[DOC] [TLE] Discovery of the Neutron - HyperPhysics [PAR] It is remarkable that the neutron was not discovered until 1932 when James 
Chadwick used scattering data to calculate the mass of this neutral particle. ... Not 
only were these inconsistent with photon emission on energy grounds, the... [DOC] [TLE] A Science Odyssey: People and Discoveries: Chadwick discovers ... [PAR] Chadwick's own research focused on radioactivity. In 1919 Rutherford had discovered the proton, a positively charged particle within the atom's nucleus. ... Rutherford also put out the idea that there could be a particle with mass but no charge. He called it a neutron, and imagined it as a paired proton and electron. [DOC] [TLE] Discovery of the neutron - Wikipedia [PAR] James Chadwick discovered the neutron in 1932 while working at Cavendish 
Laboratory. The story of the discovery of the neutron and its properties is central 
to the extraordinary ... While these considerations did not "prove" an electron 
could not exist in the .... 1932. Fermi's theory requires the neutron to be a spin- 
particle. [DOC] [TLE] PhysicsLAB: Famous Experiments: The Discovery of the Neutron [PAR] In 1920, Ernest Rutherford postulated that there were neutral, massive particles in the nucleus of atoms. ... In 1932, Chadwick proposed that this particle was Rutherford's neutron. In 1935, he was awarded the Nobel Prize for his discovery. Using kinematics, Chadwick was able to determine the velocity of the protons. [DOC] [TLE] This Month in Physics History - American Physical Society [PAR] May 1932: Chadwick reports the discovery of the neutron. ... James Chadwick ... 
no real evidence for this, and the proposed neutral particle would be difficult to... [DOC] [TLE] Chadwick discovers the neutron 1932 - Chemistry [PAR] For four years, James Chadwick was a prisoner of war in Germany. When World 
War I ... In 1919 Rutherford had discovered the proton, a positively charged 
particle ... evidence for any of these ideas. Chadwick kept the ... Chadwick 
repeated their experiments but with the goal of looking for a neutral particle -- one 
with the... [DOC] [TLE] James Chadwick - Biography, Facts and Pictures - Famous Scientists [PAR] James Chadwick discovered the neutron in 1932 and was awarded the Nobel ... 
of attempts in the laboratory to find these neutral particles, but without success. [DOC] [TLE] Chapter 2, Section 2 [PAR] We'll see that the atom is composed in part of electrically charged particles, ... It 
was not initially clear whether the rays were a new form of radiation or ... These 
measurements made it possible to calculate a value of coulombs per .... Neutrons 
were discovered in 1932 by the British scientist James Chadwick (18911972). [DOC] [TLE] Sir James Chadwick's Discovery of Neutrons | ANS Nuclear Cafe [PAR] Oct 19, 2011 ... Sir James Chadwick, born 120 years ago on October 20, 1891, made one of the 
... called the neutron, having a similar mass as a proton but electrically neutral. 
... In 1932, Irne and Frdric Joliot-Curie performed experiments with this ... By 
comparing the energies of particles ejected from all these various... [DOC] [TLE] A world of particles.The discovery of the model. The neutron. [PAR] He suggested that the nucleus contained a particle with a positive charge  the 
proton. ... the neutron is that it has no effect on charged particles (because it is 
neutral). ... because both of these rely on ionisation to register the presence of 
particles. ... In 1932, James Chadwick, who had worked with Rutherford, detected
... [DOC] [TLE] Rutherford's Nuclear World: The Story of the Discovery of the ... [PAR] Rutherford died in 1937, having led a first wave of discovery of the atom. ... on the 
Miraculous Year (Annus mirabilis) of 1932 in the Cavendish Laboratory: ... but 
most importantly, he invited his former student, James Chadwick, to join him in 
further experiments. ... The target emitted a fast particle of 1 unit positive charge. [DOC] [TLE] Ernest Rutherford [PAR] The Discovery of Radioactivity (Ernest Rutherford) .... It was not until 1932, 
however, that James Chadwick was able to prove that these neutral particles 
exist. [DOC] [TLE]

Question: In 1932 James Chadwick discovered these non-charged particles
Answer: neutrons