[1] Univ Michigan, Mat Sci & Engn, Ann Arbor, MI 48109 USA
[2] Univ Tennessee, Nucl Engn, Knoxville, TN 37996 USA
[3] Univ Michigan, Earth & Environm Sci, Ann Arbor, MI 48109 USA
[4] Stanford Univ, Geol Sci, Stanford, CA 94305 USA
[5] Australian Natl Univ, Res Sch Phys & Engn, Canberra, ACT 2601, Australia
[6] GSI Helmholtz Ctr Heavy Ion Res, D-64291 Darmstadt, Germany
[7] Tech Univ Darmstadt, D-64287 Darmstadt, Germany