Figure 2: Positron spectra.
From: Generation of neutral and high-density electron–positron pair plasmas in the laboratory
Measured positron spectra, as resulting from the average over five consecutive shots, (solid lines) compared with that obtained from FLUKA simulations (dashed lines) for d=5 mm (a), d=2 cm (b) and d=4 cm (c). In this latter case, also the spectrum of the electrons escaping the target is plotted. Its similarity with the positron spectrum is a clear indication of the generation of a neutral electron–positron pair beam. The inset in a shows the simulated positron spectrum at low energy for d=5 mm, indicating a Jüttner–Synge distribution.
