Test of pulse shape analysis using single Compton scattering events

Abt, I.; Caldwell, A.; Kroeninger, K.; Liu, J.; Liu, X.; Majorovits, B.

doi:10.1140/epjc/s10052-008-0555-0

Cited by 7 publications

(6 citation statements)

References 11 publications

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“…Coincident Compton scattering measurements allowed to test the validity of our PSD calibration based on the DEP and Compton data via a comparison with single Compton scattering (SCS) events. Similar coincidence measurements for PSD validation have been carried out in the past [8,21]. The SCS data are dominated by SSE, but have a different topology than the DEP events (single electron absorption in SCS vs. an electron and a positron in DEP) and a different spatial event distribution inside the detector.…”

Section: Experimental Validation Of the Psd Methodsmentioning

confidence: 69%

Pulse shape discrimination studies with a Broad-Energy Germanium detector for signal identification and background suppression in the GERDA double beta decay experiment

et al. 2009

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First studies of event discrimination with a Broad-Energy Germanium (BEGe) detector are presented. A novel pulse shape method, exploiting the characteristic electrical field distribution inside BEGe detectors, allows to identify efficiently single-site events and to reject multi-site events. The first are typical for neutrinoless double beta decays (0νββ) and the latter for backgrounds from gamma-ray interactions. The obtained survival probabilities of backgrounds at energies close to Q ββ ( 76 Ge) = 2039 keV are (0.93 ± 0.08)% for events from 60 Co, (21 ± 3)% from 226 Ra and (40 ± 2)% from 228 Th. This background suppression is achieved with (89 ± 1)% acceptance of 228 Th double escape events, which are dominated by single site interactions. Approximately equal acceptance is expected for 0νββ-decay events. Collimated beam and Compton coincidence measurements demonstrate that the discrimination is largely independent of the interaction location inside the crystal and validate the pulse-shape cut in the energy range of Q ββ . The application of BEGe detectors in the GERDA and the Majorana double beta decay experiments is under study.

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Section: Experimental Validation Of the Psd Methodsmentioning

confidence: 69%

Pulse shape discrimination studies with a Broad-Energy Germanium detector for signal identification and background suppression in the GERDA double beta decay experiment

et al. 2009

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“…Both IGEX and HM experiments used a semi-coaxial detector design but an intense work to search for new germanium detector designs aiming at improving the background suppression compared to the semicoaxial type has been developed in cooperation with manufacturers. Many efforts were devoted to apply segmented detectors to DBD experiments, applying more sophisticated techniques of background rejection than in conventional germanium detectors [186,187,188,189,190,191,192,193,194,195,196]. Development of Broad Energy germanium (BEGe) detectors opened new possibilities for a further improvement of this kind of experiments [197,198].…”

Section: Semiconductor Double Beta Decay Experiments Worldwidementioning

confidence: 99%

Double beta decay experiments at Canfranc Underground Laboratory

Cebrián

2020

Progress in Particle and Nuclear Physics

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The first activities of the Canfranc Underground Laboratory ("Laboratorio Subterráneo de Canfanc", LSC) started in the mid-eighties in a railway tunnel located under the Spanish Pyrenees; since then, it has become an international multidisciplinary facility equipped with different services for underground science. The research activity at LSC is about Astroparticle Physics, dark matter searches and neutrino Physics; but also activities in Nuclear Astrophysics, Geophysics, and Biology are carried out. The investigation of the neutrinoless double beta decay has been one of the main research lines of LSC since the beginning. Many unknowns remain in the characterization of the basic neutrino properties and the study of this rare decay process requiring Physics beyond the Standard Model of Particle Physics can shed light on the lepton number conservation, the nature of the neutrinos as Dirac or Majorana particles and the absolute scale and ordering of the masses of the three generations. Here, the double beta decay searches performed at LSC for different emitters and following very different experimental approaches will be reviewed: from the very first experiments in the laboratory including the successful IGEX ("International Germanium EXperiment") for 76 Ge, which released very stringent limits to the effective neutrino mass at the time, to the present NEXT experiment ("Neutrino Experiment with a Xenon Time-Projection Chamber") for 136 Xe and future project CROSS ("Cryogenic Rare-event Observatory with Surface Sensitivity") for 130 Te and 100 Mo, both implementing innovative detector technologies to discriminate backgrounds. For the neutrinoless double beta decay channel and at 90% C.L., IGEX derived a limit to the half-life of 76 Ge of T 0ν 1/2 > 1.57 × 10 25 y while the corresponding expected limits are T 0ν 1/2 > 1.0 × 10 26 y for 136 Xe from NEXT-100 (for an exposure of 500 kg•y) and T 0ν 1/2 > 2.8×10 25 y for 100 Mo from CROSS (for 5 y and 4.7 kg of isotope). Activities related to double beta decays searches carried out in other underground laboratories have also been developed at LSC and will be presented too, like the operation of the BiPo-3 detector for radiopurity measurements of thin sheets with very high sensitivity. For each one of these experiments, the concept, the experimental setups and relevant results will be discussed.

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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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Test of pulse shape analysis using single Compton scattering events

Cited by 7 publications

References 11 publications

Pulse shape discrimination studies with a Broad-Energy Germanium detector for signal identification and background suppression in the GERDA double beta decay experiment

Pulse shape discrimination studies with a Broad-Energy Germanium detector for signal identification and background suppression in the GERDA double beta decay experiment

Double beta decay experiments at Canfranc Underground Laboratory

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

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