Irradiation Records of Gas-rich or Brecciated Meteorites Studied from Sm and Gd Isotopic Shifts by Neutron Capture Reactions

BRECCIATED METEORITES STUDIED FROM Sm AND Gd ISOTOPIC SHIFTS BY NEUTRON CAPTURE REACTIONS. H. Hidaka, R. Bartoschewitz, S. Yoneda. Dept. of Earth and Planetary Systems Science, Hiroshima Univ., Higashi-Hiroshima 739-8526, Japan. E-mail: hidaka@hiroshima-u.ac.jp Bartoschewitz Meteorite Lab, Lehmweg 53, D-38518 Gifhorn, Germany. Department of Engineering and Science, National Science Museum, Tokyo 169-0073, Japan.