Latest results from the NEWS-G dark matter experiment

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68407700%3A90263%2F24%3A00381667" target="_blank" >RIV/68407700:90263/24:00381667 - isvavai.cz</a>

Výsledek na webu

<a href="https://doi.org/10.22323/1.441.0042" target="_blank" >https://doi.org/10.22323/1.441.0042</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.22323/1.441.0042" target="_blank" >10.22323/1.441.0042</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Latest results from the NEWS-G dark matter experiment

Popis výsledku v původním jazyce

In the Fall of 2019, the NEWS-G experiment used its latest detector, a 140 cm diameter Spherical Proportional Counter (SPC) to search for low-mass dark matter at the Laboratoire souterrain de Modane (LSM) in France. The detector has then been moved to SNOLAB in Canada and has taken data since the Fall of 2022. SPCs are metallic spheres filled with gas, with a high-voltage anode at the centre that attracts and amplifies ionization charges from atomic recoils. Having the sphere filled with pure methane, hydrogen was used as the target to produce new limits on the proton spin-dependent cross-section around masses of 1 GeV. This paper first introduces the NEWS-G experiment and describes the commissioning at the LSM with the shielding used, the SPC detection principle and the new multi-anode sensor. It then focuses on the calibrations using a UV laser and 37Ar, as well as the background discrimination methods to remove α-particle induced events and spurious pulses. Then, it presents the profile likelihood ratio method that was used to derive constraints on WIMP mass and cross-section. Finally, it describes the status of the recent data taken at SNOLAB and mentions future projects.

Název v anglickém jazyce

Latest results from the NEWS-G dark matter experiment

Popis výsledku anglicky

In the Fall of 2019, the NEWS-G experiment used its latest detector, a 140 cm diameter Spherical Proportional Counter (SPC) to search for low-mass dark matter at the Laboratoire souterrain de Modane (LSM) in France. The detector has then been moved to SNOLAB in Canada and has taken data since the Fall of 2022. SPCs are metallic spheres filled with gas, with a high-voltage anode at the centre that attracts and amplifies ionization charges from atomic recoils. Having the sphere filled with pure methane, hydrogen was used as the target to produce new limits on the proton spin-dependent cross-section around masses of 1 GeV. This paper first introduces the NEWS-G experiment and describes the commissioning at the LSM with the shielding used, the SPC detection principle and the new multi-anode sensor. It then focuses on the calibrations using a UV laser and 37Ar, as well as the background discrimination methods to remove α-particle induced events and spurious pulses. Then, it presents the profile likelihood ratio method that was used to derive constraints on WIMP mass and cross-section. Finally, it describes the status of the recent data taken at SNOLAB and mentions future projects.

Druh

D - Stať ve sborníku

CEP obor

—

OECD FORD obor

10304 - Nuclear physics

Projekt

—

Návaznosti

—

Rok uplatnění

2024

Kód důvěrnosti údajů

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

Název statě ve sborníku

Proc. XVIII International Conference on Topics in Astroparticle and Underground Physics

ISBN

—

ISSN

1824-8039

e-ISSN

1824-8039

Počet stran výsledku

5

Strana od-do

1-5

Název nakladatele

Sissa Medialab Srl

Místo vydání

Trieste

Místo konání akce

Vienna

Datum konání akce

28. 8. 2023

Typ akce podle státní příslušnosti

WRD - Celosvětová akce

Kód UT WoS článku

001327036000023