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In the framework of swift heavy ion - matter interaction, the thermal spikehas proved its worth since nearly two decades. This paper deals with thenecessary refinement of the computation due to the kind of materials involvedi.e. nanomaterials such as multilayered systems or composite films constituedof nanocylinders or nanospheres embedded in matrix. The three dimensionalcomputation of the thermal spike model is applied for the first time in layerscontaining spherical nanoparticles embedded in a silica matrix. The temperatureprofile calculated at each point (x,y,z) of the target for times up to$10^{-10}$s allows a possible explanation of the particle shape change underirradiation with swift heavy ions having an energy of several MeV/u.m.a. Thecomparison made with the former 2D version of the code applied to cylindricalgold nanoparticles confirms the validity of the present 3D version.

Ion-matter interaction: the three dimensional version of the thermal spike model. Application to nanoparticle irradiation with swift heavy ions