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  1. No Access

    Chapter and Conference Paper

    Short Exposure Ages of Meteorites Determined from the Spallogenic 36Ar/38Ar Ratios

    As a result of the decay of 36C1 into 36Ar the 36Ar/38Ar ratio of spallogenic argon in meteorites increases during the first few million years after the onset of the irradiation. Hence, assuming that the effectiv...

    L. E. Nyquist, F. Begemann, J. C. Huneke, P. Signer in Meteorite Research (1969)

  2. No Access

    Chapter and Conference Paper

    Cosmic-Ray Produced Radionuclides in the Barwell and Saint-Séverin Meteorites

    The radionuclides 32P, 36Cl, 37Ar, and 39Ar have been determined in separate mineral phases of the Barwell and Saint-Séverin meteorites. Hence, not only the activities of these isotopes in the bulk sample are kno...

    F. Begemann, R. Rieder, E. Vilcsek, H. Wánke in Meteorite Research (1969)

  3. No Access

    Chapter and Conference Paper

    Content and Isotopic Composition of Carbon in the Light and Dark Portions of Gas-Rich Chondrites

    The total carbon content and its isotopic composition has been determined in the light and dark portions of the gas-rich bronzite chondrites Breitscheid and Pantar. In accordance with previous measurements by ...

    F. Begemann, K. Heinzinger in Meteorite Research (1969)

  4. No Access

    Chapter and Conference Paper

    Chlorine-36 and Argon-39 Production Rates in the Metal of Stone and Stony-Iron Meteorites

    The production rates of 39Ar and 36Cl in the metal phase of a number of stone meteorites (falls only) and stony-iron meteorites (falls and finds) have been measured, making use of a fractional dissolution techniq...

    F. Begemann, E. Vilcsek in Meteorite Research (1969)

  5. No Access

    Chapter and Conference Paper

    39K(n,p)-Produced 39Ar in Chondrites: New Data and Their Interpretation in Terms of Size, Exposure Age and Orbital Elements

    The 39Ar in stone meteorites consists of two components: one produced by high-energy cosmic-ray particles (E≥200 MeV) via spallation reactions, mainly on iron and nickel, and one produced by MeV neutrons via the

    F. Begemann, H. Wänke in Meteorite Research (1969)