Application of a Pulsed Slow-Positron Beam to Low-Density Polyethylene Film

• Authors: E. Hamada , N. Oshima , K. Katoh , T. Suzuki , H. Kobayashi , K. Kondo , I. Kanazawa , Y. Ito
• Languages of publication: EN

Abstracts

EN

A pulsing system for a slow-positron beam was applied to study the region near the surface of low-density polyethylene film using positron-annihilation lifetime measurement. The lifetime and intensity of ortho-positronium near the surface were measured as a function of the incident positron energy (1.6-9.1 keV). The size of intermolecular spaces in the surface region (~ 1500 nm) was larger than that in the bulk region. This tendency was especially strong in the region around 200 nm below the surface. On the other hand, the intensity of ortho-positronium decreased at lower incident positron energies, which was attributed to a decrease in the density of the spur electrons and/or an increase in the number of reemitted positrons from the surface.

Keywords

EN

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)

• Publisher: Institute of Physics, Polish Academy of Sciences
• Journal: Acta Physica Polonica A
• Year: 2001
• Volume: 99
• Issue: 3-4
• Pages: 373-378

Dates

published

2001-03/04

received

2000-09-18

Contributors

author

E. Hamada

• Department of Radiological Sciences, Ibaraki Prefectural University of Health Sciences, Ami, Ibaraki 300-0394, Japan

author

N. Oshima

• Atomic Physics Laboratory, The Institute of Physical and Chemical Research (RIKEN), Wako, Saitama 351-0198, Japan

author

K. Katoh

• Department of Radiological Sciences, Ibaraki Prefectural University of Health Sciences, Ami, Ibaraki 300-0394, Japan

author

T. Suzuki

• High Energy Accelerator Research Organization (KEK), Tsukuba, Ibaraki 305-0801, Japan

author

H. Kobayashi

• High Energy Accelerator Research Organization (KEK), Tsukuba, Ibaraki 305-0801, Japan

author

K. Kondo

• High Energy Accelerator Research Organization (KEK), Tsukuba, Ibaraki 305-0801, Japan

author

I. Kanazawa

• Department of Physics, Tokyo Gakugei University, Koganei, Tokyo 184-0015, Japan

author

Y. Ito

• Research Center for Nuclear Science and Technology, The University of Tokyo, Tokai, Ibaraki 319-1106, Japan

References

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Identifiers

DOI

10.12693/APhysPolA.99.373