Track length measurement of F-19(+) ions with the MIMAC directional Dark Matter detector prototype

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68407700%3A90107%2F21%3A00357726" target="_blank" >RIV/68407700:90107/21:00357726 - isvavai.cz</a>

Result on the web

<a href="https://doi.org/10.1016/j.nima.2020.164569" target="_blank" >https://doi.org/10.1016/j.nima.2020.164569</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.nima.2020.164569" target="_blank" >10.1016/j.nima.2020.164569</a>

Result language

angličtina

Original language name

Track length measurement of F-19(+) ions with the MIMAC directional Dark Matter detector prototype

Original language description

Weakly Interacting Massive Particles (WIMPs) are one of the most preferred candidates for Dark Matter. WIMPs should interact with the nuclei of detectors. If a robust signal is eventually observed in direct detection experiments, the best signature to confirm its Galactic origin would be the angular distribution of nuclear recoil tracks (Spergel, 1988). The MIMAC collaboration has developed a low pressure gas detector providing both the kinetic energy and three-dimensional track reconstruction of nuclear recoils. In this paper we report the first ever observations of19F nuclei tracks in a 5 cm drift prototype MIMAC detector, in the low kinetic energy range (6-26 keV), using specially developed ion beam facilities. We have measured the recoil track lengths and found significant differences between our measurements and standard simulations. In order to understand these differences, we have performed a series of complementary experiments and simulations to study the impact of the diffusion and overall systematics. We show an unexpected dependence of the number of digitizer time bins corresponding to the track on the electric field applied to the 512 mu m gap of the Micromegas detector. We have introduced, based on the flash-ADC observable, corrections in order to reconstruct the physical 3D track length of the primary electron clouds before avalanches, proposing the physics behind these corrections. We show that diffusion and space charge effects need to be taken into account to explain the differences between measurements and standard simulations. These measurements and simulations may shed a new light on the high-gain TPC ionization signals in general and particularly at low energy.

Czech name

—

Czech description

—

Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

—

OECD FORD branch

10303 - Particles and field physics

Project

—

Continuities

—

Publication year

2021

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

Nuclear Instruments and Methods in Physics Research, Section A, Accelerators, Spectrometers, Detectors and Associated Equipment

ISSN

0168-9002

e-ISSN

1872-9576

Volume of the periodical

985

Issue of the periodical within the volume

164569

Country of publishing house

NL - THE KINGDOM OF THE NETHERLANDS

Number of pages

8

Pages from-to

1-8

UT code for WoS article

000592358000013

EID of the result in the Scopus database

—