NIST researchers recently have measured the single electron spectrum
of a semiconductor heterostructure containing InAs self-assembled quantum dots.
The authors measured the Compton-recoil electron spectrum
, first in the energy region of the so-called Compton profile and more recently in the regime of largest momentum transfer to the bound electrons.
Beacon, which will also sample the electron spectrum
over the poles, handles Polar BEAR's data transmissions.
While bumps in the cosmic ray electron spectrum have been measured before, they didn't cover the energy range seen in the ATIC experiment, Butt says.
Dan Hooper, a theoretical physicist at the University of Chicago, says the presence of another theoretical dark matter particle--the neutralino--could account for the bump in the cosmic ray electron spectrum.