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On the Very Local Interstellar Spectra for Helium, Positrons, Antiprotons, Deuteron, and Antideuteron

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Abstract

Very local interstellar spectra (vLIS’s) for protons and total Helium (He) were observed in situ by Voyager 1 below about 340 MeV/\(n\) since it had moved across the heliopause (HP). Together with high precision PAMELA and AMS observations at the Earth, we previously reported on new vLIS calculated from 1 MeV to 100 GeV for protons, electrons, total He, Oxygen, Carbon, and Boron. We now follow this up to report on the vLIS’s for positrons and for the isotopes He-3, He-4, and Deuteron (H-2) by combining computations with the galactic propagation code, GALPROP, and our 3D modulation model for GCRs in the heliosphere as done previously. Similarly, we also have computed updates of the vLIS’s for antiprotons and antideuteron. We assume that the modulation processes between the HP and the Earth for protons and other GCR nuclei are essentially similar, which is also the case for electrons and positrons, except for particle drifts of oppositely charged particles. The procedures followed to obtain these updates are summarized and a compilation of the mentioned vLIS’s is presented.

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ACKNOWLEDGMENTS

We thank the GALPROP developers and their funding bodies for access to and use of the GALPROP WebRun service.

Funding

MDN acknowledges the SA National Research Foundation (NRF) for grant no. 118915 and BAAP for grant no. 120642; VVM acknowledges RFBR-NRF (project no. 19-52-60003) and the Ministry of Science and Higher Education of the Russian Federation (project no. 0723-2020-0040) under the Joint Science and Technology Research Collaboration between SA and Russia. RM acknowledges partial financial support from the INFN grant ‘‘giovani’’ project ASMDM.

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Authors and Affiliations

  1. Centre for Space Research, North-West University, Potchefstroom, South Africa

    D. Bisschoff, O. P. M. Aslam & M. D. Ngobeni

  2. School of Physical & Chemical Sciences, North-West University, Mmabatho, South Africa

    D. Bisschoff & M. D. Ngobeni

  3. National Research Nuclear University MEPhI (Moscow Engineering Physics Institute), Moscow, Russia

    V. V. Mikhailov

  4. Istituto Nazionale di Fisica Nucleare (INFN), Trieste, Italy

    M. Boezio & R. Munini

  5. Institute for Experimental and Applied Physics, CA University in Kiel, Kiel, Germany

    M. S. Potgieter

Authors
  1. D. Bisschoff
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  2. O. P. M. Aslam
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  3. M. D. Ngobeni
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  4. V. V. Mikhailov
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  5. M. Boezio
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  6. R. Munini
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  7. M. S. Potgieter
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Correspondence to M. S. Potgieter.

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Bisschoff, D., Aslam, O.P., Ngobeni, M.D. et al. On the Very Local Interstellar Spectra for Helium, Positrons, Antiprotons, Deuteron, and Antideuteron. Phys. Atom. Nuclei 84, 1121–1127 (2021). https://doi.org/10.1134/S1063778821130068

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