Isotopic Composition of Light Nuclei in Cosmic Rays: Results from AMS-01

TL;DR

This paper reports measurements of isotopic ratios in cosmic rays using AMS-01, providing insights into cosmic ray propagation and origin, with results spanning energies from 0.2 to 1.4 GeV per nucleon.

Contribution

First measurements of multiple isotopic ratios in cosmic rays using AMS-01 during the 1998 STS-91 mission.

Findings

Measured isotopic ratios 2H/4He, 3He/4He, 6Li/7Li, 7Be/(9Be+10Be), 10B/11B.

Data covers kinetic energies from 0.2 to 1.4 GeV per nucleon.

Provides new constraints on cosmic ray propagation models.

Abstract

The variety of isotopes in cosmic rays allows us to study different aspects of the processes that cosmic rays undergo between the time they are produced and the time of their arrival in the heliosphere. In this paper we present measurements of the isotopic ratios 2H/4He, 3He/4He, 6Li/7Li, 7Be/(9Be+10Be) and 10B/11B in the range 0.2-1.4 GeV of kinetic energy per nucleon. The measurements are based on the data collected by the Alpha Magnetic Spectrometer, AMS-01, during the STS-91 flight in 1998 June.