side of the detector. This allows for the creation of position-dependent pulse shape libraries. The wide range of accepted Compton angles results in shorter measurement times in comparison to similar setups where only perpendicularly scattered gammas are selected by slit collimators. In this paper, the construction of the Compton Scanner, its alignment and the procedure to reconstruct interaction points in the germanium detector are described in detail. The creation of a first pulse shape library for an n-type segmented point-contact germanium detector is described. Selected pulses are compared to simulated pulses to demonstrate the power of such pulse shape libraries to better understand the charge carrier drift in germanium.

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Background recognition in Ge detectors by pulse shape analysis

Cited by 25 publications

References 6 publications

Sensitivity and discovery potential of the proposed nEXO experiment to neutrinoless double- β decay

Sensitivity and discovery potential of the proposed nEXO experiment to neutrinoless double- β decay

Pulse shape discrimination for Gerda Phase I data

A novel wide-angle Compton Scanner setup to study bulk events in germanium detectors

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