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111.
112.
Matsuta K. Onishi T. Fukuda M. Minamisono T. Akai H. Sasaki M. Yamaguchi T. Miyake T. Sato K. Minamisono K. Ohsumi F. Muramoto Y. Oui S. Ha C. Tanaka K. Kidera K. Morishita A. Kitagawa A. Torikoshi M. Kanazawa M. Nishio T. Koda S. Ohtsubo T. Fukuda S. Nojiri Y. Momota S. Ozawa A. Yoshida K. Suzuki T. Kobayashi T. Tanihata I. Hanna S.S. Alonso J.R. Krebs G.F. Symons T.J.M. 《Hyperfine Interactions》1999,120(1-8):673-677
The β-NMR spectra of 21F, 23Mg, 27Si and 39Ca which were produced in heavy ion collisions and implanted in various crystals have been observed. The magnetic moments
of 21F and 27Si were determined to be |μ(21F)| = 3.9194 ± 0.0012 μN and |μ(27Si)| = 0.8653 ± 0.0003 μN, respectively. The electric quadrupole coupling constants were determined for the first time to be |eqQ(21F in MgF2)/h|= 9.94 ± 0.09 MHz, |eqQ(23Mg in MgF2)/h|= 1.96 ± 0.06 MHz, |eqQ(27Si in Al2O3)/h|= 1.90 ± 0.12 MHz, |eqQ(39Ca in CaCO3)/h|= 0.60 ± 0.04 MHz. From the present eqQ/h, the Q moments were deduced as |Q(21F)|= 110 ± 22 mb, |Q(23Mg)|= 114 ± 3 mb, |Q(27Si)|= 60 ± 13 mb and |Q(39Ca)|= 36± 7 mb. The present data were compared with the theoretical values obtained by the OXBASH shell model code.
This revised version was published online in August 2006 with corrections to the Cover Date. 相似文献
113.
Matsuta K. Miyake T. Minamisono K. Mihara M. Fukuda M. Sato K. Zhu S. Y. Minamisono T. 《Hyperfine Interactions》2001,136(3-8):189-194
Hyperfine interactions of 12,14N in BN(hexagonal) crystal were studied by detecting β-NQR(12N) and FT-NMR(14N). A β-NMR of 16N (I
π=2−,T
1/2=7.13 s) in MgO crystal was detected to determine the magnetic moment of 16N to be |μ(16N:2−)|=(1.986±0.001)μN. Also, the β-NQR of 12,16N in TiO2 crystal were detected to determine |Q(16N:2−)|=(17.9±1.7) mb. An abnormally small effective charge for neutrons is required to account for |Q(16N:2−)|.
This revised version was published online in September 2006 with corrections to the Cover Date. 相似文献
114.
1 Introduction The production of nuclear spin polarization and the maintenance of the nuclear po-larization in a stopper are the essential requirement for the measurement of nuclear magnetic and electric quadrupole moments of the b-emitting nuclei by the ?NMR and b-NQR (b-ray detected Nuclear Magnetic Resonance and b-ray detected Nuclear Quad-rupole Resonance) technique. This requirement can be realized by the selection tech-nique of the incident particle energy of the nuclear reaction th… 相似文献
115.
An emission excitation source comprising a high-frequency diode-pumped Q-switched Nd:YAG laser and a radio-frequency powered glow discharge lamp is proposed. In this system sample atoms ablated by the laser irradiation are introduced into the lamp chamber and subsequently excited by the helium glow discharge plasma. The pulsed operation of the laser can produce a cyclic variation in the emission intensities of the sample atoms whereas the plasma gas species emit the radiation continuously. The salient feature of the proposed technique is the selective detection of the laser modulation signal from the rest of the continuous background emissions, which can be achieved with the phase sensitive detection of the lock-in amplifier. The arrangement may be used to estimate the emission intensity of the laser ablated atom, free from the interference of other species present in the plasma. The experiments were conducted with a 13.56 MHz radio-frequency (rf) generator operated at 80 W power to produce plasma and the laser at a wavelength of 1064 nm (pulse duration:34 ns, repetition rate:7 kHz and average pulse energy of about 0.36 mJ) was employed for sample ablation. The measurements resulted in almost complete removal of nitrogen molecular bands (N2+ 391.44 nm). Considerable reduction (about 75%) in the emission intensity of a carbon atomic line (C I 193.03 nm) was also observed. 相似文献
116.
Beta-ray angular distributions from aligned12B and12N have been observed in order to study the meson-exchange effect in a nucleus. Alignment-correlation coefficients for12B and12N were determined to be –=–(0.0174±0.0059)%/MeV and +=–(0.2774±0.0086)%/MeV, respectively. These values are fairly consistent with the previous values, while the reliability was greatly improved. From these coefficients, the nuclear parametery, i.e. the ratio of the time component of the axial vector currents of the Gamow-Teller matrix element, was determined to bey=4.13±0.15. The value is enhanced by 33% from that calculated by use of the impulse approximation, which clearly shows a considerable effect due to meson-exchange currents. 相似文献
117.
T. Minamisono T. Ohtsubo I. Minami A. Kitagawa S. Fukuda Y. Nakayama M. Fukuda K. Matsuta Y. Nojiri S. Takeda H. Sagawa H. Kitagawa 《Hyperfine Interactions》1993,78(1-4):165-168
The nuclear quadrupole moment of8B(I
=2+,T
1/2=769 ms) has been determined by use of a modified -NMR detection as |Q(8B)|=68.3±2.1 mb, which is twice the prediction of the Cohen-Kurath shell model calculation. The anomalous quadrupole moment which is carried mainly by the protons in the nucleus, has been accounted for by the proton halo effect. 相似文献
118.
T. Minamisono T. Ohtsubo S. Fukuda Y. Nakayama T. Araki K. Masitani K. Matsuda E. Takahashi M. Tanigaki M. Tanaka H. Shiohara Y. Someda Y. Aoki A. Kitagawa M. Fukuda K. Matsuta Y. Nojiri 《Hyperfine Interactions》1993,78(1-4):111-116
Hyperfine interactions of -emitting17F implanted in single crystals of NaF and CaF2 were studied. The nuclear magnetic moment of theI
=5/2+ state was determined with improved precision to be |(17F;I
=5/2+,T
1/2=64.5s)|=4.72130±0.00025 µN. 相似文献
119.
K. Matsuta A. Ozawa Y. Nojiri T. Minamisono M. Fukuda S. Momota T. Ohtsubo S. Fukuda K. Sugimoto I. Tanihata K. Yoshida K. Omata J. R. Alonso G. F. Krebs T. J. M. Symons 《Hyperfine Interactions》1993,78(1-4):123-126
NMR on the beta emitter43Ti has been observed by use of the -NMR technique. From the observed NMR spectrum, the magnetic moment of43Ti was determined to be || =0.85±0.02 µN. The value is significantly quenched from the single particle value –1.91 µN, which shows a strong effect resulting from meson-exchange currents andconfiguration mixing. 相似文献
120.
Yamaguchi T. Sato K. Ha C. Morishita A. Tanaka K. Miyake T. Sasaki M. Minamisono K. Akai H. Mihara M. Fukuda M. Matsuta K. Nojiri Y. Minamisono T. 《Hyperfine Interactions》1999,120(1-8):689-694
The sign of the quadrupole coupling constant eqQ of 8B in ZrB2 is determined to be positive through the β-delayed α-ray anisotropy measurement combined with the spin manipulation technique
by use of the β-NMR. According to the theoretical calculation of the electric field gradient in ZrB2, the sign of the quadrupole moment of 8B is deduced to be positive.
This revised version was published online in August 2006 with corrections to the Cover Date. 相似文献