A STUDY OF POSITRON PROPERTIES IN QUARTZ CRYSTALS AND SYNTHETIC SILICA GLASS

W. Anwanda, G. Brauera, M. Hasegawab, O. Derschc and F. Rauchc aInstitut für Ionenstrahlphysik und Materialforschung, Forschungszentrum Rossendorf Postfach 51 01 19, 01314 Dresden, Germany bInstitute for Materials Research, Tohoku University, Sendai 980-8577, Japan cInstitut für Kernphysik, Universität Frankfurt August-Euler-Str. 6, 60486 Frankfurt/Main, Germany

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The monoenergetic positron beamline "SPONSOR" at Rossendorf has been used to investigate the positron behaviour in a naturally grown Brasilian quartz, two synthetic quartz crystals of different origin, and synthetic silica glass. The measurements allow us to obtain the positron diffusion length of free positrons and Bloch para-positronium, if formed, in these materials. In addition, hydrothermal treatment of a synthetic quartz has been used to introduce hydrogen into the crystal up to a certain depth. The presence of hydrogen is found to influence the formation of para-positronium. The depth distribution of hydrogen has been measured independently by nuclear reaction analysis, and will be discussed in comparison with the results deduced from the positron studies.

DOI: 10.12693/APhysPolA.99.321 PACS numbers: 78.70.Bj