https://doi.org/10.1140/epjc/s10052-024-12433-1
Regular Article - Experimental Physics
First demonstration of 30 eVee ionization energy resolution with Ricochet germanium cryogenic bolometers
1
Univ Lyon, Université Lyon 1, CNRS/IN2P3, IP2I-Lyon, 69622, Villeurbanne, France
2
Department of Nuclear Spectroscopy and Radiochemistry, Laboratory of Nuclear Problems, JINR, 141980, Dubna, Moscow Region, Russia
3
Université Paris-Saclay, CNRS/IN2P3, IJCLab, 91405, Orsay, France
4
Univ. Grenoble Alpes, CNRS, Grenoble INP, Institut Néel, 38000, Grenoble, France
5
Univ. Grenoble Alpes, CNRS, Grenoble INP, LPSC-IN2P3, 38000, Grenoble, France
6
Department of Physics, University of Massachusetts at Amherst, 01003, Amherst, MA, USA
7
Department of Physics and Astronomy, Northwestern University, Evanston, IL, USA
8
Department of Physics, University of Toronto, M5S 1A7, Toronto, ON, Canada
9
Laboratory for Nuclear Science, Massachusetts Institute of Technology, 02139, Cambridge, MA, USA
10
Institut Laue Langevin, 38042, Grenoble, France
11
Université Paris-Saclay, CNRS, C2N, 91120, Palaiseau, France
12
Present address: CEA, Gif-sur-Yvette, France
13
LPI RAS, Moscow, Russia
14
Univ Lyon, Université Lyon 1, CNRS/IN2P3, IP2I-Lyon, 69622, Villeurbanne, France
a
j.billard@ipnl.in2p3.fr
g
j.billard@ipnl.in2p3.fr
Received:
6
June
2023
Accepted:
11
January
2024
Published online:
24
February
2024
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 with a total input capacitance of about 40 pF. This represents an order of magnitude improvement over the best ionization resolutions obtained on similar phonon-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 with a total input capacitance of 250 pF. Additionally, we discuss the implications of these results in the context of the future Ricochet experiment and its expected background mitigation performance.
© The Author(s) 2024
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