2735. “Truman said . . . kids”: quoted in Herken (1980), p. 11.
2736. “Provided there . . . August”: LRG to Chief of Staff, Aug. 10, 1945. MED 5B.
2737. “It was . . . now?”: quoted in Scott-Stokes (1974), p. 109.
2738. “placing . . . officials”: quoted in Bernstein (1977), p. 13.
2739. “I have . . . unusual”: quoted in ibid., p. 15ff.
2740. “a plan . . . attack”: quoted in Feis (1966), p. 205.
2741. “evidence of . . . ancestors?”: quoted in ibid., p. 208.
2742. “the . . . placed”: quoted in Bernstein (1977), p. 13.
2743. “Flash! . . . soon”: quoted in Feis (1966), p. 209n.
2744. “Despite the . . . generation”: quoted in ibid., p. 248.
2745. “If it . . . mad”: quoted in Scott-Stokes (1974), p. 109.
2746. “An atomic . . . slaughter”: Committee (1977), p. 335.
2747. “By the . . . identity”: Elliot (1972), p. 138ff.
2748. “The experience . . . mankind”: Committee (1977), p. 340.
2749. “The night . . . pounding”: Hachiya (1955), p. 114ff.
1 Nagaoka indicates indirectly that the visit took place sometime prior to July 1910—after Marsden’s 1909 discovery and before Rutherford’s announcement to Geiger at Christmastime 1910 that he had worked out an explanation.
1 George Gamow had proposed such a model in Copenhagen in 1928. Bohr credited it to Gamow at the October 1933 Solvay conference, as did Heisenberg. Bohr and his student Fritz Kalkar subsequently developed the model and physicists customarily attribute it to him.
1 Fractionation—fractional crystallization—was a technique of chemical analysis pioneered by Marie Curie in the course of purifying polonium and radium. Most substances are more soluble at a high temperature than a low. Make a strong boiling solution of a substance—for rock candy, for example, sugar in water—cool the solution, and at some point the substance will emerge out of solution to form pure crystals. Fractional crystallization further involves separating out of the same solution several different, chemically similar substances by taking advantage of their tendency to crystallize at different temperatures according to differences in their atomic weights, lighter elements crystallizing first.
1 The distinction between U235 and U238 had already fired a debate. “Fermi and a number of others,” says John Dunning, “had considerable doubts about U-235 or even disagreed—they thought it was U-238 [that was responsible for slow-neutron fission].” The disagreement incensed Bohr, who told Lèon Rosenfeld he was “outraged” that Fermi should question the logic of his argument that thorium and U238 stood on one side and U235 on the other.1106 “It was both the strength and the weakness of Fermi,” writes Rosenfeld, “to be so intent on following his own lines of thought that he was impervious to any outside influence. . . . He fancied there could be a different interpretation of the evidence discussed by Bohr, and that only experiment could decide.” Dunning, on the other hand, “immediately accepted Bohr’s argument.”1107 The important outcome was that Dunning began to think of isotope separation, while Fermi continued to pursue the possibility of a chain reaction in natural uranium. With unusual and uncharacteristically Fermian conservatism, so did Szilard.
1 Although Bohr had speculated many years earlier that the transuranic elements, if any, would probably be chemically similar to uranium, researchers still commonly assumed that the transuranics would be chemically similar to the series of metals in the periodic table that begins with rhenium and osmium and includes platinum and gold. “Eka” is an old prefix meaning “beyond.”
1 Compton’s memory errs toward more optimism than Fermi’s calculations warranted. After Compton’s visit Gregory Breit, Briggs’ theoretician on the Uranium Committee, asked Fermi to work his formulae on paper. Fermi was busy with his uranium-graphite experiment and produced, on October 6, a sketchy set of notes. He guessed at the cross sections and came up with 130,000 grams—287 pounds. “One cannot,” he added, “in my opinion, exclude the possibility that [the critical mass] may be as low as 20,000 grams [44 pounds] or as high as one or more tons.”1486
1 The proximity fuse was a miniature radar unit shaped to replace the ballistic nose of anti-aircraft shells. It sensed its proximity to a target—an enemy plane—and exploded the shell it rode at a preset range, often turning a miss into a kill. Its development was another of Bush’s responsibilities and it was one of science’s most important contributions to the war. Merle Tuve, Richard Roberts1108 and most of the physics team at the Department of Terrestrial Magnetism of the Carnegie Institution had turned from fission research in August 1940 to develop it.1842
1 Spontaneous fission, a relatively rare nuclear event, differs from fission caused by neutron bombardment; it occurs without outside stimulus as a natural consequence of the instability of heavy nuclei.
1 A betatron accelerates electrons to high speeds in a magnetic field; such beta ray-like electrons can then be directed onto a target to produce intense beams of high-energy X rays.
1 “The glory is departed.”
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