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Titolo:
Pressure quenching of positronium in solid biphenyl
Autore:
Goworek, T; Suzuki, T; Hamada, E; Kondo, K; Ito, Y;
Indirizzi:
KEK, High Energy Accelerator Org, Radiat Sci Ctr, Tsukuba, Ibaraki 305, Japan KEK Tsukuba Ibaraki Japan 305 Radiat Sci Ctr, Tsukuba, Ibaraki 305, Japan Grad Univ Adv Studies, Dept Accelerator Sci, Tsukuba, Ibaraki 305, Japan Grad Univ Adv Studies Tsukuba Ibaraki Japan 305 ukuba, Ibaraki 305, Japan Univ Tokyo, Nucl Sci & Technol Res Ctr, Tokai, Ibaraki 31911, Japan Univ Tokyo Tokai Ibaraki Japan 31911 Res Ctr, Tokai, Ibaraki 31911, Japan
Titolo Testata:
CHEMICAL PHYSICS
fascicolo: 2-3, volume: 255, anno: 2000,
pagine: 347 - 351
SICI:
0301-0104(20000501)255:2-3<347:PQOPIS>2.0.ZU;2-J
Fonte:
ISI
Lingua:
ENG
Soggetto:
TEMPERATURE-DEPENDENCE; ANNIHILATION; LIFETIMES; PROGRAM;
Keywords:
positronium; high pressures; biphenyl;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
14
Recensione:
Indirizzi per estratti:
Indirizzo: Goworek, T Marie Curie Sklodowska Univ, Inst Phys, Pl M Curie Sklodowskiej1, PL-20031 Lublin, Poland Marie Curie Sklodowska Univ Pl M Curie Sklodowskiej 1 Lublin Poland PL-20031
Citazione:
T. Goworek et al., "Pressure quenching of positronium in solid biphenyl", CHEM PHYS, 255(2-3), 2000, pp. 347-351

Abstract

In solid crystalline biphenyl, ortho-positronium (o-Ps), abundant at normal pressure, can be eliminated by application of a pressure of about 100 MPa. The lifetime of o-Ps shortens with the rise of pressure, as a result of diminishing of the free spaces in which it is trapped. However, the lifetimeof para-Ps seems to increase, and at 80 MPa, it cannot be distinguished from that of free positrons. Another new effect is the reappearance of the long-lived component in the positron lifetime spectrum at high pressures. Thesame effect of positronium reappearance, although not so well pronounced, was found in biphenyl at low temperatures. (C) 2000 Published by Elsevier Science B.V. All rights reserved.

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Documento generato il 30/03/20 alle ore 09:57:53