New limits on dark--matter WIMPs from the Heidelberg--Moscow experiment
L. Baudis, J. Hellmig, G. Heusser, H.V. Klapdor--Kleingrothaus, S., Kolb, B. Majorovits, H. P\"as, Y. Ramachers, H. Strecker, (Max--Planck--Institut fuer Kernphysik, Heidelberg, Germany) V. Alexeev, A., Bakalyarov, A. Balysh, S.T. Belyaev, V.I. Lebedev, S. Zhukov (Russian
TL;DR
This paper reports new, highly sensitive limits on dark matter WIMPs based on extensive germanium detector measurements, setting the most stringent constraints to date on their interaction cross section.
Contribution
It provides the first limits on WIMP interactions using raw data from the Heidelberg--Moscow experiment without background subtraction.
Findings
Most stringent limits on spin-independent WIMP-nucleon cross section to date
Achieved low background level of 0.042 counts/(kg d keV)
Energy threshold of 9 keV
Abstract
New results after 0.69 kg yr of measurement with an enriched 76Ge detector of the Heidelberg--Moscow experiment with an active mass of 2.758 kg are presented. An energy threshold of 9 keV and a background level of 0.042 counts/(kg d keV) in the energy region between 15 keV and 40 keV was reached.The derived limits on the WIMP--nucleon cross section are the most stringent limits on spin--independent interactions obtained to date by using essentially raw data without background subtraction.
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