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1. Lifspecfit
Author: Martti Puska

Small program for the decomposition of life-time spectra.
Main features: DOS interface; separate configuration file; input spectrum must contain 400 channels; single Gaussian is used for fitting of the resolution function.

2. LT
Author: J. Kansy

The LT program [J.Kansy, Nucl.Instr&Meth A374 (1996) 235] has been designed in the DELPHI programming language. The program uses the WINDOWS framework, so it possesses standard appearance and provides familiar operating system.
Main features:

· Unconstrained number of channels in a spectrum

· Possibility to fit FWHM by several Gaussians

· Analysis with the help of different Trapping Models

· Descrete or continuous lifetime components

For more details see the LT description file (rtf format).

Author: A. Shukla

MELTV4.0 ( may be having some bugs. Those who modified and fixed bugs are requested to send us the corrected version )

Author: R.B.Gregory
Manual & Reference

MELT and CONTIN - are programs for the analysis of positron lifetime spectra. In particular, the programs are useful when not discrete lifetimes are expected, but a continuous distribution of lifetimes. This is typical for positron lifetime spectroscopy in polymers and porous materials

Original CONTIN Author :
 S.W. Provencher 

5. PALSfit
Authors: Kirkegaard, Peter; Olsen, Jens V.; Eldrup, Morten Mostgaard; Pedersen, Niels Jørgen

 Type: Report
Publisher version   ( version 1.
Access to all.   Size: 997 KB )

A computer program for analysing positron lifetime spectra. - Roskilde : Forskningscenter Risø, 2009 (p. 44)
In: Risø-R-1652(EN)

More information on the web site :


6. PAScual
Author: Carlos Pascual-Izarra



PAScual is a data analysis suite for Positron Annihilation Lifetime Spectroscopy (PALS).

1. Vepfit
Author: Henk Schut
To obtain contact: Dr. Henk Schut

Analysis of defects depth profiling using energy-variable continuous beam of slow positrons.

2. SP
Author: Jerzy Dryzek

With this program, S- and W-parameters can be calculated. The 511 keV position is determined with the help of a Gaussian fit to experimental data after background reduction.
For support, please, refer to the author homepage:

3. MePASTo

The program MePASto was developed to facilitate the data reduction and data analysis of Coincidence Doppler Broadening (CDB) spectra. The spectrum is a function of two energies (sampled by detector 0 and detector 1) and can be displayed as a two-dimensional plot. Main problem in data reduction is to find the axis, which represents the coincident events, and to make the data along this axis available for further analysis.
For support, please, refer to the authors homepage:

4. PosScope 1.2
Author: Vladimir Bondarenko

The PosScope is a software tool designed for graphical representation and analysis of positron lifetime and Doppler broadening spectra. The analysis of Doppler spectra includes iterative procedure of background subtraction and numerical integration for the determination of S and W form parameters.
Moreover, PosScope implements a Monte Carlo algorithm for simulation of positron lifetime spectra. The algorithm is similar to the one used in the
lt_sim program (see the Simulation section).
For more details see the programm documentation.

Author: Alexander Fedorov

· Analysis of the positron annihilation spectra (Doppler Broadening Technique) is often performed in terms of so-called S and W parameters. By definition the S- parameter is proportional to the contribution of the central part of the gamma spectrum and is ascribed to annihilation events with low momentum electrons (valence or conduction electrons). The W- parameter is related to the "wings" of the peak and is ascribed to annihilations with high momentum core electrons, which provide a considerable Doppler shift. By mapping the experimental points in the S-W plane with the positron energy as the running parameter, the cluster points characteristic for the layers or defects can be derived. The program SWAN (S-W ANalysis) is developed to trace these cluster points and to calculate the fractions of the positrons annihilated at the layers or defects ascribed to the cluster points.

The download package includes the following files:
swan06.exe - executable, runs under Windows (after the first run the program creates a config file swan.cnf);

· Swan report manual.pdf - user manual;

· Swan report model.pdf - description of the model;

· number of examples of the SW-spectra in *.csv files.

1. lt_sim
Author: S. Eichler

Simulation of positron lifetime spectra.
Main features: based on Monte-Carlo (MC) method; DOS interface; separate configuration file.
Simulated spectrum may consist of several lifetime components, which might be either discreet values or represented by a Gaussian distribution. Resolution function can be simulated either by a sum of Gaussians (up to 3) or by two exponents (for the left and right side of the spectrum).

2. PosBunch
Author: Vladimir Bondarenko

PosBunch (Positron Bunch) is a Monte Carlo simulation code for designing a pulsed positron beam. The programme was developed in framework of the EPOS (ELBE POsitron Source) Project (see http://www.positronannihilation.net/EPOS/). Therefore the EPOS beam line underlines the programming concept of PosBunch, i.e. the construction elements foreseen in EPOS were programmed as PosBunch tools. These are two harmonic bunchers, two choppers and three accelerators.
PosBunch allows easy construction of a positron beam line from the tools mentioned above, uses realistic Monte Carlo simulations of the time and energy structure of the beam and provides an easy-to-read graphical output of the simulation results for convenient optimization of the beam parameters.
For further details see the programm documentation.

3. MIKA Doppler

Download: Size: 11.7 MB

A program to model positron states and annihilation in solids ( in linux platform ).