A new limit on the flux of cosmic antihelium

被引：41

作者：

Saeki, T ^{[1
]}

Anraku, K

Orito, S

Ormes, J

Imori, M

Kimbell, B

Makida, Y

Matsumoto, H

Matsunaga, H

Mitchell, J

Motoki, M

Nishimura, J

Nozaki, M

Otoba, M

Sanuki, T

Streitmatter, R

Suzuki, J

Tanaka, K

Ueda, I

Yajima, N

Yamagami, T

Yamamoto, A

Yoshida, T

Yoshimura, K

机构：

[1] Univ Tokyo, Bunkyo Ku, Tokyo 113, Japan

[2] NASA, Goddard Space Flight Ctr, Greenbelt, MD 20771 USA

[3] New Mexico State Univ, Las Cruces, NM 88003 USA

[4] KEK, High Energy Accelerator Res Org, Tsukuba, Ibaraki 305, Japan

[5] Kobe Univ, Kobe, Hyogo 657, Japan

[6] Inst Space & Astronaut Sci, Sagamihara, Kanagawa 229, Japan

来源：

PHYSICS LETTERS B | 1998年 / 422卷 / 1-4期

基金：

美国国家航空航天局;

关键词：

cosmic-ray; antihelium; antimatter; Universe;

D O I：

10.1016/S0370-2693(98)00131-2

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

A very sensitive search for cosmic-ray antihelium was performed using data obtained from three scientific flights of the BESS magnetic rigidity spectrometer. We have not observed any antihelium; this places a model-independent upper limit (95% C.L.) on the antihelium flux of 6 x 10(-4) m(-2)sr(-1)s(-1) at the top of the atmosphere in the rigidity region 1 to 16 GV, after correcting for the estimated interaction loss of antihelium in the air and in the instrument. The corresponding upper limit on the <(He)over bar>/He flux ratio is 3.1 x 10(-6), 30 times more stringent than the limits obtained in similar rigidity regions with magnetic spectrometers previous to BESS. (C) 1998 Published by Elsevier Science B.V.

引用

页码：319 / 324

页数：6

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