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CHARGE SPECTRUM OF HEAVY AND SUPERHEAVY COMPONENTS OF GALACTIC COSMIC RAYS: RESULTS OF THE OLIMPIYA EXPERIMENT

Alexeev, Victor and Bagulya, Alexander and Chernyavsky, Mikhail and Gippius, Alexei and Goncharova, Lyudmila and Gorbunov, Sergei and Gorshenkov, Mikhail and Kalinina, Galina and Konovalova, Nina and Liu, Jie and Zhai, Pengfei and Okatyeva, Natalia and Pavlova, Tatyana and Polukhina, Natalia and Starkov, Nikolai and Soe, Than Naing and Trautmann, Christina and Savchenko, Elena and Shchedrina, Tatyana and Vasiliev, Alexander and Volkov, Alexander (2016):
CHARGE SPECTRUM OF HEAVY AND SUPERHEAVY COMPONENTS OF GALACTIC COSMIC RAYS: RESULTS OF THE OLIMPIYA EXPERIMENT.
In: The Astrophysical Journal, IOP Publishing, p. 120, 829, (2), ISSN 1538-4357, DOI: 10.3847/0004-637X/829/2/120, [Online-Edition: https://doi.org/10.3847/0004-637X/829/2/120],
[Article]

Abstract

The aim of the OLIMPIYA experiment is to search for and identify traces of heavy and superheavy nuclei of galactic cosmic rays (GCR) in olivine crystals from stony–iron meteorites serving as nuclear track detectors. The method is based on layer-by-layer grinding and etching of particle tracks in these crystals. Unlike the techniques of other authors, this annealing-free method uses two parameters: the etching rate along the track (V etch) and the total track length (L), to identify charge Z of a projectile. A series of irradiations with different swift heavy ions at the accelerator facilities of GSI (Darmstadt) and IMP (Lanzhou) were performed in order to determine and calibrate the dependence of projectile charge on V etch and L. To date, one of the most essential results of the experiment is the obtained charge spectrum of GCR nuclei within the range of Z > 40, based on about 11.6 thousand processed tracks. As the result of data processing, 384 nuclei with charges Z ≥ 75 have been identified, including 10 nuclei identified as actinides (90 < Z < 103). Three tracks were identified to be produced by nuclei with charges 113 < Z < 129. Such nuclei may be part of the Island of Stability of transfermium elements.

Item Type: Article
Erschienen: 2016
Creators: Alexeev, Victor and Bagulya, Alexander and Chernyavsky, Mikhail and Gippius, Alexei and Goncharova, Lyudmila and Gorbunov, Sergei and Gorshenkov, Mikhail and Kalinina, Galina and Konovalova, Nina and Liu, Jie and Zhai, Pengfei and Okatyeva, Natalia and Pavlova, Tatyana and Polukhina, Natalia and Starkov, Nikolai and Soe, Than Naing and Trautmann, Christina and Savchenko, Elena and Shchedrina, Tatyana and Vasiliev, Alexander and Volkov, Alexander
Title: CHARGE SPECTRUM OF HEAVY AND SUPERHEAVY COMPONENTS OF GALACTIC COSMIC RAYS: RESULTS OF THE OLIMPIYA EXPERIMENT
Language: German
Abstract:

The aim of the OLIMPIYA experiment is to search for and identify traces of heavy and superheavy nuclei of galactic cosmic rays (GCR) in olivine crystals from stony–iron meteorites serving as nuclear track detectors. The method is based on layer-by-layer grinding and etching of particle tracks in these crystals. Unlike the techniques of other authors, this annealing-free method uses two parameters: the etching rate along the track (V etch) and the total track length (L), to identify charge Z of a projectile. A series of irradiations with different swift heavy ions at the accelerator facilities of GSI (Darmstadt) and IMP (Lanzhou) were performed in order to determine and calibrate the dependence of projectile charge on V etch and L. To date, one of the most essential results of the experiment is the obtained charge spectrum of GCR nuclei within the range of Z > 40, based on about 11.6 thousand processed tracks. As the result of data processing, 384 nuclei with charges Z ≥ 75 have been identified, including 10 nuclei identified as actinides (90 < Z < 103). Three tracks were identified to be produced by nuclei with charges 113 < Z < 129. Such nuclei may be part of the Island of Stability of transfermium elements.

Journal or Publication Title: The Astrophysical Journal
Volume: 829
Number: 2
Publisher: IOP Publishing
Divisions: 11 Department of Materials and Earth Sciences > Material Science > Ion-Beam-Modified Materials
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences
Date Deposited: 29 Dec 2017 09:36
DOI: 10.3847/0004-637X/829/2/120
Official URL: https://doi.org/10.3847/0004-637X/829/2/120
Funders: S.A. Gorbunov and A.E. Volkov acknowledge financial support from the Russian Foundation for Basic Research, Russia (Grants 16-38-00877 and 15-02-02875, respectively).
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