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The system of bose liquid + impurity is considered. The energy spectrum,\ud as well as effective mass of impurity is calculated. For the case of an ³He\ud atom in superfluid <⁴He numerical calculations are performed.Розглядається система “бозе-рідина + домішка”. Розраховано енергетичний спектр домішки та її ефективну масу. Проведено числові розрахунки для випадку атома ³He в рідкому ⁴He

IMPURITY EFFECTIVE MASS IN SUPERFLUID ^{4}He