On the unfolding problem in fast neutron spectroscopy

The needs of neutron spectrometer observing recoil-proton pulse-height distribution is claimed, and the difficulties in relation to unfolding procedure are pointed out in preface. Minimum bases for understanding 'neutron spectra unfolding problem' are given in chapter 2 for the people in other fields than nuclear radiation detection. In chapter 3, some of unfolding codes properly chosen out of existing ones are briefly reviewed with short comments. In chapter 4, 'Maximun entropy principle' is outlined as a preparation for chapter 5, where the principle fully plays important role in establishing an unfolding theory which completely rejects artificial requirements and assumptions but brings physically acceptable solutions. (author)