J. Robert Oppenheimer

J. Robert Oppenheimer is presented as a physicist whose role in nuclear policy brought personal moral anguish into direct contact with presidential responsibility. After the Soviet Union detonated an atomic bomb, he chaired a scientific advisory committee that confirmed the news; soon afterward, he opposed developing a vastly more destructive hydrogen weapon on both moral and technical grounds.

Presidential Encounter

In a private meeting with Harry S. Truman, Oppenheimer arrived visibly agitated and said that his work on the bomb had left him feeling responsible for its deaths. Truman rejected the expression of guilt, insisting that the responsibility was his to bear, and afterward hoped he would not have to meet Oppenheimer again. The exchange exposed a sharp difference in how the two men confronted the bomb’s consequences: Oppenheimer voiced personal remorse, while Truman claimed the burden of decision as president.

The Soviet Test

When the Soviet Union’s atomic test became known, Oppenheimer chaired a hastily assembled advisory commission of nuclear scientists. At a meeting the morning after David E. Lilienthal and McCormack had flown to Washington, Oppenheimer looked frantic and stated that there was no question the Russians had detonated an atomic bomb. The news, initially discussed under the code name “Vermont,” changed the terms of the debate over what the United States should do next.

Opposition to the Hydrogen Bomb

In the secret discussions that began in October 1949, Oppenheimer opposed the proposed hydrogen bomb, or “Super,” alongside James B. Conant and Enrico Fermi, who ultimately also opposed proceeding. The scientific advisory committee’s objections were both technical and moral; Oppenheimer specifically doubted that such a bomb was technically feasible. His position placed him among three principal opponents, together with David E. Lilienthal and George Kennan, even as Edward Teller and Ernest Lawrence lobbied for development and other officials argued that the Soviet test made it necessary. The dispute therefore set Oppenheimer’s caution against calls to answer the new Soviet capability with a weapon of still greater destructive power.