2012 Fiscal Year Final Research Report
Investigation of the abnormally-high annihilation rate of ortho-positronium in iodomethane gas
| Project/Area Number |
23740310
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| Research Category |
Grant-in-Aid for Young Scientists (B)
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| Allocation Type | Multi-year Fund |
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| Research Field |
Atomic/Molecular/Quantum electronics
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| Research Institution | High Energy Accelerator Research Organization |
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Principal Investigator |
WADA Ken 大学共同利用機関法人高エネルギー加速器研究機構, 物質構造科学研究所, 特別助教 (10401209)
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| Project Period (FY) |
2011 – 2012
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| Keywords | 原子 / 分子 |
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| Research Abstract |
Although the mechanism of the abnormally high annihilation rate of ortho-positronium in iodomethane gas has not been revealed, a fundamental proportional relationship between the pick-off quenching cross-section and the geometrical cross section derived from the viscosity has been found for all the gaseous atoms and molecules previously reported through the study. Based on this result, a practical theory, which relates the positronium lifetime to the average size of free spaces in which positronium trapped, has been proposed.
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