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Hyperfine interactions of 19O in TiO2 and quadrupole moments of 13,19O |
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| Authors: | Sato K Miyake T Morishita A Matsuta K Minamisono T Tanigaki M Takeda S Mihara M Fukuda M Nojiri Y Minamisono K Fukao T Matsumoto Y Ohtsubo T Fukuda S Momota S Yoshida K Ozawa A Kobayashi T Tanihata I Sagawa H Kitagawa H Krebs Gray F Alonso Jose R Symons T James M |
| Institution: | (1) Department of Physics, Graduate School of Science, Osaka University, Toyonaka, Osaka 560-0043, Japan;(2) Cyclotron and Radio Isotope Center, Tohoku University, Sendai, Miyagi 980-77, Japan;(3) Faculty of Engineering, Gunnma University, 1-5-1 Tenjin, Kiriu 376, Japan;(4) Kochi University of Technology, Tosayamada, Kochi 782, Japan;(5) Department of Physics, Faculty of Science, Niigata University, Niigata 950-21, Japan;(6) The Energy Research Center, Wakasa Bay, Tsuruga, 914 Fukui, Japan;(7) RIKEN, Wako, Saitama 351-01, Japan;(8) Center for Mathematical Sciences, University of Aizu, Aizuwakamatsu, Fukushima 965, Japan;(9) Faculty of Science, Tokyo Metropolitan University, Hachioji, Tokyo 192-03, Japan;(10) Lawrence Berkeley Laboratory, Berkeley, CA 94720, USA |
| Abstract: | The electric quadrupole interaction of 19O(Iπ=(5/2)+, T1/2=27.0 s) in TiO2 single crystal was studied in detail by means of the β-NQR to determine the electric quadrupole moments Q of short-lived β-emitting nuclei 19O and 13O(Iπ=(3/2)-, T1/2=8.6 ms). Two implantation sites were found for the implanted O nucleus and the quadrupole coupling constants of 19O at these sites were determined. We observed FT-NMR of the enriched stable isotope 17O in TiO2 and obtained the electric field gradient (EFG) at the oxygen substitutional site. With this knowledge, we have determined Q(13O)=11.0 ± 1.3 mb and Q(19O)=3.7 ± 0.4 mb. The present results are compared with the theoretical values calculated by the shell model code, OXBASH and by the Hartree–Fock calculation with the realistic potential. This revised version was published online in August 2006 with corrections to the Cover Date. |
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