68 research outputs found
Technique d'éradication d'Aphelenchoides besseyi (Nematoda : Aphelenchina) dans les semences de Panicum maximum
Mise au point d'une méthode d'éradication d'Aphelenchoides besseyi (Nematoda : Aphelenchoidea) dans les graines de Panicum maximum
Comportement des partenaires et répartition des éléments chimiques dans les greffes de tomates
Un système de sépultures collectives au Néolithique final à Val-de-Reuil et Portejoie
Identifiant de l'opération archéologique : Date de l'opération : 1993 - 1998 (PC) Inventeur(s) : Billard Cyrille (SRA) ; Guillon Mark ; Sunder Frédérique ; Verron Guy La fouille exhaustive de plusieurs dizaines d'hectares dans les carrières de granulats de la Boucle du Vaudreuil a révélé un ensemble de cinq sépultures collectives rapprochées, de type « allées sépulcrales » et situées sur l'emprise d'une carrière exploitée par la Compagnie des Sablières de la Seine. Les travaux de fouille de ..
Characterization of the phonon sensor of the CRYOSEL detector with IR photons
The sensitivities of light Dark Matter (DM) particle searches with cryogenic
detectors are mostly limited by large backgrounds of events that do not produce
ionization signal. The CRYOSEL project develops a new technique where this
background in a germanium cryogenic detector is rejected by using the signals
from a Superconducting Single Electron Device (SSED) sensor designed to detect
the phonons emitted through the Neganov-Trofimov-Luke effect by the eh
pairs as they drift in a close-by very high-field region. A tag on signals from
this device should suppress the heat-only background. The measurement of the
response to IR laser pulses of the first CRYOSEL prototype show the relevance
of such sensor technology.Comment: 9 pages, 3 figures, LTD2
Tagging and localisation of ionizing events using NbSi transition edge phonon sensors for Dark Matter searches
In the context of direct searches of sub-GeV Dark Matter particles with
germanium detectors, the EDELWEISS collaboration has tested a new technique to
tag ionizing events using NbSi transition edge athermal phonon sensors. The
emission of the athermal phonons generated by the Neganov-Trofimov-Luke effect
associated with the drift of electrons and holes through the detectors is used
to tag ionization events generated in specific parts of the detector localized
in front of the NbSi sensor and to reject by more than a factor 5 (at 90% C.L.)
the background from heat-only events that dominates the spectrum above 3 keV.
This method is able to improve by a factor 2.8 the previous limit on
spin-independent interactions of 1 GeV/c2 WIMPs obtained with the same detector
and data set but without this tagging technique.Comment: 13 pages, 11 figure
MeCP2 and MBD2 expression in human neoplastic and non-neoplastic breast tissue and its association with oestrogen receptor status
First demonstration of 30 eVee ionization energy resolution with Ricochet germanium cryogenic bolometers
The future Ricochet experiment aims to search for new physics in the
electroweak sector by measuring the Coherent Elastic Neutrino-Nucleus
Scattering process from reactor antineutrinos with high precision down to the
sub-100 eV nuclear recoil energy range. While the Ricochet collaboration is
currently building the experimental setup at the reactor site, it is also
finalizing the cryogenic detector arrays that will be integrated into the
cryostat at the Institut Laue Langevin in early 2024. In this paper, we report
on recent progress from the Ge cryogenic detector technology, called the
CryoCube. More specifically, we present the first demonstration of a 30~eVee
(electron equivalent) baseline ionization resolution (RMS) achieved with an
early design of the detector assembly and its dedicated High Electron Mobility
Transistor (HEMT) based front-end electronics. This represents an order of
magnitude improvement over the best ionization resolutions obtained on similar
heat-and-ionization germanium cryogenic detectors from the EDELWEISS and
SuperCDMS dark matter experiments, and a factor of three improvement compared
to the first fully-cryogenic HEMT-based preamplifier coupled to a CDMS-II
germanium detector. Additionally, we discuss the implications of these results
in the context of the future Ricochet experiment and its expected background
mitigation performance.Comment: 10 pages, 5 figures, 1 tabl
Fast neutron background characterization of the future Ricochet experiment at the ILL research nuclear reactor
The future Ricochet experiment aims at searching for new physics in the
electroweak sector by providing a high precision measurement of the Coherent
Elastic Neutrino-Nucleus Scattering (CENNS) process down to the sub-100 eV
nuclear recoil energy range. The experiment will deploy a kg-scale
low-energy-threshold detector array combining Ge and Zn target crystals 8.8
meters away from the 58 MW research nuclear reactor core of the Institut Laue
Langevin (ILL) in Grenoble, France. Currently, the Ricochet collaboration is
characterizing the backgrounds at its future experimental site in order to
optimize the experiment's shielding design. The most threatening background
component, which cannot be actively rejected by particle identification,
consists of keV-scale neutron-induced nuclear recoils. These initial fast
neutrons are generated by the reactor core and surrounding experiments
(reactogenics), and by the cosmic rays producing primary neutrons and
muon-induced neutrons in the surrounding materials. In this paper, we present
the Ricochet neutron background characterization using He proportional
counters which exhibit a high sensitivity to thermal, epithermal and fast
neutrons. We compare these measurements to the Ricochet Geant4 simulations to
validate our reactogenic and cosmogenic neutron background estimations.
Eventually, we present our estimated neutron background for the future Ricochet
experiment and the resulting CENNS detection significance.Comment: 14 pages, 14 figures, 1 tabl
Coherent elastic neutrino-nucleus scattering: Terrestrial and astrophysical applications
Coherent elastic neutrino-nucleus scattering (CENS) is a process in which neutrinos scatter on a nucleus which acts as a single particle. Though the total cross section is large by neutrino standards, CENS has long proven difficult to detect, since the deposited energy into the nucleus is keV. In 2017, the COHERENT collaboration announced the detection of CENS using a stopped-pion source with CsI detectors, followed up the detection of CENS using an Ar target. The detection of CENS has spawned a flurry of activities in high-energy physics, inspiring new constraints on beyond the Standard Model (BSM) physics, and new experimental methods. The CENS process has important implications for not only high-energy physics, but also astrophysics, nuclear physics, and beyond. This whitepaper discusses the scientific importance of CENS, highlighting how present experiments such as COHERENT are informing theory, and also how future experiments will provide a wealth of information across the aforementioned fields of physics
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