Abstract: We study the localization length of few interacting particles in a random potential. Concentrating on the case of three particles we show that their localization length is strongly enhanced comparing to the enhancement for two interacting particles. PACS. 72.15Rn- Quantum localization PACS. 71.30+h- Metal-insulator transition 1 Recently it had been shown that in a random potential two repulsing/attracting particles can propagate coherently on a distance lc which is much larger than one particle localization length l1 in absence of interaction . In some sense interaction destroys quantum interference which leads to one-particle localization and creates an effective pair of two particles of size l1 propagating on a large distance. For better understanding of this result Imry developped  a scaling block picture of localization for interacting particles which can be applied in principle for a larger number of particles and higher dimensions. Intensive numerical investigations of Pichard and coworkers  and von Oppen and coworkers  confirmed the existence of the two interacting particles (TIP) effect. While some additional checks are still required the results [3, 4] definitely show that i
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