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61.
Ryosuke Kadono Akira Matsushita Kusuo Nishiyama Kanetada Nagamine 《Hyperfine Interactions》1994,87(1):979-984
In order to shed new light on the initial loss of muon spin polarization, or socalled missing fraction, which is commonly observed in non-metallic solids, we have studied muon-induced excitation in various alkali halides by measuring the luminescences associated with the radiative decay of the self-trapped excitons (STE). The result strongly suggests that the spin-exchange interaction between muonium and muon radiolysis products including STE's causes fast muon depolarization in those materials. 相似文献
62.
A method of low-temperature nuclear orientation of bulk amount of Bi was developed utilizing a ferromagnetic compound BiMn. The radioactive isotopes of Bi,207Bi and206Bi, were oriented by this method and the hyperfine field at Bi in BiMn was determined to be ±(940 ?130 +180 ) kOe. No reorientation effect was observed at the isomers in207Pb and206Pb around 30 mK. The E2/M1 multipole mixing ratios of several γ-transitions in206Pb were determined. 相似文献
63.
Kanetada Nagamine Kusuo Nishiyama Jun Imazato Hisayoshi Nakayama Masayuki Yoshida Yoichi Sakai Haruo Sato Takeshi Tominaga 《Chemical physics letters》1982,87(2):186-191
The relaxation rate of muonium in pure water has been found to be smaller than 0.05 × 106 s?1. With the aid of pulsed muong. μSR and MuSR measurements have been carried out over a longer time range than ever achieved. The results indicate a stability of thermal muonium in water from 3 to 29°C. 相似文献
64.
Yasuo Ito Yasuhiro Miyake Yoneho Tabata Kusuo Nishiyama Kanetada Nagamine 《Chemical physics letters》1982,93(4):361-365
Muonium has been observed in neopentane and tetramethylsilane by a pulsed MuSR method. The probability of muonium formation was ≈ 20%, and its relaxation times were 8 and 2.6 μs for liquid neopentane and tetramethylsilane, respectively. The rate of muonium relxation has been shown to be correlated well with the dissociation energy of the CH bonding. 相似文献
65.
T. Yamazaki S. Nagamiya O. Hashimoto K. Nagamine K. Nakai K. Sugimoto K.M. Crowe 《Physics letters. [Part B]》1974,53(1):117-120
The g factors of the negative muons bound to Zn, Cd, and Pb nuclei have been determined. The observed values after the corrections for the internal fields have shown substantial deviations from the free-muon g factor: is (1.3±0.6)% for Zn, (2.2±1.4) % for Cd, and (5.0±2.2)% for Pb. These shifts are in good agreement with the relativistic binding corrections for finite-size nuclei calculated by Ford et al. 相似文献
66.
67.
Kaya T Nagamine K Matsui N Yasukawa T Shiku H Matsue T 《Chemical communications (Cambridge, England)》2004,(2):248-249
[small beta]-Galactosidase expression in a small number of Escherichia coli cells has been measured in real time with an electrochemical sensor chip. E. coli cells were embedded using collagen gel within a micropore which was microfabricated onto a chip. The activity of the expressed [small beta]-galactosidase was determined using p-aminophenyl [small beta]-d-galactopyranoside (PAPG) as a substrate. 相似文献
68.
R. H. Scheicher A. N. U. Roy T. P. Das K. Ishida T. Matsuzaki S. N. Nakamura N. Kawamura K. Nagamine 《Hyperfine Interactions》2001,138(1-4):387-395
The study of trapping of He+ ion in solid hydrogen is important both as a problem in solid state physics and also as an applied physics problem in the
field of muon catalyzed fusion (μCF). In μCF, He+ ion acts as a trap for μ−, interrupting the chain reaction aspect of the catalytic role of μ− in producing fusion of deuteron and triton and of triton and triton in solid hydrogen composed of 2H–3H and 3H–3H molecules, respectively. Using the Hartree–Fock procedure, combined with procedures for including many-body effects, as
well as relaxation effects associated with the He+–H2 distances and the adjustment of the H–H separation, we have investigated the trapping of He+ in gaseous and solid state environments. For the former, the environment of He+ is simulated by a single hydrogen molecule and for the solid by clusters appropriately chosen to represent the hexagonal
close-packed structure. Our results for the gaseous state indicate that the trapping is rather strong with a binding energy
of 8.5 eV, with almost equal binding energy in the linear and triangular configurations with respect to the H–H direction.
For the solid, both the likely sites for He+ trapping, namely the tetrahedral and octahedral interstitial sites, are also found to provide deep traps (8.6 eV) of almost
equal strength, independent of the orientations of the neighboring molecules, showing that the trapping is not influenced
by the orientational disorder in the surrounding hydrogen molecules. Further, the influence of next nearest neighbor hydrogen
molecules is found to enhance the trapping energy for He+ substantially, by 0.6 eV, with the incorporation of the third nearest neighbors having a much smaller added effect, demonstrating
the convergence of our results with respect to the size of the cluster chosen to simulate the solid. The substantial influence
on the He+ trapping energy found for the neighbors beyond the nearest ones provides an explanation of the greater accumulation of helium
in the solid state of hydrogen in μCF experiments as compared to the liquid. Suggestions are made regarding the possible reasons
for the almost negligible accumulation of helium in the liquid state.
This revised version was published online in August 2006 with corrections to the Cover Date. 相似文献
69.
Cammarere D. Scheicher R. H. Briere T. M. Sahoo N. Das T. P. Pratt F. L. Nagamine K. 《Hyperfine Interactions》2001,136(3-8):759-762
Muon Spin Relaxation (μSR) experiments are currently being conducted on the important electron transfer molecule cytochrome
c (cyt c) with the goal to find out about microscopic details of the path the moving electron is taking. Simultaneously we
are using the Unrestricted Hartree–Fock Cluster Procedure to determine the trapping sites for muon (μ+) and muonium (Mu) in the heme unit of cyt c and the associated hyperfine interactions. For the trapping sites with the highest
binding energies for μ+, namely the nitrogen and the carbon of the pyrrole rings, we have used the available magnetic susceptibility data together
with our calculated hyperfine fields to predict the Knight-shifts. At room-temperature we found 88.4 ppm and 79.0 ppm for
the most attractive N- and adjacent C-site, respectively. At 150 K, these shifts increase to 172.7 ppm for the N-site and
153.7 ppm for the C-site.
This revised version was published online in September 2006 with corrections to the Cover Date. 相似文献
70.
A. Toyoda K. Ishida K. Shimomura Y. Matsuda W. Higemoto S. N. Nakamura T. Matsuzaki K. Nagamine 《Hyperfine Interactions》2001,132(1-4):307-312
Recently, the applicability of Penning trap mass spectrometry has been extended to nuclides with a half-life of less than
one second. The mass of 33Ar (T
1/2=174 ms) was measured using the ISOLTRAP spectrometer with an accuracy of 4.2 keV. This measurement provided a stringent test
of the Isobaric Multiplet Mass Equation (IMME) at mass number A=33 and isospin T=3/2. The fast measurement cycle that shows the way to other measurements of very-short-lived nuclides is presented. Furthermore,
the results of the IMME test are displayed.
This revised version was published online in July 2006 with corrections to the Cover Date. 相似文献