Mr
Cheng-Hsien Li
(School of Physics and Astronomy, University of Minnesota at Twin Cities)
08/09/2013, 19:30
We present a pedagogical discussion on the time evolution of neutrino wave packet in free space. A common treatment is to keep terms up to quadratic order in the energy expansion so that the Fourier transform can be evaluated analytically via Gaussian integral. This leads to a solution
representing a ”flat” Gaussian distribution with a constant longitudinal width and a spreading transverse...
Dr
Bakhtiyar Ruzybayev
(University of Delaware)
08/09/2013, 19:30
We report on the measurement of the all-particle cosmic ray energy spectrum with the IceTop air shower array in the energy range from 1.58 PeV to 1.26 EeV. The IceTop air shower array is the surface component of the IceCube Neutrino Observatory at the geographical South Pole. The analysis was performed using only information from IceTop. The data used in this work were taken from June 1, 2010...
Anneli Schulz
(DESY)
08/09/2013, 19:30
Poster
Bow shocks of runaway stars were suggested as possible sources of high-energy gamma-ray emission. In addition to the detection at infrared wavelengths, there have recently been claims for detection in X-rays and radio, indicating a spectrally wide non-thermal component. For the first time we systematically analyzed nearly five years of Fermi-LAT data from the regions of 28 bow shock...
Ms
Viviana Gammaldi
(Universidad Complutense Madrid (UCM))
08/09/2013, 19:30
The gamma-ray fluxes observed by the High Energy Stereoscopic System (H.E.S.S.) from the J1745-290 Galactic Center source is well fitted by the secondary photons coming from dark matter (DM) annihilation in particle-antiparticle standard model pairs over a diffuse power-law background. The spectral features of the signal are consistent with different channels: light quarks, electro-weak gauge...
Dr
Stephanie Wissel
(University of California, Los Angeles)
08/09/2013, 19:30
Poster
The ANtarctic Impulsive Transient Antenna (ANITA) is a balloon-borne radiometer sensitive to broadband radiation from neutrinos interacting in ice and cosmic-ray air showers in the 200–1000 MHz range. The third flight of ANITA will achieve improved sensitivity through an upgraded triggering system and larger antenna array enabling the detection of an order of magnitude more ultra-high energy...
Margherita Tenconi
(CSNSM)
08/09/2013, 19:30
Poster
The Luminescent Underground Molybdenum Investigation for NEUtrino mass and nature (LUMINEU), funded by ANR in France, aims at preparing the ground for a next-generation neutrinoless double beta decay experiment employing scintillating bolometers: these devices are in fact very promising tools in rare events search, in terms of efficiency, energy resolution and background control. In...
Mr
Amol Patwardhan
(UC San Diego (Graduate student))
08/09/2013, 19:30
Poster
We present a model where a keV--MeV scale sterile neutrino plays the role of cold dark matter. This is accomplished by having a heavier (GeV--TeV scale) sterile neutrino decay out-of-equilibrium to generate vast amounts of entropy. This process of dilution modifies the number densities and spectra of the lighter neutrino, allowing it to evade existing constraints and behave as cold dark matter.
Mr
Shawn Westerdale
(Princeton University)
08/09/2013, 19:30
In direct WIMP dark matter detection experiments, neutrons from cosmogenic sources and nuclear reactions in detector materials can provide backgrounds indistinguishable from WIMP signals. To reduce this background, an active neutron veto filled with a boron-loaded liquid scintillator is being developed. The scintillator will be pseudocumene, with trimethyl borate as a boron source, and PPO as...
Andrew Renshaw
(UC Irvine)
08/09/2013, 19:30
Poster
The proposed introduction of a soluble gadolinium [Gd] compound into water Cherenkov detectors can result in a high efficiency for the detection of free neutrons capturing on the Gd. The delayed 8 MeV gamma cascades produced by these captures in coincidence with a prompt positron signal serve to uniquely identify electron anti-neutrinos interacting via inverse beta decay. Such coincidence...
Mr
Tenzing Joshi
(University of California Berkeley)
08/09/2013, 19:30
The response of liquid argon, and other low-background detector materials, to low-energy nuclear recoils is important for determining the sensitivity of these materials to light WIMPS and coherent neutrino-nucleus scattering. Using a small prototype dual-phase argon proportional scintillation counter at LLNL we have probed the response of liquid argon to sub-keV electronic recoils using 37Ar...
Ms
Michelle Mesquita de Medeiros
(Federal University of Goias)
08/09/2013, 19:30
The MINOS detectors are used to collect data from the NuMI neutrino beam as well as atmospheric neutrino data. The atmospheric data taken by the Far Detector, located underground at a depth of 2070 meters-water-equivalent and at 735 km from the neutrino production target, is combined with beam data from both Near and Far Detectors to measure the neutrino and antineutrino mixing parameters....
Mr
Lars Mohrmann
(DESY)
08/09/2013, 19:30
Poster
The IceCube Neutrino Observatory is the largest operating experiment searching for astrophysical neutrinos. Situated at the geographical South Pole, IceCube has been completed in 2010 and is entering its phase of discovery now. Several studies that have recently been performed in IceCube show an excess of events at high energies,
indicating the presence of a non-atmospheric component in the...
Ms
Jutta Schnabel
(ECAP Universität Erlangen-Nürnberg)
08/09/2013, 19:30
Poster
The ANTARES Cherenkov detector is optimized for the detection of neutrino-induced muons in the TeV range with the aim to measure astrophysical neutrinos. A search for a diffuse astrophysical neutrino flux was performed on four years of ANTARES data through parameter space scanning and an upper limit is set on the expected muon neutrino flux.
Mr
Kiseki Nakamura
(Kyoto university)
08/09/2013, 19:30
Poster
NEWAGE is a direction sensitive WIMP search experiment using micro pixel chamber. After our first underground measurement at Kamioka (PLB686(2010)11), we constructed new detector. The size of new detector is twice than older one. And its drift-cage is made by PEEK material to reduce radon emanation. Also we constructed the gas circulation system using cooled charcoal to reduce radon gas. We...
Mr
David Girardelli
(Unicamp)
08/09/2013, 19:30
Poster
Taup Abstract
This work aims to propose a possible solution to the Gallium and Reactor Neutrino Problem, which verifies a difference between predictions and observations of neutrino flux originated from nuclear reactors.
Based on non-standard neutrino interactions we could promote an instantaneous neutrino flavor changing at the moment of neutrino creation.
The approach used is based...
Richard Bonventre
(University of Pennsylvania)
08/09/2013, 19:30
Solar neutrino experiments have yet to see directly the transition region
between matter-enhanced and vacuum oscillations. The transition region is
particularly sensitive to models of non-standard neutrino interactions and
propagation. We examine several such non-standard models, which predict a
lower-energy transition region and a flatter survival probability for the 8B
solar neutrinos...
Mr
Kai Loo
(University of Jyvaskyla)
08/09/2013, 19:30
We take this opportunity to advertise what kind of environment and existing infrastructure the Pyhasalmi mine could offer to the field of experimental astroparticle and underground physics. We summarize the status of the current research in the mine i.e. cosmic ray experiment EMMA and discuss the advantages of the mine in context of a large next-generation underground experiment, like LAGUNA-LBNO.
Koun Choi
(Nagoya University)
08/09/2013, 19:30
Poster
Super-Kamiokande can search for dark matter by detecting neutrinos and muons which are produced by WIMP pair annihilations occur inside the Sun. The huge gravity and hydrogen-rich composition of the Sun combined with high sensitivity of Super-Kamiokande for low-energy (few GeV) neutrinos allow us good sensitivity to light (few GeV to few 10 GeV) WIMP dark matter, especially for spin-dependent...
Danielle Speller
(UC Berkeley)
08/09/2013, 19:30
Poster
The Cryogenic Dark Matter Search experiment (CDMS-II) uses ground-based germanium and silicon detectors to search for the scattering of Weakly Interacting Massive Particles (WIMPs), which are among the leading candidates for the dark matter component of the universe. Using the ionization and athermal phonons measured in particle interactions, CDMS-II is able to achieve excellent discrimination...
Mr
Felix Kahlhoefer
(University of Oxford)
08/09/2013, 19:30
Effective operators are a convenient way to parameterise our ignorance of the interactions between Dark Matter (DM) particles and the Standard Model. However, if we want to apply the same effective operator to different processes (e.g. DM production at the LHC and DM direct detection in underground experiments), we need to worry about the large separation of scales. For example, to calculate...
Dr
Clara Cuesta
(University of Washington)
08/09/2013, 19:30
The Majorana experiment proposes to assemble an array of HPGe detectors to search for neutrinoless double-beta decay in ⁷⁶Ge. Neutrinoless double-beta decay searches play a major role in determining the Majorana/Dirac nature of neutrinos, and would have significant implications for our understanding of the nature of neutrinos and matter in general. Initially, Majorana aims to construct a...
Darcy Barron
(UC San Diego)
08/09/2013, 19:30
The POLARBEAR Cosmic Microwave Background (CMB) polarization experiment has been observing since early 2012 from its 17,000 ft site in the Atacama Desert in Northern Chile. Its measurements will characterize the expected CMB polarization due to gravitational lensing by large scale structure, and search for the possible B-mode polarization signature of inflationary gravitational waves. Its 250...
Matteo Palermo
(Max Plank Institut fur Physik, Munich)
08/09/2013, 19:30
The test-facility GALATEA is presented.
GALATEA is a test-stand designed to study the properties of Germanium detectors in detail.
It is a powerful high precision tool to investigate bulk and surface effects in germanium detectors.
A vacuum tank hauses a cooled detector volume and a system of three stages which allow a complete scan of a detector.
At current, a 19-fold segmented Germanium...
Dr
J. Patrick Harding
(Los Alamos National Laboratory)
08/09/2013, 19:30
Several experiments, including Milagro and IceCube, have reported regions in the TeV sky with an excess of cosmic rays. I will discuss the consistency of these cosmic-ray excesses with dark matter annihilations in a nearby subhalo. The dark matter explanation of the TeV cosmic-ray excess naturally explains both its spatial and spectral features. I will show that the dark matter annihilation...
Mr
Roman Hiller
(Karlsruhe Institute of Technology)
08/09/2013, 19:30
Tunka-Rex is a new radio detector for extensive air showers from cosmic rays, built in 2012 as an extension to Tunka-133. The latter is a non-imaging air-Cherenkov detector, located near lake Baikal, Siberia. With its 25 radio antennas, Tunka-Rex extends over 1~km$^2$ with a spacing of 200~m and therefore is expected to be sensitive to an primary energy range of 10$^{17}$-10$^{18}$~eV. Using...
Ms
Katayun Kamdin
(UC Berkeley)
08/09/2013, 19:30
Poster
The SNO+ detector is located in the Creighton Mine near Sudbury, Canada. It reuses the SNO detector for a broad neutrino-physics program, with emphasis on neutrinoless double beta decay. The heart of the SNO+ detector is a 12m-diameter acrylic sphere filled with liquid scintillator and the double beta decay isotope, 130Te. Light is emitted when charged particles pass through the scintillator,...
Rebecca Reesman
(The Ohio State University)
08/09/2013, 19:30
The Extragalactic Background Light (EBL) encompasses the light emitted by stars and other astrophysical objects throughout the history of the Universe. From this we can learn about star formation rate as well as galactic evolutionary traits. As gamma-rays travel from distant blazars they can maximally interact with this background light and create an electron-positron pair. This creates a...
