CC BY
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20th LOMONOSOV CONFERENCE ON ELEMENTARY PARTICLE PHYSICS _ ASTROPARTICLE PHYSICS _
Latest results of the Alpha Magnetic Spectrometer on the International Space Station
J. Berdugo (AMS Collaboration) E-mail: ajavier.berdugo@ciemat.es
Centro de Investigaciones Energéticas, Medioambientales y Tecnológicas (CIEMAT)
Received February 22, 2022
The Alpha Magnetic Spectrometer (AMS) is a general-purpose high-energy particle detector that was deployed to the International Space Station (ISS) on May 19, 2011 to perform a unique long-duration mission of fundamental physics research from space. Among the scientific goals of AMS are the search for Dark Matter and Antimatter, the study of the propagation of cosmic rays and the exploration of new scientific phenomena that cannot be achieved on ground-based experiments. After ten years of operation in space, AMS has collected more than 180 billion cosmic ray events and provided accurate measurements of electrons, positrons, protons, antiprotons, and nuclei with energies of several TeV during nearly a complete solar cycle.
Keywords: AMS, cosmic ray, astroparticle physics, international space station.
English version: Moscow University Physics Bulletin. 2022. 77, No. 2. Pp. 71-82.
Muon puzzle in cosmic rays
A.A. Petrukhin E-mail: AAPetrukhin@mephi.ru
National Research Nuclear University MEPhI (Moscow Engineering Physics Institute). Moscow, Russia
Received February 22, 2022
Short history and modern status of muon puzzle in cosmic rays of very high energies are described. Possible reasons of muon puzzle appearance are discussed. Some experimental ways of muon puzzle solution are considered. One of them is the measurement of energy characteristics of muons, which give the contribution to the observed excess of muon bundles at very high energies. Preliminary results of measurements of muon bundle energy deposit at large zenith angles are analysed.
Keywords: cosmic rays, muon puzzle, muon..
English version: Moscow University Physics Bulletin. 2022. 77, No. 2. Pp. 83-88.
Status of the CSES-Limadou space mission after three years in flight
Francesco Palma1'2^, Matteo Martucci1'2, Alessandro Sotgiu1'2 (on behalf of the CSES-Limadou Collaboration) E-mail: afrancesco.palma@roma2. infn. it
1 University of Rome «Tor Vergata», V. della Ricerca Scientifica 1, I-00133 Rome, Italy 2INFN-Sezione di Roma «Tor Vergata», V. della Ricerca Scientifica 1, I-00133 Rome, Italy
Received January 9, 2022
The China Seismo-Electromagnetic Satellite (CSES-01), in orbit since February 2, 2018, is the first element of an extended constellation of LEO (Low-Earth Orbit) satellites, dedicated to monitoring perturbations of electromagnetic fields, plasma and charged particle fluxes induced by natural sources and artificial emitters in the near-Earth space. The Limadou Collaboration, which is the Italian branch of the aforementioned mission, designed and built one of the nine payloads on board the satellite, i.e. the High-Energy Particle Detector (HEPD-01). HEPD-01 is optimized to detect electrons (3-100 MeV), protons (30-300 MeV), and light nuclei (up to a few hundreds of MeV) with a high energy resolution and a wide angular acceptance. The very good capabilities in particle identification together with the orbit of CSES-01 make HEPD-01 well suited for measuring galactic particle fluxes and their solar modulation, and also for space weather purposes. In this work, we present some results obtained with HEPD-01 during the first three years in flight, including the observation of the August 2018 geomagnetic storm and the galactic cosmic-ray hydrogen spectra in the 40-250 MeV range.
Keywords: High-Energy Particle Detector, geomagnetic storm, cosmic-ray hydrogen spectra.
English version: Moscow University Physics Bulletin. 2022. 77, No. 2. Pp. 93-96.
