NATO. Dr, Wigner felt the proposed extension of exchange with the British, in this field, would still lead to only a dtluted édoperation, and asked about exchange of intelligence information on the Russian shots It was pointed out that the intelligence teams have cooperated very closely. Dr. Libby returned to a point he had raised in previous meetings of Russian U-235 ? the Committee, nanely his grave doubt that the Russians have U-235 and production facilities for it (since their diffusion plant has not been seen). Dr. Fisk argued that information not available to the GAC gives evidence of a Russian diffusion plants; and Dr, Rabi reviewed the evidence for U-235 in the Joe- shot. Dr. von Neumann observed that our general intelligence in Russia is not strong, but asked Dr. Libby to explain his real point--did he distrust our radioohemistry, did he fear a Russian miracle based on some new physical principle? .Dr. Libby said a miracle was what he feared, especially in view of Joe-5, 6, and 7. At 12:30 p.m, this session was adjourned. SECOND SESSION (November 4, 1953) At 1:30 p.m. the Committee met with Gen. Fields, Col. V. G. Huston, Wseo0n Matters Dr. N. E. Bradbury, Dr. H. F. York, and Dr. Smyth,. Mr. Murray and Mr. Campbell entered a few minutes later. present. All members of the GAC were The Secretary and Mr. Tomei were also present. | Gen. Fields reviewed the planningay Operation Ca i Castle Plans proposed schedule of shots was: mee3-1-5.; RRS « oo a “ eT, Es3-22;MR3-29; ui 1-5;RN .-15; EE - OE gy Department of Ener G| ARCHIVES ¢ Historian’s Office

Select target paragraph3