Discrete and Continuous Analysis of Positron Lifetime Spectra: a Comparison

• Authors: G. Consolati , F. Quasso
• Languages of publication: EN

Abstracts

EN

Positron lifetime spectra in poly[1-(trimethylsilyl)]propine membranes were collected at different temperatures and various number of accumulated counts, in order to compare the results from analyses obtained by different decay models: discrete (that is, purely exponential) or continuous (with at least one distribution of lifetimes). Analysis into four discrete components is inadequate, unless a low number of counts (1 to 2 millions) is accumulated. Conversely, deconvolutions which allow the ortho-positronium lifetime to be distributed give satisfactory fits, even at the highest statistics (60 millions). An equivalent good fit in terms of χ^{2} test is obtained with a five discrete components analysis, from which it is possible to extract information on the first moments (centroid and standard deviation) of ortho -positronium lifetime distribution.

Keywords

EN

36.10.Dr; 71.60.+z; 78.70.Bj

Discipline

• 78.70.Bj: Positron annihilation(for positron states, see 71.60.+z in electronic structure of bulk materials; for positronium chemistry, see 82.30.Gg in physical chemistry and chemical physics)
• 71.60.+z: Positron states(for positron annihilation, see 78.70.Bj)
• 36.10.Dr: Positronium(see also 82.30.Gg Positronium chemistry)

• Journal: Acta Physica Polonica A
• Year: 1999
• Volume: 95
• Issue: 4
• Pages: 505-508

Dates

published

1999-04

Contributors

author

G. Consolati

• Dipartimento di Fisica and Istituto Nazionale per la Fisica della Materia, Politecnico di Milano, Piazza Leonardo da Vinci 32, 20133 Milano, Italy

author

F. Quasso

• Dipartimento di Fisica and Istituto Nazionale per la Fisica della Materia, Politecnico di Milano, Piazza Leonardo da Vinci 32, 20133 Milano, Italy

Identifiers

DOI

10.12693/APhysPolA.95.505