The stopping power and the linear energy transfer (LET) for heavy ions are outlined. The Thomas-Fermi model, which is often used for stopping power calculation, is briefly introduced. The track structure for heavy ions is discussed based on the equipartition of deposited energy between the core and the penumbra, which is a consequence of the stopping power theory. The interaction of the very slow ion and the medium are discussed as an introduction to the stopping power theory for dark matter searches. The electronic LET (LET_(el)) is introduced for the radiation effects due to high-excitation density such as quenching and sputtering in the slow-heavy-ion impact. The track structure for slow, heavy ions is evaluated by using LET__(el).
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