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Detectability of Light Dark Matter with Superfluid Helium.
Katelin Schutz1, Kathryn M Zurek1
1Theoretical Physics Group, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA and Berkeley Center for Theoretical Physics, University of California, Berkeley, California 94720, USA.
Physical Review Letters
|October 1, 2016
Summary
This study demonstrates a novel method using superfluid helium to detect low-mass dark matter (DM). This technique significantly enhances sensitivity to keV-range dark matter, surpassing current capabilities.
Area of Science:
- Particle Physics
- Astrophysics
- Condensed Matter Physics
Background:
- Direct detection experiments aim to identify dark matter particles.
- Superfluid helium offers unique properties for sensitive energy deposition measurements.
- Current methods have limitations in probing low-mass dark matter candidates.
Purpose of the Study:
- To explore a new method for dark matter detection using superfluid helium.
- To extend the reach of dark matter detection to lower mass ranges.
- To leverage specific physical processes in helium for enhanced sensitivity.
Main Methods:
- Utilizing a two-excitation process in superfluid helium.
- Employing detectors sensitive to meV (milli-electronvolt) energy depositions.
- Analyzing the kinematics of athermal excitations for signal identification.
Main Results:
- Probed dark matter down to the ~keV warm dark matter mass limit.
- Achieved a mass reach 3 orders of magnitude lower than ordinary nuclear recoils in helium.
- Identified a potential background suppression mechanism based on excitation momentum.
Conclusions:
- The two-excitation process in superfluid helium is a promising avenue for detecting low-mass dark matter.
- This method offers unprecedented sensitivity to keV-scale dark matter.
- The inherent kinematic properties can aid in distinguishing signals from background noise.
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