Abstract
We present a novel method for the analysis of Doppler-broadened γ-ray lineshapes observed by position-sensitive detector systems with the purpose to determine nuclear level lifetimes. This advance of the well-known Doppler-Shift Attenuation Method (DSAM) is specifically tailored to experiments employing γ-ray tracking detectors and takes advantage of the position resolution of these detector systems. The novel continuous-angle Doppler Shift Attenuation Method (caDSAM) is implemented in the comprehensive computer program APCAD for the calculation of Doppler-broadened γ-ray lineshapes, their fit to experimental data and extraction of level lifetimes. Extensions of the method qualifying it for measurements with radioactive and relativistic ion beams as well as for the measurement of “long” level lifetimes of the order of ∼200 ps are presented.Program summaryProgram Title: APCAD, StopSimProgram Files doi:http://dx.doi.org/10.17632/4hzzcvx2p7.1Licensing provisions: Creative Commons by 4.0 (CC by 4.0)Programming language: C++Supplementary material: User’s manual, installation notes, example dataNature of problem: Determination of nuclear level lifetimes from Doppler-broadened γ-ray lineshapes (DSAM)Solution method: Semi-analytical calculation of Doppler-broadened lineshapes as function of γ-ray energy and γ-ray observation angleExternal routines/libraries: ROOT, Geant4Subprograms used: CLX, DWEIKORestrictions: Only direct feeders can be considered in the current version (decay chains of length two only)Unusual features: Position resolution of γ-ray tracking detectors is exploited
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