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000034082 084__ $$2WoS$$aGeochemistry & Geophysics
000034082 1001_ $$0P:(DE-HGF)0$$aLeya, I.$$b0
000034082 245__ $$aSimulation of the interaction of galactic cosmic-ray protons with meteoroids : on the production of radionuclides in thick gabbro and iron targets irradiated isotropically with 1.6 GeV protons
000034082 260__ $$aHoboken, NJ$$bWiley-Blackwell$$c2000
000034082 300__ $$a287 - 318
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000034082 440_0 $$010841$$aMeteoritics & Planetary Science$$v35$$x1086-9379
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000034082 520__ $$aThick spherical targets made of gabbro (R = 25 cm) and of steel (R = 10 cm) were irradiated isotropically with 1.6 GeV protons at the Saturne synchrotron at Laboratoire National Saturne (LNS)/CEN Saclay in order to simulate the interaction in space of galactic cosmic-ray (GCR) protons with stony and iron meteoroids. Proton fluences of 1.32 x 10(14) cm(-2) and 2.45 x 10(14) cm(-2) were received by the gabbro and iron sphere, respectively, which corresponds to cosmic-ray exposure ages of about 1.6 and 3.0 Ma. Both artificial meteoroids contained large numbers of high-purity target foils of up to 28 elements at different depths. In these individual target foils, elementary production rates of radionuclides and rare gas isotopes were measured by x- and gamma-spectrometry, by low-level counting, accelerator mass spectrometry (AMS), and by conventional rare gas mass spectrometry. Also samples of the gabbro itself were analyzed. Up to now, for each of the experiments, similar to 500 target-product combinations were investigated of which the results for radionuclides are presented here. The experimental production rates show a wide range of depth profiles reflecting the differences between low-, medium-, and high-energy products. The influence of the stony and iron matrices on the production of secondary particles and on particle transport, in general, and consequently on the production rates is clearly exhibited by the phenomenology of the production rates as well as by a detailed theoretical analysis. Theoretical production rates were calculated in an a priori way by folding depth-dependent spectra of primary and secondary protons and secondary neutrons calculated by Monte Carlo techniques with the excitation functions of the underlying nuclear reactions. Discrepancies of up to a factor of 2 between the experimental and a priori calculated depth profiles are attributed to the poor quality of the mostly theoretical neutron excitation functions. Improved neutron excitation functions were obtained by least-squares deconvolution techniques from experimental thick-target production rates of up to five thick-target experiments in which isotropic irradiations were performed. A posteriori calculations using the adjusted neutron cross sections describe the measured depth profiles of all these simulation experiments within 9%. The thus validated model calculations provide a basis for reliable physical model calculations of the production rates of cosmogenic nuclides in stony and iron meteorites as well as in lunar samples and terrestrial materials.
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000034082 7001_ $$0P:(DE-HGF)0$$aLange, H.-J.$$b1
000034082 7001_ $$0P:(DE-HGF)0$$aLüpke, M.$$b2
000034082 7001_ $$0P:(DE-HGF)0$$aNeupert, U.$$b3
000034082 7001_ $$0P:(DE-HGF)0$$aDaunke, R.$$b4
000034082 7001_ $$0P:(DE-HGF)0$$aFanenbruck, O.$$b5
000034082 7001_ $$0P:(DE-HGF)0$$aMichel, R.$$b6
000034082 7001_ $$0P:(DE-HGF)0$$aRösel, R.$$b7
000034082 7001_ $$0P:(DE-HGF)0$$aMeltzow, B.$$b8
000034082 7001_ $$0P:(DE-HGF)0$$aSchiekel, T.$$b9
000034082 7001_ $$0P:(DE-HGF)0$$aSudbrock, F.$$b10
000034082 7001_ $$0P:(DE-HGF)0$$aHerpers, U.$$b11
000034082 7001_ $$0P:(DE-Juel1)VDB384$$aFilges, D.$$b12$$uFZJ
000034082 7001_ $$0P:(DE-HGF)0$$aBonani, G.$$b13
000034082 7001_ $$0P:(DE-HGF)0$$aDittrich-Hannen, B.$$b14
000034082 7001_ $$0P:(DE-HGF)0$$aSuter, M.$$b15
000034082 7001_ $$0P:(DE-HGF)0$$aKubik, P. W.$$b16
000034082 7001_ $$0P:(DE-HGF)0$$aSynal, H.-A.$$b17
000034082 773__ $$0PERI:(DE-600)2011097-2$$gVol. 35, p. 287 - 318$$p287 - 318$$q35<287 - 318$$tMeteoritics & planetary science$$v35$$x1086-9379$$y2000
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000034082 9201_ $$0I:(DE-Juel1)VDB301$$d31.12.2000$$gIKP$$kIKP$$lInstitut für Kernphysik$$x0
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