987 research outputs found
Review of Solar Neutrino Experiments
This paper reviews the constraints on the solar neutrino mixing parameters
with data collected by the Homestake, SAGE, GALLEX, Kamiokande,
SuperKamiokande, and SNO experiments. An emphasis will be given to the global
solar neutrino analyses in terms of matter-enhanced oscillation of two active
flavors. The results to-date, including both solar model dependent and
independent measurements, indicate that electron neutrinos are changing to
other active types on route to the Earth from the Sun. The total flux of solar
neutrinos is found to be in very good agreement with solar model calculations.
Future measurements will focus on greater accuracy for mixing parameters and on
better sensitivity to low neutrino energies.Comment: Prepared for the XXI International Symposium on Lepton and Photon
Interactions at High Energies, Fermilab, USA, 11-16 August 200
Mastoparan Causes Ca2+ Release from Skeletal Muscle Sarcoplasmic Reticulum through its Binding to a 97 kDa Protein
開始ページ、終了ページ: 冊子体のページ付
Neutrino magnetic moments, flavor mixing, and the SuperKamiokande solar data
We find that magnetic neutrino-electron scattering is unaffected by
oscillations for vacuum mixing of Dirac neutrinos with only diagonal moments
and for Majorana neutrinos with two flavors. For MSW mixing, these cases again
obtain, though the effective moments can depend on the neutrino energy. Thus,
e.g., the magnetic moments measured with from a reactor and
from the Sun could be different. With minimal assumptions, we find a
new limit on using the 825-days SuperKamiokande solar neutrino
data: at 90% CL, comparable to the
existing reactor limit.Comment: 4 pages including two inline figures. New version has 825 days SK
result, some minor revisions. Accepted for Physical Review Letter
Large Extra Dimensions, Sterile neutrinos and Solar Neutrino Data
Solar, atmospheric and LSND neutrino oscillation results require a light
sterile neutrino, , which can exist in the bulk of extra dimensions.
Solar , confined to the brane, can oscillate in the vacuum to the zero
mode of and via successive MSW transitions to Kaluza-Klein states of
. This new way to fit solar data is provided by both low and
intermediate string scale models. From average rates seen in the three types of
solar experiments, the Super-Kamiokande spectrum is predicted with 73%
probability, but dips characteristic of the 0.06 mm extra dimension should be
seen in the SNO spectrum.Comment: 4 pages, 2 figure
A novel variant fibrinogen, deletion of B beta 111Ser in coiled-coil region, affecting fibrin lateral aggregation
ArticleCLINICA CHIMICA ACTA. 365(1-2): 160-167 (2006)journal articl
Solar and atmospheric neutrino oscillations with three flavours
We analyze the solar and the atmospheric neutrino problems in the context of
three flavour neutrino oscillations. We assume a mass hierarchy in the vacuum
mass eigenvalues , but make no approximation
regarding the magnitudes of the mixing angles. We find that there are small but
continuous bands in the parameter space where the constraints imposed by the
current measurements of , and Kamiokande
experiments are satisfied at level. The allowed parameter space
increases dramatically if the error bars are enlarged to . The
electron neutrino survival probability has different energy dependence in
different regions of the parameter space. Measurement of the recoil electron
energy spectrum in detectors that use scattering may distinguish
between some of the allowed regions of parameter space. Finally we use the
results for the parameter space admitted by the solar neutrinos as an input for
the atmospheric neutrino problem and show that there exists a substantial
region of parameter space in which both problems can be solved.Comment: 25 pages plus eight figures. Uses Revtex. Postcript files for figures
sent separately as a uuencoded fil
A new fit to solar neutrino data in models with large extra dimensions
String inspired models with millimeter scale extra dimensions provide a
natural way to understand an ultralight sterile neutrino needed for a
simultaneous explanation of the solar, atmospheric and LSND neutrino
oscillation results. The sterile neutrino is the bulk neutrino ()
postulated to exist in these models, and it becomes ultralight in theories that
prevent the appearance of its direct mass terms. Its Kaluza-Klein (KK) states
then add new oscillation channels for the electron neutrino emitted from the
solar core. We show that successive MSW transitions of solar to the
lower lying KK modes of in conjunction with vacuum oscillations between
the and the zero mode of provide a new way to fit the solar
neutrino data. Using just the average rates from the three types of solar
experiments, we predict the Super-Kamiokande spectrum with 73\% probability,
but dips characteristic of the 0.06 mm extra dimension should be seen in the
SNO spectrum. We discuss both intermediate and low string scale models where
the desired phenomenology can emerge naturally.Comment: 20 pages, contains updated SuperK results and reference
RFSoC-based front-end electronics for pulse detection
Radiation measurement relies on pulse detection, which can be performed using
various configurations of high-speed analog-to-digital converters (ADCs) and
field-programmable gate arrays (FPGAs). For optimal power consumption, design
simplicity, system flexibility, and the availability of DSP slices, we consider
the Radio Frequency System-on-Chip (RFSoC) to be a more suitable option than
traditional setups. To this end, we have developed custom RFSoC-based
electronics and verified its feasibility. The ADCs on RFSoC exhibit a flat
frequency response of 1-125 MHz. The root-mean-square (RMS) noise level is 2.1
ADC without any digital signal processing. The digital signal processing
improves the RMS noise level to 0.8 ADC (input equivalent 40 Vrms). Baseline
correction via digital signal processing can effectively prevent
photomultiplier overshoot after a large pulse. Crosstalk between all channels
is less than -55 dB. The measured data transfer speed can support up to 32 kHz
trigger rates (corresponding to 750 Mbps). Overall, our RFSoC-based electronics
are highly suitable for pulse detection, and after some modifications, they
will be employed in the Kamioka Liquid Scintillator Anti-Neutrino Detector
(KamLAND).Comment: 14 pages, 13 figure
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