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On identification of the galactic cosmic-ray nuclear tracks due to Th-U in olivine crystals from meteorites by V.P. Perelygin; S.G. Stetsenko; R. Brandt; P. Vater; R. Dersch; H.J. Crawford; T.J.M. Symons; C. Perron is a Physics and Astronomy article available to read on EtoBox.
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Earlier, in 1980Earlier, in -1987 , during the investigations of fossil tracks in 12 cm3 of olivine crystals from the meteorites MarJalahti and Eagle Station the abundant groups of tracks with lengths of 120-140 ~m, 200-220 pm and also a few tracks with L 350 ~m have been measured. These crystals were annealed at 430"0 during 32 h before etching. The necessary calibrations of olivine crystals with 25 and 70 MeV/N 238U nuclei were carried out at the Bevalac accelerator (LBL, Berkeley) and with 19 NeV/N ~Fo nuclei at UNILAC (GSI, Darmstadt). The subsequent annealing at 430"C during 32 h results in shortening down of 238U nuclei tracks to 230\_+2\_ 5 ~m (MarJalahti olivines) and 220+\_20 pm (Eagle Station olivlnes), which agrees with the data on the 210+\_20 ~m fossil track group within the experimental error bar. annealing of crystals at 450"^C during 32 h provides the shortening down of the Pb tracks to 60-70 Mm, on the z~°U tracks to 120+20 ~m. This can be compared with corresponding fossil track length spectra (the ~ 50-60--~m and -115 pm groups). • ~WORDS Cosmic-ray nuclei; meteorites; olivine crystal etching; calibrations with uranium ions.
Who reads On identification of the galactic cosmic-ray nuclear tracks due to Th-U in olivine crystals from meteorites?
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- Author
- V.P. Perelygin; S.G. Stetsenko; R. Brandt; P. Vater; R. Dersch; H.J. Crawford; T.J.M. Symons; C. Perron
- Publisher
- Elsevier Science; Elsevier ; Elsevier BV (ISSN 1359-0189)
- Published
- 1991
- Language
- EN
- Field
- Physics and Astronomy (Physical Sciences)