The ArDM experiment
The aim of the ArDM project is the development and operation of a one ton double-phase liquid argon detector for direct Dark Matter searches. The detector measures both the scintillation light and the ionization charge from ionizing radiation using two independent readout systems. This paper briefly describes the detector concept and presents preliminary results from the ArDM R&D program, includin
First Dark Matter Search Results from a Surface Run of the 10-L DMTPC Directional Dark Matter Detector
The Dark Matter Time Projection Chamber (DMTPC) is a low pressure (75 Torr CF4) 10 liter detector capable of measuring the vector direction of nuclear recoils with the goal of directional dark matter detection. In this paper we present the first dark matter limit from DMTPC. In an analysis window of 80-200 keV recoil energy, based on a 35.7 g-day exposure, we set a 90% C.L. upper limit on the spin
Results from the Final Exposure of the CDMS II Experiment
We report results from a blind analysis of the final data taken with the Cryogenic Dark Matter Search experiment (CDMS II) at the Soudan Underground Laboratory, Minnesota, USA. A total raw exposure of 612 kg-days was analyzed for this work. We observed two events in the signal region; based on our background estimate, the probability of observing two or more background events is 23%. These data se
First Dark Matter Results from the XENON100 Experiment
The XENON100 experiment, in operation at the Laboratori Nazionali del Gran Sasso in Italy, is designed to search for dark matter WIMPs scattering off 62 kg of liquid xenon in an ultra-low background dual-phase time projection chamber. In this letter, we present first dark matter results from the analysis of 11.17 live days of non-blind data, acquired in October and November 2009. In the selected f
Neutrino and axion hot dark matter bounds after WMAP-7
We update cosmological hot dark matter constraints on neutrinos and hadronic axions. Our most restrictive limits use 7-year data from the Wilkinson Microwave Anisotropy Probe for the cosmic microwave background anisotropies, the halo power spectrum (HPS) from the 7th data release of the Sloan Digital Sky Survey, and the Hubble constant from Hubble Space Telescope observations. We find 95% C.L. upp
Dark Matter Candidates from Particle Physics and Methods of Detection
The identity of dark matter is a question of central importance in both astrophysics and particle physics. In the past, the leading particle candidates were cold and collisionless, and typically predicted missing energy signals at particle colliders. However, recent progress has greatly expanded the list of well-motivated candidates and the possible signatures of dark matter. This review begins wi
「暗黒物質」とらえる目、東大施設でほぼ完成 : ニュース : 宇宙 : YOMIURI ONLINE（読売新聞）
宇宙の２３％を占めながら、従来の手法では観測できない謎の「暗黒物質」（ダークマター）を検出する“目”が、東京大学の神岡宇宙素粒子研究施設（岐阜県飛騨市）にほぼ完成した。 ミラーボールのような直径約１メートルの６０面体が「ＸＭＡＳＳ検出器」だ。表面にぎっしり並ぶ赤銅色の金属板の奥に、極めて微弱な光をとらえる６４２個のセンサーがある。今夏の稼働に向け、準備が進む。 検出器の姿が人目に触れるのは、この１〜２か月間だけ。春には密封容器に入れて、鉱山跡の地下の水槽に沈められる。観測時には、密封容器を液体キセノンで満たし、その原子核に暗黒物質がぶつかって、かすかな光が出てくるのを待ち受ける。
Performance of scintillation materials at cryogenic temperatures
An increasing number of applications of scintillators at low temperatures, particularly in cryogenic experiments searching for rare events, has motivated the investigation of scintillation properties of materials over a wide temperature range. This paper provides an overview of the latest results on the study of luminescence, absorption and scintillation properties of materials selected for rare e
Terrestrial and Solar Limits on Long-Lived Particles in a Dark Sector
Dark matter charged under a new gauge sector, as motivated by recent data, suggests a rich GeV-scale "dark sector" weakly coupled to the Standard Model by gauge kinetic mixing. The new gauge bosons can decay to Standard Model leptons, but this mode is suppressed if decays into lighter dark sector particles are kinematically allowed. These particles in turn typically have macroscopic decay lifetime
A SQUID-based microwave cavity search for dark-matter axions
Axions in the micro eV mass range are a plausible cold dark matter candidate and may be detected by their conversion into microwave photons in a resonant cavity immersed in a static magnetic field. The first result from such an axion search using a superconducting first-stage amplifier (SQUID) is reported. The SQUID amplifier, replacing a conventional GaAs field-effect transistor amplifier, succes
ダークマター探索に新兵器！
これが、その｢scintillating bolometer（輝くボロメーター）｣？ 全然そうは見えないんですけどねー。 スペインのサラゴサ大学の物理学者Eduardo Abancens氏のチームが開発した｢ダークマター検出装置｣なるものの試作機です。 ダークマター（宇宙暗黒物質）は、宇宙の闇に漂っている観測不能なモノ。物理学者たちによると、全宇宙を構成するもののうち現在観測可能なものはたった5%程度に過ぎないんだそうな。遠くの星雲の動きなんかを観測すると目に見えるものの引力だけでは到底説明のつかない現象もあり、専門家の間ではそうした目に見えないダークマターが大体20%で、残る75%はダークエネルギーやら斥力やらだという説もあります。 で、この｢scintillating bolometer｣ですが、これは理論上、ダークマターも検出できる装置ということになってます。 決め手はクリスタル。も
Dark Matter Spin-Dependent Limits for WIMP Interactions on 19-F by PICASSO
The PICASSO experiment at SNOLAB reports new results for spin-dependent WIMP interactions on $^{19}$F using the superheated droplet technique. A new generation of detectors and new features which enable background discrimination via the rejection of non-particle induced events are described. First results are presented for a subset of two detectors with target masses of $^{19}$F of 65 g and 69 g r
Axions as Dark Matter Particles
We review the current status of axions as dark matter. Motivation, models, constraints and experimental searches are outlined. The axion remains an excellent candidate for the dark matter and future experiments, particularly the Axion Dark Matter eXperiment (ADMX), will cover a large fraction of the axion parameter space.
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Results of a Laboratory Search for Cosmic Axions and Other Weakly Coupled Light Particles.
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