On April 14, 1938, at 2:30 p.m.907, your six cigars were irradiated with 100 kv., a filter focus distance of 20 cm. with ten minutes in front and ten minutes over the back of each cigar. This gave them 1000 r. in front and 1500 r. in back of each cigar.
I hope that your friend finds the taste unchanged.
Szilard also bought pork from a meat market on Amsterdam Avenue, saving the receipt, and arranged its irradiation to see if X rays might kill the parasitic worm of trichinosis. He even dispatched his brother Béla to Chicago to discuss the matter with Swift & Company, which reported it had in fact made similar experiments of its own.
The surge-generator project developed through the year, incidentally giving Strauss the opportunity to meet Ernest Lawrence, who dropped by to pitch the new sixty-inch cyclotron he was building—the pole pieces were sixty inches across, but the magnet would weigh nearly two hundred tons. Lawrence and his brother John, a physician, had arrested their mother’s cancer with accelerator radiation and intended to use the big cyclotron to further that research. Strauss remained loyal to the surge generator.
Segrè encountered Strauss’s Hungarian wizard in New York that summer. The elegant Italian was professor of physics at Palermo by then, married to a German woman who had fled Breslau to escape the Nazis, with a young son:
I left Palermo with a return ticket, and I arrived in New York.908 I met Szilard. “Oh, what are you doing here?” He was a good friend of mine. I knew him quite well. “What are you doing here? What’s going on?”
I said, “I’m going to Berkeley to look at the short-lived isotopes of element 43,” which was my plan. “I’ll work there the summer, and then I’ll go back to Palermo.”
He said, “You are not going back to Palermo. By this fall, God knows what will happen! You can’t go back.”
I said, “Well, I have a return ticket. Let’s hope for the best.”
But I had gotten a passport for my wife and my son before leaving, because I smelled that the situation was dangerous. So I took the train in New York, Grand Central, and I bought the newspaper in Chicago. I still remember it. I will remember it as long as I live. I opened the newspaper, and I found out that Mussolini had started the antisemitic campaign and had fired everybody. So there I was. So I had the ticket and went to Berkeley. I started to work on my short-lived isotopes of technetium, but at the same time I tried to get some job. Then I got my wife here.
The pall of racism had dropped over Italy.
* * *
The physicists at the institute on Via Panisperna had been alert to the darkening Italian prospect since at least the mid-1930s. Segrè remembers asking Fermi in the spring of 1935 why the group’s mood seemed less happy. Fermi suggested he look for an answer on the big table in the center of the institute reading room. Segrè did and found a world atlas there. He picked it up; it fell open automatically to a map of Ethiopia, which Italy in a show of Fascist bravado was about to invade.909 By the time the invasion began all but Amaldi were examining their options.
Fermi went off to the University of Michigan’s summer school in Ann Arbor, renewing an affiliation he had begun with Laura in the summer of 1930. He liked America. “He was attracted,” Segrè notes with an ear for Fermi’s priorities, “by the well-equipped laboratories, the eagerness he sensed in the new generation of American physicists, and the cordial reception he enjoyed in academic circles. Mechanical proficiency and practical gadgets in America counterbalanced to an extent the beauty of Italy. American political life and political ideals were immeasurably superior to fascism.”910 Fermi swam in Michigan’s cool lakes and learned to enjoy American cooking. But the pressure of events in Italy was not yet sufficiently extreme, and Laura, Roman to her fine bones, was more than reluctant to leave the city of plane trees and classical ruins where she was born. Nor was anti-Semitism yet an issue in Italy—Mussolini had even declared he did not propose to make it one.
There was less to hold the other men. Rasetti summered at Columbia University that year, 1935, and decided to stay on. Segrè had shifted to Palermo but began looking toward Berkeley. Pontecorvo moved to Paris. D’Agostino went to work for the Italian National Research Council. Amaldi and Fermi pushed on alone, Amaldi remembers, Fermi even jettisoning his daily routine for the distraction of experiment:
We worked with incredible stubbornness. We would begin at eight in the morning and take measurements [they were examining the unaccountably differing absorption of neutrons by different elements], almost without a break, until six or seven in the evening, and often later. The measurements . . . were repeated every three or four minutes, according to need, and for hours and hours for as many successive days as were necessary to reach a conclusion on a particular point. Having solved one problem, we immediately attacked another. . . . “Physics as soma” was our description of the work we performed while the general situation in Italy grew more and more bleak, first as a result of the Ethiopian campaign and then as Italy took part in the Spanish Civil War.911
Fermi taught a summer course in thermodynamics at Columbia University in 1936 as the civil war began in Spain that would last three years, claim a million lives and set Mussolini decisively at Hitler’s side. The following January Corbino died unexpectedly of pneumonia at sixty-one and the hostile occupant at the north end of the institute’s second floor, Antonino Lo Sordo, a good Fascist, was appointed to succeed him. “That was a sign that Fermi’s fortunes were declining in Italy,” Segrè notes.912 “America,” he concludes of those depressing years, “looked like the land of the future, separated by an ocean from the misfortunes, follies, and crimes of Europe.”913
If the Anschluss was a test of Hitler’s strength, it was also a test of Mussolini’s willingness to acquiesce to complicity in crime. He had posed as Austria’s protector; on the night of the March 1938 invasion Hitler waited near hysteria at the Chancellery in Berlin for a response from Rome to a letter he had sent justifying his action. The call came at 10:25 P.M. and the Führer snatched up the phone. “I have just come back from the Palazzo Venezia,” his representative reported. “The Duce accepted the whole thing in a very friendly manner. He sends you his regards. . . . Mussolini said that Austria would be immaterial to him.” Hitler replied: “Then please tell Mussolini I will never forget him for this! Never, never, never, no matter what happens! . . . As soon as the Austrian affair has been settled I shall be ready to go with him through thick and thin—through anything!” The Führer visited Rome in triumph in May, parading into districts the Duce had ordered hastily face-lifted to conceal their decay.914 Fermi’s circle repeated the verse passed around the city by word of mouth by which an indignant Roman poet greeted the Nazi dictator:
Rome of travertine splendor
Patched with cardboard and plaster
Welcomes the little housepainter
As her next lord and master.915
Italy would only be saved, Fermi told Segrè bitterly, if Mussolini went crazy and crawled on all fours.916
The summer of 1938, July 14, brought the anti-Semitic Manifesto della Razza of which Segrè read in the Chicago newspaper on his way from New York to Berkeley. Italians are Aryans, the manifesto claimed. But “Jews do not belong to the Italian race.”917 In Germany the vicious distinction had been commonplace; in Italy it was shocking. Italian Jews, only one in a thousand, were largely assimilated. The Fermis’ two children—Giulio, a son, had been born in 1936—might be exempted since they were Catholic, born of a nominally Catholic father. But Laura was a Jew. She was spending the summer with the children in the Dolomites, the South Tyrol district named for the magnesian limestone that rings broad basin meadows with the flat, sharp formations Italians call “shovels.” Enrico came up preoccupied in August to the meadow of San Martino di Castrozza to break the news. When Mussolini pushed through the first anti-Semitic laws early in September the Fermis decided to emigrate as soon as they could arrange their affairs. Fermi wrote four American universities and to avoid suspicion mailed each lette
r from a different Tyrolese town. Five schools shot back invitations. In confidence he accepted a professorship at Columbia and went off to Copenhagen to Bohr’s annual gathering of the brethren.
The previous month the International Congress of Anthropological and Ethnological Sciences had invited Bohr to address it at a special session in Helsingør, Shakespeare’s Elsinore, on the coast of Zealand north of Copenhagen. In the Renaissance castle there Denmark’s most prominent citizen used the occasion to challenge Nazi racism publicly before the world. It was a brave statement by a brave man. Bohr understood that the major Western democracies were not likely to rally to the defense of his small, unprotected nation when Hitler eventually turned to look its way. George Placzek, a Bohemian theoretician working in Copenhagen whose tongue was almost as sharp as Pauli’s, had already encapsulated that cruel truth. “Why should Hitler occupy Denmark?” Placzek quipped to Frisch one day. “He can just telephone, can’t he?”918
Against the brutal romanticism of German Blood and Earth, Bohr set the subtle corrective of complementarity. He spoke of “the dangers, well known to humanists, of judging from our own standpoint cultures developed within other societies.”919 Complementarity, he proposed, offered a way to cope with the confusion. Subject and object interact to obscure each other in cultural comparisons as in physics and psychology; “we may truly say that different human cultures are complementary to each other. Indeed, each such culture represents a harmonious balance of traditional conventions by means of which latent possibilities of human life can unfold themselves in a way which reveals to us new aspects of its unlimited richness and variety.”920
The German delegates walked out.921 Bohr went on to say that the common aim of all science was “the gradual removal of prejudices,” a complementary restorative to the usual pious characterization of science as a quest for incontrovertible truth.922 To a greater extent than any other scientist of the twentieth century Bohr perceived the institution of science to which he dedicated his life to be a profoundly political force in the world. The purpose of science, he believed, was to set men free. Totalitarianism, in Hannah Arendt’s powerful image, drove toward “destroying all space between men and pressing men against each other.”923 It was entirely in character that Bohr, at a time of increasing danger, publicly opposed that drive with the individualistic and enriching discretions of complementarity.
It was also entirely in character, when Fermi came to Copenhagen, that Bohr should lead him aside, take hold of his waistcoat button and whisper the message that his name had been mentioned for the Nobel Prize, a secret traditionally never foretold. Did Fermi wish his name withdrawn temporarily, given the political situation in Italy and the monetary restrictions, or would he like the selection process to go forward? Which was the same as telling Fermi he could have the Prize that year, 1938, if he wanted it and was welcome to use it to escape a homeland that threatened now despite the distinction he brought it to tear his wife from citizenship.924
* * *
Leo Szilard’s Cambridge collaborator Maurice Goldhaber emigrated to the United States in the late summer of 1938 and took up residence as an assistant professor of physics at the University of Illinois.925 Szilard appeared at Goldhaber’s new apartment in Champaign in September to finish work they had begun together in England and stayed to follow the Munich crisis, for which purpose his host went out and bought a radio. Szilard understood, as Winston Churchill also understood and told his consituents at the end of August, that “the whole state of Europe and of the world is moving steadily towards a climax which cannot long be delayed.”926 Before deciding between residency in England or the United States, Szilard said later, “I just thought I would wait and see.”927
The Sudetes, the border region of mountainous uplift that continues across Czechoslovakia from the Carpathians to the Erzgebirge, sustained at that time a German-speaking urban and industrialized population of some 2.3 million, about one-third of the population of western Czechoslovakia, formerly Bohemia. Nazi agitation began early in the Sudetenland; by 1935 a surrogate Nazi organization had become the largest political party in the Czechoslovakian republic. Hitler wanted Czechoslovakia next after Austria to facilitate his dream of German expansion, Lebensraum, and to deny airfields and support to the Soviet Union in the war he was well along in planning. The Sudetenland was his key. Czechoslovakia had built fortifications against German invasion across the Sudetes; after 1933 it imposed restrictions on the Sudeten Germans in an effort to protect that flank from subversion. Hitler opened his Czechoslovakian campaign even before the Anschluss, asserting the Reich’s duty to protect the Sudeten Germans. Through the summer of 1938 German pressure on Czechoslovakia increased while the Western democracies maneuvered to avoid confrontation.
By the time Szilard began listening to Maurice Goldhaber’s new radio the Czech government had established full martial law in the Sudetenland but also offered autonomy to the region in excess of what the Sudeten German Party had demanded. These developments prompted the British Prime Minister, Neville Chamberlain, to propose a meeting with Hitler. Hitler was delighted. He invited the Prime Minister to Berchtesgaden. The last outcome he wanted was a Czechoslovakian settlement. He signaled the Sudeten Nazis to increase their demands. Chamberlain heard the extremist proclamation on the radio on September 16 as he rode out by train from Munich: a call for immediate annexation to the German Reich. Back in London on September 17 he recommended the annexation. Hitler, he said, “was in a fighting mood.”928
“The British and French cabinets at this time,” writes Churchill, “presented a front of two overripe melons crushed together; whereas what was needed was a gleam of steel. On one thing they were all agreed: there should be no consultation with the Czechs. These should be confronted with the decision of their guardians. The Babes in the Wood had no worse treatment.”929 The two governments, citing “conditions essential to security,” decided that Czechoslovakia should cede to Germany all areas of the country where the population was more than 50 percent German.930 France had treaty obligations to Czechoslovakia but chose not to honor them. Facing such isolation, the small republic capitulated on September 21.
The Anglo-French proposals invoked self-determination for the German-speaking areas they defined. Hitler had agreed to such self-determination when he saw Chamberlain on September 16. Now the Prime Minister met with the Chancellor again, this time at Bad Godesberg on the Rhine outside Bonn, near Remagen. Hitler escalated his demands. “He told me,” Chamberlain reported immediately afterward to the House of Commons, “that he never for one moment supposed that I should be able to come back and say that the principle [of self-determination] was accepted.”931 Hitler wanted Czech acquiescence without self-determination by September 28 or he would invade. Chamberlain did not believe, however, he informed the Commons, that Hitler was deliberately deceiving him. The Nazi leader also told the Prime Minister “that this was the last of his territorial ambitions in Europe and that he had no wish to include in the Reich people of other races than Germans.”932
The Czechs mobilized a million and a half men. The French partly mobilized their army. The British fleet went active. At the same time a secret struggle may have been taking place between Hitler and the German general staff, which resisted any further plunge toward war. The result should have been stalemate, but Chamberlain moved again to concession. “Appeasement” was at that time a popular and not a pejorative word.
“How horrible, fantastic, incredible it is,” the Prime Minister admonished the British people by radio on September 27, the night before Hitler’s deadline, “that we should be digging trenches and trying on gas-masks here because of a quarrel in a faraway country between people of whom we know nothing!” He volunteered “to pay even a third visit to Germany.” He was, he said, “a man of peace to the depths of my soul.”933 He made the offer of a visit to Hitler at the same time directly by letter, and the Führer took him up on it the following afternoon. Chamberlain, French Premier Edoua
rd Daladier, Mussolini and Hitler met at Munich on the evening of September 29. By 2 A.M. the following morning the four leaders had agreed to Czech evacuation of the Sudetenland without self-determination within ten days beginning October 1. At Chamberlain’s suggestion he and Hitler then met privately and agreed further to “regard the Agreement signed last night . . . as symbolic of the desire of our two peoples never to go to war with one another again.”934 Before he left Munich, closeted with Mussolini, the Führer discussed Italian participation in the eventual invasion of the British Isles.935
Chamberlain flew home. He read the joint declaration to the crowd gathered at the airport in welcome. Back in London he waved the declaration from an upper window of the Prime Minister’s residence. “This is the second time there has come back from Germany to Downing Street peace with honour,” he told the multitude below. “I believe it is peace in our time.”936
A group of refugee scientists was gathered outside the Clarendon Laboratory at Oxford the next morning discussing the Munich agreement when Frederick Lindemann drove up.937 Churchill had described the Czechoslovakian partition as amounting to “the complete surrender of the Western Democracies to the Nazi threat of force.”938 Lindemann, Churchill’s intimate adviser, was equally disgusted. One of the refugees asked him if he thought Chamberlain had something up his sleeve. “No,” the Prof snapped, “something down his pants.”
A cable came along to Lindemann then:
HAVE ON ACCOUNT OF INTERNATIONAL SITUATION WITH GREAT REGRET POSTPONED MY SAILING FOR AN INDEFINITE PERIOD STOP WOULD BE VERY GRATEFUL IF YOU COULD CONSIDER ABSENCE AS LEAVE WITHOUT PAY STOP WRITING STOP PLEASE COMMUNICATE MY SINCERELY FELT GOOD WISHES TO ALL IN THESE DAYS OF GRAVE DECISIONS939
SZILARD
Szilard and Goldhaber found time during the crisis to write up a series of experiments with indium that they had started in England in 1937 and that Goldhaber and an Australian student, R. D. Hill, had completed before leaving for the United States. Szilard had thought indium might be a candidate for chain reaction but the results indicated that the radioactivity in indium of which Szilard had been suspicious was caused by a new type of reaction process, inelastic neutron scattering without neutron capture or loss. Szilard was discouraged. “As my knowledge of nuclear physics increased,” he said later, “my faith in the possibility of a chain reaction gradually decreased.”940 If other kinds of radiation also induced radioactivity in indium without producing neutrons, then he would have no more candidates for neutron multiplication and he would have to give up his belief in the process he still nicknamed “moonshine.” That final experiment would be worked by friends at the University of Rochester in upstate New York, where he would travel in early December.941
Making of the Atomic Bomb Page 34
