The cosmic-ray 3He/4He ratio from 200 MeV per nucleon-1 to 3.7 GeV per nucleon-1

被引：45

作者：

Reimer, O

Menn, W

Hof, M

Simon, M

Davis, AJ

Labrador, AW

Mewaldt, RA

Schindler, SM

Barbier, LM

Christian, ER

Krombel, KE

Mitchell, JW

Ormes, JF

Streitmatter, RE

Golden, RL

Stochaj, SJ

Webber, WR

Rasmussen, IL

机构：

[1] Univ Gesamthsch Siegen, D-57068 Siegen, Germany

[2] CALTECH, Pasadena, CA 91125 USA

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

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

[5] Danish Space Res Inst, DK-2100 Copenhagen, Denmark

来源：

ASTROPHYSICAL JOURNAL | 1998年 / 496卷 / 01期

关键词：

acceleration of particles; balloons; cosmic rays; nuclear reactions; nucleosynthesis; abundances;

D O I：

10.1086/305358

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

The abundances of cosmic-ray helium isotopes between 0.2 and 3.7 GeV nucleon(-1) were measured by the Isotope Matter Antimatter Experiment (IMAX) during a flight from Lynn Lake, Manitoba, Canada on 1992 July 16-17. The IMAX balloon-borne magnetic spectrometer realized a direct measurement of the charge, the velocity, and the rigidity of cosmic rays using plastic scintillators, a high-resolution time-of-flight system, and two silica-aerogel Cerenkov counters in conjunction with a drift chamber/multiwire proportional chamber tracking system. About 75,000 helium isotopes are identified by their mass using the velocity versus magnetic rigidity technique. The measured He-3/He-4 ratios are corrected to the top of the atmosphere, and a comparison with previous data is given. The observed isotopic composition is found to be generally consistent with the predictions of a standard leaky box model of cosmic-ray transport in the Galaxy.

引用

页码：490 / 502

页数：13

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