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The ground state tunnel splitting for the biaxial spin model in the magneticfield, H = -D S_{x}^2 + E S_{z}^2 - g \mu_B S_z H_z, has been investigatedusing an instanton approach. We find a new type of spin instanton and a newquantum interference phenomenon associated with it: at a certain field, H_2 =2SE^{1/2}(D+E)^{1/2}/(g \mu_B), the dependence of the tunneling splitting onthe field switches from oscillations to a monotonic growth. The predictions ofthe theory can be tested in Fe_8 molecular nanomagnets.Comment: 7 pages, minor changes, published in EP

Non-Kramers freezing and unfreezing of tunneling in the biaxial spin model