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71.
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
72.
K. Nagamine 《Hyperfine Interactions》2001,138(1-4):5-13
Since EXAT98 at Ascona, significant progress has been marked for experimental investigations of the fundamental understanding
of muon catalyzed fusion (μCF) phenomena in D–T, D2 and other hydrogen systems. Future progress in the μCF studies is now guaranteed due to the successful launching of advanced
accelerator projects such as JAERI-KEK Joint Proton Accelerator project and RI Beam Factory project at RIKEN. Also, the start
of the next-phase thermal nuclear fusion project of ITER becomes promising so that some future contributions from ITER to
μCF or vice-versa can be expected for various physical or technological aspects of fusion research. The future progress of
μCF studies will also be promoted because of the growth of various other scientific research using muons. The essence of all
these subjects is reviewed.
This revised version was published online in August 2006 with corrections to the Cover Date. 相似文献
73.
Y. Miyake K. Nishiyama S. Sakamoto K. Shimomura R. Kadono W. Higemoto K. Fukuchi S. Makimura J. L. Beveridge K. Ishida T. Matsuzaki I. Watanabe Y. Matsuda N. Kawamura K. Nagamine 《Hyperfine Interactions》2001,138(1-4):475-482
The muon science facility is one of the experimental arenas of the JKJ project, which was recently approved for construction
in a period from 2001 to 2006, as well as neutron science, particle and nuclear physics, neutrino physics and nuclear transmutation
science. The muon science experimental area is planned to be located in the integrated building of the facility for the materials
and life science study. One muon target will be installed upstream of the neutron target in a period of phase 1. The beam
line and facility are designed to allow the later installation of a 2nd muon target in a more upstream location. The detailed
design for electricity, cooling water, primary proton beam line, one muon target and secondary beam lines (a superconducting
solenoid decay muon channel, a dedicated surface muon channel, and an ultra slow muon channel) is underway. In the symposium,
a latest status of the muon science facility at JKJ project will be reported.
This revised version was published online in August 2006 with corrections to the Cover Date. 相似文献
74.
R. Kadono T. Matsuzaki K. Nagamine T. Yamazaki D. Richter J. -M. Welter 《Hyperfine Interactions》1986,31(1-4):205-210
Using the Zero-Field μSR method coupled with the unique pulsed muon beam, new systematic measurements of diffusion (hopping)
rate of positive muon were performed for the two ultra-pure copper samples (residual resistivity ratio = 18,000 and 7,350)
and for the copper doped with 95 ppm iron. For these measurements a new detection system with an improved time resolution
was installed to reduce the distortion of μ-e decay time spectrum due to the counting loss of positrons. A preliminary result
suggests that the leveling-off of the hopping rate below 0.5 K is not affected by the purity for the ultra-pure sample, while
it is strongly modified for the doped copper. 相似文献
75.
K. Nishiyama K. Nagamine H. Kitazawa E. Torikai H. Kojima I. Tanaka 《Hyperfine Interactions》1991,65(1-4):1015-1026
A novel microscopic method of muon spin rotation for negative muon (μ−) attached to oxygen is applied on highT
c materials LaSrCuO. The paramagnetic shift and relaxation rate are measured as a function of Sr concentration and temperature.
Analysis shows the large difference in shift and relaxation between two different sites. A large anisotropy was also observed
by preliminary measurements along different crystalline axes. 相似文献
76.
N. Nishida S. Okuma H. Miyatake S. Shiratake Y. Hidaka T. Murakami Y. Ueda K. Kosuge S. Kambe H. Yasuoka H. Takagi S. Uchida K. Nishiyama K. Nagamine Y. Kuno T. Yamazaki 《Hyperfine Interactions》1991,65(1-4):1027-1034
The negative muon spin rotation method (μ− SR) has been applied to studies of electronic states at oxygen sites of oxide superconductors YBa2Cu3O7, Nd2−x
Ce
x
CuO4−δ (x=0.15, oxygen reduced), LiTi2O4 and related oxide-insulators La2CuO4−δ, CuO, Cu2O. The paramagnetic shifts of μ− trapped at oxygen nuclei in these polycrystalline powder samples have been measured at 300 K. All the measured shifts are
positive. In copper-oxides the paramagnetic shifts are of the order 10−3, while in LiTi2O4 is very small (8.4±3.34×10−5). In YBa2Cu3O7, a fast μ− spin relaxation timeT
2
* (∼ 200 ns) has been observed; the reason for this is unknown and further studies are now in progress. 相似文献
77.
K. Ishida T. Matsuzaki K. Nagamine H. Kitazawa Y. Miyake E. Torikai 《Hyperfine Interactions》1991,65(1-4):1159-1165
A new type of beam transport system for secondary light charged particles (“Large Ω” Beam Course) has been constructed and
used to transport surface muons from the decay of pions produced in heavy-ion reactions at RIKEN Ring Cyclotron (RRC). In
an experiment carried out using a14N beam of 135 MeV/u and a carbon target of 0.9 g/cm2 thickness, the surface muon intensity obtained in 5×5 cm2 sample was around 100 1/s for 500 nA of the primary beam. This number may be increased by two orders if the energy were doubled. 相似文献
78.
E. Baggio-Saitovitch F. J. Litterst K. Nagamine K. Nishiyama E. Torikai 《Hyperfine Interactions》1991,63(1-4):259-263
μSR and57Fe Mössbauer spectroscopy were used to study the magnetic properties of powders ofsemiconducting YBa, (Cu0.95Fe0.05)3O6+δ using the same sample in the temperature range from 4–300 K. TF and ZF μSR were performed at the BOOM facility at KEK using the pulsed surface beam. 相似文献
79.
The enantioselectivity of the intramolecular asymmetric aldol reaction of 1,3-cycloheptanedione bearing a C-2 methyl substituent, mediated by a series of combinations of L-amino acid and Br?nsted acid, was examined in detail. 相似文献
80.
A detailed study to assess the enantioselectivity of the amino acid mediated intramolecular asymmetric aldol reaction of 1,3-cycloheptanedione bearing a C-2 methyl substituent has been undertaken. The cyclizations were mediated by a series of l-amino acids in the presence of an acid cocatalyst. Strikingly, the process is characterized by an inversion of enantioselectivity when compared to a similar reaction involving the 1,3-cyclohexanedione counterpart. 相似文献