A search technique for γ-ray bands using segmented FFT analysis

A band-locator technique employing Fourier spectrum analysis has been developed for gamma -ray spectra. This is a purely mathematical routine based on frequency-space descriptions of rotational bands. The objective is to distinguish a unique spectral pattern in the presence of a multitude of other frequencies. Conversion of the band into frequency space provides a pattern, segments of which can act as a template to be extracted from the frequency spectrum of the original data set. Summing the segments reconstructs the band. When confronted with the potential presence of a completely unknown gamma -ray band within a data set, these segmented band frequencies provide useful information in locating the band. Computer experiments were designed to test the feasibility of locating superdeformed bands within gamma -ray spectra. Search results are presented for rigid-rotor bands and published superdeformed bands. (C) 2001 Elsevier Science B.V. All rights reserved.