Krypton Production Cross Sections and Production Rates in Simulation Experiments

Details Krypton Production Cross Sections and Production Rates in Simulation Experiments Krypton Production Cross Sections and Production Rates in Simulation Experiments

Sep 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995metic..30q.510g&link_type=abstract

Meteoritics, vol. 30, no. 5, page 510

Other

2

Cross-Section, Isotopes, Cosmogenic, Krypton, Meteroids, Simulations

Scientific paper

The stacked-foil technique was used to measured proton induced excitation functions from Sr targets (SrF2). The irradiations were performed at the Laboratoire National Saturne in Saclay (F), the Svedberg Laboratory in Uppsala (S) and the Paul Scherrer Institute in Villigen (CH) with primary energies from 45 to 400 MeV. After gamma-spectrometric measurement of short and medium-lived radionuclides and after sufficient cooling, stable and long lived Kr isotopes were measured at Centre Etude Nucleaire in Bordeaux (F). Deduced cross sections were corrected for the production of secondary protons and neutrons by a method developed by Lupke[1]. There are no literature data which can be compared with the cross sections from this work. Theoretical calculations of cross sections were performed using two approaches. The first one was using the hybrid model of preequilibrium reactions with the code AREL[2]. The second was using the Intra-Nuclear-Cascade/Evaporation model in the form of the High Energy Transport Code (HETC)[3]. This study shows that for energies above 200 MeV, the spallation model is better suited to explain the nuclear reactions whereas the preequilibrium model leads to underestimation of the experimental data. For energies above 200 MeV, HETC should be preferred to AREL calculations. In physical models describing galactic cosmic ray (GCR) interactions with matter [4], cross sections of both, proton and neutron-induced reactions, are important parameters. Using the measured cross sections for proton-induced reactions from this work and the experimental Kr depth profiles obtained from Sr targets in the LNS172 simulation experiment [5], we established a set of excitation functions for neutron-induced reactions, which now excellently describes the production rate depth profiles from the simulation experiment. Before measuring experimental cross sections for Kr from Sr, the theoretical depth profiles calculated with pure theoretical excitation functions showed systematic deviations and did not reproduce the shapes of the experimental depth profiles. The depth profiles calculated with the new cross sections show no such tendency. They reproduce the experimental depth profiles in a much better way. This confirms the need of accurate experimental thin target cross sections for modeling production rates in simulation experiments and in meteorites. Further measurements at higher energies and of new excitation functions for the other target elements producing Kr in meteorites (Rb, Y, Zr) irradiated by GCR protons are in progress and will allow to improve the modeling of Kr in simulation experiments and in real meteoroids. References: [1] Lupke M. (1993) Thesis, Univ. Hannover. [2] Blann M (1994) personal communication. [3] Armstrong T. W. and Chandler K. C. (1972) Nucl. Sci. Eng., 49, 110. [4] Michel R. et al. (1991) Meteoritics, 26, 221. [5] Michel R. et al. (1993) J. Radioanal. Nuclear Chem., 169, 13.

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