Gil De Paz, ArmandoChotia, A.Marechal, E.Pedri, P.Vernac, L.Gorceix, O.Laburthe-Tolra, B.2023-06-192023-06-192013-05-311050-294710.1103/PhysRevA.87.051609https://hdl.handle.net/20.500.14352/35024© 2013 American Physical Society. LPL is Unite Mixte (UMR 7538) of CNRS and of Universite Paris 13. We acknowledge financial support from Conseil Regional d'Ile-de-France and from Ministere de l'Enseignement Superieur et de la Recherche under DIM NanoK/IFRAF and a CPER contract. A.C. thanks CNRS for financial support. We thank J.V. Porto and M. Gajda for their suggestions and their comments during the preparation of the manuscript.We study dipolar relaxation of a chromium Bose-Einstein condensate loaded into a three-dimensional (3D) optical lattice. We observe dipolar relaxation resonances when the magnetic energy released during the inelastic collision matches an excitation towards higher-energy bands. Spectroscopy of these resonances for two orientations of the magnetic field provides a 3D band spectroscopy of the lattice. The narrowest resonance is registered for the lowest excitation energy. Its line shape is sensitive to the on-site interaction energy. We use such sensitivity to probe number squeezing in a Mott insulator.engjournal articlehttp://dx.doi.org/10.1103/PhysRevA.87.051609http://journals.aps.org/open access52AtomsGasesAstrofísicaAstronomía (Física)