Bulletin of the American Physical Society
APS April Meeting 2019
Volume 64, Number 3
Saturday–Tuesday, April 13–16, 2019; Denver, Colorado
Session G17: WIMP Dark Matter I |
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Sponsoring Units: DPF Chair: Bjoern Penning Room: Sheraton Grand Ballroom II |
Sunday, April 14, 2019 8:30AM - 8:42AM |
G17.00001: Search for WIMP Dark-Matter Inelastic Interactions using a Lead Target Thomas E Ward, Alexander Androvich Rimsky-Korsakov, Nikolai e Kudryashev, Alexander e Barzilov, Denis e Beller, Jhuli e Peltoniemi A 270 live-day search for inelastic (indirect) scattering of WIMP dark matter with baryonic matter using a 300 kg Pb target and 64-element neutron multiplicity detector system (NMDS) at 583 m.w.e was undertaken at the CUPP underground facility in Finland. The study resulted in a detection limit of 3 neutral candidate events each producing ~140 neutrons in a single point interaction yielding a nucleon cross-section limit of <5.5E(-43)cm^-2 . The complete disintegration of the Pb nucleus in a central weak interaction annihilation with WIMP DM is the key signature of the indirect inelastic event. The equivalent direct (elastic) cross-section limit of <7.6E(-45)cm^-2 , based on the Compton wavelength of 8 GeV DM, is near the current detection limit for massive recoil detectors (LUX, XENON1T, PandaX-II, 2017). NMDS events induced by muons in the target were found to be within +/-15% agreement with measurements and predictions of previous underground studies at CUPP (2005) and Mei and Hime (2006) at several underground laboratories. |
Sunday, April 14, 2019 8:42AM - 8:54AM |
G17.00002: Search for Dark Matter with the PICO-60 Bubble Chamber Christopher M Jackson The PICO-60 bubble chamber contained 52 kg of superheated C3F8 and has set the world’s best limits on searches for spin-dependent (proton-coupling) dark matter. Final results from this detector will be shown, including new low-threshold data. Recent progress in measuring the nuclear recoil detection efficiency, understanding electron recoil bubble nucleation and new machine learning data analysis will be reported. |
Sunday, April 14, 2019 8:54AM - 9:06AM |
G17.00003: Status of the LZ Experiment Nicholas I Chott LUX-ZEPLIN (LZ) is a dark matter experiment under construction at the 4850’ level of the Sanford Underground Research Facility in Lead, South Dakota. The experiment utilizes a two-phase time projection chamber (TPC), containing seven active tonnes of liquefied xenon, to search for weakly interacting massive particles (WIMPs). Auxiliary veto detectors, including a liquid scintillator outer detector, improve rejection of unwanted background events in the central region of the detector. LZ has been designed to explore much of the parameter space available for WIMP models, with excellent sensitivity for WIMP masses between a few GeV and a few TeV. With data taking expected to begin in 2020, this talk will report the current status of the LZ experiment. |
Sunday, April 14, 2019 9:06AM - 9:18AM |
G17.00004: First Results from a Spin-Independent WIMP Search with COSINE-100 William Gray Thompson COSINE-100 is a direct detection dark matter search that uses low-background NaI(Tl) scintillation detectors to test DAMA/LIBRA’s claim of dark matter discovery. Located 700 meters underground at the Yangyang Underground Laboratory, COSINE-100 consists of 106 kg of low-background NaI(Tl) detectors submerged within a 2000 liter liquid scintillator veto. In this talk, I will discuss a search for one of the most common models of dark matter, the spin-independent WIMP in the standard halo model. We observe no excess of events above COSINE-100’s background model, allowing us to rule out the spin-independent interpretation of the DAMA signal as well as set the most stringent exclusion limits on spin-independent WIMP interactions in a sodium iodide detector. |
Sunday, April 14, 2019 9:18AM - 9:30AM |
G17.00005: Annual Modulation Search with the COSINE-100 NaI(Tl) Dark Mater Experiment Jay Hyun Jo COSINE-100 is a dark matter direct detection experiment with low-background NaI(Tl) crystals to test the DAMA collaboration's claimed detection of the dark matter annual modulation. The COSINE-100 experiment is situated at the Yangyang Underground Laboratory in South Korea and consists of eight NaI(Tl) crystals with a total mass of 106 kg and 2000 liters of liquid scintillator as an active veto. The physics run of the experiment began in September 2016 with a background rate of ~3 counts/kg/keV/day in the energy region between 2 and 6 keV. In this talk, recent results from the annual modulation search with COSINE-100 will be presented. |
Sunday, April 14, 2019 9:30AM - 9:42AM |
G17.00006: Dark matter search results from the first year of data in DEAP-3600 Andrew Erlandson DEAP-3600 is a novel liquid argon (LAr) based direct dark matter search located 2 km underground at SNOLAB. The detector consists of a 3279 kg LAr target contained in a radiopure acrylic vessel viewed by 255 high quantum efficiency photomultiplier tubes (PMTs). Shielding from radiogenic neutrons is provided by polyethylene and acrylic. Cosmogenic backgrounds are suppressed by immersing the detector in 373 tonnes of ultrapure water viewed by 48 outward facing PMTs. The atmospheric LAr target contributes a background of 39Ar which is heavily suppressed by the best demonstrated pulse-shape discrimination in a LAr detector. This talk will highlight the recent analysis and results from 231 live-days of data in DEAP-3600 which is the most sensitive WIMP search above a mass of 30 GeV/c2 using argon. |
Sunday, April 14, 2019 9:42AM - 9:54AM |
G17.00007: Results from the DarkSide-50 Search for Dark Matter Xinran Li DarkSide uses a dual-phase Liquid Argon Time Projection Chamber to search for WIMP dark matter. This talk will present the latest result on the search for low mass (<20GeV/c^2) and high mass (>100GeV/c^2) WIMPs from the current experiment, DarkSide-50, running since mid 2015, along with the technical achievements of the experiment. Darkside-50 is a 50-kg-active-mass TPC, filled with argon from an underground source proven to have a concentration of the radioactive 39Ar isotope at least 1000 time less than that found in the atmosphere. The successful results presented here have also paved the way for the extension of the liquid argon dark matter program into the future, such that it will reach the so-called neutrino floor for WIMP masses between 1 GeV/c^2 and hundreds of TeV/c^2 in the coming decade. |
Sunday, April 14, 2019 9:54AM - 10:06AM |
G17.00008: Dark Matter Search Results from XENON1T Joseph Howlett, Qing Lin The most recent results from XENON1T, the world largest direct dark matter search experiment, will be presented. XENON1T is a dual-phase xenon Time Projection Chamber (TPC) using 248 low radioactivity PMTs to detect scintillation signals in a 2-ton active liquid xenon target. Since November 2016, the XENON1T detector is continuously taking data, with a background rate of more than one order of magnitude lower than any current generation dark matter search experiment. This talk will summarize the dark matter search results of XENON1T using 278.8 days of data collected between November 2016 and February 2018. |
Sunday, April 14, 2019 10:06AM - 10:18AM |
G17.00009: Search for Dark Absorption with XENON1T Jingqiang Ye The XENON1T detector uses liquid xenon time projection chamber to search for nuclear recoils caused by hypothetical Weakly Interacting Massive Particles (WIMPs). With the large exposure and low electron-recoil background rate, it's also intriguing to search for dark absorption, electronic recoils produced via absorption of bosonic dark matter(dark photon, ALPs, superWIMPs), in the XENON1T detector. With the knowledge of efficiency and background, a profile likelihood analysis is used to constrain dark photon to photon kinetic mixing parameter and axion-electron coupling. |
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