OBSERVATION OF COSMIC-RAY ANTIPROTONS AT ENERGIES BELOW 500 MEV

被引：78
|
作者：
YOSHIMURA, K
ORITO, S
UEDA, I
ANRAKU, K
GOLDEN, R
IMORI, M
INABA, S
KIMBELL, B
KIMURA, N
MAKIDA, Y
MATSUMOTO, H
MATSUNAGA, H
MITCHELL, J
MOTOKI, M
NISHIMURA, J
NOZAKI, M
ORMES, J
SAEKI, T
STREITMATTER, R
SUZUKI, J
TANAKA, K
YAJIMA, N
YAMAGAMI, T
YAMAMOTO, A
YOSHIDA, T
机构：
[1] NATL LAB HIGH ENERGY PHYS,TSUKUBA,IBARAKI,JAPAN
[2] NEW MEXICO STATE UNIV,LAS CRUCES,NM 88003
[3] KOBE UNIV,KOBE,HYOGO,JAPAN
[4] NASA,GODDARD SPACE FLIGHT CTR,GREENBELT,MD 20771
[5] INST SPACE & ASTRONAUT SCI,SAGAMIHARA,KANAGAWA 229,JAPAN
来源：
PHYSICAL REVIEW LETTERS | 1995年 / 75卷 / 21期
关键词：
D O I：
10.1103/PhysRevLett.75.3792
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
A search for cosmic-ray antiprotons was performed using a balloon-borne experiment with a superconducting magnetic rigidity spectrometer (BESS). We have detected four antiprotons in the kinetic energy range between 300 and 500 MeV, the first antiprotons to be identified by a direct mass measurement. The corresponding (p) over bar/p flux ratio at the top of the atmosphere is found to be 1.2(-0.65)(+1.0) X 10(-5). No antiprotons were observed in the range between 175 and 300 MeV, resulting in a 90% C.L. upper limit on the flux ratio of 2.9 X 10(-5).
引用
收藏
页码：3792 / 3795
页数：4
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