The NEWS-G Experiment
Patrick Knights, Kostas Nikolopoulos
The New Experiments With Spheres – Gas (NEWS-G) network are a number of experiments working with the novel technology of a spherical proportional counter (SPC). The benefits of such a technology are;
The applications of such a versatile detector are many, including gamma ray and neutron spectroscopy, coherent nuclear neutrino scattering, double beta-decay searches and Dark Matter (DM) detection. SeDiNe (Spherical Detector of Neutrons) is one such sphere, 60 cm in diameter and made from low activity copper and installed at the Laboratoire Souterrain de Modane (LSM). Initially implemented to investigate the low thermal and fast neutron fluxes in the lab, SeDiNe has also been used to look for low mass dark matter particle candidates, and recently published a new limit for a 0.5 GeV/c2 DM candidate. In late 2018 a 1.4 m diameter copper sphere will be installed in SNOLAB in Canada. As the second deepest and the cleanest underground laboratory in the world, SNOLAB offers a shelter from cosmic rays and secondary particles. The main physics aims will be to search for:
- Dark matter candidates with a mass in the range 0.1 GeV/c2 to 5 GeV/c2 through spin independent couplings
- Kaluza Klein axions through twi photon decay channel
- Dark matter candidates with spin dependent couplings through the selection of gases containing hydrogen
The Particle Physics group at the University of Birmingham is involved in research and development for the next stages of the project as well as simulation studies.