Abstract
Liquid scintillators provide a fast, single component response. However, they traditionally have a low flashpoint and high vapor pressure. We demonstrate the use of an EJ-309 scintillator (high flashpoint and low vapor pressure variant) to acquire single-shot positron annihilation lifetime spectroscopy spectra using a trap-based positron beam.
Highlights
Positronium (Ps) is a hydrogenic atom consisting of an antimatter–matter bound state of electronic leptons
Beam-based positron annihilation lifetime spectroscopy (PALS) techniques have been developed,1,2 allowing the depth at which positrons are implanted to be varied by varying the kinetic energy of the beam
We demonstrate the use of the EJ-309 scintillator for Single-Shot Positron Annihilation Lifetime Spectroscopy (SSPALS) and comment on its use in mixed radiation environments
Summary
Positronium (Ps) is a hydrogenic atom consisting of an antimatter–matter bound state of electronic leptons. The Ps atom is unstable to annihilation with the lifetime dependent on the spin state of the atom (e.g., the ground state: 1S or p-Ps, 125 ps; 3S or o-Ps, 142 ns). The photons produced in the annihilation process encode energetic (Doppler broadening) and spin dependent (polarization) information about the electronic environment of the positron. A variety of techniques are used to obtain atomic-level information via these photons. A radioisotope source, such as 22Na, is used to provide energetic positrons (∼250 keV), which samples the bulk of a condensed phase material at depths of tens of micrometers. Beam-based PALS techniques have been developed, allowing the depth at which positrons are implanted to be varied by varying the kinetic energy of the beam
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