A novel digital pulse-shape analysis for high-resolution position-sensitive Gamma-ray spectroscopy

A novel digital pulse-shape analysis (DPSA) was performed for high-resolution position-sensitive gamma-ray spectroscopy with coaxial-type high-purity germanium (HpGe) detectors. The DPSA consisted of two stages that determined the pulse height, the interaction point, and the time by using the chi-square fitting the digitally recorded pulse shapes with calculated shapes. As the DPSA was applied to gamma-ray spectroscopy using HpGe coaxial detectors, we obtained the energy spectra, the time-difference spectra, and the interaction depth profiles for the gamma rays emitted from ¹³³Ba and ²²Na standard sources. The efficacy of the spectroscopic analysis using the DPSA was compared with that using a conventional analog signal process (CASP). Furthermore, we determined the half-lifetime of the 1^st excited state in ¹³³Cs by using the DPSA.