To James Chadwick Ramsgate, Mid-June 1848

2018 ◽  
Author(s):  
A. W. N. Pugin
Keyword(s):  
James Chadwick

New Particles

2018 ◽  
Author(s):  
Roger H. Stuewer
Keyword(s):  
Gamma Rays ◽  
Atomic Hydrogen ◽  
Nuclear Physics ◽  
Hydrogen Isotope ◽  
Alpha Particles ◽  
Cloud Chamber ◽  
Ernest Rutherford ◽  
James Chadwick ◽  
Theoretical Foundations ◽  
New Particles

In December 1931, Harold Urey discovered deuterium (and its nucleus, the deuteron) by spectroscopically detecting the faint companion lines in the Balmer spectrum of atomic hydrogen that were produced by the heavy hydrogen isotope. In February 1932, James Chadwick, stimulated by the claim of the wife-and-husband team of Irène Curie and Frédéric Joliot that polonium alpha particles cause the emission of energetic gamma rays from beryllium, proved experimentally that not gamma rays but neutrons are emitted, thereby discovering the particle whose existence had been predicted a dozen years earlier by Chadwick’s mentor, Ernest Rutherford. In August 1932, Carl Anderson took a cloud-chamber photograph of a positron traversing a lead plate, unaware that Paul Dirac had predicted the existence of the anti-electron in 1931. These three new particles, the deuteron, neutron, and positron, were immediately incorporated into the experimental and theoretical foundations of nuclear physics.

James Chadwick

Physics Today ◽  
1974 ◽  
Vol 27 (10) ◽  
pp. 87-89 ◽  
Author(s):  
Mark Oliphant
Keyword(s):  
James Chadwick

James Chadwick

Physics Today ◽  
2015 ◽  
Keyword(s):  
James Chadwick

Letters of Sir T. Fairfax and col. James Chadwick

1888 ◽  
Vol s7-V (117) ◽  
pp. 225-225
Author(s):  
C. H. Firth
Keyword(s):  
James Chadwick

The Contemporary Scientific Archives Centre

1979 ◽  
Vol 34 (1) ◽  
pp. 123-131 ◽  
Keyword(s):  
Great Scientist ◽  
James Chadwick ◽  
North Wales ◽  
Scientists And Engineers

In the early 1960s several people began to worry about the records of contemporary scientists and engineers; ‘contemporary’ for this purpose is defined as those who died after 1945. It was clear that this generation of scientists and engineers had changed history in all kinds of ways and yet no systematic efforts were being made to preserve their papers. The papers even of minor politicians poets and novelists were by contrast eagerly sought. I remember that my own concern dated from a visit to James Chadwick who, besides being a great scientist, had played a crucial diplomatic and administrative role in the wartime and postwar atomic project. He had retired to North Wales and showed me his attic lined with filing cabinets but when I asked what he was going to do with them, he gloomily replied ‘burn them’. (They were subsequently preserved).

The neutron and the bomb: a biography of Sir James Chadwick

1998 ◽  
Vol 35 (08) ◽  
pp. 35-4552-35-4552
Keyword(s):  
James Chadwick

The Neutron and the Bomb: A Biography of Sir James Chadwick

Physics Today ◽  
1997 ◽  
Vol 50 (12) ◽  
pp. 65-66 ◽  
Author(s):  
Andrew Brown ◽  
Roger R. Stuewer
Keyword(s):  
James Chadwick

Address of the President Sir Robert Robinson, at the Anniversary Meeting, 30 November 1950

1951 ◽  
Vol 138 (890) ◽  
pp. 1-16 ◽  
Keyword(s):  
Continuous Spectrum ◽  
Nuclear Physics ◽  
James Chadwick ◽  
The World

The Copley Medal is awarded to Sir James Chadwick for his pioneering researches on the constitution of matter. Sir James Chadwick was in turn the pupil, the collaborator and the colleague of Rutherford, basking for a time in the warmth of the radiation from the master and then showing that he possessed fires of his own. It is recognized throughout the world that his leadership in nuclear physics has played a most important part in the sensational advances of sub-atomic science in the last few years. In early days he was the first to find the continuous spectrum of beta-rays and the first to make an accurate measurement of the charge on the nucleus.

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