899 research outputs found
Development of Atmospheric Monitoring System at Akeno Observatory for the Telescope Array Project
We have developed an atmospheric monitoring system for the Telescope Array
experiment at Akeno Observatory. It consists of a Nd:YAG laser with an
alt-azimuth shooting system and a small light receiver. This system is
installed inside an air conditioned weather-proof dome. All parts, including
the dome, laser, shooter, receiver, and optical devices are fully controlled by
a personal computer utilizing the Linux operating system.
It is now operated as a back-scattering LIDAR System. For the Telescope Array
experiment, to estimate energy reliably and to obtain the correct shower
development profile, the light transmittance in the atmosphere needs to be
calibrated with high accuracy.
Based on observational results using this monitoring system, we consider this
LIDAR to be a very powerful technique for Telescope Array experiments. The
details of this system and its atmospheric monitoring technique will be
discussed.Comment: 24 pages, 13 figures(plus 3 gif files), Published in NIM-A Vol.488,
August 200
Gamow-Teller strength distributions for double-beta-decaying nuclei within continuum-QRPA
A version of the pn-continuum-QRPA is outlined and applied to describe the
Gamow-Teller strength distributions for -decaying open-shell
nuclei. The calculation results obtained for the pairs of nuclei Cd-Sn
and Te-Xe are compared with available experimental data.Comment: 8 pages, 3 figures, To appear in the proceedings of "Nucleus-2007:
Fundamental problems of nuclear physics, atomic power engineering and nuclear
technologies" Voronezh, Russia, June 25-29, 200
Rational solutions of the Sasano system of type
We completely classify the rational solutions of the Sasano system of type
The rational solutions are classified to four classes by the
B\"acklund transformation group.Comment: We believe that the result is correct, but is not interestin
The Anisotropy of Cosmic Ray Arrival Direction around 10^18eV
Anisotropy in the arrival directions of cosmic rays around 10^{18}eV is
studied using data from the Akeno 20 km^2 array and the Akeno Giant Air Shower
Array (AGASA), using a total of about 216,000 showers observed over 15 years
above 10^{17}eV. In the first harmonic analysis, we have found significant
anisotropy of 4 % around 10^{18}eV, corresponding to a chance
probability of after taking the number of independent trials
into account. With two dimensional analysis in right ascension and declination,
this anisotropy is interpreted as an excess of showers near the directions of
the Galactic Center and the Cygnus region. This is a clear evidence for the
existence of the galactic cosmic ray up to the energy of 10^{18}eV. Primary
particle which contribute this anisotropy may be proton or neutron.Comment: 4pages, three figures, to appear in Procedings of 26th ICRC(Salt Lake
City
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