265Our choice of statistics in the nucleus is not so arbitrary as might be thought, since it amounts primarily to a choice of normalization of P(z^).To interpret P(2 Av ) and PviZkP) further, we set s A v I) =0. Thenwhere ^D(O) is the deuteron wave function for zero separation of the neutron and proton. JPD(O) is just the probability of finding them in contact. We writeor a correlation factor divided by the nuclear volume. /= 1 would correspond to random spacing of particles in a box of nuclear volume. Using the Chew-Goldberger 23 wave function for the deuteron, we haveFor C 12 , Eq. (47) yields T = 0.28/. Choosing the 23 G. F. Chew and M. L. Goldberger, Phys. Rev. 77, 470 (1950).I N this note we shall investigate the polarization of bremsstrahlung due to electrons of energy Eo»137Z~""* mc 2 9 where Z is the atomic number of the target material. We shall then carry out analogous calculations for pairs produced by high energy, polarized Y-rays and obtain a preferred azimuth of the plane of the pairs relative to the plane of polarization. In the last part of the paper, we shall consider the effect of multiple scattering of electrons in the target upon our results for the polarization of bremsstrahlung. This note has been written in confirmation and in partial extension of previous results 1,2 obtained by using the method of virtual quanta. 3 1 G. C. Wick, Phys. Rev. 81, 467 (1951). reasonable value r~10, we have /~35.0.This would seem to indicate a reasonably strong degree of correlation in nuclear structure. Such a conclusion appears quite compatible with the evidence presented by several authors from high energy p-p scattering 24,25 for strong nuclear interactions at close distances. It is also compatible with the evidence concerning nuclear structure which was given by Chew and Goldberger 23 on the basis of York's 26 measurement of high energy (n-d) processes (see also the discussion in I on this point).The analysis of ir + absorption can be carried through in the same manner. As mentioned in Sec. II, we have reason to expect the absorption of tf+ and ir~~ mesons to be similar. 24 R. Christian and H. P. Noyes, Phys. Rev. 79, 89 (1950); R. Jastrow, Phys. Rev. 81, 165 (1951). 25 Chamberlain and Wiegand, Phys. Rev. 79, 81 (1950); Kelly, Leith, Segre\ and Wiegand, Phys. Rev. 79, 96 (1950); Chamberlain, Segre\ and Wiegand, Phys. Rev. 81, 284 (1951). 26 H. York, Phys. Rev. 75, 1467 (1949.
I. BREMSSTRAHLUNGLet us consider an electron of total energy E 0 , momentum p 0 , deflected by a nucleus of charge Ze. Let a quantum of momentum k (we take c=l from here on) be radiated at an angle $Q with the initial direction of the electron. (See Fig. 1.) After radiation, let E be the total energy and p the momentum of the deflected electron, and let its direction make an angle 0 with the direction of the emitted quantum. Call ^ the angle between the pok plane (plane of emission) and the ek plane, where e is the polarization vector of the photon; call
