Report/Dissertation / PhD Thesis

PUBDB-2016-06001

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png SOX - Towards the Detection of Sterile Neutrinos in Borexino : Beta Spectrum Modeling, Monte Carlo Development and Sensitivity Studies for the Sterile Neutrino Search in Borexino

Meyer, M. (Corresponding author)Extern* ; Hagner, C. (Thesis advisor)Extern* ; Wonsak, B. S. (Thesis advisor)Extern*

2016
Verlag Deutsches Elektronen-Synchrotron Hamburg

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Please use a persistent id in citations: doi:10.3204/DESY-THESIS-2016-032

Report No.: DESY-THESIS-2016-032

Abstract: Several experiments have reported anomalies in the neutrino sector which might be explained by the existence of a fourth (sterile) neutrino with a squared mass difference of about 1 eV 2 to the other three active neutrinos. The SOX project is part of the experimental program of the Borexino experiment and seeks for a clarification of the observed anomalies. For that purpose an artificial antineutrino source ( 144 Ce− 144 Pr) and possibly neutrino source ( 51 Cr) will be deployed underneath the large low background detector Borexino. The detector pro- vides both energy and vertex resolution to observe a possible oscillation signature within the detector volume. The calculation of the antineutrino spectrum is based on existing theoreti- cal models and was performed within this thesis. The modeling includes several sub-leading corrections particularly such as finite size of the nucleus, screening of the atomic electrons and radiative effects. Related to this work, dedicated Monte Carlo generators have been de- veloped to simulate the inverse beta decay reaction and the (anti)neutrino elastic scattering off electrons. Based on a profile likelihood analysis, the sensitivity to the sterile neutrino search of the SOX project was evaluated. The results obtained from this analysis confirm that the currently allowed parameter regions for sterile neutrinos can be tested at 95% confi- dence level. Finally, an alternative concept for the sterile neutrino search is presented which is based on a cyclotron and a Beryllium target near Borexino (Borexino+IsoDAR).

Note: POF ist korrekt, wurde von -L- überprüft, pdf-A lässt sich nicht erstellen 7.12.16
Note: Universität Hamburg, Diss., 2016

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Contributing Institute(s):

1. Uni Hamburg / Experimentalphysik (UNI/EXP)

Research Program(s):

1. 899 - ohne Topic (POF3-899) (POF3-899)

Experiment(s):

1. No specific instrument

Appears in the scientific report 2016

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Database coverage:

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