The νGeN experiment is aimed at studying antineutrino properties with a power reactor. The experimental setup is located at the Kalinin Nuclear Power Plant beneath Unit 3, which allows operating a ...huge antineutrino flux of (3.6–4.4) × 10
13
particles/(cm
2
s) that exceeds the solar neutrino flux on Earth almost by three orders of magnitude. A large amount of structural materials of the reactor corresponding to 50 m of water equivalent provides a good shielding from cosmic radiation. The signals of interest are detected with a specially designed low-background low-threshold germanium detector surrounded by combined active and passive shielding from radiation. The comparison between the data obtained with the reactor shut down (OFF) and in operation (ON) did not reveal any substantial differences in the detector background level. On the basis of the primary data, the sensitivity of the experiment to the search for coherent elastic neutrino nucleus scattering was evaluated.
Background coming from the Formula omittedAr decay chain is considered to be one of the most relevant for the Gerda experiment, which searches for the neutrinoless double beta decay of Formula ...omittedGe. The sensitivity strongly relies on the absence of background around the Q-value of the decay. Background coming from Formula omittedK, a progeny of Formula omittedAr, can contribute to that background via electrons from the continuous spectrum with an endpoint at 3.5 MeV. Research and development on the suppression methods targeting this source of background were performed at the low-background test facility LArGe . It was demonstrated that by reducing Formula omittedK ion collection on the surfaces of the broad energy germanium detectors in combination with pulse shape discrimination techniques and an argon scintillation veto, it is possible to suppress Formula omittedK background by three orders of magnitude. This is sufficient for Phase II of the Gerda experiment.
Celotno besedilo
Dostopno za:
DOBA, IZUM, KILJ, NUK, PILJ, PNG, SAZU, SIK, UILJ, UKNU, UL, UM, UPUK
Results from a prototype TES detector for the Ricochet experiment Augier, C.; Baulieu, G.; Belov, V. ...
Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment,
12/2023, Letnik:
1057
Journal Article
Recenzirano
Odprti dostop
Coherent elastic neutrino-nucleus scattering (CEνNS) offers valuable sensitivity to physics beyond the Standard Model. The Ricochet experiment will use cryogenic solid-state detectors to perform a ...precision measurement of the CEνNS spectrum induced by the high neutrino flux from the Institut Laue-Langevin nuclear reactor. The experiment will employ an array of detectors, each with a mass of ∼30 g and a targeted energy threshold of 50 eV. Nine of these detectors (the “Q-Array”) will be based on a novel Transition-Edge Sensor (TES) readout style, in which the TES devices are thermally coupled to the absorber using a gold wire bond. We present initial characterization of a Q-Array-style detector using a 1 gram silicon absorber, obtaining a baseline root-mean-square resolution of less than 40 eV.
Abstract
Novel NaIL detector (5 × 6 inch) was investigated for
its neutron detection in wide energy range. It has been found that
the detector together with its known ability to detect the
...γ-radiation it also allows to distinguish neutron signals in
three quasi-independent ways. It is sensitive to neutron fluxes on a
level down to 10
-3
cm
-2
s
-1
. In this work intrinsic
α-background and neutron detection sensitivity for the NaIL
detector were obtained. Experimental data was compared with results
of Geant4 Monte Carlo (MC).
Background coming from the 42Ar decay chain is considered to be one of the most relevant for the Gerda experiment, which searches for the neutrinoless double beta decay of 76Ge. The sensitivity ...strongly relies on the absence of background around the Q-value of the decay. Background coming from 42K, a progeny of 42Ar, can contribute to that background via electrons from the continuous spectrum with an endpoint at 3.5 MeV. Research and development on the suppression methods targeting this source of background were performed at the low-background test facility LArGe . It was demonstrated that by reducing 42K ion collection on the surfaces of the broad energy germanium detectors in combination with pulse shape discrimination techniques and an argon scintillation veto, it is possible to suppress 42K background by three orders of magnitude. This is sufficient for Phase II of the Gerda experiment.
Celotno besedilo
Dostopno za:
DOBA, IZUM, KILJ, NUK, PILJ, PNG, SAZU, SIK, UILJ, UKNU, UL, UM, UPUK
The EDELWEISS-II Collaboration has performed a direct search for WIMP dark matter with an array of ten 400 g heat-and-ionization cryogenic detectors equipped with interleaved electrodes for the ...rejection of near-surface events. Six months of continuous operation at the Laboratoire Souterrain de Modane have been achieved. The observation of one nuclear recoil candidate above 20 keV in an effective exposure of 144 kg d is interpreted in terms of limits on the cross-section of spin-independent interactions of WIMPs and nucleons. A cross-section of 1.0×10−7 pb is excluded at 90% CL for a WIMP mass of 80 GeV/c2. This result demonstrates for the first time the very high background rejection capabilities of these simple and robust detectors in an actual WIMP search experiment.
Low background experiments place stringent constraints on amount of radioactive impurities in the materials used for their assembly. Often these are in conflict with the constraints placed on the ...materials by their roles in the experiment. This is especially true for certain electronic components. A high value, high voltage capacitor for use in low background experiments has been developed from specially selected radiopure materials. Electroformed copper foils are separated by polyethylene napthalate (PEN) foils and supported within a PTFE teflon spiral coil tube. The electrical performance as well as radiopurity are scrutinized here. With some minor modifications to tune the performance for the application, this capacitor can be well suited for a variety of applications in low background experiments. Here the use of the capacitor for high voltage (HV) decoupling in the operation of high purity germanium (HPGe) detectors is demonstrated.
Celotno besedilo
Dostopno za:
DOBA, IZUM, KILJ, NUK, PILJ, PNG, SAZU, SIK, UILJ, UKNU, UL, UM, UPUK
HEROICA (Hades Experimental Research Of Intrinsic Crystal Appliances) is an infrastructure to characterize germanium detectors and has been designed and constructed at the HADES Underground Research ...Laboratory, located in Mol (Belgium). Thanks to the 223 m overburden of clay and sand, the muon flux is lowered by four orders of magnitude. This natural shield minimizes the exposure of radio-pure germanium material to cosmic radiation resulting in a significant suppression of cosmogenic activation in the germanium detectors. The project has been strongly motivated by a special production of germanium detectors for the GERDA experiment. GERDA, currently collecting data at the Laboratori Nazionali del Gran Sasso of INFN, is searching for the neutrinoless double beta decay of super(76)Ge. In the near future, GERDA will increase its mass and sensitivity by adding new Broad Energy Germanium (BEGe) detectors. The production of the BEGe detectors is done at Canberra in Olen (Belgium), located about 30 km from the underground test site. Therefore, HADES is used both for storage of the crystals over night, during diode production, and for the characterization measurements. A full quality control chain has been setup and tested on the first seven prototype detectors delivered by the manufacturer at the beginning of 2012. The screening capabilities demonstrate that the installed setup fulfills a fast and complete set of measurements on the diodes and it can be seen as a general test facility for the fast screening of high purity germanium detectors. The results are of major importance for a future massive production and characterization chain of germanium diodes foreseen for a possible next generation 1-tonne double beta decay experiment with super(76)Ge.
The GERDA experiment searches for the neutrinoless double beta (Ov beta beta ) decay of super(76)Ge using high-purity germanium detectors made of material enriched in super(76)Ge. For Phase II of the ...experiment a sensitivity for the half life T super(0) sub(1) super(v) sub(/2) similar to 2.10 super(26) yr is envisioned. Modified Broad Energy Germanium detectors (BEGe) with thick n super(+) electrodes provide the capability to efficiently identify and reject background events, while keeping a large acceptance for the Ov beta beta -decay signal through novel pulse-shape discrimination (PSD) techniques. The viability of producing thick-window BEGe-type detectors for the Gerda experiment is demonstrated by testing all the production steps from the procurement of isotopically modified germanium up to working BEGe detectors. Comprehensive testing of the spectroscopic as well as PSD performance of the Gerda Phase II prototype BEGe detectors proved that the properties of these detectors are identical to those produced previously from natural germanium material following the standard production line of the manufacturer. Furthermore, the production of BEGe detectors from a limited amount of isotopically modified germanium served to optimize the production, in order to maximize the overall detector mass yield. The results of this test campaign provided direct input for the subsequent production of the enriched germanium detectors.
Muon-induced neutrons constitute a prominent background component in a number of low count rate experiments, namely direct searches for dark matter. In this work we describe a neutron detector to ...measure this background in an underground laboratory, the Laboratoire Souterrain de Modane. The system is based on 1
m
3 of Gd-loaded scintillator and it is linked with the muon veto of the EDELWEISS-II experiment for coincident muon detection. The system was installed in autumn 2008 and passed since then a number of commissioning tests proving its full functionality. The data-taking is continuously ongoing and a count rate of the order of 1 muon-induced neutron per day has been achieved.
PDF
