Doppler broadening of positron annihilation radiation: fitting the coincidence spectrum

✍ Scribed by E. do Nascimento; O. Helene; C. Takiya; V.R. Vanin

• Publisher: Elsevier Science
• Year: 2005
• Tongue: English
• Weight: 577 KB
• Volume: 538
• Category: Article
• ISSN: 0168-9002
• DOI: 10.1016/j.nima.2004.09.013

✦ Synopsis

The profile of the annihilation radiation in aluminum using positrons from a 22 Na source was observed in a two-HPGe-detectors arrangement. The coincidence photon energy spectrum was fitted using a model function, accounting for both Doppler broadening and detector system response. Intensities of the thermalized positron annihilation with band, 2p, 2s, and 1s electrons, and in-flight positron annihilation were fitted. The binding energies of the 1s, 2s, and 2p electrons and the Fermi cutoff parameters of the band electrons were also fitted.