22,100 research outputs found
Prospects for Measurement of the Neutrino Mass Hierarchy
The unknown neutrino mass hierarchy -- whether the mass eigenstate is
the heaviest or the lightest -- represents a major gap in our knowledge of
neutrino properties. Determining the hierarchy is a critical step toward
further precision measurements in the neutrino sector. The hierarchy is also
central to interpreting the next generation of neutrinoless double beta decay
results, plays a role in numerous cosmological and astrophysical questions, and
serves as a powerful model discriminant for theories of neutrino mass
generation and unification. Various current and planned experiments claim
sensitivity for establishing the neutrino mass hierarchy. We review the most
promising of these here, paying special attention to points of concern and
consolidating the projected sensitivities into an outlook for the years ahead.Comment: Uploading final version. 13 pages, 7 figure
Library Event Matching event classification algorithm for electron neutrino interactions in the NOvA detectors
We describe the Library Event Matching classification algorithm implemented
for use in the NOvA oscillation measurement.
Library Event Matching, developed in a different form by the earlier MINOS
experiment, is a powerful approach in which input trial events are compared to
a large library of simulated events to find those that best match the input
event. A key feature of the algorithm is that the comparisons are based on all
the information available in the event, as opposed to higher-level derived
quantities. The final event classifier is formed by examining the details of
the best-matched library events. We discuss the concept, definition,
optimization, and broader applications of the algorithm as implemented here.
Library Event Matching is well-suited to the monolithic, segmented detectors of
NOvA and thus provides a powerful technique for event discrimination.Comment: 10 pages, 7 figures. Minor fixe
Process characteristics and design methods for a 300 deg quad OP amp
The results of process characterization, circuit design, and reliability studies for the development of a quad OP amplifier intended for use up to 300 C are presented. A dielectrically isolated complementary vertical bipolar process was chosen to fabricate the amplifier in order to eliminate isolation leakage and the possibility of latch up. Characterization of NPN and PNP junctions showed them to be suitable for use up to 300 C. Interconnect reliability was predicted to be greater than four years mean time between failure. Parasitic MOS formation was eliminated by isolation of each device
New electrical plethysmograph monitors cardiac output
Four-electrode impedance plethysmograph measures ventricular stroke volume of cardiac output of humans. The instrument is automatic, operates with only one recording channel, and minimizes patient discomfort
Radial honeycomb core
Core alleviates many limitations of conventional nacelle construction methods. Radical core, made of metals or nonmetals, is fabricated either by joining nodes and then expanding, or by performing each layer and then joining nodes. Core may also be produced from ribbons or strips with joined nodes or ribbons oriented in longitudinal planes
Search for Lorentz Invariance and CPT Violation with the MINOS Far Detector
We searched for a sidereal modulation in the MINOS far detector neutrino rate. Such a signal would be
a consequence of Lorentz and CPT violation as described by the standard-model extension framework. It
also would be the first detection of a perturbative effect to conventional neutrino mass oscillations. We
found no evidence for this sidereal signature, and the upper limits placed on the magnitudes of the Lorentz
and CPT violating coefficients describing the theory are an improvement by factors of 20–510 over the
current best limits found by using the MINOS near detector
Improved Measurement of Muon Antineutrino Disappearance in MINOS
We report an improved measurement of ν̅_μ disappearance over a distance of 735 km using the MINOS detectors and the Fermilab Main Injector neutrino beam in a ν̅_μ-enhanced configuration. From a total exposure of 2.95×10^20 protons on target, of which 42% have not been previously analyzed, we make the most precise measurement of Δm̅^2=[2.62_(-0.28)^(+0.31)(stat)±0.09(syst)]×10^(-3)  eV^2 and constrain the ν_μ mixing angle sin^(2)(2θ̅)>0.75 (90% C.L.). These values are in agreement with Δm^2 and sin^(2)(2θ) measured for νμ, removing the tension reported in [ P. Adamson et al. Phys. Rev. Lett. 107 021801 (2011)]
The Dwarf Nova PQ Andromedae
We report a photometric study of the WZ Sagittae-type dwarf nova PQ
Andromedae. The light curve shows strong (0.05 mag full amplitude) signals with
periods of 1263(1) and 634(1) s, and a likely double-humped signal with
P=80.6(2) min. We interpret the first two as nonradial pulsation periods of the
underlying white dwarf, and the last as the orbital period of the underlying
binary. We estimate a distance of 150(50) pc from proper motions and the two
standard candles available: the white dwarf and the dwarf-nova outburst. At
this distance, the K magnitude implies that the secondary is probably fainter
than any star on the main sequence -- indicating a mass below the Kumar limit
at 0.075 M_sol. PQ And may be another "period bouncer", where evolution now
drives the binary out to longer period.Comment: PDF, 13 pages, 2 figures; accepted, in press, to appear September
2005, PASP; more info at http://cba.phys.columbia.edu
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