A New Long-Lived Component in the Positron Lifetime Spectrum in KI at Low Temperatures

抄録

Positron lifetime spectra in KI have been measured in the temperature range between 12 K and 295 K. Large changes of the spectrum due to the transition of the ortho-positronium from a free state to a self-trapped state have been observed. A new long-lived component has been found at low temperatures and attributed to the irradiation-induced positive ion vacancy.