Positron lifetime distributions in fluids

Bruce N. Miller, Terrence L. Reese, Gregory Alan Worrell

Research output: Contribution to journalArticle

10 Citations (Scopus)

Abstract

Experimental studies of positron and positronium decay in dense fluids suggest that these particles are capable of forming self-trapped states in some fluids in a broad region of temperature and density surrounding the liquid-vapor critical point. A central question in understanding the phenomena is whether the light particle (lp) actively creates a static potential well in the fluid in which it localizes, or randomly visits favorable fluctuations. The fact that the experimental measurements yield a single, well-defined decay rate for each decay mode suggests that the environment of the lp is static. Earlier mean-field theories could not shed much light on this question. However, two recent applications of quantum Monte Carlo methods show that substantial fluctuations occur in the lp environment. In this paper, the distribution of fluctuations is described. It is shown that the apparent conflict is resolved if the time scale for fluctuations in the environment is much shorter than the duration of each measurement, and estimates for the different relaxation processes are provided.

Original languageEnglish (US)
Pages (from-to)4083-4087
Number of pages5
JournalPhysical Review E
Volume47
Issue number6
DOIs
StatePublished - Jan 1 1993
Externally publishedYes

Fingerprint

Lifetime Distribution
positrons
Fluctuations
Fluid
life (durability)
fluids
Decay
Quantum Monte Carlo
Potential Well
Mean-field Theory
positronium
decay
Decay Rate
Monte Carlo method
decay rates
Well-defined
Experimental Study
Critical point
critical point
Time Scales

ASJC Scopus subject areas

  • Statistical and Nonlinear Physics
  • Mathematical Physics
  • Condensed Matter Physics
  • Physics and Astronomy(all)

Cite this

Positron lifetime distributions in fluids. / Miller, Bruce N.; Reese, Terrence L.; Worrell, Gregory Alan.

In: Physical Review E, Vol. 47, No. 6, 01.01.1993, p. 4083-4087.

Research output: Contribution to journalArticle

Miller, Bruce N. ; Reese, Terrence L. ; Worrell, Gregory Alan. / Positron lifetime distributions in fluids. In: Physical Review E. 1993 ; Vol. 47, No. 6. pp. 4083-4087.
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