Channeling in direct dark matter detection II: channeling fraction in Si and Ge crystals

Abstract

The channeling of the ion recoiling after a collision with a WIMP changes the\nionization signal in direct detection experiments, producing a larger signal\nthan otherwise expected. We give estimates of the fraction of channeled\nrecoiling ions in Si and Ge crystals using analytic models produced since the\n1960's and 70's to describe channeling and blocking effects. We used data\nobtained to avoid channeling in the implantation of dopants in Si crystals to\ntest our models.\n