scholarly journals A snap shot from the history of cosmic ray research: a Japanese scientist view

2011 ◽  
Vol 212-213 ◽  
pp. 20-25
Author(s):  
Yasushi Muraki
Keyword(s):  
Cosmic Ray ◽  
History Of ◽  
Japanese Scientist

Rare gas studies of the galactic cosmic ray irradiation history of lunar rocks

1972 ◽  
Vol 36 (3) ◽  
pp. 269-301 ◽  
Author(s):  
J.C Huneke ◽  
F.A Podosek ◽  
D.S Burnett ◽  
G.J Wasserburg
Keyword(s):  
Cosmic Ray ◽  
Rare Gas ◽  
Lunar Rocks ◽  
History Of ◽  
Galactic Cosmic Ray

40 Ar— 39 Ar ages and irradiation history of Luna 24 basalts

1980 ◽  
Vol 297 (1428) ◽  
pp. 27-39 ◽  
Keyword(s):  
Solar Wind ◽  
High Temperature ◽  
Production Rate ◽  
Cosmic Ray ◽  
Spectral Information ◽  
Near Surface ◽  
Surface Sample ◽  
History Of ◽  
Impact Events ◽  
The Way

The Luna 24 mission sampled a variety of lithologies in a single core. Two of these lithologies, a metabasalt (24196) and a crushed basalt (24170) have been subjected to 40 Ar- 39 Ar dating experiments to determine if metamorphism significantly post-dated basalt extrusion. The metabasalt exhibited symptoms of both solar wind contamination and 39 Ar recoil; in view of these effects an age may only be defined by making extreme assumptions. High temperature release fractions give an age of 3.36 ± 0.11 Ga, while the cumulate 40 Ar/ 39 Ar ratio gives 3.14 ± 0.16 Ga; both are comparable with the basalt (24170) age and suggest that the metabasalts represent thermally penecontemporaneously metamorphosed flow margins, rather than the products of later impact events. The feldspar from the microgabbro yielded an age of 3.37 ± 0.20 Ga. The ratios of cosmogenic 38 Ar to Ca in pyroxene and feldspar are within error identical, indicating that 38 Ar production from Fe in the pyroxene is small. This is the first definitive use of Fe-produced 38 Ar as a spectral hardness indicator and implies that the microgabbro received much of its cosmic ray exposure at depth in the regolith. By taking account of the dependence of 38 Ar production rate with depth it is inferred that the microgabbro layer was deposited within the last 350-500 Ma. By implication, the regolith layers above the microgabbro at the Luna 24 site are younger. The metabasalt has an identical cosmogenic 38 Ar/Ca ratio; however, because of the decrease of production rate with depth it could have experienced a 20 % pre-exposure before deposition of the microgabbro. Spectral information has also been obtained from a reappraisal of published argon data and indicates a much harder spectrum for a near surface sample. The way in which the Ca- and Fe-produced 38 Ar e follow the broad trend of the instantaneous production profiles suggests that the regolith at the Luna 24 site has been relatively undisturbed for much of the last 300 Ma.

Development and Application of Luminescence to Earth and Planetary Sciences: Some Landmarks

2014 ◽  
Vol 357 ◽  
pp. 217-243
Author(s):  
R.H. Biswas
Keyword(s):  
Numerical Models ◽  
Cosmic Ray ◽  
Time Resolved ◽  
Infrared Stimulated Luminescence ◽  
Accuracy And Precision ◽  
Wide Range ◽  
History Of ◽  
Recent Trends ◽  
User Friendly ◽  
Exposure Ages

Luminescence, mainly thermoluminescence (TL) and optically stimulated luminescence (OSL), has been researched for more than five decades towards its application to earth and planetary sciences. Luminescence production mechanism has been understood through several theoretical studies, like analytical kinetic theory, numerical models along with the experimental results. Instrument development has progressed with aim from user friendly TL/OSL reader dedicated for dating to challenging reader forin-situMartian sediment dating. Since the development of optical dating in 1985, the technique revolutionised the research in earth sciences. And since then to recent, many methodologies have been developed and some are in developing stage using different signals, like, single grain OSL, red TL, time resolved OSL, thermally transferred OSL (TT-OSL), post infrared-infrared stimulated luminescence (pIR-IRSL), violet light stimulated luminescence (VSL), infrared radioluminescence (IRRL), etc. with an objective to improve the accuracy and precision and to extend the dating range. The wide range of application in different environment, e.g. aeolian, fluvial, marine, glacier, soil, volcanic materials, heated materials, shocked materials, meteorites, etc. have made the technique successful to understand the quaternary history of earth and planetary information like terrestrial and cosmic ray exposure ages of meteorite, meteoroid orbit, thermal metamorphism history of meteorite etc. The aim of this present paper is to discuss some landmarks and recent trends in the development and application in these areas. Contents of the Paper

scholarly journals Noble gas record and cosmic-ray exposure history of the new CO3 chondrite Moss--Comparison with Lancé and other CO chondrite falls

2010 ◽  
Vol 45 (8) ◽  
pp. 1380-1391 ◽  
Author(s):  
Rainer BARTOSCHEWITZ ◽  
Ulrich OTT ◽  
Luitgard FRANKE ◽  
Siegfried HERRMANN ◽  
Yukio YAMAMOTO ◽  
...  
Keyword(s):  
Noble Gas ◽  
Cosmic Ray ◽  
History Of ◽  
Exposure History

Mineralogical and chemical composition and cosmic-ray exposure history of two mesosiderites and two iron meteorites

2000 ◽  
Vol 35 (3) ◽  
pp. 617-628 ◽  
Author(s):  
Dario TERRIBILINI ◽  
Otto EUGSTER ◽  
David W. MITTLEFEHLDT ◽  
Larryn W. DIAMOND ◽  
Stephan VOGT ◽  
...  
Keyword(s):  
Chemical Composition ◽  
Cosmic Ray ◽  
Iron Meteorites ◽  
History Of ◽  
Exposure History

scholarly journals Properties of Ices and Grains: An experimental study

1983 ◽  
Vol 6 ◽  
pp. 347-354
Author(s):  
Bertram Dorm
Keyword(s):  
Low Temperatures ◽  
Proton Irradiation ◽  
Cosmic Ray ◽  
Oort Cloud ◽  
The Sun ◽  
Organic Residue ◽  
History Of ◽  
Composition Structure ◽  
Galactic Cosmic Ray ◽  
Complex Organic

AbstractProton irradiation of a variety of ice mixtures were carried out to study the effect of galactic cosmic ray irradiation of comets in the Oort Cloud. Three significant effects were noted (1) production of new molecules; (2) production of a more energetic ice at low temperatures; (3) production of a non-volatile, complex organic residue. These phenomena suggest various effects on new comets approaching the sun including enhanced activity. Experiments on the condensation of silicate grains provide information on the condensation mechanism and properties of grains. Controlled annealing of the amorphous condensates shows how crystallization occurs. Infrared spectra of different stages of crystallization contain features that may identify composition, structure and history of refractory material.

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