Yasuyuki Matsuda

Density enhancement of muon beams with tapered glass tubes

We have demonstrated that the beam density of 54 MeV/c muons can be increased almost by a factor of two when a tapered glass tube is inserted coaxially along the muon beam. The observations are compared with a multiple Coulomb scattering calculation, which reproduces the observation reasonably. This technique opens a new and simple way to increase the muon intensity effectively.

Double-trap measurement of the proton magnetic moment at 0.3 parts per billion precision.

Nailing down the proton magnetic moment Fundamental physical laws are believed to remain the same if subjected to three simultaneous transformations: flipping the sign of electric charge, taking a mirror image, and running time backward. To test this charge, parity, and time-reversal (CPT) symmetry, it is desirable to know the fundamental properties of particles such as the proton to high precision. Schneider et al. used a double ion trap to determine the magnetic moment of a single trapped proton to a precision of 0.3 parts per billion. Comparatively precise measurements of the same quantity in the antiproton are now needed for a rigorous test of CPT symmetry. Science, this issue p. 1081 An optimized double–Penning trap technique improves the precision measurement of the proton magnetic moment by a factor of 11. Precise knowledge of the fundamental properties of the proton is essential for our understanding of atomic structure as well as for precise tests of fundamental symmetries. We report on a direct high-precision measurement of the magnetic moment μp of the proton in units of the nuclear magneton μN. The result, μp = 2.79284734462 (±0.00000000082) μN, has a fractional precision of 0.3 parts per billion, improves the previous best measurement by a factor of 11, and is consistent with the currently accepted value. This was achieved with the use of an optimized double–Penning trap technique. Provided a similar measurement of the antiproton magnetic moment can be performed, this result will enable a test of the fundamental symmetry between matter and antimatter in the baryonic sector at the 10−10 level.

The K1.8BR spectrometer system at J-PARC

A new spectrometer system was designed and constructed at the secondary beam line K1.8BR in the hadron hall of J-PARC to investigate

Focusing Effect of MeV Muon Beam with a Tapered Capillary Method

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J-PARC MUSE H-line optimization for the g-2 and MuHFS experiments

interactions and

Precision spectroscopy of kaonic helium-4 X-rays

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Generation of slow muon beam by laser resonant ionization of muonium atoms

-nuclear bound systems. The spectrometer consists of a high precision beam line spectrometer, a liquid

Antihydrogen Synthesis in a Double-Cusp Trap

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Physical Society of Japan : Manipulation and transport of antiprotons for an efficient production of antihydrogen atoms

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First accurate experimental study of Mu reactivity from a state-selected reactant in the gas phase: the Mu + H2{1} reaction rate at 300 K

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