Measuring entry distributions with and unfolding spectra from detector arrays

For escape-suppressed detector arrays such as Gamma-sphere, techniques have been developed to unfold spectra and, thus, to extract the true quasi-continuum of gamma rays emitted in fusion evaporation reactions. This makes it possible to perform quasi-continuum spectroscopy at very high spins and finite temperatures (known as QC and Ridge spectroscopy). Furthermore, by removing the heavimet (high tungsten alloy) shields from the BGO Compton suppressors of Gamma-sphere, it is possible to directly determine entry distributions for heavy ion reactions using the spectrometer as a calorimeter. With the advent of tracking detector arrays, it should be possible to measure the quasi-continuum of gamma rays as well as entry distributions with superior precision. However, the techniques for doing so are significantly more elaborate. We will propose some new techniques and discuss the first results from the unfolding of an ¹⁵²Eu spectrum measured in a tracking array. This document is composed of an abstract and the slides of the presentation. (authors)