Analysis of the low-energy electron-recoil spectrum of the CDMS experiment

Citations Over TimeTop 10% of 2010 papers

Abstract

We report on the analysis of the low-energy electron-recoil spectrum from the CDMS II experiment using data with an exposure of 443.2 kg-days. The analysis provides details on the observed counting rate and possible background sources in the energy range of 2--8.5 keV. We find no significant excess of a peaked contribution to the total counting rate above the background model, and compare this observation to the recent DAMA results. In the framework of a conversion of a dark matter particle into electromagnetic energy, our 90% confidence level upper limit of $0.246\text{ }\text{ }\mathrm{\text{events}}/\mathrm{kg}/\mathrm{day}$ at 3.15 keV is lower than the total rate above background observed by DAMA. In absence of any specific particle physics model to provide the scaling in cross section between NaI and Ge, we assume a ${Z}^{2}$ scaling. With this assumption the observed rate in DAMA remains higher than the upper limit in CDMS. Under the conservative assumption that the modulation amplitude is 6% of the total rate we obtain upper limits on the modulation amplitude a factor of $\ensuremath{\sim}2$ lower than observed by DAMA, constraining some possible interpretations of this modulation.

Related Papers

• Research on System Evaluation Method of Weapon Recoil(2012)
• A Study on the Reduction Technique of Recoil Force for Soft Recoil System using Dynamic Behavior(2007)
• Dynamic Characteristics of a Soft Recoil System(2008)
• Optimization Method on the Recoil Body's Quality of Recoil Barrel Automatic Mechanism(2014)