[HTML][HTML] Fast decay of 23S1 positronium atoms in an MgO lined cavity

L Gurung, TJ Babij, DB Cassidy - EPJ Techniques and Instrumentation, 2021 - Springer
L Gurung, TJ Babij, DB Cassidy
EPJ Techniques and Instrumentation, 2021Springer
We report experiments in which radiatively metastable $2\,^{3}\mathrm {S} _ {1} $
positronium (Ps) atoms entered a waveguide whose internal surfaces were lined with
smoked magnesium oxide (MgO) powder. The waveguide was built such that time-delayed
microwave radiation pulses, tuned to drive $2\,^{3}\mathrm {S} _ {1}\rightarrow
2\,^{3}\mathrm {P} _ {2} $ transitions, could be applied to the Ps ensemble. The lifetime of
$2\,^{3}\mathrm {S} _ {1} $ atoms was measured using time-delayed microwave induced …
We report experiments in which radiatively metastable positronium (Ps) atoms entered a waveguide whose internal surfaces were lined with smoked magnesium oxide (MgO) powder. The waveguide was built such that time-delayed microwave radiation pulses, tuned to drive transitions, could be applied to the Ps ensemble. The lifetime of atoms was measured using time-delayed microwave induced decay, yielding ≈200 ns. This is considerably shorter than the Zeeman shifted lifetime of 1070 ns, indicating that Ps atoms in the state do not survive multiple collisions with MgO nanocrystals.
Springer
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