Incorporation of the Magnetic Quenching Effect into the Blob Model of Ps Formation. Finite Sized Ps in a Potential Well

Степанов, С. В.; Zvezhinskiy, Dmitry; Duplâtre, G.; Byakov, V. M.; Batskikh, Yuliya Yu.; Stepanov, P. S.

doi:10.4028/www.scientific.net/msf.666.109

Cited by 13 publications

(19 citation statements)

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“…13. It is somewhat higher than the experimental values (0.65-0.75 [28]). This discrepancy may indicate that e + and e − really interact with a medium in a different way, for example, V − 0 > V + 0 .…”

Section: Discussion On the Non-point-ps Approximationcontrasting

confidence: 66%

Positronium in a Liquid Phase: Formation, Bubble State and Chemical Reactions

Степанов

Byakov

Zvezhinskiy

et al. 2012

Advances in Physical Chemistry

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This chapter reviews the following items: 1. Energy deposition and track structure of fast positrons: ionization slowing down, number of ion-electron pairs, typical sizes, thermalization, electrostatic interaction between e + and its blob, effect of local heating;2. Positronium formation in condensed media: the Ore model, quasifree Ps state, intratrack mechanism of Ps formation;3. Fast intratrack diffusion-controlled reactions: Ps oxidation and ortho-para conversion by radiolytic products, reaction rate constants, interpretation of the PAL spectra in water at different temperatures; 4. Ps bubble models. "Non-point" positronium: wave function, energy contributions, relationship between the pick-off annihilation rate and the bubble radius.

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Section: Discussion On the Non-point-ps Approximationcontrasting

confidence: 66%

Positronium in a Liquid Phase: Formation, Bubble State and Chemical Reactions

Степанов

Byakov

Zvezhinskiy

et al. 2012

Advances in Physical Chemistry

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“…see [6]), that was not xed because we were unable to nd its value for glycerol in the available literature. …”

Section: Resultsmentioning

confidence: 99%

“…The collective t of three theoretical models (5), (7), (6) to corresponding experimental data resulted in a set of obtained model parameters, that are discussed in this section. As a reference data for comparison with new results, we used a 3-exponential decomposition of lifetime spectra measured by Duplâtre and reported in [5].…”

Section: Resultsmentioning

confidence: 99%

The Evidence of Quasi-Free Positronium State in GiPS-AMOC Spectra of Glycerol

et al. 2014

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We present the results of processing of age-momentum correlation spectra that were measured for glycerol by the gamma-induced positron spectroscopy facility. Our research has shown that the shape of experimental s(t) curve cannot be explained without introduction of the intermediate state of positronium (Ps), called quasi-free Ps. This state yields the wide Doppler line near zero lifetimes. We discuss the possible properties of this intermediate Ps state from the viewpoint of developed model. The amount of annihilation events produced by quasi-free Ps is estimated to be less than 5% of total annihilations. In the proposed model, quasi-free Ps serves as a precursor for trapped Ps of para -and ortho -states.

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“…An exception is water: in spite of decreasing surface tension the o-Ps lifetime also decreases [139,140]. Stepanov et al [141] propose to explain this behaviour as the effect of exponential increase of the rate constant of the Ps oxidation reaction by intratrack OH radicals and H 3 O + ions. In the cases described above, the pressure over the liquid sample was produced by own saturated vapour, always well below the atmospheric one.…”

Section: Molten Alkanes and Alcoholsmentioning

confidence: 99%