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Institution

Shonan Institute of Technology

EducationFujisawa, Japan
About: Shonan Institute of Technology is a education organization based out in Fujisawa, Japan. It is known for research contribution in the topics: Air shower & Cosmic ray. The organization has 638 authors who have published 1376 publications receiving 14585 citations. The organization is also known as: Shonan Koka Daigaku.


Papers
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Journal ArticleDOI
TL;DR: Results indicate that defects responsible for these luminescence bands are diamagnetic defects introduced during preparation or paramagnetic species induced during excitation.
Abstract: Photoluminescence under 7.9-eV excimer-laser excitation was measured at room temperature on various types of high-purity silica glasses, which were classified based on the oxygen stoichiometry and OH concentrations. Several luminescence bands with different peak energies from 1.9 to 4.3 eV and decay constants were observed in different types of silicas. The 1.9-eV band was observed in low-OH oxygen-surplus and high-OH silicas. The 2.7-eV band was observed only in low-OH oxygen-deficient silicas. The 3.1- and the 4.2-eV bands were observed in a particular type of silica, which has a characteristic absorption band at 5.1 eV (referred to as the ${\mathit{B}}_{2}$\ensuremath{\beta} band). The 4.3-eV band was observed in all types of silicas but the oxygen-surplus type. These results indicate that defects responsible for these luminescence bands are diamagnetic defects introduced during preparation or paramagnetic species induced during excitation.

369 citations

Journal ArticleDOI
TL;DR: Observation of the decay lifetime of photoluminescence and calculations using the ab initio molecular-orbital program show that the 7.6-eV band is caused by a singlet-to-singlet transition, while the 5.0-ev band is cause by a singslet- to-triplet transition.
Abstract: Various uv and vacuum-uv optical-absorption bands found in as-manufactured high-purity ${\mathrm{SiO}}_{2}$ glass were studied. Two types of absorption bands were found near 5.0 eV, one of which is attributed to the oxygen vacancy (?Si-Si?). The absorption band at 7.6 eV is also found to be caused by the same oxygen vacancy. Observation of the decay lifetime of photoluminescence and calculations using the ab initio molecular-orbital program show that the 7.6-eV band is caused by a singlet-to-singlet transition, while the 5.0-eV band is caused by a singlet-to-triplet transition.

262 citations

Journal ArticleDOI
20 Oct 2006-Science
TL;DR: Two-dimensional high-precision anisotropy measurement for energies from a few to several hundred teraelectronvolts (TeV) is presented, using the large data sample of the Tibet Air Shower Arrays, revealing finer details of the known anisotropies.
Abstract: The intensity of Galactic cosmic rays is nearly isotropic because of the influence of magnetic fields in the Milky Way. Here, we present two-dimensional high-precision anisotropy measurement for energies from a few to several hundred teraelectronvolts (TeV), using the large data sample of the Tibet Air Shower Arrays. Besides revealing finer details of the known anisotropies, a new component of Galactic cosmic ray anisotropy in sidereal time is uncovered around the Cygnus region direction. For cosmic-ray energies up to a few hundred TeV, all components of anisotropies fade away, showing a corotation of Galactic cosmic rays with the local Galactic magnetic environment. These results have broad implications for a comprehensive understanding of cosmic rays, supernovae, magnetic fields, and heliospheric and Galactic dynamic environments.

259 citations

Journal ArticleDOI
TL;DR: In this paper, optical absorption and photoluminescence measurements of the 19eV emission, excited by various excitation bands, were carried out on high-purity silica glasses subjected to γ-ray irradiation.
Abstract: Optical absorption measurements of the 20‐eV band and photoluminescence measurements of the 19‐eV emission, excited by various excitation bands, were carried out on high‐purity silica glasses subjected to γ‐ray irradiation Two, and possibly three, different forms of nonbridging oxygen hole centers were deconvoluted from the results of the isochronal annealing experiments The difference in the peak wavelength of the 20‐eV absorption and 19‐eV luminescence bands among various forms of nonbridging oxygen hole centers is reported

215 citations


Authors

Showing all 639 results

NameH-indexPapersCitations
Isao Ando414708315
Toshiki Makimoto402316433
Makoto Kasu391926327
Masaaki Kobayashi321263435
Mitsuru Ishii29832378
Hisamatsu Nakano281743400
Fan Wu27422445
H. Sugimoto251152268
Yoshitaka Taniyasu24743133
Kazuhide Kumakura241192230
Hirotaka Ono241411865
Akihisa Ohya231521512
Nobuo Matsumoto21741399
Kazutaka Terashima211381612
Kaya Nagasawa20472080
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Performance
Metrics
No. of papers from the Institution in previous years
YearPapers
20232
20221
202133
202047
201940
201845