Cosmic-ray antiproton flux in the energy range form 200 to 600 MeV

被引：73

作者：

Moiseev, A

Yoshimura, K

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

Orito, S

Ormes, J

Saeki, T

Seo, ES

Stochaj, S

Streitmatter, R

Suzuki, J

Tanaka, K

Yajima, N

Yamagami, T

Yamamoto, A

Yoshida, T

机构：

[1] UNIV TOKYO,BUNKYO KU,TOKYO 113,JAPAN

[2] NATL LAB HIGH ENERGY PHYS,KEK,TSUKUBA,IBARAKI 305,JAPAN

[3] NEW MEXICO STATE UNIV,LAS CRUCES,NM 88003

[4] KOBE UNIV,KOBE,HYOGO,JAPAN

[5] INST SPACE & ASTRONAUT SCI,SAGAMIHARA,KANAGAWA 229,JAPAN

[6] UNIV MARYLAND,COLLEGE PK,MD 20742

来源：

ASTROPHYSICAL JOURNAL | 1997年 / 474卷 / 01期

关键词：

balloons; cosmic rays; elementary particles;

D O I：

10.1086/303463

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We have studied the low-energy antiprotons in the cosmic rays by utilizing data obtained by the Balloon-borne Experiment with a Superconducting magnetic rigidity Spectrometer (BESS) flown in 1993 July from Lynn Lake, Manitoba, Canada. A detailed description of the event selection criteria and back-ground corrections is given. Seven antiprotons are found that give an antiproton flux of 6.4(-3.5)(+5.5) x 10(-3)(m(2) sr s GeV)(-1) and an antiproton/proton ratio of 5.2(-2.8)(+4.4) x 10(-6) in the 200-600 MeV energy range. These results are consistent with a secondary origin of low-energy cosmic-ray antiprotons within our uncertainties, but they still require the precise measurement of the spectrum shape below 500 MeV to clarify exactly the model of particle propagation and possible contributions from exotic sources.

引用

页码：479 / 489

页数：11

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