タムラ タダヒサ   Tamura Tadahisa
  田村 忠久
   所属   神奈川大学  工学部 物理学教室
    神奈川大学大学院  工学研究科 工学専攻(応用物理学領域)
   職種   教授
言語種別 日本語
発行・発表の年月 2006/08
形態種別 学術雑誌
査読 査読あり
標題 High Energy Electron Observation by Polar Patrol Balloon Flight in Antarctica
執筆形態 共著
掲載誌名 Adv. Polar Upper Atmos. Res.,
巻・号・頁 20,52-56頁
著者・共著者 S.Torii, et al.,
概要 南極周回気球を利用した宇宙線観測装置PPB-BETSを開発した。観測装置はCERN-SPSでのビーム照射実験によって性能評価を行った。その後、昭和基地より放球されて13日間の長期間気球観測を行い、100GeVを超える高エネルギー領域で約5700事象のデータを取得した。このデータを解析して、宇宙線電子のエネルギースペクトルを得た。
We accomplished a balloon observation of the high-energy cosmic-ray electrons in 10-1000GeV to reveal the origin and the acceleration mechanism. The observation was carried out for 13 days at an average altitude of 35km by the Polar Patrol Balloon (PPB) around Antarctica in January 2004. The detector is an imaging calorimeter composed of scintillating-fiber belts and plastic scintillation counters sandwiched between lead plates. The geometrical factor is about 600cm2sr, and the total thickness of lead absorber is 9 radiation lengths. The performance of the detector has been confirmed by a test flight at the Sanriku Balloon Center and by an accelerator beam test using the CERN-SPS (Super Proton Synchrotron at CERN). The new telemetry system using the Iridium satellite, the power system supplied by solar panels and the automatic flight level control operated successfully during the flight. We collected 5.7×103 events over 100GeV, and selected the electron candidates by a preliminary data analysis of the shower images. We report here an outline of both detector and observation, and the first result of the electron energy spectrum over 100GeV obtained by an electronic counter.