Cosmogenic isotopes in the lunar soil: solar activity and nearby Supernova outbreak

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Abstract

The lunar soil is an integral detector of cosmic rays (CRs) of different origin (Solar and Galactic). Analysis of the deep profiles of cosmogenic isotopes (14C, 41Ca, 36Cl, 10Be, 26Al, 53Mn) allows us to restore the intensity of CR on time scales of 3–4 half-lives of the corresponding isotope. To coordinate data on 10Be, it is required (in addition to the average flux of CRs) the presence of an additional source of accelerated particles with hard spectrum. Such a source can be, for example, an outbreak of a nearby SN 2–3 million years ago.

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About the authors

G. I. Vasilyev

Ioffe Physical-Technical Institute of the Russian Academy of Sciences

Author for correspondence.
Email: gennadyivas@gmail.com
Russian Federation, Saint Petersburg

A. N. Konstantinov

Peter the Great Saint Petersburg Polytechnic University

Email: gennadyivas@gmail.com
Russian Federation, Saint Petersburg

V. M. Ostryakov

Peter the Great Saint Petersburg Polytechnic University

Email: gennadyivas@gmail.com
Russian Federation, Saint Petersburg

A. K. Pavlov

Ioffe Physical-Technical Institute of the Russian Academy of Sciences

Email: gennadyivas@gmail.com
Russian Federation, Saint Petersburg

D. A. Frolov

Ioffe Physical-Technical Institute of the Russian Academy of Sciences

Email: gennadyivas@gmail.com
Russian Federation, Saint Petersburg

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2. Fig. 1. Depth profiles of induced activity (A, number of decays per min. per kg) of 10Be: points - experimental data [1], 1 - from GCR, 2 - from supernova outburst, 3 - total amount

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3. Fig. 2. Depth profiles of induced activity (A, number of decays per min per kg) of 53Mn: points - experimental data [2], 1 - from GCR, 2 - from supernova outburst, 3 - total amount

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