| Autor: |
Herzog G.F., Caffee M.W., Faestermann T., Hertenberger R., Korschinek G., Leya I., Reedy R.C., Sisterson J.M. |
| Rok vydání: |
2011 |
| Zdroj: |
Meteoritics & Planetary Science |
| DOI: |
10.1111/j.1945-5100.2011.01236x |
| Popis: |
Cross sections were measured for the nuclear reactions natMg(3Hex)26Al 27Al(3Hex)26Al natCa(3Hex)41Ca and natCa(3Hex)36Cl in the energy region from approximately 5–35 MeV. The rates of these reactions are important for studies of early solar system irradiation scenarios. The 26Al 36Cl and 41Ca were separated chemically and the numbers of atoms produced in each reaction channel were measured using accelerator mass spectrometry (AMS). From these results 26 cross sections were determined and compared with predictions of the TALYS code. Agreement is within 40 for most cross sections. Our measurements were used to model the production of 7Be 10Be 26Al and 41Ca in the early solar system. For projectiles 1H 3He and 4He we assumed energy spectra of the general form E)a. For a wide range of parameterizations the modeled ratios of 7Be / Be and 10Be / Be on the one hand and of 26Al / 27Al and 41Ca/Ca on the other are coupled because the excitation functions for the relevant nuclear reactions have similar shapes. Modeling of a closed system with the constraint that 10Be / 9Be = 0.001 fails to reproduce simultaneously the range of 7Be / 9Be 26Al / 27Al and 41Ca/Ca ratios inferred for the early solar system from studies of meteorites. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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