Physics
Scientific paper
Jul 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993metic..28r.429s&link_type=abstract
Meteoritics, vol. 28, no. 3, volume 28, page 429-430
Physics
Cosmic Rays, Cross Section, Nuclear
Scientific paper
Integral excitation functions of the cosmogenic nuclides are the basic requirement for the interpretation of interactions between cosmic ray particles and extraterrestrial and terrestrial matter. Together with the knowledge of primary and secondary particle fields inside an irradiated body, model calculations can be developed to interpret abundances of cosmogenic nuclides in dependencies of the irradiation history of the irradiated body and of the cosmic particle ray itself. The quality of those model calculations depends on the quality of the available cross-section database, which is neither comprehensive nor reliable for the most important nuclides like the long-lived radionuclides (i.e., 10Be, 26Al, 36Cl, 41Ca) and the stable rare gas isotopes. For a systematic investigation in this field of science we carried out several irradiation experiments with protons in the energy region between 45 MeV and 400 MeV at the Paul Scherrer Institut (Villigen, Switzerland) and the Laboratoire Nationale Saturne (Saclay, France) using the stacked foil technique. We included 21 different target elements with Z between 6 and 79 (C, N as Si3N4, O as SiO2, Mg, Al, Si, Ca as CaC2H2O4, Ti, V, Mn as Mn/Ni alloy, Fe, Co, Ni, Cu, Sr as SrF2, Y, Zr, Nb, Rh, Ba as Ba containing glass and Au) in our experiments. The proton fluxes were monitored via the reaction 27Al(p,3p3n)22Na using the evaluated data of [1]. Residual nuclides were measured by X-, gamma-, and after a chemical separation by accelerator mass spectrometry. In order to check the quality of our experimental procedures we included some target elements in our new experiments for which consistent excitation functions have already been determined [2,3,4]. Our new data show excellent agreement with the earlier measurements. We measured cross sections for more than 120 different reactions. Here we report on the results for target elements with Z up to 28. The exsisting database of experimental excitation functions for the production of some radionuclides relevant for cosmic ray interactions with extraterrestrial and terrestrial matter, i.e., 7Be, 10Be, 22Na, 26Al, and 36Cl is discussed in detail. By a comparison of our new cross-section database with theoretical calculations, the ability to predict unknown excitation functions on the basis of equilibrium and preequilibrium reactions (code ALICE) and an internuclear cascade evaporation model (code HETC) is analyzed. The new data are applied to model calculations for the production of long-lived radionuclides by solar cosmic rays in lunar surface materials and in meteorites. Acknowledgment: This work was supported by the Deutsche Forschungsgemeinschaft and by the Swiss National Science Foundation. References: [1] Tobailem J. and de Lassus St. Genies C. H. (1981) CEA-N-1466. [2] Michel R. et al. (1984) JGR, 89, B673-B684. [3] Michel R. et al. (1985) Nucl. Phys., A441, 617-639. [4] Luepke M. et al. (1992) in Nuclear Data for Science and Technology (S. M. Qaim, ed.), 702, Springer Verlag.
Bodemann R.
Dittrich Beate
Gloris M.
Herpers Ulrich
Kubik Philippe
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