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Be andCl depth profiles in an Apollo 15 drill core |
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| Authors: | K Nishiizumi D Elmore XZ Ma JR Arnold |
| Institution: | aDepartment of Chemistry, B-017, University of California at San Diego, La Jolla, CA 92037 U.S.A. bNuclear Structure Research Laboratory, University of Rochester, Rochester, NY 14627 U.S.A. |
| Abstract: | Cosmic-ray-produced10Be (t1/2 = 1.6 × 106 years) and36Cl (t1/2 = 3.0 × 105 years) have been measured in the Apollo 15 long core for study of galactic cosmic ray production profiles using tandem accelerator mass spectrometry. From these experiments, the half-attenuation length for10Be production and36Cl production were calculated to be 120 g/cm2 and 132 g/cm2 (150–400 g/cm2 region). The measured half-attenuation length for10Be is slightly longer than that predicted by the Reedy-Arnold theoretical model. The flatter and somewhat deeper maximum seen in the36Cl profile compared to the10Be,26Al and53Mn profiles can be explained by production from secondary thermal neutrons on35Cl. |
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