Search for antihelium in the cosmic rays

被引：28

作者：

Golden, RL

Stochaj, SJ

Stephens, SA

Moiseev, AA

Ormes, JF

Streitmatter, RE

Bowen, T

Moats, A

LloydEvans, J

机构：

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

[2] TATA INST FUNDAMENTAL RES,MUMBAI 400005,INDIA

[3] NASA,GODDARD SPACE FLIGHT CTR,GREENBELT,MD 20771

[4] UNIV ARIZONA,DEPT PHYS,TUCSON,AZ 85721

[5] UNIV SOUTHAMPTON,SOUTHAMPTON SZ09 5NH,HANTS,ENGLAND

[6] UNIV MARYLAND,COLLEGE PK,MD 20742

来源：

ASTROPHYSICAL JOURNAL | 1997年 / 479卷 / 02期

关键词：

balloons; cosmic rays;

D O I：

10.1086/303886

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

On 1987 August 22 a balloon flight was conducted using the Goddard Space Flight Center Low-Energy Antiproton configuration of the New Mexico State University balloon-borne magnet spectrometer. The launch site was Prince Albert, Saskatchewan, Canada. The balloon flew at an average atmospheric depth of 4.7 g cm(-2) for more than 22 hr. During this period a sample of 4.2 x 10(4) helium nuclei was gathered. No antihelium candidates were found in this sample. The resultant upper limit for the ratio of antihelium to helium in cosmic rays over the rigidity interval from 1 to 25 GV/c is 9 x 10(-5) at 95% confidence. This limit is below the predicted level, assuming equal matter and antimatter in the extragalactic cosmic rays.

引用

页码：992 / 996

页数：5

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