First Results of the Phase II SIMPLE Dark Matter Search

Abstract

We report results of a 14.1 kgd measurement with 15 superheated droplet detectors of total active mass 0.208 kg, comprising the first stage of a 30 kgd Phase II experiment. In combination with the results of the neutron-spin sensitive XENON10 experiment, these results yield a limit of |a_p| < 0.32 for M_W = 50 GeV/c2 on the spin-dependent sector of weakly interacting massive particle-nucleus interactions with a 50% reduction in the previously allowed region of the phase space formerly defined by XENON, KIMS and PICASSO. In the spin-independent sector, a limit of 2.3x10-5 pb at M_W = 45 GeV/c2 is obtained.

arXiv comment4 pages, 4 figures; PRL-accepted version with corrected SI contour (Fig. 4)

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• Light dark matter and $Z^{\prime }$ dark force at colliders
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• New Insights into Particle Detection with Superheated Liquids
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• Determining Ratios of WIMP-Nucleon Cross Sections from Direct Dark Matter Detection Data
• Fabrication and Response of High Concentration SIMPLE Superheated Droplet Detectors with Different Liquids
• Comparing readout strategies to directly detect dark matter
• Determining the bubble nucleation efficiency of low-energy nuclear recoils in superheated C${}_3$F${}_8$ dark matter detectors
• Molecular dynamics simulations of bubble nucleation in dark matter detectors
• Neutron background signal in superheated droplet detectors of the Phase II SIMPLE dark matter search
• Detection Prospects for Majorana Fermion WIMPless Dark Matter
• Comments on "First Results of the Phase II SIMPLE Dark Matter Search"
• Study of acoustic emission due to vaporisation of superheated droplets at higher pressure
• Study of gamma ray response of R404A superheated droplet detector using a two-state model
• Predicted modulated differential rates for direct WIMP searches at low energy transfers
• Neutralino-hadron scattering in the NMSSM
• Measuring the cross section of the ${}^{15}$N($\alpha$,$\gamma$)${}^{19}$F reaction using a single-fluid bubble chamber
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• Instrumentation, acquisition and analysis of the Phase II SIMPLE dark matter search signals
• Searching for light WIMPS via their interaction with electrons