BEGIN:VCALENDAR VERSION:2.0 PRODID:-//CERN//INDICO//EN BEGIN:VEVENT SUMMARY:Characterizing electroluminescence region of the NEXT high pressur e gaseous xenon TPC with Kr gas DTSTART;VALUE=DATE-TIME:20210915T203000Z DTEND;VALUE=DATE-TIME:20210915T204500Z DTSTAMP;VALUE=DATE-TIME:20260510T044615Z UID:indico-contribution-7-93@indico.physics.ucsd.edu DESCRIPTION:Speakers: Jonathan Haefner (Harvard University)\nThe NEXT expe riment is a neutrino physics program searching for neutrinoless double bet a decay using high pressure gaseous xenon time projection chambers (HPGXeT PC). The HPGXeTPC technology offers several advantages\, including excelle nt energy resolution\, topological event discrimination\, and calibration with gaseous\, radioactive krypton. We will discuss the power of this cali bration technique for characterizing the electroluminescence region\, wher e S2 signals are produced. We discuss the impact of variation in the volta ge on light production and event detection\, as well as demonstrating capa bility to extract structural information about the EL gap from Kr calibrat ion data. We will furthermore show an improved understanding of diffusion related effects in our detector.\n\nhttps://indico.physics.ucsd.edu/event/ 1/contributions/93/ LOCATION: URL:https://indico.physics.ucsd.edu/event/1/contributions/93/ END:VEVENT BEGIN:VEVENT SUMMARY:Measurement of the Scintillation Light Triggering Efficiency in Mi croBooNE DTSTART;VALUE=DATE-TIME:20210915T213000Z DTEND;VALUE=DATE-TIME:20210915T214500Z DTSTAMP;VALUE=DATE-TIME:20260510T044615Z UID:indico-contribution-7-89@indico.physics.ucsd.edu DESCRIPTION:Speakers: Vincent Basque (Fermilab)\nThe MicroBooNE Liquid Arg on Time Projection Chamber (LArTPC) has been collecting data since 2015 as part of the Short-Baseline Neutrino (SBN) program using the Booster Neutr ino Beam (BNB) at Fermilab. Its primary physics goal is to contribute to a ddressing the elusive eV-scale sterile neutrino anomaly. MicroBooNE record s and utilises both the ionisation charge and scintillation light produced inside the TPC to reconstruct its events. The latter is collected through a plane of PhotoMultiplier Tubes (PMTs) and is used for accurate event ti ming and cosmic muon rejection. A data-driven method to estimate the scint illation light triggering efficiency from prompt scintillation light for l ow energy cosmic muons will be presented. Results obtained from this metho d are crucial for many analyses that aim to measure low energy interaction s\, and inform triggering strategies in LArTPCs in the SBN and future DUNE programmes.\n\nhttps://indico.physics.ucsd.edu/event/1/contributions/89/ LOCATION: URL:https://indico.physics.ucsd.edu/event/1/contributions/89/ END:VEVENT BEGIN:VEVENT SUMMARY:Salting as a bias mitigation technique in LUX-ZEPLIN (LZ) DTSTART;VALUE=DATE-TIME:20210915T204500Z DTEND;VALUE=DATE-TIME:20210915T210000Z DTSTAMP;VALUE=DATE-TIME:20260510T044615Z UID:indico-contribution-7-24@indico.physics.ucsd.edu DESCRIPTION:Speakers: Tyler Anderson (SLAC)\nAs LZ prepares to push the li mits of known physics and improve our understanding of the nature of dark matter\, it is important to ensure that these gains are not mistakenly inf luenced by human biases towards achieving such results. Such biases often appear in the process of analysis when unconsciously or consciously expect ing certain outcomes. Many techniques for avoiding these biases have been employed over the years including blinding and using hidden parameters. LZ will be using a method known as salting\, in which fake signal events are injected into our data stream and removed after analysis is complete. In this presentation I will explain the historical motivations for pursuing b ias mitigation\, the process through which LZ salts its data\, and some re sults after salting LZ’s simulated mock data challenges.\n\nhttps://indi co.physics.ucsd.edu/event/1/contributions/24/ LOCATION: URL:https://indico.physics.ucsd.edu/event/1/contributions/24/ END:VEVENT BEGIN:VEVENT SUMMARY:Measurement of the total neutron cross section on argon in the 30 to 70 keV energy range DTSTART;VALUE=DATE-TIME:20210915T214500Z DTEND;VALUE=DATE-TIME:20210915T220000Z DTSTAMP;VALUE=DATE-TIME:20260510T044615Z UID:indico-contribution-7-52@indico.physics.ucsd.edu DESCRIPTION:Speakers: Tyler Erjavec (University of California Davis)\nThe use of liquid argon as a detection and shielding medium for neutrino and d ark matter experiments has made the precise knowledge of the cross section for neutron interactions on argon an important design and operational par ameter. Nevertheless\, there has been a lingering discrepancy between the total cross-section in the 30-70 keV region given in the Evaluated Nuclear Data File (ENDF) and the single measurement done in the 1990's by an expe riment optimized for higher energy. This discrepancy is significant in tha t the former predicts a large negative resonance in the region while the m easurement did not report such a feature\, giving rise to significant unce rtainty in the penetration depth of neutrons through liquid argon. This ta lk presents results from the Argon Resonant Transport Interaction Experime nt (ARTIE) at the Los Alamos Neutron Science Center (LANSCE)\, the first d edicated experiment optimized for this energy region. The ARTIE measuremen t of the total cross-section as a function of energy confirms the existenc e of a negative resonance in this region\, but not quite as deep as the EN DF prediction.\n\nhttps://indico.physics.ucsd.edu/event/1/contributions/52 / LOCATION: URL:https://indico.physics.ucsd.edu/event/1/contributions/52/ END:VEVENT BEGIN:VEVENT SUMMARY:A first-principles approach to electron-ion recombination in liqui d xenon DTSTART;VALUE=DATE-TIME:20210915T201500Z DTEND;VALUE=DATE-TIME:20210915T203000Z DTSTAMP;VALUE=DATE-TIME:20260510T044615Z UID:indico-contribution-7-33@indico.physics.ucsd.edu DESCRIPTION:Speakers: Olivia Piazza ()\nA simulation was developed to expl ore the micro-physics of electron-ion recombination and recombination fluc tuations in liquid xenon detectors. Generating primary mono-energetic par ticles between 100eV and 10keV with a drift field of 50V/cm to 2000V/cm\, the model characterizes recombination events and predicts ionization yield s. Of particular interest\, the simulation utilizes realistic electron tra nsport kinematics and the Cohen-Lekner ‘hot electron’ framework to des cribe the reduced influence of the liquid structure of xenon on the scatte ring of low energy electrons. Results obtained can be useful in the search for dark matter candidates and neutrino detections.\n\nhttps://indico.phy sics.ucsd.edu/event/1/contributions/33/ LOCATION: URL:https://indico.physics.ucsd.edu/event/1/contributions/33/ END:VEVENT BEGIN:VEVENT SUMMARY:Optical Modeling and Position Reconstruction for DarkSide-20k DTSTART;VALUE=DATE-TIME:20210915T211500Z DTEND;VALUE=DATE-TIME:20210915T213000Z DTSTAMP;VALUE=DATE-TIME:20260510T044615Z UID:indico-contribution-7-76@indico.physics.ucsd.edu DESCRIPTION:Speakers: Michael Poehlmann (University of California\, Davis) \nDarkSide-20k is a next-generation direct dark matter search experiment u nder construction at the Gran Sasso National Laboratory (LNGS) in Italy. T he core of the detector is a two-phase liquid argon time projection chambe r designed to probe WIMP interactions down to the neutrino floor. To ensur e the 200 ton-year exposure has zero instrumental backgrounds\, low-radioa ctivity underground argon is used as the detector medium. Backgrounds from detector surfaces are primarily rejected through fiducialization\, which requires accurate reconstruction of event vertices. Monte Carlo simulation s of interactions within the detector have been used to study the position reconstruction resolution of DarkSide-20k. In this talk\, I present the d etector optical model and discuss the performance of machine learning-base d position reconstruction algorithms on simulated DarkSide-20k datasets.\n \nhttps://indico.physics.ucsd.edu/event/1/contributions/76/ LOCATION: URL:https://indico.physics.ucsd.edu/event/1/contributions/76/ END:VEVENT BEGIN:VEVENT SUMMARY:Lightmap reconstruction in nEXO with an internal xenon 127 source DTSTART;VALUE=DATE-TIME:20210915T210000Z DTEND;VALUE=DATE-TIME:20210915T211500Z DTSTAMP;VALUE=DATE-TIME:20260510T044615Z UID:indico-contribution-7-99@indico.physics.ucsd.edu DESCRIPTION:Speakers: Clarke Hardy (Stanford University)\nThe nEXO experim ent is a planned ton-scale liquid xenon time projection chamber (TPC) desi gned to search for neutrinoless double beta decay (0vBB) with a half-life sensitivity beyond 10$^{28}$ years. Optimal energy resolution in nEXO requ ires the precise reconstruction of the scintillation light signal\, correc ted by the position- and time-dependent light collection efficiency (or “lightmap”) throughout the active volume. An injected xenon 127 source is being considered for the lightmap reconstruction as it allows for in-s itu calibrations of the light response\, particularly in the center of the TPC where the use of external sources is limited by the attenuation of ga mmas in the liquid xenon. Multiple potential techniques for lightmap recon struction are being explored\, including a neural net and a kernel smoothi ng algorithm. This talk will present projections of the lightmap reconstru ction capability from simulated xenon 127 decays and a discussion of the t echniques involved.\n\nhttps://indico.physics.ucsd.edu/event/1/contributio ns/99/ LOCATION: URL:https://indico.physics.ucsd.edu/event/1/contributions/99/ END:VEVENT BEGIN:VEVENT SUMMARY:Physics Modeling of Xenon and Argon detectors with the Noble Eleme nt Simulation Technique (NEST) DTSTART;VALUE=DATE-TIME:20210915T200000Z DTEND;VALUE=DATE-TIME:20210915T201500Z DTSTAMP;VALUE=DATE-TIME:20260510T044615Z UID:indico-contribution-7-75@indico.physics.ucsd.edu DESCRIPTION:Speakers: Kirsten McMichael (Rensselaer Polytechnic Institute) \nThe Noble Element Simulation Technique (NEST) is a C++ package with opti onal GEANT4 integration and a Python equivalent (nestpy) that accurately s imulates the scintillation\, ionization\, and electroluminescence processe s in xenon and argon. Using a combination of empirical and first principle methods\, NEST models the intrinsic physics of noble detectors while main taining a format that is accessible and customizable for users. I will pre sent key results including energy resolution and light and charge yields o f various interactions with noble elements. I will also discuss recent and future updates to the code including further development of the argon mod el\, improvements to the ER model\, and new modeling to describe the W-val ue discrepancy between NEST and the EXO-200 results.\n\nhttps://indico.phy sics.ucsd.edu/event/1/contributions/75/ LOCATION: URL:https://indico.physics.ucsd.edu/event/1/contributions/75/ END:VEVENT END:VCALENDAR