61 research outputs found
STUDY OF ELECTRON ANTI-NEUTRINOS ASSOCIATED WITH GAMMA-RAY BURSTS USING KamLAND
We search for electron anti-neutrinos ([bar over ν][subscript e]) from long- and short-duration gamma-ray bursts (GRBs) using data taken by the Kamioka Liquid Scintillator Anti-Neutrino Detector (KamLAND) from 2002 August to 2013 June. No statistically significant excess over the background level is found. We place the tightest upper limits on [bar over ν][subscript e] fluence from GRBs below 7 MeV and place first constraints on the relation between [bar over ν][subscript e] luminosity and effective temperature
Report of the Topical Group on Wave Dark Matter for Snowmass 2021
There is a strong possibility that the particles making up the dark matter in
the Universe have a mass below 1 eV and in many important situations exhibit a
wave-like behavior. Amongst the candidates the axion stands out as particularly
well motivated but other possibilities such as axion-like particles, light
scalars and light vectors, should be seriously investigated with both
experiments and theory. Discovery of any of these dark matter particles would
be revolutionary. The wave-like nature opens special opportunities to gain
precise information on the particle properties a well as astrophysical
information on dark matter shortly after a first detection. To achieve these
goals requires continued strong support for the next generations of axion
experiments to probe significant axion parameter space this decade and to
realize the vision of a definitive axion search program in the next 20 years.
This needs to be complemented by strong and flexible support for a broad range
of smaller experiments, sensitive to the full variety of wave-like dark matter
candidates. These have their own discovery potential but can also be the test
bed for future larger scale searches. Strong technological support not only
allows for the optimal realization of the current and near future experiments
but new technologies such as quantum measurement and control can also provide
the next evolutionary jump enabling a broader and deeper sensitivity. Finally,
a theory effort ranging from fundamental model building over investigating
phenomenological constraints to the conception of new experimental techniques
is a cornerstone of the current rapid developments in the search for wave-like
dark matter and should be strengthened to have a solid foundation for the
future.Comment: First arXiv version for community feedbac
A SEARCH FOR ELECTRON ANTINEUTRINOS ASSOCIATED WITH GRAVITATIONAL-WAVE EVENTS GW150914 AND GW151226 USING KAMLAND
We present a search, using KamLAND, a kiloton-scale anti-neutrino detector, for low-energy anti-neutrino events that were coincident with the gravitational-wave (GW) events GW150914 and GW151226, and the candidate event LVT151012. We find no inverse beta-decay neutrino events within ±500 s of either GW signal. This non-detection is used to constrain the electron anti-neutrino fluence and the total integrated luminosity of the astrophysical sources.United States. Department of Energy (Grant DE-FG03-00ER41138)United States. Department of Energy (Grant DE-AC02- 05CH11231)United States. Department of Energy (Grant DE-FG02-01ER41166
Light Yield of Perovskite Nanocrystal-Doped Liquid Scintillator
Future generations of liquid scintillator neutrino experiments will require
stably loading tons of candidate isotopes into kiloton-scale detectors,
representing a significant chemical challenge. Nanoparticles containing the
candidate isotopes provide a promising method for this loading. Additionally,
the unique optical properties of nanoparticles can enhance detection and
background discrimination. Perovskite nanocrystals are particularly attractive
due to the reliability of their crystal structure and their easily-scalable
synthesis. We present here the first study of lead-based perovskite
nanocrystals for this application.Comment: 14 pages, 10 figures, submitted for publication in JINST. arXiv admin
note: substantial text overlap with arXiv:1807.0663
The search for low-mass axion dark matter with ABRACADABRA-10cm
Two of the most pressing questions in physics are the microscopic nature of
the dark matter that comprises 84% of the mass in the universe and the absence
of a neutron electric dipole moment. These questions would be resolved by the
existence of a hypothetical particle known as the quantum chromodynamics (QCD)
axion. In this work, we probe the hypothesis that axions constitute dark
matter, using the ABRACADABRA-10cm experiment in a broadband configuration,
with world-leading sensitivity. We find no significant evidence for axions, and
we present 95% upper limits on the axion-photon coupling down to the
world-leading level GeV,
representing one of the most sensitive searches for axions in the 0.41 - 8.27
neV mass range. Our work paves a direct path for future experiments capable of
confirming or excluding the hypothesis that dark matter is a QCD axion in the
mass range motivated by String Theory and Grand Unified Theories.Comment: 17 pages, 12 figure
Design and Implementation of the ABRACADABRA-10 cm Axion Dark Matter Search
The past few years have seen a renewed interest in the search for light
particle dark matter. ABRACADABRA is a new experimental program to search for
axion dark matter over a broad range of masses, eV. ABRACADABRA-10 cm is a small-scale prototype for a
future detector that could be sensitive to QCD axion couplings. In this paper,
we present the details of the design, construction, and data analysis for the
first axion dark matter search with the ABRACADABRA-10 cm detector. We include
a detailed discussion of the statistical techniques used to extract the limit
from the first result with an emphasis on creating a robust statistical footing
for interpreting those limits.Comment: 12 pages, 8 figure
Snowmass 2021 Cross Frontier Report: Dark Matter Complementarity (Extended Version)
The fundamental nature of Dark Matter is a central theme of the Snowmass 2021
process, extending across all frontiers. In the last decade, advances in
detector technology, analysis techniques and theoretical modeling have enabled
a new generation of experiments and searches while broadening the types of
candidates we can pursue. Over the next decade, there is great potential for
discoveries that would transform our understanding of dark matter. In the
following, we outline a road map for discovery developed in collaboration among
the frontiers. A strong portfolio of experiments that delves deep, searches
wide, and harnesses the complementarity between techniques is key to tackling
this complicated problem, requiring expertise, results, and planning from all
Frontiers of the Snowmass 2021 process.Comment: v1 is first draft for community commen
US Cosmic Visions: New Ideas in Dark Matter 2017: Community Report
This white paper summarizes the workshop "U.S. Cosmic Visions: New Ideas in
Dark Matter" held at University of Maryland on March 23-25, 2017.Comment: 102 pages + reference
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