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71.
T. Minamisono Y. Yasui T. Ohtsubo A. Kitagawa Y. Matsuo Y. Nojiri K. Matsuta S. Takeda 《Hyperfine Interactions》1990,59(1-4):153-156
The nuclear electric quadrupole moment of41Sc(Iπ=7/2−) was experimentally determined by use of the NMR detection in which the asymmetric β-ray distribution from spin polarized
nuclei was monitored. The magnetic interaction of the state with high external magnetic field and the nuclear quadrupole interaction
with the electric field gradient obtained in TiO2 crystal were studied. The field gradient seen to the implanted41Sc was measured independently by the high field NMR detection on the stable isotope45Sc located in the equivalent41Sc site with. |Q(41Sc;Iπ=7/2−)|=(0.120±0.006) b was determined. 相似文献
72.
T. Nagatomo K. Matsuta K. Minamisono T. Sumikama M. Mihara A. Ozawa Y. Tagishi M. Ogura R. Matsumiya M. Fukuda M. Yamaguchi T. Yasuno H. Ohta Y. Hashizume H. Fujiwara A. Chiba T. Minamisono 《Hyperfine Interactions》2007,180(1-3):75-78
The alignment correlation term in the β-ray angular distribution from purely nuclear spin aligned 20F has been measured to test the G-parity conservation law which is one of the fundamental symmetries in the weak nucleon current. We utilized the hyperfine interaction of 20F in an MgF2 single crystal and successfully created the pure alignment from the polarization by means of the spin manipulation technique based on the β-NMR method. 相似文献
73.
T. Ohtsubo H. Hirano S. Takahashi K. Matsuta M. Mihara M. Fukuda T. Nagatomo T. Izumikawa S. Momota D. Nishimura J. Komurasaki D. Ishikawa D. M. Zhou Y. N. Zheng S. Y. Zhu A. Kitagawa M. Kanazawa M. Torikoshi S. Sato T. Minamisono Y. Nojiri R. Matsumiya T. Sumikama K. Tanaka K. Yamada A. Ozawa T. Suzuki T. Yamaguchi S. Nakajima K. Yoshida Y. Nakashima H. Fujiwara S. Kumashiro M. Ota D. Shinojima H. Tanaka T. Yasuno K. Muranaka T. Maemura A. Chiba S. A. Pahlovy M. Nagao R. Watanabe T. Kubo I. Tanihata M. Takechi K. Minamisono J. R. Alonso G. F. Krebs T. J. M. Symons 《Hyperfine Interactions》2007,180(1-3):85-89
We measured the polarization of the $\upbeta $ -emitting 23Ne (I π ?= 5/2?+?, T 1/2?= 37.24 s) and 25Al(I π ?= 5/2?+?, T 1/2?= 7.18 s) produced through the one nucleon pickup reactions and 24mAl(I π ?= 1?+?, T 1/2?= 131 ms, E ex?= 426 keV) and 28P(I π ?= 3?+?, T 1/2?= 270 ms) produced through charge-exchange reactions in the intermediate energy heavy ion collisions. We compared them with those from the projectile fragmentation process. The larger polarization seems to persistently be positive throughout the momentum distribution, and sharper momentum distributions suggest that nuclear friction mechanism is responsible for the polarization phenomena. 相似文献
74.
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. 《Hyperfine Interactions》1999,120(1-8):661-665
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. 相似文献
75.
Sato K. Akai H. Maruyama Y. Minamisono T. Matsuta K. Fukuda M. Mihara M. 《Hyperfine Interactions》1999,120(1-8):145-149
We present ab initio calculations of electric field gradients (EFGs) at impurity sites in ionic crystals TiO2, Al2O3 and CaCO3. The electronic structure was calculated self-consistently by the KKR method in the framework of the local spin density approximation
of the density functional theory. The system with a single impurity was simulated by the super cell method. It was found that
EFGs for the transition metal impurities (Sc, Nb, Cd and Ta) in TiO2 were well reproduced by the calculations if the charge state of them in TiO2 was taken into account. The present method was applied to the determination of the implantation sites of N and O nuclei in
TiO2. The calculation of EFGs at a Si impurity in Al2O3 and at Ca site in CaCO3 were used to derive the quadrupole moments of 27Si and 39Ca from their quadrupole coupling constants.
This revised version was published online in August 2006 with corrections to the Cover Date. 相似文献
76.
Matsuta K. Minamisono T. Tanigaki M. Onishi T. Fukuda M. Mihara M. Akai H. Sasaki M. Yamaguchi T. Miyake T. Sato K. Minamisono K. Ha C. Tanaka K. Kidera K. Morishita A. Kaminaka S. Tsubota T. Sumikama T. Kitagawa A. Torikoshi M. Kanazawa M. Nishio T. Koda S. Ohtsubo T. Nojiri Y. Momota S. Hanna S.S. Alonso J.R. Krebs G.F. Symons T.J.M. 《Hyperfine Interactions》1999,120(1-8):719-723
The Knight shifts K for short-lived β emitters 12N and 27Si implanted in Pt have been measured by means of β-NMR technique. The results were K(12N in Pt)= +(5.8 ± 2.1)× 10-4 and K(27Si in Pt)= +(1.4 ± 0.8)× 10-3. The spin–lattice relaxation time T1 was measured for 12N in Pt. The result was T1(12N in Pt, T=300 K)= 66 ± 8 ms, thus, T1T= 20 ± 2 Ks. The present Knight shifts are in good agreement with the KKR band structure calculation with local lattice relaxation
determined theoretically.
This revised version was published online in August 2006 with corrections to the Cover Date. 相似文献
77.
Hideyuki Matsuta 《光谱学快报》2013,46(10):757-760
A coherent forward scattering spectrometer was used as a wavelength tuning indicator for diode laser atomic absorption spectrometry. Atomic absorption transition of excited argon atoms at 842.46 nm was investigated. Argon atoms were excited in a glow discharge. Coherent forward scattering signal attained maximum at 0.1 T of external magnetic field and at 12 mA discharge current in 266 Pa (2 Torr) of argon. When the lasing wavelength crossed an atomic absorption line, a spike-like signal was observed. When a continuous coherent forward scattering signal was observed, the lasing wavelength was confirmed to approach within about ±3 pm from the absorption transition of argon. 相似文献
78.
S. Momota M. Mihara D. Nishimura M. Fukuda Y. Kamisho M. Wakabayashi K. Matsuta S. Suzuki M. Nagashima Shengyun Zhu Daqing Yuan Yongnan Zheng Zuo Yi Ping Fan T. Izumikawa A. Kitagawa S. Sato M. Kanazawa M. Torikoshi T. Minamisono Y. Nakamura K. Tashiro A. Honma N. Yoshida H. Shirai T. Ohtsubo T. Nagatomo H. Uenishi K. Iwamoto M. Yaguchi T. Ogura T. Ito K. Yamamura Y. Ichikawa Y. Nojiri J. R. Alonso T. J. M. Symons 《Hyperfine Interactions》2013,218(1-3):53-58
Hyperfine interactions were studied in the intermetallic compound GdRh2Si2 by perturbed angular correlation (PAC) technique using 181Hf(181Ta) probe nuclei. The measurements were performed in the temperature range 15–285 K. The PAC spectra above the antiferromagnetic ordering temperature of the GdRh2Si2 compound (T N ~ 106 K), were analyzed using a model that included only electric quadrupole interactions. The observed major fraction was assigned to the 181Hf(181Ta) probe substituting the Gd atoms. The PAC spectra below Néel temperature were analyzed using combined electric quadrupole and magnetic dipole interactions. The Bhf value at Gd, measured at 15 K was found to be 1.4(1) T which, is smaller, when compared with the values obtained in this compound using other nuclear probes, 155Gd (Bhf ~ 30 T) and 140Ce (Bhf ~ 26 T). The present result using 181Hf(181Ta) probe is quite interesting since it shows that the contribution to Bhf at Gd due the host is smaller than other components which contribute to the hyperfine field. The temperature dependence of Bhf shows an anomalous behavior. 相似文献
79.
Nojiri Y. Ishiga K. Onishi T. Sasaki M. Ohsumi F. Kawa T. Mihara M. Fukuda M. Matsuta K. Minamisono T. 《Hyperfine Interactions》1999,120(1-8):415-418
Hyperfine interactions of 8Li impurity nucleus imbedded in ferromagnetic Ni metal were studied using the β-NMR technique. Two kinds of hyperfine fields
B82 were found, corresponding to two different final sites of Li atoms in the Ni lattice. The nuclear spin-lattice relaxation
times T1 of 8Li in Ni were also determined for each field. Temperature dependencies of B82 and T1 were observed to deduce these values at T=0 K that can be compared with those calculated recently by Akai et al.
This revised version was published online in August 2006 with corrections to the Cover Date. 相似文献
80.
T. Nagatomo T. Sumikama M. Ogura K. Matsuta Y. Nakashima K. Akutsu T. Iwakoshi H. Fujiwara T. Minamisono M. Fukuda M. Mihara K. Minamisono T. Miyake S. Momota Y. Nojiri A. Kitagawa M. Sasaki M. Torikoshi M. Kanazawa M. Suda M. Hirai S. Sato S. Y. Zhu J. Z. Zhu Y. J. Xu Y. N. Zheng J. R. Alonso G. F. Krebs T. M. Symons 《Hyperfine Interactions》2004,159(1-4):269-272
The electric quadrupole coupling constants eqQ/h of 8B (, T
1/2 = 769 ms) and 13B (, T
1/2 = 17.4 ms) in single crystal TiO2 have been precisely measured by the β-NQR technique. The ratios of these Q moments to Q(12B) were determined as ∣Q(8B)/Q(12B)∣ = 4.882(32) and ∣Q(13B)/Q(12B)∣ = 2.768(24). 相似文献