Measurements of the ionization efficiency of protons in methane
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68407700%3A90107%2F22%3A00386594" target="_blank" >RIV/68407700:90107/22:00386594 - isvavai.cz</a>
Result on the web
<a href="https://doi.org/10.1140/epjc/s10052-022-11063-9" target="_blank" >https://doi.org/10.1140/epjc/s10052-022-11063-9</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1140/epjc/s10052-022-11063-9" target="_blank" >10.1140/epjc/s10052-022-11063-9</a>
Alternative languages
Result language
angličtina
Original language name
Measurements of the ionization efficiency of protons in methane
Original language description
The amount of energy released by a nuclear recoil ionizing the atoms of the active volume of detection appears "quenched" compared to an electron of the same kinetic energy. This different behavior in ionization between electrons and nuclei is described by the Ionization Quenching Factor (IQF) and it plays a crucial role in direct dark matter searches. For low kinetic energies (below 50 keV), IQF measurements deviate significantly from common models used for theoretical predictions and simulations. We report measurements of the IQF for proton, an appropriate target for searches of Dark Matter candidates with a mass of approximately 1 GeV, with kinetic energies in between 2 keV and 13 keV in 100 mbar of methane. We used the Comimac facility in order to produce the motion of nuclei and electrons of controlled kinetic energy in the active volume, and a NEWS-G SPC to measure the deposited energy. The Comimac electrons are used as a reference to calibrate the detector with 7 energy points. A detailed study of systematic effects led to the final results well fitted by IQF (E-K) = E-K(alpha) / (beta + E-K(alpha)) with alpha = 0.70 +/- 0.08 and beta = 1.32 +/- 0.17. In agreement with some previous works in other gas mixtures, we measured less ionization energy than predicted from SRIM simulations, the difference reaching 33% at 2 keV.
Czech name
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Czech description
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Classification
Type
J<sub>SC</sub> - Article in a specialist periodical, which is included in the SCOPUS database
CEP classification
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OECD FORD branch
10304 - Nuclear physics
Result continuities
Project
—
Continuities
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Others
Publication year
2022
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
European Physical Journal C
ISSN
1434-6044
e-ISSN
1434-6052
Volume of the periodical
82
Issue of the periodical within the volume
12
Country of publishing house
DE - GERMANY
Number of pages
10
Pages from-to
1-10
UT code for WoS article
000896642000002
EID of the result in the Scopus database
2-s2.0-85143827782