92 research outputs found
Everything Under the Sun: A Review of Solar Neutrinos
Solar neutrinos offer a unique opportunity to study the interaction of
neutrinos with matter, a sensitive search for potential new physics effects,
and a probe of solar structure and solar system formation. This paper describes
the broad physics program addressed by solar neutrino studies, presents the
current suite of experiments programs, and describes several potential future
detectors that could address the open questions in this field. This paper is a
summary of a talk presented at the Neutrino 2014 conference in Boston
Cherenkov and Scintillation Light Separation in Organic Liquid Scintillators
The CHErenkov / Scintillation Separation experiment (CHESS) has been used to
demonstrate the separation of Cherenkov and scintillation light in both linear
alkylbenzene (LAB) and LAB with 2g/L of PPO as a fluor (LAB/PPO). This is the
first such demonstration for the more challenging LAB/PPO cocktail and improves
on previous results for LAB. A time resolution of 338 +/- 12 ps FWHM results in
an efficiency for identifying Cherenkov photons in LAB/PPO of 70 +/- 3% and 63
+/- 8% for time- and charge-based separation, respectively, with scintillation
contamination of 36 +/- 5% and 38 +/- 4%. LAB/PPO data is consistent with a
rise time of 0.75 +/- 0.25 ns
White Paper: Measuring the Neutrino Mass Hierarchy
This white paper is a condensation of a report by a committee appointed
jointly by the Nuclear Science and Physics Divisions at Lawrence Berkeley
National Laboratory (LBNL). The goal of this study was to identify the most
promising technique(s) for resolving the neutrino mass hierarchy. For the most
part, we have relied on calculations and simulations presented by the
proponents of the various experiments. We have included evaluations of the
opportunities and challenges for these experiments based on what is available
already in the literature.Comment: White paper prepared for Snowmass-201
Measurement of Proton Light Yield of Water-based Liquid Scintillator
The proton light yield of liquid scintillators is an important property in the context of their use in large-scale neutrino experiments, with direct implications for neutrino-proton scattering measurements and the discrimination of fast neutrons from inverse β-decay coincidence signals. This work presents the first measurement of the proton light yield of a water-based liquid scintillator (WbLS) formulated from 5% linear alkyl benzene (LAB), at energies below 20 MeV, as well as a measurement of the proton light yield of a pure LAB + 2 g/L 2,5-diphenyloxazole (PPO) mixture (LABPPO). The measurements were performed using a double time-of-flight method and a pulsed neutron beam from the 88-Inch Cyclotron at Lawrence Berkeley National Laboratory. The proton light yields were measured relative to that of a 477 keV electron. The relative proton light yield of WbLS was approximately 3.8% lower than that of LABPPO, itself exhibiting a relative proton light yield 15–20% higher than previous measurements of an analogous anoxic sample. The observed quenching is not compatible with the Birks model for either material, but is well described with the addition of Chou’s bimolecular quenching term. © 2023, The Author(s)
Measurement of proton light yield of water-based liquid scintillator
The proton light yield of liquid scintillators is an important property in
the context of their use in large-scale neutrino experiments, with direct
implications for neutrino-proton scattering measurements and the discrimination
of fast neutrons from inverse beta-decay coincidence signals. This work
presents the first measurement of the proton light yield of a water-based
liquid scintillator (WbLS) formulated from 5% linear alkyl benzene (LAB), at
energies below 20 MeV, as well as a measurement of the proton light yield of a
pure LAB + 2 g/L 2,5-diphenyloxazole (PPO) mixture (LABPPO). The measurements
were performed using a double time-of-flight method and a pulsed neutron beam
from the 88-Inch Cyclotron at Lawrence Berkeley National Laboratory. The proton
light yields were measured relative to that of a 477 keV electron. The relative
proton light yield of WbLS was approximately 3.8% lower than that of LABPPO,
itself exhibiting a relative proton light yield higher than previous
measurements of an analogous anoxic sample. The observed quenching is not
compatible with the Birks model for either material, but is well described with
the addition of Chou's bimolecular quenching term.Comment: 14 pages, 11 figure
Discovering the New Standard Model: Fundamental Symmetries and Neutrinos
This White Paper describes recent progress and future opportunities in the
area of fundamental symmetries and neutrinos.Comment: Report of the Fundamental Symmetries and Neutrinos Workshop, August
10-11, 2012, Chicago, I
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