It might be possible that thermodynamic properties of nuclear matter, such
as the caloric curve, could be obtained from heavy-ion reactions. Recent ex
perimental and computational studies of nuclear experiments have obtained c
ontradictory caloric curves for nuclear matter. This work improves on previ
ous theoretical studies by considering the fragmentation produced by collis
ions, and introducing the methodology needed to identify the fragments, the
ir temperature, energy, and a caloric curve. The main findings are the cruc
ial reduction of energy produced in the promptly emitted particles, the exi
stence of a well-defined fragmentation time, the connection of the temperat
ure of the detected fragments with that at fragmentation time, and the poss
ibility of obtaining the caloric curve from collisions.