James Chadwick and the Neutron By Jake Samson & Shai Zimmerman

Who is James Chadwick? Born: October 20, 1891 Bollington, England Death: July 24, 1974 (Age 82) Cambridge, England Spouse: Aileen Stewart- Brown Daughter: Joanna Stewart Chadwick Batterham Daughter: Judith Chadwick

Who is James Chadwick? Most significant work done: Colleagues: Rivals: Cavendish Laboratory, Cambridge Colleagues: Ernest Rutherford E.S Bieler Rivals: None - Rutherford

Achievements Graduated from Honours School of Physics Manhattan Project Development of atomic bombs 1932: Made fundemental discovery! Existence of the NEUTRON!!!! (particle in an atom without electrical charge) Added nitrogen to alpha particles with emission of a proton First artificial nuclear transformation

Manhattan Project Atomic disentegration does NOT need to overcome an electric barrier. Can penetrate and split heaviest elements Fission of Uranium- 235 created atom bomb

Discovery of the Neutron Chadwick’s set-up an experiment discovering neutrons -alpha particles are projected towards a beryllium target -the emitted particles fell on an object called paraffin wax -once it fell on the paraffin wax, it released another type of particles -that other type of particles were protons -what went through the beryllium target were uncharged and had a similar mass to protons…called NEUTRONS

Chadwick Diagram

Awards Knighted in 1945

Other famous Knights

Sir Sean Connery (James Bond)

Sir Elton John

Sir Paul McCartney

Awards Continued Hughes Medal of Royal Society 1935 Nobel Prize in physics

The Most Important Thing About the Discovery of the Neutron?

Without it, there would be no…

Jimmy Neutron!