Development of a Nuclear Spin Dewar: Hyperfine Interactions of the Short-Lived βEmitter 12B in TiO2

M. Ogura, K. Minamisono, T. Sumikama, T. Nagatomo, T. Iwakoshi, T. Miyake, S. Kudo, K. Akutsu, M. Mihara, M. Fukuda, K. Matsuta, H. Akai, T. Minamisono, K. Sato

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1 Citation (Scopus)


The β-NMR detection of 12B (Iπ = 1+, T1/2 = 20.2 msec) implanted in a TiO2 (rutile) single crystal following a nuclear reaction showed that its spin polarization produced in the reaction is totally maintained during its lifetime. Two implantation sites with relative populations 9:1 were identified. The electric field gradients (EFGs) were determined to be q = +(37.1 ± 0.5) 1015 V/cm2 with π < 0.03 and q = +(185 ± 5) 1015 V/cm2 with π = 0.62 ± 0.02 for the major (90%) and minor (10%) sites, respectively. The EFGs were compared with the theoretical values given by the band-structure calculation in the framework of the KKR method. TiO2 crystals with proper treatment can be a good “Spin Dewar” in which any short-lived nuclei can be implanted, and their spin polarizations as produced in nuclear reactions can be maintained during their lifetime.

Original languageEnglish
Pages (from-to)599-602
Number of pages4
JournalZeitschrift fur Naturforschung - Section A Journal of Physical Sciences
Issue number6-7
Publication statusPublished - 2002 Jul
Externally publishedYes


  • Electric Field Gradient
  • Nuclear Polarization
  • TiO
  • β-NMR

ASJC Scopus subject areas

  • Mathematical Physics
  • Physics and Astronomy(all)
  • Physical and Theoretical Chemistry


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