77 research outputs found
Surface characterization of p-type point contact germanium detectors
P-type point contact (PPC) germanium detectors are used in rare event and
low-background searches, including neutrinoless double beta (0vbb) decay,
low-energy nuclear recoils, and coherent elastic neutrino-nucleus scattering.
The detectors feature an excellent energy resolution, low detection thresholds
down to the sub-keV range, and enhanced background rejection capabilities.
However, due to their large passivated surface, separating the signal readout
contact from the bias voltage electrode, PPC detectors are susceptible to
surface effects such as charge build-up. A profound understanding of their
response to surface events is essential. In this work, the response of a PPC
detector to alpha and beta particles hitting the passivated surface was
investigated in a multi-purpose scanning test stand. It is shown that the
passivated surface can accumulate charges resulting in a radial-dependent
degradation of the observed event energy. In addition, it is demonstrated that
the pulse shapes of surface alpha events show characteristic features which can
be used to discriminate against these events
Investigation of ASIC-based signal readout electronics for LEGEND-1000
LEGEND, the Large Enriched Germanium Experiment for Neutrinoless
Decay, is a ton-scale experimental program to search for neutrinoless double
beta () decay in the isotope Ge with an unprecedented
sensitivity. Building on the success of the low-background Ge-based
GERDA and MAJORANA DEMONSTRATOR experiments, the LEGEND collaboration is
targeting a signal discovery sensitivity beyond yr on the decay
half-life with approximately of exposure. Signal
readout electronics in close proximity to the detectors plays a major role in
maximizing the experiment's discovery sensitivity by reducing electronic noise
and improving pulse shape analysis capabilities for the rejection of
backgrounds. However, the proximity also poses unique challenges for the
radiopurity of the electronics. Application-specific integrated circuit (ASIC)
technology allows the implementation of the entire charge sensitive amplifier
(CSA) into a single low-mass chip while improving the electronic noise and
reducing the power consumption. In this work, we investigated the properties
and electronic performance of a commercially available ASIC CSA, the XGLab CUBE
preamplifier, together with a p-type point contact high-purity germanium
detector. We show that low noise levels and excellent energy resolutions can be
obtained with this readout. Moreover, we demonstrate the viability of pulse
shape discrimination techniques for reducing background events.Comment: 18 pages, 12 figures, 3 table
Characterization measurements of the TRISTAN multi-pixel silicon drift detector
Sterile neutrinos are a minimal extension of the Standard Model of Particle Physics. A laboratory-based approach to search for this particle is via tritium beta-decay, where a sterile neutrino would cause a kink-like spectral distortion. The Karlsruhe Tritium Neutrino (KATRIN) experiment extended by a multi-pixel Silicon Drift Detector system has the potential to reach an unprecedented sensitivity to the keV-scale sterile neutrino in a lab-based experiment. The new detector system combines good spectroscopic performance with a high rate capability. In this work, we report about the characterization of charge-sharing between pixels and the commissioning of a 47-pixel prototype detector in a MAC-E filte
Characterization measurements of the TRISTAN multi-pixel silicon drift detector
Sterile neutrinos are a minimal extension of the standard model of particle physics. A laboratory-based approach to search for this particle is via tritium ÎČ-decay, where a sterile neutrino would cause a kink-like spectral distortion. The Karlsruhe Tritium Neutrino (KATRIN) experiment extended by a multi-pixel Silicon Drift Detector system has the potential to reach an unprecedented sensitivity to the keV-scale sterile neutrino in a lab-based experiment. The new detector system combines good spectroscopic performance with a high rate capability. In this work, we report about the characterization of charge-sharing between pixels and the commissioning of a 47-pixel prototype detector in a MAC-E filter
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Improved Upper Limit on the Neutrino Mass from a Direct Kinematic Method by KATRIN.
We report on the neutrino mass measurement result from the first four-week science run of the Karlsruhe Tritium Neutrino experiment KATRIN in spring 2019. Beta-decay electrons from a high-purity gaseous molecular tritium source are energy analyzed by a high-resolution MAC-E filter. A fit of the integrated electron spectrum over a narrow interval around the kinematic end point at 18.57 keV gives an effective neutrino mass square value of (-1.0_{-1.1}^{+0.9})ââeV^{2}. From this, we derive an upper limit of 1.1 eV (90% confidence level) on the absolute mass scale of neutrinos. This value coincides with the KATRIN sensitivity. It improves upon previous mass limits from kinematic measurements by almost a factor of 2 and provides model-independent input to cosmological studies of structure formation
Quantitative Long-Term Monitoring of the Circulating Gases in the KATRIN Experiment Using Raman Spectroscopy
The Karlsruhe Tritium Neutrino (KATRIN) experiment aims at measuring the effective electron neutrino mass with a sensitivity of 0.2 eV/c, i.e., improving on previous measurements by an order of magnitude. Neutrino mass data taking with KATRIN commenced in early 2019, and after only a few weeks of data recording, analysis of these data showed the success of KATRIN, improving on the known neutrino mass limit by a factor of about two. This success very much could be ascribed to the fact that most of the system components met, or even surpassed, the required specifications during long-term operation. Here, we report on the performance of the laser Raman (LARA) monitoring system which provides continuous high-precision information on the gas composition injected into the experimentâs windowless gaseous tritium source (WGTS), specifically on its isotopic purity of tritiumâone of the key parameters required in the derivation of the electron neutrino mass. The concentrations c for all six hydrogen isotopologues were monitored simultaneously, with a measurement precision for individual components of the order 10 or better throughout the complete KATRIN data taking campaigns to date. From these, the tritium purity, ΔT, is derived with precision of <10 and trueness of <3 Ă 10, being within and surpassing the actual requirements for KATRIN, respectively
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