7 research outputs found
Detecting the Upturn of the Solar B Neutrino Spectrum with LENA
LENA (Low Energy Neutrino Astronomy) has been proposed as a next generation
50 kt liquid scintillator detector. The large target mass allows a high
precision measurement of the solar B neutrino spectrum, with an
unprecedented energy threshold of 2 MeV. Hence, it can probe the MSW-LMA
prediction for the electron neutrino survival probability in the transition
region between vacuum and matter-dominated neutrino oscillations. Based on
Monte Carlo simulations of the solar neutrino and the corresponding background
spectra, it was found that the predicted upturn of the solar B neutrino
spectrum can be detected with 5 sigma significance after 5 y
Emergence of superconductivity in the canonical heavy-electron metal YbRh2Si2
We report magnetic and calorimetric measurements down to T = 1 mK on the
canonical heavy-electron metal YbRh2Si2. The data reveal the development of
nuclear antiferromagnetic order slightly above 2 mK. The latter weakens the
primary electronic antiferromagnetism, thereby paving the way for
heavy-electron superconductivity below Tc = 2 mK. Our results demonstrate that
superconductivity driven by quantum criticality is a general phenomenon.Comment: 39 pages including Supplementary Materials. Version before
copy-edited by the journa
Search for modulations of the solar Be-7 flux in the next-generation neutrino observatory LENA
A next-generation liquid-scintillator detector will be able to perform
high-statistics measurements of the solar neutrino flux. In LENA, solar Be-7
neutrinos are expected to cause 1.7x10^4 electron recoil events per day in a
fiducial volume of 35 kilotons. Based on this signal, a search for periodic
modulations on sub-percent level can be conducted, surpassing the sensitivity
of current detectors by at least a factor of 20. The range of accessible
periods reaches from several minutes, corresponding to modulations induced by
helioseismic g-modes, to tens of years, allowing to study long-term changes in
solar fusion rates.Comment: 15 pages, 9 figure
The next-generation liquid-scintillator neutrino observatory LENA
We propose the liquid-scintillator detector LENA (Low Energy Neutrino
Astronomy) as a next-generation neutrino observatory on the scale of 50 kt. The
outstanding successes of the Borexino and KamLAND experiments demonstrate the
large potential of liquid-scintillator detectors in low-energy neutrino
physics. LENA's physics objectives comprise the observation of astrophysical
and terrestrial neutrino sources as well as the investigation of neutrino
oscillations. In the GeV energy range, the search for proton decay and
long-baseline neutrino oscillation experiments complement the low-energy
program. Based on the considerable expertise present in European and
international research groups, the technical design is sufficiently mature to
allow for an early start of detector realization.Comment: Whitepaper for the LENA low-energy neutrino detector, 67 pages, 32
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