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Titolo:
Temperature and radiation effects on positronium formation
Autore:
Suzuki, T; Kondo, K; Hamada, E; Chen, ZQ; Ito, Y;
Indirizzi:
KEK, High Energy Accelerator Res Org, Radiat Sci Ctr, Tsukuba, Ibaraki 3050801, Japan KEK Tsukuba Ibaraki Japan 3050801 ci Ctr, Tsukuba, Ibaraki 3050801, Japan Univ Tokyo, Nucl Sci & Technol Res Ctr, Tokai, Ibaraki 3191106, Japan UnivTokyo Tokai Ibaraki Japan 3191106 Ctr, Tokai, Ibaraki 3191106, Japan Univ Tsukuba, Inst Appl Phys, Tsukuba, Ibaraki 3058573, Japan Univ Tsukuba Tsukuba Ibaraki Japan 3058573 sukuba, Ibaraki 3058573, Japan Grad Univ Adv Studies, High Energy Accelerator Res Org, KEK, Tsukuba, Ibaraki 3050801, Japan Grad Univ Adv Studies Tsukuba Ibaraki Japan 3050801 baraki 3050801, Japan
Titolo Testata:
RADIATION PHYSICS AND CHEMISTRY
fascicolo: 4-5, volume: 60, anno: 2001,
pagine: 535 - 540
SICI:
0969-806X(200103)60:4-5<535:TAREOP>2.0.ZU;2-G
Fonte:
ISI
Lingua:
ENG
Soggetto:
POLYETHYLENE; ANNIHILATION; POLYPROPYLENE; TRANSITIONS;
Keywords:
positronium; radiation effect; low temperature; radicals; polyethylene; inhibition of positronium;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
23
Recensione:
Indirizzi per estratti:
Indirizzo: Suzuki, T KEK, High Energy Accelerator Res Org, Radiat Sci Ctr, Tsukuba, Ibaraki 3050801, Japan KEK Tsukuba Ibaraki Japan 3050801 ukuba, Ibaraki 3050801, Japan
Citazione:
T. Suzuki et al., "Temperature and radiation effects on positronium formation", RADIAT PH C, 60(4-5), 2001, pp. 535-540

Abstract

During positron annihilation lifetime spectroscopy (PALS) experiments of polymers, positrons emitted from the positron source induce radiation effects in the sample. Since these radiation effects can affect positronium (Ps) formation probability, PALS has some potential to be used as a new tool to study radiation effects. As a function of the contact time of the sample with the position source, the Ps formation probability increases or decreasesat low temperature or at room temperature respectively. The decrease of the Ps formation probability at room temperature may be attributed to the accumulation of free radicals that can scavenge the electrons which could otherwise have combined with positron to form Ps. The increase at low temperatures may be attributed to the accumulation of trapped electrons that can be picked up bq positrons to form Ps. (C) 2001 Elsevier Science Ltd. All rights reserved.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 25/02/20 alle ore 10:32:12