Masami Chiba
Tokyo Metropolitan University
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Publication
Featured researches published by Masami Chiba.
Nuclear Instruments & Methods in Physics Research Section A-accelerators Spectrometers Detectors and Associated Equipment | 1999
Masaaki Kobayashi; Y. Usuki; Mitsuru Ishii; N Senguttuvan; K Tanji; Masami Chiba; Kazuhiko Hara; H Takano; Martin Nikl; P Bohacek; S. Baccaro; A. Cecilia; M. Diemoz
Abstract Doping by different trivalent ions (La3+, Lu3+, Gd3+, Y3+, Sc3+) was systematically studied in PbWO4 crystals in the same way, using raw material from the same source. The result was compared with an undoped sample (actually a Pb-rich one) and samples doped with divalent (Cd2+) and pentavalent (Nb5+) ions. All the trivalent ions but Sc3+ gave a significant improvement in transmittance in the short wavelength region (330–450 nm) and in radiation hardness. Among all the tested dopants, Y3+ and Gd3+ showed the best result; these dopants may be worth further studies, since they have another advantage of the segregation coefficient close to unity.
Nuclear Instruments & Methods in Physics Research Section A-accelerators Spectrometers Detectors and Associated Equipment | 2003
Bernardo Adeva; M. Benayoun; A. Benelli; Z. Berka; V. Brekhovskikh; G. Caragheorgheopol; T. Cechak; Masami Chiba; E. Cima; S. Constantinescu; C. Detraz; D. Dreossi; D. Drijard; A. Dudarev; Ioannis Evangelou; M. Ferro-Luzzi; Manuel Gallas; J. Gerndt; R. Giacomich; Paola Gianotti; M. Giardoni; D. Goldin; F. Gomez; A.M. Gorin; O. Gortchakov; C. Guaraldo; M. Hansroul; M. Iliescu; M. Zhabitsky; V. Karpukhin
The DIRAC spectrometer has been commissioned at CERN with the aim of detecting
Physics Letters B | 1987
Hajime Yoshida; Y. Chiba; I. Endo; I. Hayashibara; T. Ohsugi; A. Taketani; R. Tanaka; K. Amako; Y. Arai; Herbert Friedrich Boerner; M. Fukawa; Y. Fukushima; N. Ishihara; J. Kanzaki; T. Kondo; Keisuke Maehata; T. Matsui; S. Odaka; K. Ogawa; T. Ohama; H. Sakamoto; M. Sakuda; J. Shirai; T. Sumiyoshi; F. Suekane; Y. Teramoto; F. Takasaki; T. Tsuboyama; S. Uehara; Yoshinobu Unno
\pi^+ \pi^-
Nuclear Instruments & Methods in Physics Research Section A-accelerators Spectrometers Detectors and Associated Equipment | 1986
Masayuki Murashita; Hitoshi Saitoh; Keijiro Tobimatsu; Masami Chiba; T. Hirose; Fumihiko Takasaki
atoms produced by a 24 GeV/
Journal of Physics G | 2004
Bernardo Adeva; M. Benayoun; A. Benelli; Z. Berka; V. Brekhovskikh; G. Caragheorgheopol; T. Cechak; Masami Chiba; S. Constantinescu; S Costantini; C. Detraz; D. Dreossi; D. Drijard; A. Dudarev; Ioannis Evangelou; M. Ferro-Luzzi; Manuel Gallas; J. Gerndt; R. Giacomich; Paola Gianotti; D. Goldin; F. Gomez; A.M. Gorin; O. Gorchakov; C. Guaraldo; M. Hansroul; R. Hosek; M. Iliescu; N. Kalinina; V. Karpukhin
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Japanese Journal of Applied Physics | 2002
Masatoshi Fujii; Hiromichi Nakahara; Keisuke Sueki; Toshiaki Shirakawa; Masami Chiba; Yasushi Fujimoto; Yoshikazu Hayami; T. Hirose; Michiaki Utsumi; Masaki Hayashi; Takaharu Yokoyama; Satoru Yonekura
high intensity proton beam in thin foil targets. A challenging apparatus is required to cope with the high interaction rates involved, the triggering of pion pairs with very low relative momentum, and the measurement of the latter with resolution around 0.6 MeV/
Japanese Journal of Applied Physics | 1996
Toshiyuki Okugi; Y. Kurihara; Masami Chiba; Akira Endo; Ryousuke Hamatsu; Tachisige Hirose; Tetsurou Kumita; Tunehiko Omori; Yasunori Takeuchi; M. Yoshioka
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Nuclear Physics | 1980
T. Ishii; K. Egawa; S. Kato; T. Miyachi; K. Sugano; K. Toshioka; K. Ukai; Masami Chiba; K. Joh; T. Shinohara; Y. Yoribayashi; Y. Wada
. The general characteristics of the apparatus are explained and each part is described in some detail. The main features of the trigger system, data-acquisition, monitoring and setup performances are also given.
Applied Surface Science | 1997
T. Kumita; Masami Chiba; R. Hamatsu; Masataka Hirose; T. Hirose; H. Iijima; Mitsuhiro Irako; N. Kawasaki; Y. Kurihara; T. Matsumoto; H. Nakabushi; T. Omori; Y. Takeuchi; Masakazu Washio; J. Yang
Abstract The total cross section for the process of the e+e- annihilation into hadrons has been measured at the centre-of-mass energies of 50 GeV and 52 GeV and a search has been made for new heavy quarks. The ratios R = σ(e+e- → hadrons)/σpoint(e+e- → μ+μ-) obtained are 4.4±0.5 at 50 GeV and 4.7±0.3 at 52 GeV, respectively. An additional systematic uncertainty is 10%. From the event shape analysis we found no evidence for a new quark with charge 2 3 e .
Nuclear Instruments and Methods in Physics Research | 1983
Masaaki Kobayashi; Kimio Morimoto; Hajime Yoshida; S. Sugimoto; S. Kobayashi; Masami Chiba; Mitsuru Ishii; Seikichi Akiyama; Hiroyuki Ishibashi
The performance of a barium fluoride (BaF2) scintillator as an electromagnetic shower calorimeter is investigated for electrons in the energy range 0.25–5 GeV. The energy resolution (fwhm) is expressed by 0.098E14 [GeV] and compared with a Monte Carlo simulation. For radiation damage a dose of 1 × 105 Gy (1 Gy (1 Gy = 100 rad) shortens the optical attenuation length to 14%. The deterioration is compared with that of BGO.
