Paper Info
Title
AhKin: A modular and efficient code for the Doppler shift attenuation method.
Abstract
We present a set of programs for measuring lifetimes τ of nuclear states by the Doppler shift attenuation method (DSAM). The algorithms are based on the analysis of a probabilistic model of the processes occurring during a DSAM experiment. This analysis allows us to formulate the calculation of the theoretical lineshape as the application of an integral transform that converts the probability density of the cascade time (the time elapsed from nucleus creation to state decay) into the probability density of the (scaled) photon energy in the laboratory reference frame. The kernel of this integral transform, which encapsulates information related to the processes of nuclei stopping and photon detection, is independent of the state decay process, and hence needs not be recalculated on every trial of a candidate τ-value, allowing for fast computation of theoretical lineshapes. Further efficiency is gained by using algorithms that approximate continuous random variables by suitably chosen discrete ones. These codes were used to measure the lifetimes and sidefeeding times of the excited states of the normally deformed bands of 83Y (Rodriguez, et al. 2019) finding for all states good agreement between the experimental lineshape and the best-fitting theoretical one.
Year
DOI
Venue
2020
10.1016/j.cpc.2019.07.017
Computer Physics Communications
Keywords
Field
DocType
Doppler shift attenuation method,Lifetime measurement,Gamma-ray spectroscopy,Nuclear physics,Probabilistic model
Excited state,Photon,Random variable,Computational physics,Mathematical analysis,Doppler effect,Probability density function,Photon energy,Integral transform,Mathematics,Computation
Journal
Volume
ISSN
Citations 
246
0010-4655
0
PageRank 
References 
Authors
0.34
0
4
Name
Order
Citations
PageRank
Alejandro Garzón100.34
Wilmar Rodriguez200.34
Fernando Cristancho300.34
Molei Tao4165.64