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  • 1 The University of Tokyo Research Center for Nuclear Science and Technology Tokai 319-11 Ibaraki (Japan)
  • 2 Institute of Theoretical and Experimental Physics 117259 Moscow (Russia)
  • 3 El-Minia University Egypt
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Positronium formation experiments inn-hexane were performed with C2H5Br and CCl4 as inhibitors and others (decalin, tetralin, benzene, naphthalene, phenanthrene) as anti-inhibitors. Although the results can be interpreted in terms of the anti-recombination and anti-inhibition, it is necessary to consider further some new aspects of intra-spur reactions such as shallow tapping of e+ and secondary reactions of Ps. The data thus interpreted correlate excellently with the data of radiation chemistry.