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There are a total of 19 record(s) matching your query.
Sorted by: Date Added To NTRS in Descending order
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Solar noble gases revealed by closed system stepped etching of a metal separate from Fayetteville
Author(s): Murer, CH.; Baur, H.; Signer, P.; Wieler, R.
Abstract: Solar He, Ne, and Ar in a Fe-Ni separate from the chondrite Fayetteville are analyzed by closed system stepped oxidation. We report here data of the first 15 steps comprising 55 percent of the total solar gases. He-4/Ar-36 ...
NASA Center: NASA (non Center Specific)
Publication Year: 1993
Added to NTRS: 2008-06-02
Accession Number: 94N16432; Document ID: 19940011959
A long-term change of the AR/KR/XE fractionation in the solar corpuscular radiation
Author(s): Wieler, R.; Baur, H.; Signer, P.
Abstract: Solar noble gases in an ilmenite separate from breccia 79035 (antiquity greater than 1 Ga) were analyzed by closed system stepped etching (CSSE). All five gases show the familiar two-component structure: first solar-wind ...
NASA Center: NASA (non Center Specific)
Publication Year: 1993
Added to NTRS: 2004-11-03
Accession Number: 94N20875; Document ID: 19940016402
The Complex Exposure History of a Very Large L/LL5 Chondrite Shower: Queen Alexandra Range 90201
Author(s): Welten, K. C.; Nishiizumi, K.; Caffee, M. W.; Hillegonds, D. J.; Leya, I.; Wieler, R.; Mararik, J.
Abstract: Compared to iron meteorites, large stony meteorites (less than 100 kg) are relatively rare. Most large stony meteoroids fragment during atmospheric entry, producing large meteorite showers. Interestingly, many of these large ...
NASA Center: Goddard Space Flight Center
Publication Year: 2004
Added to NTRS: 2004-11-03
Document ID: 20040065966
Cosmic ray records in Antarctic meteorites
Author(s): Vogt, S.; Herpers, U.; Sarafin, R.; Signer, P.; Wieler, R.; Suter, M.; Woelfli, W.
Abstract: The cosmogenic radionuclides Be(10), Al(26), and Mn(53) and noble gases were determined in more than 28 meteorites from Antarctica by nuclear analytical techniques and static mass spectrometry, respectively. The summarized ...
NASA Center: NASA (non Center Specific)
Publication Year: 1986
Added to NTRS: 2004-11-03
Accession Number: 86N28819; Document ID: 19860019347
Studies on cosmogenic nuclides in meteorites with regard to an application as potential depth indicators
Author(s): Sarafin, R.; Herpers, U.; Englert, P.; Wieler, R.; Signer, P.; Bonani, G.; Hofmann, H. J.; Morenzoni, E.; Nessi, M.; Suter, M., et al.
Abstract: Measurements of stable and radioactive spallation products in meteorites allow to investigate their histories, especially with respect to the exposure to galactic cosmic ray particles and the pre-atmospheric size of the ...
NASA Center: NASA (non Center Specific)
Publication Year: 1986
Added to NTRS: 2004-11-03
Accession Number: 86N32366; Document ID: 19860022894
Long-term changes in composition of solar particles implanted in extraterrestrial materials
Author(s): Kerridge, J. F.; Signer, P.; Wieler, R.; Becker, R. H.; Pepin, R. O.
Abstract: Analysis of lunar surface samples for elements implanted therein by solar corpuscular radiation reveals evidence for the following compositional changes over a time period between 1.5 and 3 Gyr: 50-percent decreases in the ...
NASA Center: Johnson Space Center
Publication Year: 1991
Added to NTRS: 2004-11-03
Accession Number: 92A46681; Document ID: 19920064057
Studies of light noble gases in mineral grains from lunar soils: A status report
Author(s): Wieler, R.; Etique, P.; Signer, P.
Abstract: Among the lunar soil constituents, monomineralic grains deserve special attention. Noble gases of carefully prepared mineral separates from lunar bulk soils were studied. The major results and conclusions of these ...
NASA Center: NASA (non Center Specific)
Publication Year: 1986
Added to NTRS: 2004-11-03
Accession Number: 86N28035; Document ID: 19860018563
On the Bur Gheluai H5 chondrite and other meteorites with complex exposure histories
Author(s): Vogt, S. K.; Aylmer, D.; Herzog, G. F.; Wieler, R.; Signer, P.; Pellas, P.; Fieni, C.; Tuniz, C.; Jull, A. J. T.; Fink, D., et al.
Abstract: Isotopic concentrations and track densities measured in 13 samples of the Bur Gheluai meteorite fall are presented. Experimental methods are described and results are presented for isotopic ratios of noble gases and ...
NASA Center: Johnson Space Center
Publication Year: 1993
Added to NTRS: 2004-11-03
Accession Number: 93A39808; Document ID: 19930055811
Cosmogenic rare gases and 10-Be in a cross section of Knyahinya
Author(s): Wieler, R.; Signer, P.; Herpers, U.; Sarafin, R.; Bonani, G.; Hofmann, H. J.; Morenzoni, E.; Nessi, M.; Suter, M.; Woelfli, W.
Abstract: The concentrations of cosmogenic nuclides were studied as a function of shielding on samples from a cross section of the 293 kg main fragment of the L5 chondrite Knyahinya. The stone broke into two nearly symmetrical parts ...
NASA Center: NASA (non Center Specific)
Publication Year: 1986
Added to NTRS: 2004-11-03
Accession Number: 86N32371; Document ID: 19860022899
Nitrogen and noble gases in the 71501 bulk soil and ilmenite as records of the solar wind exposure: Which is correct
Author(s): Signer, P.; Baur, H.; Etique, P.; Wieler, R.
Abstract: The N determination in mg sized mineral separates from lunar soils by static mass spectrometry is an experimental break-through likely to contribute to the deciphering of the records left in the mineral grains by the ...
NASA Center: NASA (non Center Specific)
Publication Year: 1986
Added to NTRS: 2004-11-03
Accession Number: 86N28034; Document ID: 19860018562
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