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X-WR-CALDESC:Events for INPA
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TZID:America/Los_Angeles
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TZOFFSETFROM:-0800
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DTSTART:20190310T100000
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BEGIN:VEVENT
DTSTART;TZID=America/Los_Angeles:20190301T120000
DTEND;TZID=America/Los_Angeles:20190301T130000
DTSTAMP:20260526T120031
CREATED:20190222T173049Z
LAST-MODIFIED:20190227T000936Z
UID:548-1551441600-1551445200@inpa.lbl.gov
SUMMARY:Dr. Quentin Riffard (LBL) - Direct detection of Dark Matter: from LUX to LZ
DESCRIPTION:Liquid xenon two-phase time projection chamber (TPC) is one of the most promising technologies for WIMP dark matter direct detection. By using this technology\, the LUX\, XENON1T\, and PANDAX-II collaborations established the most stringent limits on WIMP-nucleus cross section above 10 GeV. For WIMP searches\, the expected signal is composed of nuclear recoils (NR)\, while our background is composed by both electron recoils (ER) and NR. The limits on the WIMP-nucleus cross section are extracted using a Profile Likelihood Ratio (PLR). The usage of the PLR requires a precise knowledge of signal and background models. In the first section\, I will focus on the improvement of the detector response modeling and the re-analysis of the background model for LUX Run4 analyses. The LUX Run4 represents a challenge for the modeling of the detector response as several experimental parameters vary as a function of time. Then I will present a new detector response model based on the NEST yield model to consider those variations. This new model has been tuned on Run4 calibration data across many electric fields. After the decommissioning of the LUX experiment\, some parts of the detector have been re-assayed to reevaluate the activity of the contaminants. I’m developing a new background model based on a Monte-Carlo simulation of the detector and those new measurements. Once achieved\, this background model will be used in future analyses. I used the new detector response model to test the impact of the electric field and the light collection efficiency on detector sensitivity for several dark matter models. \nAmong few collaborations\, the LUX-ZEPLIN (LZ) is currently building one of the next generation of dark matter detector. The NR response detector calibration is a fundamental aspect of dark matter searches. I am involved in development of a photo-neutron source for the low energy NR calibration of the detector. By using a Monte-Carlo simulation\, we determined the expected event rate. Moreover\, by using photo neutron simulations\, I also identify a plausible low energy calibration source. After Xe neutron capture\, we have the emission of very high energy gammas ~ 9 MeV and a ~300 eV NR. In some case only the NR is visible as the gamma can escape the LXe without depositing any energy. By using the veto to tag this neutron capture reaction\, I show that we have a new possible low energy NR internal calibration source.
URL:https://inpa.lbl.gov/event/dr-quentin-riffard-uc-berkeley-direct-detection-of-dark-matter-from-lux-to-lz/
LOCATION:50A-5132- Sessler\, 50A-5132 Sessler Conference Room\, CA
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BEGIN:VEVENT
DTSTART;TZID=America/Los_Angeles:20190308T120000
DTEND;TZID=America/Los_Angeles:20190308T130000
DTSTAMP:20260526T120031
CREATED:20190118T190951Z
LAST-MODIFIED:20190417T151202Z
UID:498-1552046400-1552050000@inpa.lbl.gov
SUMMARY:NO INPA SEMINAR MTG
DESCRIPTION:
URL:https://inpa.lbl.gov/event/adam-bernstein-llnl/
LOCATION:50A-5132- Sessler\, 50A-5132 Sessler Conference Room\, CA
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/Los_Angeles:20190315T120000
DTEND;TZID=America/Los_Angeles:20190315T130000
DTSTAMP:20260526T120031
CREATED:20190313T211459Z
LAST-MODIFIED:20190417T151143Z
UID:578-1552651200-1552654800@inpa.lbl.gov
SUMMARY:NO INPA SEMINAR MTG
DESCRIPTION:
URL:https://inpa.lbl.gov/event/no-inpa-seminar/
LOCATION:50A-5132- Sessler\, 50A-5132 Sessler Conference Room\, CA
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/Los_Angeles:20190322T120000
DTEND;TZID=America/Los_Angeles:20190322T130000
DTSTAMP:20260526T120031
CREATED:20190305T175138Z
LAST-MODIFIED:20190311T222024Z
UID:565-1553256000-1553259600@inpa.lbl.gov
SUMMARY:Aaron Manalaysay (UC Davis) - 178 nm: The magic of liquid xenon and the search for dark matter
DESCRIPTION:The introduction of liquid-xenon (LXe) to the field of dark-matter direct detection caused a paradigm shift in this search. Primarily focused on the search for the Weakly Interacting Massive Particle\, LXe detectors have improved our sensitivity to these dark-matter candidates by a factor of 10\,000 since their introduction roughly ten years ago\, compared to the factor of 50 sensitivity improvement that the field had covered in the twenty years before that. The rapid pace at which LXe detectors have pushed the field is due in part to their ability to scale to arbitrarily large size\, thereby drastically reducing the rates of background signals in these rare-event searches. Though these detectors have seen tremendous successes\, each result has been accompanied by its own set of challenges to be overcome\, which will also be true for the next generation experiments. I will describe the most recent such U.S.-based experiment\, LUX\, and highlight the key innovative analyses that led to its impressive results. I will extend the discussion to cover LUX’s upcoming LBL-led successor\, LZ\, which will be sensitive to WIMP-nucleus interactions as rare as roughly 0.5 events/kg/millennium. Time permitting\, I will expand the view by discussing the ways in which LXe is a powerful tool for probing non-WIMP dark-matter candidates.
URL:https://inpa.lbl.gov/event/aaron-manalaysay-uc-davis/
LOCATION:50A-5132- Sessler\, 50A-5132 Sessler Conference Room\, CA
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/Los_Angeles:20190329T120000
DTEND;TZID=America/Los_Angeles:20190329T130000
DTSTAMP:20260526T120031
CREATED:20190118T193206Z
LAST-MODIFIED:20190326T181647Z
UID:502-1553860800-1553864400@inpa.lbl.gov
SUMMARY:Morgan Askins (UCB) - Search for invisible nucleon decay in the SNO+ detector
DESCRIPTION:Many Grand Unified Theories predict processes that would allow baryons to decay to leptons\, violating baryon number conservation. The observation of baryon number violation in nucleon decay would be a revelation as well as being pivotal in understanding the apparent asymmetry between baryons and anti-baryons in the universe. This is manifest in some theories primarily through the decay of nucleons to three chargeless leptons (e.g. n to 3 neutrino)\, which can only be observed through the resulting nuclear deexcitation gamma. This “invisible” nucleon decay could be observable in water through the deexcitation of the resulting oxygen-15 nucleus which emits a 6.2 MeV gamma and requires that backgrounds at these energies\, in a large detector\, to be extremely low. Presented here are the first results from the SNO+ light water phase which consists of nearly 120 days of live data taking. A blind analysis was performed using a Poisson counting method and a maximum likelihood method independently to obtain the results.
URL:https://inpa.lbl.gov/event/morgan-askins-ucb/
LOCATION:50A-5132- Sessler\, 50A-5132 Sessler Conference Room\, CA
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