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Negative Muon Capture on Nitrogen Oxide Molecules
Kazuhiko Ninomiya,Takashi U. Ito,Wataru Higemoto,Makoto Kita,Atsushi Shinohara,Takashi Nagatomo,Kenya Kubo,Patrick Strasser,Naritoshi Kawamura,Koichiro Shimomura,Yasuhiro Miyake,Taichi Miura 한국물리학회 2011 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.59 No.41
The characteristic muonic X-ray measuring system for low pressure gas sample was constructed to investigate the initial process of muonic atom formation. Low background characteristic muonic X-ray spectra were obtained for neon (1.0 bar) and nitrogen mono-oxide samples (0.99 bar) by muon irradiation with 19 MeV/c. The deviation of characteristic muonic X-ray intensity patterns both for muonic nitrogen and oxygen atoms in nitrogen mono-oxide sample between our low pressure experiment and the previous high pressure experiment was found. Muon capture probability was also determined and compared with the previous work and empirical estimations.
Chang, Hun,Hwang, In-Yong,Chung, Jae-Ho,Stewart, J. Ross,Higemoto, Wataru,Miyake, Yasuhiro American Physical Society 2018 Physical Review B Vol.97 No.1
<P>We report the temperature-dependent evolution of spin ordering and excitations of the frustrated tetragonal (c >a) spinel ZnMn2O4 across the two-dimensional antiferromagnetic transition. Muon spin relaxation indicates full development of ordered magnetic moments immediately below T-N = 62.7(2) K in spite of the apparent low-dimensional ordering. Using inelastic neutron scattering, we obtained the spin Hamiltonian accounting for the temperature-dependent spin excitations. The damped spin waves at high temperature exhibit a continuous increase in their lifetime on cooling across T-N. In contrast, the finite anisotropy gap appears suddenly below T-N indicating that single-ion anisotropy stabilizes the antiferromagnetic chains. We also observed the frustrated out-of-plane exchange contributing to the high-energy modes.</P>