Ponente
Descripción
Liquid Argon (LAr) Time Projection Chambers (TPC) operating in double-phase detect the nuclear recoils (NR) possibly caused by the elastic scattering of dark matter WIMP particles via light signals from both scintillation and ionization processes.
In the scenario of a low-mass WIMP (< 2 GeV/c^{2}), the energy range for the NRs would be below 20 keV, thus making it crucial to characterize the charge yield from ionization as the lone available channel at such low energy.
The ReD project, within the Global Argon Dark Matter Collaboration, aims to measure the charge yield of a LAr TPC down to 2 keV recoil energy.
The measurement is being performed at the INFN Sezione of Catania. Neutrons emitted by spontaneous fission are tagged by detecting the accompanying radiation with two BaF_{2} detectors, which are used as start for time of flight (TOF) measurement. The neutron emission is collimated inside a cone with an opening of 2° and sent through the TPC. Finally, the neutron eventually scattered in the TPC is detected by 18 1-in plastic scintillators covering the angular range 12°-17°.
The TOF of the neutron interacting in the TPC is used to reconstruct the neutron kinetic energy and to calculate the Ar recoil energy.
The calibration of the TPC is performed by using low-energy internal sources of 83mKr and 37Ar diffused inside the TPC.
In this contribution, we describe the experimental setup and the strategy adopted.
