Bromine and oxygen quenching of positronium in silica gel
Positron lifetime spectra for various concentrations of bromine and oxygen adsorbed on silica gel are investigated. Two-photon angnlar correlation experiments are also performed on some of these samples to investigate the quenching process of bromine and oxygen. The cross section for bromine quenching of orthopositronium in silica gel is about two orders of magnitude larger than that for oxygen quenching. The process of bromine quenching of positronium is found to be chemical quenching. Oxygen quenching of positrorium in silica gel is found to be conversion quenching. The interaction between positronium and bromine or oxygen in silica gel is found to be similar to that found in the gaseous state. The energy of Ps annihilating in the pores of silica gels is found to be 0.25 plus or minus 0.10eV. (auth)
- Research Organization:
- New England Inst., Inc., Ridgefield, Conn. (USA)
- NSA Number:
- NSA-29-016796
- OSTI ID:
- 4334340
- Report Number(s):
- COO--3373-11; CONF-730850--1
- Country of Publication:
- United States
- Language:
- English
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