LETTERS TO THE EDITORto a higher order of approximation, and including A/=0, 2 (yes) as well as no parity change transitions with their cross terms, energy dependence, and plane wave approximations will soon be submitted for publication. * Assisted by the joint program of the ONR and AEC. t AEC predoctoral fellow. 1 In the pseudoscalar treatment of the neutron decay the a 'CVL) term gives the same energy correction to the allowed spectrum as the rigorous relativistic matrix element, while the second term gives no contribution. The rigorous matrix element has been worked out in a paper by Yamaguchi, Umezawa, Takebe, and Koiani to appear soon; reference to previous work on the neutron decay is given there. 2 T. Ahrens and E. Feenberg, Phys. Rev. 86, 64 (1952); D. L. Pursey, Phil. Mag. 42, 1193 (1951; these references give and in the same manner it can be shown that 2Mj*0y 6 = (AaZ/2p)J % yB.
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