465 research outputs found
Measurement of Coherent Elastic Neutrino-Nucleus Scattering from reactor antineutrinos
The 96.4 day exposure of a 3 kg ultra-low noise germanium detector to the
high flux of antineutrinos from a power nuclear reactor is described. A very
strong preference () for the presence of a coherent elastic
neutrino-nucleus scattering (CENS) component in the data is found, when
compared to a background-only model. No such effect is visible in 25 days of
operation during reactor outages. The best-fit CENS signal is in good
agreement with expectations based on a recent characterization of germanium
response to sub-keV nuclear recoils. Deviations of order 60\% from the Standard
Model CENS prediction can be excluded using present data. Standing
uncertainties in models of germanium quenching factor, neutrino energy
spectrum, and background are examined.Comment: 6 pages, 5 figures. Data release and additional information in
ancillary file
Redefining genomic privacy: trust and empowerment
Fulfilling the promise of the genetic revolution requires the analysis of large datasets containing information from thousands to millions of participants. However, sharing human genomic data requires protecting subjects from potential harm. Current models rely on de-identification techniques in which privacy versus data utility becomes a zero-sum game. Instead, we propose the use of trust-enabling techniques to create a solution in which researchers and participants both win. To do so we introduce three principles that facilitate trust in genetic research and outline one possible framework built upon those principles. Our hope is that such trust-centric frameworks provide a sustainable solution that reconciles genetic privacy with data sharing and facilitates genetic research
Experimental constraints on a dark matter origin for the DAMA annual modulation effect
A claim for evidence of dark matter interactions in the DAMA experiment has
been recently reinforced. We employ a new type of germanium detector to
conclusively rule out a standard isothermal galactic halo of Weakly Interacting
Massive Particles (WIMPs) as the explanation for the annual modulation effect
leading to the claim. Bounds are similarly imposed on a suggestion that dark
pseudoscalars mightlead to the effect. We describe the sensitivity to light
dark matter particles achievable with our device, in particular to
Next-to-Minimal Supersymmetric Model candidates.Comment: v4: introduces recent results from arXiv:0807.3279 and
arXiv:0807.2926. Sensitivity to pseudoscalars is revised in light of the
first. Discussion on the subject adde
Results from a Search for Light-Mass Dark Matter with a P-type Point Contact Germanium Detector
We report on several features present in the energy spectrum from an ultra
low-noise germanium detector operated at 2,100 m.w.e. By implementing a new
technique able to reject surface events, a number of cosmogenic peaks can be
observed for the first time. We discuss several possible causes for an
irreducible excess of bulk-like events below 3 keVee, including a dark matter
candidate common to the DAMA/LIBRA annual modulation effect, the hint of a
signal in CDMS, and phenomenological predictions. Improved constraints are
placed on a cosmological origin for the DAMA/LIBRA effect.Comment: 4 pages, 4 figures. v2: submitted version. Minimal changes in
wording, one reference adde
Characterization of a photosystem II reaction center complex isolated by exposure of PSII membranes to a non-ionic detergent and high concentrations of NaCl
A highly resolved PSII reaction center complex has been prepared by exposure of PSII membranes to the detergent octylglucopyranoside at elevated ionic strengths; oxygen evolution activity is about 1,000 μmoles O 2 /hr/mg Chl in the presence of CaCl 2 . A Mn quantitation and a kinetic study of Z, the donor to P 680 , reveals that on a Chl basis this new preparation shows an almost four-fold enrichment in Mn and the electron transport components of PSII.Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/43532/1/11120_2004_Article_BF00118314.pd
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