抄録
The Tibet air shower array has been in operation since 1999 as Tibet III (22,050m2) with energy threshold of a few TeV. As primary cosmic rays are shielded by the Moon having the finite size of 0.5 degree in diameter, we observe a deficit in cosmic rays called the Moon's shadow with sufficient statistical significance. The center of the Moon's shadow shifts westwardly due to the geomagnetic field. By analyzing this energy-dependent westward displacement carefully, we set an upper limit of about 5% at 90% confidence level on the cosmic-ray antiproton/proton ratio at multi-TeV energies.
本文言語 | English |
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ホスト出版物のタイトル | 29th International Cosmic Ray Conference, ICRC 2005 |
出版社 | Tata Institute of Fundamental Research |
ページ | 45-48 |
ページ数 | 4 |
巻 | 6 |
出版ステータス | Published - 2005 |
イベント | 29th International Cosmic Ray Conference, ICRC 2005 - Pune 継続期間: 2005 8月 3 → 2005 8月 10 |
Other
Other | 29th International Cosmic Ray Conference, ICRC 2005 |
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City | Pune |
Period | 05/8/3 → 05/8/10 |
ASJC Scopus subject areas
- 核物理学および高エネルギー物理学