Argon Isotope Background Dark Matter
A tonne scale liquid argon time projection chamber for dark matter searches ardm collaboration dec 19 2016. Jcap 1703 2017 no 03 003 backgrounds and pulse shape discrimination in the ardm liquid argon tpc ardm collaboration dec 2 2017.
Pin On Constellations
In a dark matter experiment employing a liquid argon detector such particles would collide with argon nuclei causing them to recoil.
Argon isotope background dark matter. The ardm experiment operates a ton scale. Several large dark matter detectors based on liquid argon have been proposed including deap miniclean warp and dark side. In this concentration gradient the heavier isotopes accumulate at the bottom end of the column and the lighter isotopes at the top.
This so called dark matter dm is hunted among others with the argon dark matter experiment ardm. The depleted argon can then be used as a target material for next generation large scale dark matter detectors. Atmospheric argon contains the 39ar isotope β.
Argon is a noble gas and makes up just 1 of the atmosphere. Thermal diffusion exploits an established temperature gradient to produce a concentration gradient along the length of a vertical column. These nuclear recoils produce ionised and excited argon atoms which after a series of reactions form short lived argon dimers weakly bonded molecules that decay and emit scintillation light.
Predicting no background in 2 6 y of a run with argon depleted in the radioactive isotope 39 ar. The projected sensitivity using the measured psd performance an energy threshold of 35 kev n r and a data taking period of 3 years is 1 0 45 cm 2 for a 100 gev wimp. Exotic then but a situation the canadian brand hopes to change at least in the gravel world with the dark matter.
Liquid argon is a promising detection medium for wimp dark matter but the sensitivity of argon detectors is compromised by the presence of the beta emitting isotope 39ar formed in atmospheric argon by cosmic ray interactions. But exotic is also a good description for the hydraulic rotor 1 13 groupset fitted to this bike. Ardm is a liquid argon double phase time projection chamber tpc with calorimetric capabilities.
We have built. The overall objective is a reduction of 39ar content by a factor of more than 15 000 with a high throughput which will enable a low background search for the mysterious dark matter known to account for most of the matter in the universe but not yet directly observed. It offers large target masses exceptional purity efficient scintillation and pulse shape discrimination psd.
This increases the effective costs of argon for large dark matter detectors. Ardm aims at a direct detection of the nuclear recoil from a collision of a hypothetical dm particle with an argon nucleus. But g2 detectors with active mass much greater than a ton are essential to detect or rule out wimp dark matter in the theoretically favored cross section range.
Liquid argon is an excellent medium for dark matter detection. Vpsa plant as build in the kinder morgan co2 facility. Darkside collaborators have sought and found a way to extend the reach of lar tpc s into the g2 region.
