Dark matter search with bubble chambers

This is an electronic image of a typical microscopic quartz particulate found during the investigation of the active mass of the PICO-2L detector after its first run. The image was taken using an EDS-SEM (scanning electron microscopy with X-ray microanalysis). Such particulate contamination was thought to be the cause for the anomalous background, and a profound effort went into its elimination (and suppression of its production) for the follow up PICO-2L WIMP-search run.

Presented here is a description of the PICO experiment, which has achieved one of the world’s best exclusions for the detection of Weakly-Interacting Massive Particles (WIMPs): the leading candidate for the Dark Matter particle.

This podcast is a little longer than usual: 8 minutes, 45 seconds.

http://news.fnal.gov/2016/07/dark-matter-search-bubble-chambers/, by Chanpreet Amole: a Ph.D. candidate at Queen’s University in Canada.

Bringing dark matter to Earth


CMS scientists have defined a new set of variables, called “razor variables,” that are being used to search for dark matter in data recorded using the Large Hadron Collider.


http://news.fnal.gov/2016/04/bringing-dark-matter-earth/, by Don Lincoln.

The lightness of dark matter

The new CDMSlite result (black solid line with salmon-shaded band), compared with some other recent results on low-mass dark matter.

No WIMP signal is yet visible in the data from CDMS (Cold Dark Matter Survey, at Fermilab). But the experiment has considerably narrowed the region where light WIMPS might be hiding.

http://www.fnal.gov/pub/today/archive/archive_2015/today15-09-22.html, by Dan Bauer.

The hunt for dark matter turns to subhalos

Can we detect dark mater from cosmic gamma rays? Experiemnters in the Fermi Gamma-Ray Space Telescope collaboration think, “Maybe so!”

http://www.fnal.gov/pub/today/archive/archive_2015/today15-06-12.html, by Dan Hooper.

Reticulum II: Welcome to the neighborhood

We have a new galactic neighbor: Reticulum II. It has an unusually high amount of dark matter in it, according to Fermilab’s Dark Energy Survey (DES) and the Dark Energy Camera (DECam).

http://www.fnal.gov/pub/today/archive/archive_2015/today15-04-17.html, by Alex Drlica-Wagner

Seeing dark matter

Seeing dark matter in old-fashioned bubble chambers. The PICO collaboration, of which Fermilab is a member (formed from the merger of PICASSO and COUPP).

http://www.fnal.gov/pub/today/archive/archive_2015/today15-04-03.html, by Alan Robinson, University of Chicago.

The Dark Energy Survey looks at massive galaxy clusters – and finds filaments

In the first paper based upon Dark Energy Survey data, scientists demonstrated that the new camera and revamped telescope worked together as expected.

http://www.fnal.gov/pub/today/archive/archive_2014/today14-05-30.html, by Peter Melchior, Ohio State University.