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Experiments on Elastic p - p Scattering in the Energy Range 120 to 345 Mev

I6_ <~~~~~~~ 4- PULSE HEIGHT IN VOLTS FIG. 2. COO single crystal spectra taken with 1i-in. diameter crystal I J in. high and an uncollimated source. The successful use of large NaI crystals and uncollimated sources is in disagreement with the results obtained by McIntyre and Hofstadter2 on single crystals but agrees with those obtained by P. R. Bell.3 Figure 2 shows an uncollimated, single-crystal spectrum of Co6w obtained with a crystal 1.5 in. in diameter and 1.5-in. high. Presumably the uniformity of the raw crystal ma- terial, surface conditions, and mounting have more effect on the resolution than does the crystal size. 1 R. Hofstadter and J. A. McIntyre, Phys. Rev. 78, 619 (1950). 2 J. A. McIntyre and R. Hofstadter, Phys. Rev. 78, 617 (1950). a P. R. Bell, Sciknce 112, 7 (1950). Erratum: Experiments on the Effect of Atomic Electrons on the Decay Constant of Be7 [Phys. Rev. 75, 39 (1949)] E. SEGRk AND C. E. WIEGAND Radiation Laboratory, Department of Physics, University of California, Berkeley, Californsa NV E have made an error in plotting, as the experimental points of Fig. 2, 25ev" instead of SeX" as indicated. Simi- larly the final value of AX/X http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Physical Review American Physical Society (APS)

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