589 research outputs found
Precision high voltage divider for the KATRIN experiment
The Karlsruhe Tritium Neutrino Experiment (KATRIN) aims to determine the
absolute mass of the electron antineutrino from a precise measurement of the
tritium beta-spectrum near its endpoint at 18.6 keV with a sensitivity of 0.2
eV. KATRIN uses an electrostatic retardation spectrometer of MAC-E filter type
for which it is crucial to monitor high voltages of up to 35 kV with a
precision and long-term stability at the ppm level. Since devices capable of
this precision are not commercially available, a new high voltage divider for
direct voltages of up to 35 kV has been designed, following the new concept of
the standard divider for direct voltages of up to 100 kV developed at the
Physikalisch-Technische Bundesanstalt (PTB). The electrical and mechanical
design of the divider, the screening procedure for the selection of the
precision resistors, and the results of the investigation and calibration at
PTB are reported here. During the latter, uncertainties at the low ppm level
have been deduced for the new divider, thus qualifying it for the precision
measurements of the KATRIN experiment.Comment: 22 pages, 12 figure
Measurement of the reaction \gamma p \TO K^ + \Lambda(1520) at photon energies up to 2.65 GeV
The reaction \gamma p \TO K^+\Lambda(1520) was measured in the energy range
from threshold to 2.65 GeV with the SAPHIR detector at the electron stretcher
facility ELSA in Bonn. The production cross section was
analyzed in the decay modes , , , and
as a function of the photon energy and the squared
four-momentum transfer . While the cross sections for the inclusive
reactions rise steadily with energy, the cross section of the process \gamma p
\TO K^+\Lambda(1520) peaks at a photon energy of about 2.0 GeV, falls off
exponentially with , and shows a slope flattening with increasing photon
energy. The angular distributions in the -channel helicity system indicate
neither a nor a exchange dominance. The interpretation of the
as a molecule is not supported.Comment: 11 pages, 16 figures, 4 table
Light Meson Dynamics Workshop. Mini proceedings
The mini-proceedings of the Light Meson Dynamics Workshop held in Mainz from
February 10th to 12th, 2014, are presented. The web page of the conference,
which contains all talks, can be found at
https://indico.cern.ch/event/287442/overview .Comment: 46 pages, 17 contributions. Editors: W. Gradl, P. Masjuan, M.
Ostrick, and S. Schere
The Impact of New Polarization Data from Bonn, Mainz and Jefferson Laboratory on Multipoles
New data on pion-photoproduction off the proton have been included in the
partial wave analyses Bonn-Gatchina and SAID and in the dynamical
coupled-channel approach J\"ulich-Bonn. All reproduce the recent new data well:
the double polarization data for E, G, H, P and T in
from ELSA, the beam asymmetry for and
from Jefferson Laboratory, and the precise new differential cross section and
beam asymmetry data for from MAMI. The new fit
results for the multipoles are compared with predictions not taking into
account the new data. The mutual agreement is improved considerably but still
far from being perfect
Eta and Etaprime Photoproduction on the Nucleon with the Isobar Model EtaMAID2018
The isobar model EtaMAID has been updated with new and high precision data
for eta and etaprime photoproduction on protons and neutrons from MAMI, ELSA,
GRAAL and CLAS. The background is described in a recently developed Regge-cut
model, and for the resonance part the whole list of nucleon resonances has been
investigated with 21 N* states contributing to eta photoproduction and 12 N*
states contributing to etaprime photoproduction. A new approach is discussed to
avoid double counting in the overlap region of Regge and resonances. A
comparison is done among four newly updated partial waves analyses for
observables and partial waves. Finally, the possibility of a narrow resonance
near W=1900 MeV is discussed, that would be able to explain unexpected energy
and angular dependence of observables in p(gamma,etaprime)p near etaprime
threshold.Comment: 31 pages, 29 figures, replaced with revised versio
Measurement of gamma p --> K+ Lambda and gamma p --> K+ Sigma0 at photon energies up to 2.6 GeV
The reactions gamma p --> K+ Lambda and gamma p --> K+ Sigma0 were measured
in the energy range from threshold up to a photon energy of 2.6 GeV. The data
were taken with the SAPHIR detector at the electron stretcher facility, ELSA.
Results on cross sections and hyperon polarizations are presented as a function
of kaon production angle and photon energy. The total cross section for Lambda
production rises steeply with energy close to threshold, whereas the Sigma0
cross section rises slowly to a maximum at about E_gamma = 1.45 GeV. Cross
sections together with their angular decompositions into Legendre polynomials
suggest contributions from resonance production for both reactions. In general,
the induced polarization of Lambda has negative values in the kaon forward
direction and positive values in the backward direction. The magnitude varies
with energy. The polarization of Sigma0 follows a similar angular and energy
dependence as that of Lambda, but with opposite sign.Comment: 21 pages, 25 figures, submitted to Eur. Phys. J.
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