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Muon level crossing resonance in aluminium

Authors: S. F. J. Cox, G. H. Eaton, D. S. Sivia, R. L. Lichti, E. A. Davies,N. Ayres de Campos, J. Ayres de Campos, P. J. Mendes, J. M. Gil, K. Chow, et al.

Ref.: Hyperfine Int. 85, 59-65 (1994)

Abstract: Cross relaxation between implanted positive muons and Al-27 nuclei in Al metal, lightly doped with Cu to impede the muon diffusion, shows weak resonances at 2.3 and 4.0 mT. Assignment of these to polarization transfer via the 1/2 <-> 3/2 and 3/2 <-> 5/2 transitions of the (J = 5/2) spins leads to a quadrupole coupling constant e2qQ/h = 1.8(1) MHz, i.e. an electric field gradient on Al nuclei immediately adjacent to the muon site q = 0.048(3) a.u., with a small departure from axial symmetry.

DOI: 10.1007/BF02069402