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X-WR-CALNAME:Erlangen Centre for Astroparticle Physics
X-ORIGINAL-URL:https://ecap.nat.fau.de
X-WR-CALDESC:Events for Erlangen Centre for Astroparticle Physics
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DTSTART:20170326T010000
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DTSTART:20171029T010000
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DTSTART;TZID=Europe/Berlin:20170517T120000
DTEND;TZID=Europe/Berlin:20170517T130000
DTSTAMP:20260505T060953
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SUMMARY:Kathrin Valerius - Status and prospects of direct neutrino mass searches: News from KATRIN and outlook on future projects
DESCRIPTION:Precision measurements of the kinematics of weak decays offer the only model- independent (direct) approach to investigate the absolute neutrino mass scale in a laboratory experiment. \nIn this talk I will review the status of direct neutrino mass searches based on beta decay of tritium and electron capture in 163Ho and give an overview of future experiments. The currently most mature technique relies on the spectroscopy of tritium beta decay near its kinematic endpoint at 18.6 keV. The KArlsruhe TRItium Neutrino experiment (KATRIN) is targeted at improving the sensitivity of this method by an order of magnitude to 200 meV/c2 (90% C.L.). To this end\, KATRIN utilises an ultra-luminous windowless gaseous tritium source and a high-resolution electrostatic spectrometer. In its recent „First Light“ campaign\, KATRIN has successfully inaugurated its full 70-m electron beam line and is now carrying out final commissioning works leading up to the start of tritium measurements. \nAt the same time\, novel approaches studying the electron capture spectrum in 163Ho with cryogenic microcalorimeters (notably\, ECHo\, HOLMES\, and NuMECS)\, or developing innovative techniques for tritium beta spectroscopy using radio-frequency detection of single electrons (Project 8) are gaining momentum. Experiments exploiting these new techniques are currently in the conceptual design and prototype characterisation phases\, with the aim of developing these complementary methods further towards a sub-eV sensitivity on the neutrino mass.
URL:https://ecap.nat.fau.de/index.php/event/seminar-2017-05-17-kathrin-valerius/
LOCATION:ECAP\, room 307\, Erwin-Rommel-Str 1\, Erlangen\, 91058\, Germany
CATEGORIES:Seminar
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DTSTART;TZID=Europe/Berlin:20170510T120000
DTEND;TZID=Europe/Berlin:20170510T130000
DTSTAMP:20260505T060953
CREATED:20170428T093141Z
LAST-MODIFIED:20170428T093141Z
UID:1530-1494417600-1494421200@ecap.nat.fau.de
SUMMARY:Stefan Geißelsöder - Pattern recognition and deep learning
DESCRIPTION:Algorithms from the field of pattern recognition are used throughout industry and academia. In particular machine learning algorithms have become an established technique in modern experimental physics\, for instance for the discrimination between desired measurements and background. In recent years\, the concept of deep learning has gained considerable attention in the machine learning community and beyond\, achieving record breaking performance for a multitude of tasks. This talk introduces some basics of pattern recognition and a few of the most popular approaches in deep learning\, namely convolutional neural networks (CNNs)\, recurrent neural networks and autoencoders. Results of first applications of CNNs for the KM3NeT neutrino telescope are also presented. They have been produced using the Keras framework with TensorFlow\, the open source tool from Google.
URL:https://ecap.nat.fau.de/index.php/event/seminar-2017-05-10-stefan-geisselsoeder/
LOCATION:ECAP\, room 307\, Erwin-Rommel-Str 1\, Erlangen\, 91058\, Germany
CATEGORIES:Seminar
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BEGIN:VEVENT
DTSTART;TZID=Europe/Berlin:20170426T120000
DTEND;TZID=Europe/Berlin:20170426T130000
DTSTAMP:20260505T060953
CREATED:20170419T135305Z
LAST-MODIFIED:20170419T135305Z
UID:1430-1493208000-1493211600@ecap.nat.fau.de
SUMMARY:Abigail Stevens - Comparing origins of low-frequency quasi-periodic oscillations with spectral timing
DESCRIPTION:The light curves of low-mass X-ray binaries show variability on timescales from milliseconds to months. The shorter (sub-second) variability is particularly interesting because it is thought to probe the inner region of the accretion disk and the central compact object. X-ray spectral-timing is a new type of analysis that seeks to investigate how matter behaves in the strong gravitational field around the compact object. Observations suggest that different types of low-frequency quasi-periodic oscillations (QPOs) are associated with different emitting-region geometries (e.g.\, disk-like or jet-like) in the innermost part of the X-ray binary\, that are varying possibly due to general relativistic precession. We developed a technique for phase-resolved spectroscopy of QPOs\, and are applying it to two types of low-frequency QPOs from the black hole X-ray binary GX 339-4. Over a QPO “period”\, we find that the energy spectrum changes not only in normalization\, but also in spectral shape. We can quantify how the spectral shape changes as a function of QPO phase\, and the two different QPOs show markedly different spectral changes. This talk will feature results from this paper\, as well as new preliminary results.
URL:https://ecap.nat.fau.de/index.php/event/seminar-2017-04-26-abigail-stevens/
LOCATION:ECAP\, room 307\, Erwin-Rommel-Str 1\, Erlangen\, 91058\, Germany
CATEGORIES:Seminar
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