Cosmic-Ray Positron and Antiproton Fractions measured with PAMELA

Adopted from Adriani et al. (2009), Letters to Nature, v. 458, p. 607.
PAMELA positron fraction with other experimental data and with secondary production model. The positron fraction measured by the PAMELA experiment compared with other recent experimental data. Error bars show 1 s.d.; if not visible, they lie inside the data points.


Adopted from Boezio et al. (2012), Hyperfine Interactions, v. 213, p. 147
Left panel: The PAMELA positron fraction (e+/(e++e-)) [1] compared with other experimental data [13 - 20] and with predictions of a secondary production model (solid line) [21].
Right panel: The PAMELA electron (e-) spectrum [3] compared with recent electron and electron plus positron (e++e-) data [17, 22 - 30].


Adopted from Boezio et al. (2012), Hyperfine Interactions, v. 213, p. 147
The antiproton stectrum (left) and antiproton-to-proton flux ratio (right) measured by PAMELA [2], compared with data from other contemporary experiments [4 - 9] and theoretical calculations for purely secondary production of antiprotons in the Galaxy [10 - 12].

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