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S. Momota Y. Nojiri M. -B. Tanaka T. Yanagisawa M. Fukuda K. Matsuta T. Minamisono 《Hyperfine Interactions》1993,80(1-4):1275-1279
To disclose the basic mechanisms of nuclear polarization creation realized by the tilted foil technique, hyperfine quantum beats of the nuclear polarization of the short-lived beta-emitter8Li(I
=2+,T
1/2=840 ms) were measured as a function of the distance between two tilted foils. From the observed beats of the8Li nuclear polarization, it was found that the Fermi-contact interaction of the8Li nucleus with the ground 1s-electron in LiIII plays a main role in the final stage of polarization transfer from polarized orbital electrons to the8Li nucleus. 相似文献
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T. Minamisono S. Fukuda T. Ohtsubo M. Tanigaki A. Kitagawa M. Fukuda K. Matsuta Y. Nojiri S. Takeda 《Hyperfine Interactions》1993,78(1-4):191-194
Quadrupole effects in -NMR spectra of41Sc(I
=7/2–,T
1/2=0.596 s) implanted in a TiO2 single crystal were detected by use of a modified -NMR technique. Using the field gradient in the crystal determined by the pulsed-Fourier-transformed NMR of45Sc in TiO2, the quadrupole moment of41Sc has been determined as |Q(41Sc; 7/2–)|=166±8 mb. 相似文献
5.
S. Momota Y. Nojiri M. -B. Tanaka T. Yanagisawa M. -Y. Tanaka M. Fukuda K. Matsuta T. Minamisono 《Hyperfine Interactions》1993,80(1-4):1281-1286
In order to study the basic mechanism of polarization enhancement realized by the multitilted foil technique, nuclear polarization of short-lived beta-emitter8B(T1/2=769 ms,I
=2+) was induced. Utilizing up to ten tilted foils, the polarization enhancement was measured as a function of the foil numbers. The observed enhancement for8B was combined with the previous results for12B(I
=1+,T
1/2=20 ms) which has the same atomic configurations but different nuclear spin. Analyzing these results in the framework of the classical vector model, the essential features of the enhancement depending on the nuclear spin was disclosed. 相似文献
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The physical principles of atomic and nuclear polarization by the tilted-foil interaction as applied to the production of polarized emitters for NMR probes are discussed. 相似文献
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Shin'ichi Nojiri 《Zeitschrift fur Physik C Particles and Fields》1984,22(3):245-249
We develop a variational method in order to study non-perturbative structure of the vacuum wave functional in QCD. To retain gauge invariance, we employ a vacuum test functional motivated by the structure of perturbation theory. The resultant integral equation contains only renormalizable logarithmic divergences and is reliable in the weak coupling region. We find that this equation contains a non-perturbative solution besides the perturbative one, and the energy in the former state is lower. Further it is shown that the gluon condensation <G μv a2 > calculated using this non-perturbative solution agrees with the result of several authors. 相似文献
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Using a nuclear reaction, the polarized short-lived -emitters12B and12N were implanted into Si, Ge, and GaP crystals. Hyperfine fields were studied via both NMR techniques and an external magnetic holding field Hext on-off techniques in an Hext range 0–8 kG and a temperature range 100–1000 K. No significant NMR signal was observed between 2 and 30 MHz for12N in Si and Ge despite maintenance of 60% polarization at T100 K and Hext>4 kG, whereas for12B in Si at T>800 K almost full polarization was found at the Larmor frequency. 相似文献
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