Properties of Cosmic Lithium Isotopes Measured by the Alpha Magnetic Spectrometer

We present the first measurement of cosmic-ray fluxes of Li6 and Li7 isotopes in the rigidity range from 1.9 to 25 GV. The measurements are based on 0.97 million Li6 and 1.04 million Li7 nuclei collected by the Alpha Magnetic Spectrometer on the International Space Station from May 2011 to October 2023. We observe that over the entire rigidity range the Li6 and Li7 fluxes exhibit nearly identical time variations and, above ∼4 GV, the time variations of Li6, Li7, He, Be, B, C, N, and O fluxes are identical. Above ∼7 GV, we find an identical rigidity dependence of the Li6 and Li7 fluxes. This shows that they are both produced by collisions of heavier cosmic-ray nuclei with the interstellar medium and, in particular, excludes the existence of a sizable primary component in the Li7 flux.

Publication Details

Journal
Archive ouverte UNIGE (University of Geneva)
Published
2025-01-01
Primary Topic
Dark Matter and Cosmic Phenomena
Type
article
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article

Properties of Cosmic Lithium Isotopes Measured by the Alpha Magnetic Spectrometer

Archive ouverte UNIGE (University of Geneva)
Dark Matter and Cosmic Phenomena
article

Properties of Cosmic Lithium Isotopes Measured by the Alpha Magnetic Spectrometer

article en

Abstract

We present the first measurement of cosmic-ray fluxes of Li6 and Li7 isotopes in the rigidity range from 1.9 to 25 GV. The measurements are based on 0.97 million Li6 and 1.04 million Li7 nuclei collected by the Alpha Magnetic Spectrometer on the International Space Station from May 2011 to October 2023. We observe that over the entire rigidity range the Li6 and Li7 fluxes exhibit nearly identical time variations and, above ∼4 GV, the time variations of Li6, Li7, He, Be, B, C, N, and O fluxes are identical. Above ∼7 GV, we find an identical rigidity dependence of the Li6 and Li7 fluxes. This shows that they are both produced by collisions of heavier cosmic-ray nuclei with the interstellar medium and, in particular, excludes the existence of a sizable primary component in the Li7 flux.

Archive ouverte UNIGE (University of Geneva)
National Science Foundation, U.S. Department of Energy, National Aeronautics and Space Administration, Shandong University, Türkiye Atom Enerjisi Kurumu, CERN, Strong, Dipartimenti di Eccellenza, Türkiye Enerji, Nükleer ve Maden Araştırma Kurumu, National Natural Science Foundation of China, Academia Sinica, Centro para el Desarrollo Tecnológico Industrial, Chinese Academy of Sciences, Centre National d’Etudes Spatiales, Nederlandse Organisatie voor Wetenschappelijk Onderzoek, Nuclear Safety and Security Commission, China Scholarship Council, Centre National de la Recherche Scientifique, RWTH Aachen University, Fondation Ernst et Lucie Schmidheiny, National Cheng Kung University, Università degli Studi di Perugia, National Science and Technology Council, Marshall Space Flight Center, Fundação para a Ciência e a Tecnologia, European Regional Development Fund, Centro de Investigaciones Energéticas, Medioambientales y Tecnológicas, Agencia Estatal de Investigación, Institute of High Energy Physics, Institut National de Physique Nucléaire et de Physique des Particules, High Energy Physics
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