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The other posters at NeuTel XVI

March 5, 2015

Besides the 17 posters (actually 20, as some of the posts merged the information of more than one poster) of which excerpts have been published on this blog in the last few days, six more are on display at the conference. Below are the abstracts for these posters, with no commentary.

1 – J. Coelho: CHIPS R&D – designing a low-cost water cherenkov detector

The discovery of a relatively large theta_13 mixing angle has spurred significant interest in exploring
CP asymmetry in the lepton sector. Well known degeneracies involving CP violation in long-baseline
experiments are most effectively addressed by measurements in multiple baselines and energies. The CHIPS R&D project is searching for low-cost solutions to build a large Water-Cherenkov detector that will provide complementary neutrino oscillation measurements in both the existing NuMI beam and the proposed beam to a Long-Baseline Neutrino Facility in the US. The latest developments in the CHIPS project will be presented, including results from the CHIPS-M prototype detector deployed in the beginning of August in Northern Minnesota. Deployment of a 10 kt detector is planned for the next two years with observation of electron neutrino appearance by late 2017.

2 – M.Kekic: Meff versus the lightest neutrino mass

Within the framework of low-scale Type I seesaw models with two and three extra sterile neutrinos we evaluate the production of the sterile states in the Early Universe, assuming that they are produced only through non-resonant mixing with the active ones. We explore full parameter space and show that the bounds on the extra radiation coming from both BBN and CMB can severely restrict the mass spectra of the sterile neutrinos. In the model with two sterile neutrinos the mass range 1 eV-100 MeV is highly disfavoured, while in the model with three extra states this restrictions depend on the lightest active neutrino mass. We also studied the impact of the sterile neutrinos on the neutrinoless double beta decay.

3 – M. Meyer : Sox – Neutrino Oscillometry in Borexino

Several observed anomalies in the neutrino sector could be explained by a 4th (sterile) neutrino with a squared mass difference in the order of 1eV² to the other three standard neutrinos. This hypothesis can be tested with an artificial kCi antineutrino (Ce-144/Pr-144) source deployed near or inside a large low background detector like Borexino. The SOX project (short baseline neutrino oscillation with Borexino) aims for the detection of sterile neutrinos and offers the almost unique possibility to observe the characteristic antineutrino oscillation pattern within the detector. The poster will summarize this concept and will show the sensitivities for the possible phases of the experiment. Particular focus will be given to the antineutrino spectrum calculation and Monte Carlo simulation.

4 – L. Vanhoefer: Neutron shielding simulations and muon-induced neutrons

Neutrons can create background in experiments built to search for rare events like neutrinoless
double beta decay. Cosmic ray induced neutrons can activate materials used in the experiment during transportation or storage. Although neutrons can be shielded during storage and
transportation, muons penetrate and can produce neutrons inside the shield.
Cosmic-ray neutrons and muons were simulated with the GEANT4 based framework MaGe to
determine the shielding indices for different materials. The effects of backscattering and angular
distributions will be discussed. The MINIDEX experiment aiming to measure muon-induced neutrons in different target materials will be presented.

5 – B. White: The Majorana demonstrator neutrinoless double-beta decay experiment

The Majorana Collaboration goal is the search for neutrinoless double-beta decay in the isotope Ge-76. Arrays of HPGe detectors will be deployed to serve as both source and detector of the rare decays. The Majorana Demonstrator is a 40kg phase of Ge based neutrinoless double-beta decay experiment located at the Sanford Underground Research Facility in Lead, South Dakota. The goals of the Majorana Demonstrator are to reach the required background level and show scalability in order to progress to a tonne-scale experiment.

6 – B. Buttner: The muon tracking system of the Opera experiment 

The main goal of the OPERA experiment is to detect the oscillation of νμ into ντ. The appearance of a
ντ is identified by the typical decay signature of the short living τ which is created in an CC-interaction
of the ντ in the detector. If νμ interact in the detector they can produce charmed particles which can
mimic the decay signature of the τ. In order to suppress this background it is crucial to identify the
charge of the μ. Therefore a spectrometer with good spatial resolution and robust track reconstruction algorithms is needed. The OPERA detector has a tracking system consisting of drift tubes called Precision Tracker (PT). This poster presents the PT and a robust charge reconstruction algorithm. Also further developments to remove ambiguities in the track reconstruction are shown.

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