Results from the experimental search for and identification of tracks from the superheavy and transuranium nuclei of galactic cosmic rays in pallacite olivine crystals, conducted as part of project OLIMPIA [1], are presented. To date, 170 crystals from Marjalahti and Eagle Station pallacites have been processed and 6800 tracks corresponding to nuclei with charges Z > 55 have been found; 45 of these are from nuclei with charges of 88 < Z < 92 and three super-long ones were produced by nuclei with Z > 105. The charge of one of these nuclei is estimated in the first approximation as Z = 119(+10,−6). Our data confirm the hypothesis of islands of stability for natural trans-Fermi nuclei.

Thermoluminescence, noble gases, and the tracks of iron-group elements and cosmogenic radionuclides of various half-lives were examined in the fresh-fallen Ash Creek (L6) and Tamdakht (H5) chondrites. The experimental information thus obtained and theoretical simulations were used to study the shock-thermal and exposure histories of the chondrites, to evaluate their preatmospheric sizes and masses, values of ablation, the sizes of their orbits, and to monitor the distribution and variations in cosmic radiation in the heliosphere during the transitional period of minimum between solar cycles 23 and 24.

Citation: Bagulya, A. V., L. A. Goncharova, A. I. Ivliev, G. V. Kalinina, L. L. Kashkarov, N. S. Konovalova, N. M. Okateva, N. G. Polukhina, A. S. Roussetski, N. I. Starkov (2012), Fragmentation of the uranium nuclei in ironnickel pallasite medium: theoretical estimation of the fragment nuclei superposition with the primary galactic cosmic ray nuclus abundance, Vestn. Otd. nauk Zemle, 4, NZ9001, doi:10.2205/2012NZ_ASEMPG

Pallasites are specific stony-iron class of meteorites are mixtures of olivine and Fe-Ni. Olivine is one of the suitable silicate mineral for registration heavy cosmic ray nuclei with help of chemically etched tracks. Five meteorites of this class were selected for study by the track and thermoluminescence (TL) methods: Brenham, Eagle Station, Ilimaes, Marjalahti and Omolon. For measurement of the natural and artificially induced TL it was used high-sensitive TL equipment. The significant difference of the typical glow-curve shapes between pallasites under investigation was determined. The total difference was observed in comparison with TL glow-curves, measured in artificially shocked olivine samples. Note that our TL observations indicate on chief connection with the olivine crystal microstructure and the very low level of possible shock influence recorded in all analysed olivine crystal samples. It was obtained that the shape of the track-density distribution, observed in the Brenham olivine crystals, supports assumption, that this distribution resembles determined irradiated on pre-compaction stage crystals, when the predominant part of tracks represent an addition from the solar cosmic ray VH-nuclei.

In this work performed in frame to OLIMPIYA project [5] there are presented new results of measurement of fluxes and of the spectra of superheavy nuclei composing cosmic rays. The method of detection and analysis of nucleus tracks found in the olivine crystals of meteorites was used. The experiment is based on the combined method including the multistage meteorite etching and nucleus track registration and measurement on completely automated PAVICOM setup [5]. The track parameters such as diameter, length and the etching velocity are investigated. On the first stage of the experiment there was held the calibration procedure for nuclei charge identification using the accelerated nuclei Xe and U. The etching length of nuclei (26

This paper presents experimental results on galactic cosmic ray nuclei in olivine crystals from the Marjalahti and Eagle Station pallasites. The charge spectrum of the nuclei is measured to be in good agreement with the experimental data from the HEAO-3 and ARIEL-6 satellite missions.

The Ash Creek L6 chondrite,formerly known as the West, Texasmeteorite, fell the morning of Feb 15, 2009.In total over 270 stones have beenrecovered; total weight is more than 11 kg.The average weight per stone found is40.69g however without the three largestfinds of 1.7, 1.5, and 1.673 kg the average is22.77g per stone. We have studied the AshCreek chondrite in various aspects includingmeasurements of cosmogenic radionuclideswith different half-lifes (T

METEORITE TRACK DATA: COMPARISON WITH THE SATELLITE APPARATUS MEASURING AND THE SUN AND SOLAR SYSTEM VALUES. A.V. Bagulya , M.S. Vladimirov , L.A. Goncharova , A.I. Ivliev , G.V. Kalinina , L.L. Kashkarov., N.S. Konovalova , N.M. Okat’eva , N.G. Polukhina , A.S. Roussetski , N.I. Starkov . (1) Lebedev Physical Institute, RAS (FIAN) poluhina@sci.lebedev.ru 2 Vernadsky Institute of Geochemistry and Analytical Chemistry, RAS (GEOKHI RUN) leokash@mail.ru

Alexandrov A. B. Bagulya A. V. Vladimirov M. S. Goncharova L. A. Ivliev A. I. Kalinina G. V. Kashkarov L. L. Konovalova N. S. Okat’eva N. M. Polukhina N. G. Roussetski A. S. Starkov N. I. Tsarev V. A. Super Heavy (Z>50) Galactic Cosmic Ray Nuclei Abundance on the Base of the Track Parameters Measuring in the Pallasite Olivine Crystals [#1407] New results of the super-heavy cosmic ray nuclei abundance due to the track in the pallasite olivine in the frame of OLIMPIA project are presented. It was detected near 850 tracks with Z>50 and four corresponding Th-U group.

New results of the measurements performed in the “OLIMPIA” project framework of the relative abundance of superheavy (Z≥50) nuclei in galactic cosmic rays are presented. The method of detection and analysis of nucleus tracks in olivine crystals from the Marjalahti pallasite was based on the combination of the multistage etching of individual crystals and measurement of the track parameters (etchable length and corresponding track-etching rate) on the completely automated PAVICOM setup.

To identify the charge of detected cosmic ray nuclei, it is necessary that the dynamic and geometric parameters of tracks (the etching rate of a nuclear track, as well as the length and the diameter of the track channel) be determined with a high accuracy. Results of the experimental investigations of tracks produced in olivine crystals from the Marjalahti pallasite by accelerated Xe and U nuclei are presented. These investigations were performed as part of the Olimpiya project. It is shown that the etching rate and the fully etched track length are independent of the track orientation relative to the crystallographic symmetry axes of each olivine crystal under investigation.