(assuming non-relativistic particles). Thus for small Po or long times it is expected that the rollover rigidity will increase proportionally with time (with only a weak dependence on Po), and the rollover energy to increase as t . Note that for the above case of constant X the rollover velocity (vc) and kinetic energy per nucleon
(Efc/A) are independent of Q/A. For the more general case of A ^ Pa it can be shown that
Pc pa+1 + 4 (a+ 1) A mpc ujcostj - «2 cos 02 3 Q e cos0
or for late times.
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