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We performed high resolution diffraction and inelastic neutron scatteringmeasurements of Mn_{12}-acetate. Using a very high energy resolution, we couldseparate the energy levels corresponding to the splitting of the lowest Smultiplet. Data were analyzed within a single spin model (S=10 ground state),using a spin Hamiltonian with parameters up to 4^{th} order.  The non regular spacing of the transition energies unambiguously shows thepresence of high order terms in the anisotropy (D= -0.457(2) cm^{-1}, B_4^0 =-2.33(4) 10^{-5}cm^{-1}).  The relative intensity of the lowest energy peaks is very sensitive to thesmall transverse term, supposed to be mainly responsible for quantum tunneling.  This allows an accurate determination of this term in zero magnetic field(B_4^4 = \pm 3.0(5) 10^{-5} cm^{-1}). The neutron results are discussed in viewof recent experiments and theories.Comment: 4 pages ? 3 figures, submitted to Physical Review Lette

physical review letters

Low-Energy Magnetic Excitations of the<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi>Mn</mml:mi></mml:mrow><mml:mrow><mml:mn>12</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>-Acetate Spin Cluster Observed by Neutron Scattering

Low-Energy Magnetic Excitations of theMn12-Acetate Spin Cluster Observed by Neutron Scattering