  We consider a collapsing shell of matter to form the Hayward black hole and
investigate semiclassically quantum radiation from the shell. Using the
Israel's formulation, we obtain the mass relation between the collapsing shell
and the Hayward black hole. By using the functional Schr\"{o}dinger formulation
for the massless quantum radiation, the evolution of a vacuum state for a
scalar field is shown to be unitary. We find that the number of quanta at a low
frequency decreases for a large length parameter characterizing the Hayward
black hole. Moreover, in the limit of low frequency, the Hawking temperature
can be read off from the occupation number of excited states when the shell
approaches its own horizon.
