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Experiments see surface states, but none has shown the unusual magnetic response that would identify them as Majorana.","posed_since":"2009","precise":"3He-B is a time-reversal-invariant topological superfluid (class DIII, winding number 1) with a gapless Majorana cone of surface Andreev bound states. Measure a Majorana-specific property, namely the predicted Ising-like spin response in which a magnetic field normal to the surface gaps the cone while an in-plane field does not, e.g. by surface NMR or transverse acoustic impedance in a slab with specular walls. An answer is observation or exclusion of the anisotropic surface spin response.","problem_ref":null,"references":"","settled_by":"Field-orientation-dependent measurement of the surface density of states showing gap opening only for the surface-normal field.","status_note":"Ion-mobility experiments below the free surface were interpreted as Majorana surface bound states (Ikegami and Kono, review 2019), but the field-orientation-dependent Ising spin response that would identify them as Majorana had not been demonstrated as of 2025.","title":"Direct detection of Majorana surface states in superfluid 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