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The Manhattan Project

Across
He was the wartime head of the Los Alamos Laboratory.
The committee advising the president toward all public statements regarding and uses of nuclear power.
He headed the army’s portion of the development and planning of the bombs.
This was the codename for the atomic bomb dropped on the Japanese city of Hiroshima on 6 August 1945.
The simpler design of creating a large explosion through shooting a pellet of uranium or plutonium into a larger mass of the same substance.
Down
The more complicated design of detonation through the use of internal mechanics meant to essentially heat the inner core of the bomb through smaller internal explosions.
This was the code name of the first detonation of a nuclear weapon conducted by the United States Army on July 16, 1945, as part of the Manhattan Project.
A project commissioned by president Franklin Delano Roosevelt to help end the second world war through use of nuclear weapons.
A secret laboratory established by the Manhattan Project and operated by the University of California.
The codename for the atomic bomb that was detonated over the Japanese city of Nagasaki by the United States on 9 August 1945.