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Even though there are several muon spin rotation and relaxation ($\mu$SR) studies in water/ice [1-6], recently, we report the oscillation in the zero-field spectra of muons in ice which is attributed to the spin–dipole interactions between the muon in MuOH and neighboring protons and to hyperfine transitions of triplet states of axially symmetric anisotropic muonium in ice [7]. The Mu-H distance in MuOH found to be longer than the H-H distance in H$_2$O by 5%. To deepen the understanding of interaction of muon and its species with materials, we perform $\mu$SR study in D2O in which, like in ice, we observe the axially symmetric anisotropic muonium with nearly equal hyperfine transitions at zero-field in frozen phase. In addition, distinct frequencies corresponding to diamagnetic MuOH and MuOD were observed in H$_2$O and D$_2$O, respectively. In the program, temperature- and weak field-dependent $\mu$SR study in H$_2$O and D$_2$O will be discussed.
[1] G.G. Myasishcheva, et al., Sov. Phys. JETP 26 (1968) 298.
[2] P. W. Percival, et al., Chem. Phys. Lett. 39 (1976) 333.
[3] K. Nagamine, et al., Chem. Phys. Lett. 87 (1982) 186.
[4] P. W. Percival, et al., Chem. Phys. 32 (1978) 353.
[5] P. W. Percival, et al., Chem. Phys. Lett. 93 (1982) 366.
[6] S. Cox, et al., Hyperfine Interactions 86 (1994) 747.
[7] A. D. Pant, et al., Phys. Rev. B 110 (2024) 104104.
| pant@post.kek.jp | |
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