On the Production of 36Cl by High-Energy Particles in Thin- and Thick- Target Experiments

Details On the Production of 36Cl by High-Energy Particles in Thin- and Thick- Target Experiments On the Production of 36Cl by High-Energy Particles in Thin- and Thick- Target Experiments

Sep 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995metic..30s.573s&link_type=abstract

Meteoritics, vol. 30, no. 5, page 573

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Scientific paper

Knowledge about the production of cosmogenic nuclides in meteorites, planetary surfaces and cosmic dust is elementary for various cosmophysical studies. Completely known it would contain information about the constancy and the spectral distribution of cosmic radiation and it would allow to decipher the irradiation history of matter under the condition of solar and galactic cosmic ray exposure. Cosmic ray particle interactions with matter can be described by a thin-target approach. In this case integral excitation functions for the main target elements have to be combined with depth dependent spectra of primary and secondary particles, see for instance [1]. On the other hand thick-target simulation experiments have been accomplished [2,3] from which production rates can be directly determined. Both approaches have been investigated and successfully validated for short- as well as for long-lived nuclides, e.g ^10Be and ^26Al [3]. Now extending our investigations on the nuclide ^36Cl irradiation experiments with initial proton energies ranging from 45 MeV up to 2600 MeV have been carried out using the "stacked-foil-technique". We have yet determined integral excitation functions for proton induced production of ^36Cl from the most relevant as well as for some minor target elements in meteorites (e.g. Ca, Ti, V, Mn, Fe, Ni, Co, Cu) providing necessary data for the thin-target approach. ^36Cl in the individual targets has been measured via the ultrasensitive accelerator mass spectrometry after a radiochemical separation. For a validation of the above mentioned model calculations based on the thin-target approach by Michel et al. [1], the depth dependent elemental production rates of ^36Cl from the main target elements have been measured in two artificial meteorites made out of gabbro and iron (radii 25 cm and 10 cm respectively) irradiated isotropically with 1,6 GeV protons [3,4]. The theoretical calculations agree reasonably well with our experimental results for the target elements Ti, Fe and Ni. First calculations of production rates in stony meteorites (e.g. Knyahinya) and in an Apollo 15 drill core based on the model by Michel et al. [1] are also in good agreement with the existing experimental data of Reedy et al. [5] and Nishiizumi et al. [6]. References: [1] Michel R. et al. (1991) Meteoritics, 26, 221. [2] Michel R. et al. (1989) Analyst, 114, 295. [3] Michel R. et al. (1993) J. Radioanal. Nucl. Chem., 169, 13. [4] Michel R. et al. (1993) Meteoritics, 28, 399. [5] Reedy R. et al. (1993) LPS XXIV, 1195 [6] Nishiizumi K. (1994) LPS XXV, 1003.

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