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

页码：3792 / 3795

页数：4

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