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@PHDTHESIS{Gttel:862871,
author = {Göttel, Alexandre S.},
othercontributors = {Ludhová, Livia and Stahl, Achim},
title = {{S}olar neutrino detection: {CNO} discovery with {B}orexino
and preparations for success in {JUNO} and {OSIRIS}},
school = {RWTH Aachen University},
type = {Dissertation},
address = {Aachen},
publisher = {RWTH Aachen University},
reportid = {RWTH-2023-00596},
pages = {1 Online-Ressource : Illustrationen, Diagramme},
year = {2022},
note = {Veröffentlicht auf dem Publikationsserver der RWTH Aachen
University 2023; Dissertation, RWTH Aachen University, 2022},
abstract = {The Sun is powered through different fusion processes that
can be grouped in two categories: the $\textit{pp}-chain$
and the CNO cycle. Building a theory of the balance between
gravitational and radiation forces is difficult, not least
because almost all of the information about the Sun can only
be gathered at a surface level. Particle physics however
predicts that the two aforementioned processes emit
different kinds of neutrinos: $\textit{solar$ neutrinos}.
While their elusive nature makes them extremely difficult to
detect, the same property allows them to escape from the
solar core. They are the only direct probe of the solar
core's internal processes and their measurement on Earth
represents a tremendous experimental and theoretical
success. This thesis explores methods related to the
experimental challenges of measuring CNO neutrinos. These
neutrinos constitute less than one percent of the Sun's
neutrino output but their generating process is thought to
be the main source of stellar energy in our universe. The
findings in this thesis led in part to the first
experimental evidence for CNO neutrinos with the Borexino
detector, which was published in Nature. Another part of
this thesis focuses on JUNO's expected sensitivity to solar
neutrinos. JUNO is a very large liquid scintillator
currently under construction in south China and is shown in
this thesis to have the potential for unprecedentedly
precise solar neutrino measurements. These sensitivity
studies are also currently under preparation for
publication. Finally, this thesis encompasses work with the
OSIRIS detector, a pre-detector for JUNO which will make
sure its liquid scintillator doesn't exceed certain levels
of contamination - which could dismantle its sensitivity not
only to its main goal of measuring the neutrino mass
hierarchy with $3\sigma$ in six years, but also severely
hinder its solar neutrino measurements. The first part of
this section is about developing a source calibration
program which will perform all of OSIRIS's calibration
needs: energy reconstruction, vertex reconstruction, charge
reconstruction, and inter-PMT time offsets on a
sub-nano-second scale. It will also be used to monitor
OSIRIS's scintillator for time-dependent changes thus
providing fast feedback. The results presented in this
thesis are also currently being implemented in a paper which
is planned to be published once the first calibration data
has been measured. In the second part of this section,
OSIRIS's sensitivity to its main goal of measuring $^{238}$U
and $^{232}$Th in the liquid scintillator is calculated with
an improved analysis compared to existing ones. The results
on OSIRIS's sensitivity to its main goal and to $^{85}$Kr
were already published in the European Physical Journal C as
part of an overall design and sensitivity review.},
cin = {139720 / 130000},
ddc = {530},
cid = {$I:(DE-82)139720_20160614$ / $I:(DE-82)130000_20140620$},
typ = {PUB:(DE-HGF)11},
doi = {10.18154/RWTH-2023-00596},
url = {https://publications.rwth-aachen.de/record/862871},
}
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