Orito S, Maeno T, Matsunaga H, Abe K, Anraku K, Asaoka Y, Fujikawa M, Imori M, Ishino M, Makida Y, Matsui N, Matsumoto H, Mitchell J, Mitsui T, Moiseev A, Motoki M, Nishimura J, Nozaki M, Ormes J, Saeki T, Sanuki T, Sasaki M, Seo ES, Shikaze Y, Sonoda T, Streitmatter R
University of Tokyo, Tokyo 113-0033, Japan.
Phys Rev Lett. 2000 Feb 7;84(6):1078-81. doi: 10.1103/PhysRevLett.84.1078.
The energy spectrum of cosmic-ray antiprotons ( &pmacr;'s) has been measured in the range 0.18-3.56 GeV, based on 458 &pmacr;'s collected by BESS in a recent solar-minimum period. We have detected for the first time a characteristic peak at 2 GeV of &pmacr;'s originating from cosmic-ray interactions with the interstellar gas. The peak spectrum is reproduced by theoretical calculations, implying that the propagation models are basically correct and that different cosmic-ray species undergo a universal propagation. Future BESS data with still higher statistics will allow us to study the solar modulation and the propagation in detail and to search for primary &pmacr; components.
基于贝加尔湖深层电磁量能器（BESS）在最近太阳活动极小期收集到的458个反质子，测量了宇宙射线反质子（$\bar{p}$'s）在0.18 - 3.56 GeV范围内的能谱。我们首次探测到源自宇宙射线与星际气体相互作用的反质子在2 GeV处出现特征峰。理论计算再现了该峰谱，这意味着传播模型基本正确，且不同宇宙射线种类经历普遍传播。未来具有更高统计量的BESS数据将使我们能够详细研究太阳调制和传播，并寻找初级反质子成分。
