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The recent attempts to extract the temperature in the late stage of medium energy (20\char21{}60 MeV/nucleon) heavy ion collisions from the yields of \ensuremath{\gamma}- and particle-instable fragments are discussed. The quantum statistical model is employed to demonstrate that feeding from instable states distorts the yields used for the temperature determination severely. Some particle instable fragments are only moderately affected by feeding. These selected species can still be useful for determining the temperature. The breakup temperatures of the fragment conglomerate extracted with this method are T\ensuremath{\simeq}4\char21{}8 MeV, much smaller than the corresponding slope factors, which indicate T\ensuremath{\sim}15 MeV.

Decay of instable Li, Be, and B fragments and the distortion of temperature measurements in heavy ion collisions