where Ak are the coefficient of the Legendre polynomialsPk for the gamma transition from a completely alignedstate and the ak (J) are the attenuation coefficients Here P(m, J) is the m-substrate population (with respectto the beam axis). For heavy-ion reactions the averageorbital angular momentum brought in is much greaterthan the angular momentum carried away by the eva?porating neutrons and statistical garnrna rays.effect on alignment can be treated as a one-dimensionalrandom walk in m space and P(m, J) can be written as