Question

Description acceptable. Seed particles undergo one instance of this process, and then undergo another “shot” of it in the “espresso” mechanism. An energy spectrum that obeys a negative 2.7 power law up to features called the “knee” and “ankle” is reproduced by a mechanism for this process known as DSA. The maximum obtainable energy during this process is determined using a geometry criterion developed by Anthony Hillas. In the paradigmatic mechanism for this process, particles repeatedly cross a shock front and scatter off (15[1])of turbulence on either side of the shock. Charged particles (-5[1])undergo this process as they are repeatedly (*) reflected by oscillating magnetic mirrors, as demonstrated by (-5[1])Enrico Fermi. (-5[3])This process (-5[1])must occur in the local Universe (-5[1])to exceed the GZK cutoff. For 10 points, (10[1])name this process that propels cosmic nuclei to ultrarelativistic (10[1])velocities. ■END■ (10[2]0[13])

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