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Muon level crossing resonance in aluminium |
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| Authors: | S F J Cox G H Eaton D S Sivia M S Watt D W Cooke M Leon M A Paciotti J L Smith W L Hults T L Estle B Hitti C Boekema J Lam A Morrobel-Sosa R L Lichti J Oostens C Schwab E A Davis A Singh N Ayres De Campos J Ayres De Campos P J Mendes J M Gil K Chow R Duvarney P F Meier |
| Institution: | (1) Rutherford Appleton Laboratory, ISIS, Oxfordshire, UK;(2) Los Alamos National Laboratory, 87545 Los Alamos, NM, USA;(3) Rice University, 77251 Houston, TX, USA;(4) San Jose State University, 95192 San Jose, CA, USA;(5) California Polytechnic State University, 95192 San Luis Obispo, CA, USA;(6) Texas Tech University, 79409 Lubbock, TX, USA;(7) Lindsey Wilson College, 42728 Columbia, KY, USA;(8) CRN Université Louis Pasteur, Strasbourg, France;(9) Department of Physics, University of Leicester, LEI 7RH, UK;(10) Departamento de Física da Universidade, 3000 Coimbra, Portugal;(11) TRIUMF, V6T 2A3 Vancouver, BC, Canada;(12) Emory University, 30322 Atlanta, GA, USA;(13) Physik-Institut der Universität, 8057 Zürich, Switzerland |
| Abstract: | Cross relaxation between implanted positive muons and27Al 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 transfervia the 1/2  3/2 and 3/2 5/2 transitions of the (J=5/2) spins leads to a quadrupole coupling constante
2qQ/h=1.8(1) MHz,i.e. an electric field gradient on Al nuclei immediately adjacent to the muon siteq=0.048(3) a.u., with a small departure from axial symmetry. |
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