DarkSide

The DarkSide collaboration is an international affiliation of universities and labs seeking to directly detect dark matter in the form of weakly interacting massive particles (WIMPs). The collaboration is building a series of noble liquid time projection chambers (TPCs) that are designed to be employed at the Gran Sasso National Laboratory in Assergi, Italy. The detector is filled with liquid argon from underground sources^[1] in order to exclude the radioactive isotope 39
Ar, which is makes up one in every 10¹⁵ (quadrillion) atoms in atmospheric argon.^[2] The Darkside-10 prototype was tested in 2012, and the Darkside-50 experiment has been operating since 2013.

Status

Darkside-50 is operating with 46 kg of argon target mass. A 3 year run is planned and ton-scale expansion has been proposed.

Initial results using a month of running were reported in 2014.^[3] Spin-independent limits were set using 1422 kg×days of exposure to atmospheric argon. A cross section limit of 6.1×10⁻⁴⁴ cm² for a 100 Gev WIMP was found.

Members

The following institutions' physics departments include members of DarkSide:

• Augustana College, USA
• Black Hills State University, USA
• Drexel University, USA
• Fermi National Accelerator Laboratory, USA
• The University of Chicago, USA
• Princeton University, USA
• Temple University, USA
• University of Arkansas, USA
• University of California at Los Angeles, USA
• University of California at Davis, USA
• University of Houston, USA
• University of Massachusetts at Amherst, USA
• Virginia Tech, USA
• University College of London, GB
• Institute of High Energy Physics, China
• INFN - Laboratori Nazionali del Gran Sasso, Italy
• INFN – Università degli Studi di Genova, Italy
• INFN – Università degli Studi di Milano, Italy
• INFN – Università degli Studi di Napoli, Italy
• INFN – Università degli Studi di Perugia, Italy
• Jagiellonian University, Cracow, Poland
• Joint Institute for Nuclear Research, Dubna, Russia
• Lomonosov Moscow State University, Russia
• Institute for Nuclear Research of NASU, Kiev, Ukraine
• RRC Kurchatov Institute, Russia
• National Research Nuclear University, Moscow, Russia
• Institute for Theoretical and Experimental Physics, Moscow, Russia
• St. Petersburg Nuclear Physics Institute, Gatchina, Russia

See also

• ANAIS
• ArDM
• CDEX
• CDMS
• CRESST
• DAMA/NaI
• DAMA/LIBRA
• DEAP
• DRIFT
• EDELWEISS
• LZ experiment
• LUX
• PICASSO
• SIMPLE
• WARP
• XENON
• ZEPLIN-III

References

1. Lofholm, Nancy (5 October 2012). "Colorado argon will be at the heart of dark matter experiment". Denver Post.
2. "Low-background Argon from underground reservoir". DarkSide collaboration.
3. Agnes, P.; Alexander, T.; Alton, A.; Arisaka, K.; Back, H. O.; Baldin, B.; Biery, K.; Bonfini, G.; Bossa, M.; Brigatti, A.; Brodsky, J.; Budano, F.; Cadonati, L.; Calaprice, F.; Canci, N.; Candela, A.; Cao, H.; Cariello, M.; Cavalcante, P.; Chavarria, A.; Chepurnov, A.; Cocco, A. G.; Crippa, L.; D'Angelo, D.; D'Incecco, M.; Davini, S.; De Deo, M.; Derbin, A.; Devoto, A.; et al. (23 Dec 2014). "First Results from the DarkSide-50 Dark Matter Experiment at Laboratori Nazionali del Gran Sasso". Physics Letters B. 743 (456): 456. arXiv:1410.0653. doi:10.1016/j.physletb.2015.03.012.

Publications

• D.Akimov et al., “Light Yield in DarkSide-10: a Prototype Two-phase Liquid Argon TPC for Dark Matter Searches” - 2012. - arXiv:1204.6218.
• H.O. Back et al., “First Large Scale Production of Low Radioactivity Argon From Underground Sources” - 2012. – arXiv:1204.6024.
• H.O. Back et al., “First Commissioning of a Cryogenic Distillation Column for Low Radioactivity Underground Argon”. - 2012. - arXiv:1204.6061.
• J.Xu et al., “A Study of the Residual ³⁹Ar Content in Argon from Underground Sources” - 2012. - arXiv:1204.6011.
• A. Wright, P. Mosteiro, B. Loer and F. Calaprice, “A Highly Efficient Neutron Veto for Dark Matter Experiments”, Nuclear Instruments and Methods A 644, 18 (2011). - arXiv:1010.3609.
• DarkSide Collaboration, “DarkSide-50 Proposal” (2008).
• D. Acosta-Kane et al., “Discovery of underground argon with low level of radioactive ³⁹Ar and possible applications to WIMP dark matter detectors”, Nuclear Instruments and Methods A 587, 46 (2008). - arXiv:0712.0381.

External links

• Project website