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X-WR-CALNAME:LBNL Physics Division Research Progress Meetings
X-ORIGINAL-URL:https://rpm.physics.lbl.gov
X-WR-CALDESC:Events for LBNL Physics Division Research Progress Meetings
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TZID:America/Los_Angeles
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TZOFFSETFROM:-0800
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DTSTART:20180311T100000
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BEGIN:VEVENT
DTSTART;TZID=America/Los_Angeles:20181204T160000
DTEND;TZID=America/Los_Angeles:20181204T170000
DTSTAMP:20260413T121534
CREATED:20181107T084111Z
LAST-MODIFIED:20181107T084111Z
UID:946-1543939200-1543942800@rpm.physics.lbl.gov
SUMMARY:Danielle Norcini (Yale) "PROSPECTing for reactor neutrinos at short baselines"
DESCRIPTION:ABSTRACT:\nExperiments at nuclear reactors have played a key role in determining the properties of the weakly-interacting neutrinos. PROSPECT is a next-generation experiment studying reactor neutrinos at very short baselines (< 10m) in an environment with limited shielding from cosmogenic backgrounds. Commissioned in March 2018\, the compact\, segmented detector unambiguously observed neutrinos in its first 2 hours of operation. In the months following\, PROSPECT has performed a world-leading search for “sterile” neutrino oscillations and made the world-leading measurement of the uranium-235 antineutrino energy spectrum. This talk will detail the detector design\, construction\, and first physics results.
URL:https://rpm.physics.lbl.gov/event/danielle-norcini-yale-tba/
LOCATION:HYBRID 50A-5132 (Sessler Conference Room)\, https://lbnl.zoom.us/j/91782268585\, 50A-5132
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BEGIN:VEVENT
DTSTART;TZID=America/Los_Angeles:20181211T160000
DTEND;TZID=America/Los_Angeles:20181211T170000
DTSTAMP:20260413T121534
CREATED:20181101T091933Z
LAST-MODIFIED:20181101T091933Z
UID:929-1544544000-1544547600@rpm.physics.lbl.gov
SUMMARY:Scott Haselschwardt (UCSB) "  Expected Performance of the LZ Outer Detector and a  Radioassay of its Gadolinium-Loaded Liquid  Scintillator"
DESCRIPTION:ABSTRACT:\nThe LZ (LUX-ZEPLIN) experiment is a second generation direct dark matter detector under construction at the Sanford Underground Research Facility (SURF) in Lead\, South Dakota\, USA. LZ will use a 7 tonne central liquid xenon target\, arranged in a dual-phase time projection chamber (TPC)\, to seek evidence for nuclear recoils from a hypothesized galactic flux of weakly interacting massive particles (WIMPs). Surrounding the LZ TPC will be an outer detector (OD) consisting of 17.3 tonnes of LAB-based gadolinium-loaded liquid scintillator (GdLS). The OD’s primary functions will be to tag neutron single-scatter events in the liquid xenon which could mimic a WIMP dark matter signal and to characterize the radiation environment of LZ. In this talk\, I summarize the expected performance of the OD and report on the design and results of the “Screener”\, a small liquid scintillator detector consisting of ≈ 23 kg of the GdLS to be used in the OD. The Screener was operated in the ultra-low-background environment of the former LUX water shield in the Davis Laboratory at SURF for radioassay of the GdLS. Careful selection of detector materials and use of ultra-low-background PMTs allows the measurement of a variety of radioimpurities. In particular\, the 14C/12C ratio in the scintillator is measured\, while the use of pulse shape discrimination allows the concentration of isotopes throughout the 238U\, 235U\, and 232Th chains to be measured by fitting the collected spectra from α and β events. The GdLS is found to meet the requirements for LZ\, however\, more aggressive purification is being implemented for the final GdLS product that ensures the OD will successfully carry out its role in the hunt for WIMP dark matter.
URL:https://rpm.physics.lbl.gov/event/scott-haselschwardt-tba-tba/
LOCATION:HYBRID 50A-5132 (Sessler Conference Room)\, https://lbnl.zoom.us/j/91782268585\, 50A-5132
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/Los_Angeles:20181213T160000
DTEND;TZID=America/Los_Angeles:20181213T170000
DTSTAMP:20260413T121534
CREATED:20181107T084221Z
LAST-MODIFIED:20181107T084221Z
UID:948-1544716800-1544720400@rpm.physics.lbl.gov
SUMMARY:Brooke Russell (Yale) "Leveraging LArTPC Technology to Definitively Resolve the MiniBooNE Anomaly - An Elctron Neutrino Appearance Search at MicroBooNE"
DESCRIPTION:ABSTRACT:\nMicroBooNE is a single-phase liquid argon time projection chamber (LArTPC) short-baseline accelerator neutrino experiment located at Fermilab on the Booster neutrino beamline. MicroBooNE’s foremost scientific objective is to address the low energy excess of single shower electromagnetic events seen by the precursor MiniBooNE experiment. Leveraging the fine-grained drifted ionization charge signal from particle interactions\, LArTPCs provide detailed topological and calorimetric information for physics analyses. By capitalizing on the interplay between scintillation light and 3D ionization charge imaging\, a high efficiency\, low background analysis is in development to address MiniBooNE’s anomalous result. The status of this analysis is described.
URL:https://rpm.physics.lbl.gov/event/brooke-russell-yale-tba/
LOCATION:HYBRID 50A-5132 (Sessler Conference Room)\, https://lbnl.zoom.us/j/91782268585\, 50A-5132
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/Los_Angeles:20181220T160000
DTEND;TZID=America/Los_Angeles:20181220T170000
DTSTAMP:20260413T121534
CREATED:20181121T100121Z
LAST-MODIFIED:20181121T100121Z
UID:961-1545321600-1545325200@rpm.physics.lbl.gov
SUMMARY:Sunny Vagnozzi (Stockholm University) "Recent Developments in Neutrino Cosmology"
DESCRIPTION:ABSTRACT:\nA robust detection of neutrino masses is avowedly among the key goals of several upcoming Cosmic Microwave Background (CMB) and Large-Scale Structure (LSS) surveys. In this talk\, I will describe recent progress in neutrino cosmology on three fronts. Firstly\, I will illustrate the wealth of information on the sum of the neutrino masses obtainable from current cosmological probes\, focusing on LSS data. Current upper limits begin favoring the normal neutrino mass ordering\, emphasizing the need to develop statistical tools for quantifying this preference. Next\, I will discuss galaxy bias as a limitation towards fully capitalizing on neutrino information hidden in LSS data\, proposing a method for calibrating the scale-dependent galaxy bias using CMB lensing-galaxy cross-correlations. Moreover\, in massive neutrino cosmologies the bias as usually defined is scale-dependent even on large scales: neglecting this effect will lead to incorrectly inferred parameters. Finally\, I will take on a different angle and discuss degeneracies between neutrinos and other cosmological parameters. I will show how in certain physically motivated dynamical dark energy models the neutrino mass upper limits tighten instead of broadening\, discussing implications for future laboratory determinations of the mass ordering. I will also discuss how neutrino unknowns affect constraints on inflationary models.
URL:https://rpm.physics.lbl.gov/event/sunny-vagnozzi-stockholm-university-recent-developments-in-neutrino-cosmology/
LOCATION:INPA Common Room (50-5026)\, 50-5026
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