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X-WR-CALDESC:Events for INPA
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TZOFFSETFROM:-0800
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DTSTART:20180311T100000
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BEGIN:VEVENT
DTSTART;TZID=America/Los_Angeles:20180112T120000
DTEND;TZID=America/Los_Angeles:20180112T130000
DTSTAMP:20260527T100820
CREATED:20180104T163059Z
LAST-MODIFIED:20180104T163059Z
UID:306-1515758400-1515762000@inpa.lbl.gov
SUMMARY:Hirotaka Ito - Numerical Simulations of Photospheric Emission from Collapsar Jets
DESCRIPTION:We explore the photospheric emission from a relativistic jet breaking out\nfrom a massive stellar envelope based on relativistic hydrodynamical simulations and post- process radiation transfer calculations in three dimensions. It is shown that structures developed within the jet during its propagation have a significant imprint on the resulting emission. Particularly\, we show that the viewing angle dependence of the emission properties caused by the lateral structure naturally reproduces the observed correlation between the peak energy and luminosity (Yonetoku relation). We also show that the emission possesses non-negligible degree of polarization.
URL:https://inpa.lbl.gov/event/hirotaka-ito-numerical-simulations-of-photospheric-emission-from-collapsar-jets/
LOCATION:50A-5132- Sessler\, 50A-5132 Sessler Conference Room\, CA
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BEGIN:VEVENT
DTSTART;TZID=America/Los_Angeles:20180123T120000
DTEND;TZID=America/Los_Angeles:20180123T130000
DTSTAMP:20260527T100820
CREATED:20180119T180752Z
LAST-MODIFIED:20180119T181203Z
UID:317-1516708800-1516712400@inpa.lbl.gov
SUMMARY:Bjoern Lehnert (Carleton University) - Dark Matter Search with DEAP-3600 and the Importance of Rare Nuclear Decay Searches
DESCRIPTION:The DEAP-3600 experiment is searching for dark matter with a single phase liquid argon (LAr) target\, located at SNOLAB. For a background-free exposure of 3000 kg·yr\, the projected sensitivity to the spin-independent WIMP-nucleon cross section at 100 GeV/c2 WIMP mass is 1e-46 cm2. The construction and filling of DEAP-3600 was completed in 2016 and the experiment is currently taken physics data. Recently\, the first results of an initial commissioning data set were presented which could successfully demonstrate the detector performance and resulted in the leading limit on the WIMP-nucleon spin-independent cross section for argon. \nIn the first part of this seminar I will present the DEAP-3600 experiment and its recent results with an emphasis on radioactive backgrounds. In the second part of the seminar I will briefly describe a few recent investigations of rare beta and double beta decay processes such as 36Ar\, 39Ar and 42Ar with DEAP but also other isotopes with gamma-spectroscopy setups. I will illustrate their importance in the context of radioactive backgrounds in other low background experiments and in the context of understanding nuclear structure. Especially the better understanding of nuclear models and their intrinsic parameters is needed to obtain more reliable nuclear matrix elements e.g. for neutrinoless double beta decay processes in order to connect the observed half-life to the the effective Majorana neutrino mass.
URL:https://inpa.lbl.gov/event/bjoern-lehnert-carleton-university-dark-matter-search-with-deap-3600-and-the-importance-of-rare-nuclear-decay-searches/
LOCATION:50A-5132- Sessler\, 50A-5132 Sessler Conference Room\, CA
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BEGIN:VEVENT
DTSTART;TZID=America/Los_Angeles:20180126T120000
DTEND;TZID=America/Los_Angeles:20180126T130000
DTSTAMP:20260527T100820
CREATED:20180119T175958Z
LAST-MODIFIED:20180122T214337Z
UID:312-1516968000-1516971600@inpa.lbl.gov
SUMMARY:Elizabeth Wills (Drexel) - Probing Cosmic Ray Anisotropy in the Northern Hemisphere with Atmospheric Neutrinos
DESCRIPTION:Cosmic Rays have remained an enigma for over a hundred years since their discovery. This talk focuses on a well-measured\, yet similarly elusive feature; an unexplained structure in arrival direction spanning many energies and angular scales. This talk introduces a new way of exploring Cosmic Ray Anisotropy: observation through secondary neutrinos. Studying the cosmic rays’ neutral daughter particles with pointing capabilities\, like neutrinos\, could shed new light. This can be done at two levels; a source which produces cosmic rays must also produce high energy astrophysical neutrinos\, and low energy atmospheric neutrinos are made when the cosmic rays interact with the atmosphere. This analysis focuses on atmospheric neutrinos detected by IceCube\, a Cherenkov detector instrumenting a kilometer cubed of glacial ice at the South Pole. IceCube has studied the anisotropy and its energy dependence in the Southern sky using atmospheric muons.\n\nUsing IceCube and a high-acceptance dataset of atmospheric neutrinos created for this analysis\, we are nearing the sensitivity threshold to observe the phenomenon in atmospheric neutrinos arriving from the Northern Hemisphere. This analysis focuses on energy ranges that correspond to the spatially-consistent lower energy features of the dipole structure. Due to the statistical limitations of the neutrino dataset in comparison to the cosmic ray datasets\, we also introduce new methods for detecting signal along with the standard multipole analysis methods. These include a 1D relative intensity fit to determine the amplitude and phase of the dipole\, and a 2D binned log-likelihood analysis focusing on searching for observed anisotropy maps from the Tibet collaboration. Future hope for the work is to create a single-detector all-sky map of the anisotropy\, minimizing systematical difficulties combining datasets from separate collaborations.
URL:https://inpa.lbl.gov/event/elizabeth-wills-drexel-icecube/
LOCATION:50A-5132- Sessler\, 50A-5132 Sessler Conference Room\, CA
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