Cross sections for the spallation production of 10Be in targets of N, Mg, and Si and their astrophysical applications

Details Cross sections for the spallation production of 10Be in targets of N, Mg, and Si and their astrophysical applications Cross sections for the spallation production of 10Be in targets of N, Mg, and Si and their astrophysical applications

Apr 1974

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1974phrvc...9.1385r&link_type=abstract

Physical Review C, vol. 9, Issue 4, pp. 1385-1395

Physics

13

Scientific paper

Using an isotope-separator technique, cross sections have been measured for the spallation production of 10Be in targets of N, Si, and Mg by protons of 600 MeV and in N by protons of 150 MeV. For 600-MeV protons σ(10Be)=1.3+/-0.6,0.7+/-0.3, and 1.3+/-0.4 mb in N, Si, and Mg respectively. For 150-MeV protons σ(10Be)=0.6+/-0.2 mb in N. The results are discussed in terms of the cosmogenic production of 10Be in meteorites, lunar surface, cosmic dust, the earth's atmosphere, and the interstellar gas. It is shown that the Si and Mg components of chondritic material will be important sources of 10Be, at least as far as the primary galactic flux is concerned. It is also pointed out that the quantitative evaluation of the 10Be from lighter nuclei such as oxygen in meteorites and nitrogen in the earth's atmosphere depends strongly on the magnitude of the (unmeasured) secondary-neutron-induced reactions. 10Be is shown to be a small fraction of the total Be formed in the spallation of cosmic rays over the whole range of important primary nuclei. Using standard radiochemical techniques cross sections have also been measured for 7Be and 22Na production in targets of Si and Mg irradiated by 600-MeV protons. The results differ significantly from previously published values. [NUCLEAR REACTIONS 14N(p,x)10Be, E=150,600 MeV, 24Mg, 28Si(p,x)10Be, 7Be, 22Na, E=600 MeV, measured σ's. Discuss implications for cosmogenic production of 10Be.]

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