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Wataru Higemoto Kanetada Nagamine Shinji Kuroda Koki Takita 《Molecular Crystals and Liquid Crystals》2013,570(2):51-56
Abstract The microscopic state of the positively charged light particle in the transition metal dichalcogenide 2H-NbSe2 was studied using the muon spin relaxation method (μ+SR) and muon level crossing resonance method (μ-LCR). Muons are expected to stay at interlayer position and behaves as a hydrogen like intercalant. We discuss the relation between conduction electron properties and the muon's behavior. 相似文献
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Yoshida Go Ninomiya Kazuhiko Inagaki Makoto Higemoto Wataru Strasser Patrick Kawamura Naritoshi Shimomura Koichiro Miyake Yasuhiro Miura Taichi Kubo Kenya M. Shinohara Atsushi 《Journal of Radioanalytical and Nuclear Chemistry》2019,320(2):283-289
The role of valence electrons for the muon capture process by molecules is experimentally investigated with the aid of cascade calculations. Low-momentum muons are introduced to gas targets of CO, CO2, and COS below atmospheric pressure. The initial states of captured muons are determined from the measured muonic X-ray structure of the Lyman and Balmer series. We propose that the lone pair electrons in the carbon atom of CO significantly contribute to the capture of a muon with large angular momenta.
相似文献5.
Nishiyama K. Higemoto W. Shimomura K. Maruta G. Nishiyama S. W. Watanabe I. 《Hyperfine Interactions》2001,136(3-8):717-721
Muon spin rotation (μSR) experiments were performed on single crystal samples of KH2PO4(KDP) and KD2PO4(dKDP) to study the dynamics of hydrogen in hydrogen bonding systems. At low temperature, the nuclear dipole interaction of
muon and proton was confirmed from the angular dependence of precession frequency of the muon spin under zero magnetic field.
The muon occupation site was also determined. A clear change in μSR spectra was observed at the antiferroelectric transition
temperature (123 K). At 90 K well below the transition temperature, the muon spin starts to relax, possibly due to muon dynamics.
This revised version was published online in September 2006 with corrections to the Cover Date. 相似文献
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Nishiyama K. Higemoto W. Shimomura K. Koda A. Maruta G. Nishiyama S. W. Zheng X. G. 《Hyperfine Interactions》2001,136(3-8):289-294
Precise measurements of the local magnetic field at muon sites in CuO were performed. The temperature dependence of the local
field including spatial orientation was obtained in the ordered state. Not only zero field μSR measurements were performed,
but also external magnetic fields were applied to obtain an unambiguous determination of field direction. Multiple stages
of muon signals were observed at 55 and 80 K. An incommensurate phase between 212 K and 227 K was confirmed from the line
shapes of the local fields at the muon sites.
This revised version was published online in September 2006 with corrections to the Cover Date. 相似文献
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Recent measurements on NiO and CoO show a complex temperature dependence. In this work, the local μ+ fields are examined over an extended temperature range. Only one precession frequency of 61.3 MHz was observed in the μ+ spin precession in zero field in NiO, similar to the case in MnO. The signal broadens at 200 K and is difficult to observe
above 250 K. In contrast, in CoO, at least three lines are observed: two sharp lines at 54.2 MHz, and at 78 MHz, with an additional
small peak at 162 MHz. Above 40 K, the 54.2 MHz signal (CoO) vanishes, but the 78 MHz signal survives to 110 K. However, at
270–280 K, a new signal at 13 MHz is also observed. Dipole field calculations of these 3d‐oxides (MnO, NiO and CoO) for various
lattice sites (symmetric sites and O‐bonded positions) are examined and compared with the experimental results, with considerations
toward the dynamics of the muons.
This revised version was published online in July 2006 with corrections to the Cover Date. 相似文献
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W. Higemoto K. Satoh N. Nishida K. Nishiyama K. Nagamine 《Hyperfine Interactions》1997,106(1-4):39-44
Using a pulsed muon beam, we have investigated the microscopic μ+ behavior in solid H2 and D2 down to 0.6 K by the μ+SR method. From the studies of μ+ spin relaxation phenomena in solid para‐ H2 and ortho‐ D2, we have found that μ+ forms three distinct microscopic states; H2μ+( D2μ+)(20\sim25\%), muonium (15\sim20\%) and μ+(\sim60\%). In H2μ+, the μ+ spin is depolarized in solid para‐ H2 and a local magnetic field Bloc=1\sim2 G is deduced from LF‐μ+SR measurements. The magnitude of Bloc is inconsistent with the magnetic dipolar field (\sim25 G) expected from the magnetic moments of two protons in the H2μ+ molecule and suggests that the H2μ+ molecule might be in the rotationally excited state. From LF‐μ+SR measurements, muonium and μ+ have been found to diffuse in solid o‐ D_2. The diffusion rate of muonium is two order of magnitude larger than that of μ+.
This revised version was published online in August 2006 with corrections to the Cover Date. 相似文献
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Zheng XG Kubozono H Nishiyama K Higemoto W Kawae T Koda A Xu CN 《Physical review letters》2005,95(5):057201
Muon spin rotation experiments are carried out on clinoatacamite, Cu2Cl(OH)3, which is a new geometrically frustrated system featuring a three-dimensional network of corner-sharing tetrahedral 3d Cu2+ spins. A long-range antiferromagnetic order occurs below 18.1 K with a surprisingly small entropy release of about 0.05Rln2/Cu. Below 6.5 K, the static long-range order transforms abruptly into a metastable state with nearly complete depolarization of muon spins which suggests strong fluctuation. The system then enters a state in which partial long-range order and spin fluctuation coexist down to the lowest experimentally attainable temperature of 20 mK. This work presents a novel system for studying geometric frustration. 相似文献
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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