Abstract
We developed a three-dimensional gaseous tracking device and performed a direction-sensitive dark matter search in a surface laboratory. By using 150 Torr carbon-tetrafluoride (CF4) gas, we obtained a sky map drawn with the recoil directions of the carbon and fluorine nuclei, and set the first limit on the spin-dependent WIMP (Weakly Interacting Massive Particles)-proton cross section by a direction-sensitive method. Thus, we showed that a WIMP-search experiment with a gaseous tracking device can actually set limits. Furthermore, we demonstrated that this method will potentially play a certain role in revealing the nature of dark matter when a low-background large-volume detector is developed.
Highlights
Revealing the nature of dark matter has received much more attention since the successive results of the WMAP cosmic microwave background all-sky observation[1]
We developed a μ-time projection chambers (TPC) with a detection volume of 23 × 28 × 30 cm3 and performed a direction-sensitive Weakly interacting massive particles (WIMPs)-search experiment in a surface laboratory
We developed a three-dimensional tracking device, and performed a directionsensitive dark matter search measurement in a surface laboratory
Summary
Revealing the nature of dark matter has received much more attention since the successive results of the WMAP cosmic microwave background all-sky observation[1]. After a general-purposed detector R&D, we studied the performance of a μ-TPC with a detection volume of 10 × 10 × 10cm using a 150 Torr CF4 gas as our first step towards a dark matter experiment[24]. The size is of the μ-PIC is restricted by the working size of the PCB, and we plan to realize a larger readout area by placing many pieces, for instance 4 × 4 pieces for a 1 m2, of μ-PICs. Before we take the technology steps, we performed a first direction-sensitive spin-dependent dark matter search experiment to demonstrate that a gaseous detector and a direction-sensitive method can set limits on the WIMPs. We report on the results of a direction-sensitive dark matter search experiment using this large-volume μ-TPC with a 150 Torr CF4 gas (9.0g effective mass) in a surface laboratory. We still suffer from discharge problems when operating a μ-PIC alone
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