Chadwick

Chadwick A V and J Corish 1997. Defects and Matter Transport in Solid Materials. In NATO ASI Series C 498 (New Trends in Materials Chemistry), pp. 285-318. 

D. J. Chadwick, in R. A. Jones, ed., Hetero c/ic Compounds Vol. 48, Part I, John WHey and Sons, Inc., New York, 1990, pp. 1—103 The Beiktein Handbook of Organic Chemist Vols. 21—22, BeHstein Institute, Erankfurt/Main, Germany, 1978. 

The stmcture of the particles inside the nucleus was the next question to be addressed. One step in this direction was the discovery of the neutron in 1932 by Chadwick, and the deterrnination that the nucleus was made up of positively charged protons and uncharged neutrons. The number of protons in the nucleus is known as the atomic number, Z. The number of neutrons is denoted by A/, and the atomic mass is thus A = Z - - N. Another step toward describing the particles inside the nucleus was the introduction of two forces, namely the strong force that holds the protons and neutrons together in spite of the repulsion between the positive charges of the protons, and the weak force that produces the transmutation by P decay. 

R. Bhar, in T. Brewis, J. Chadwick, A. Kennedy, R. Morgan, G. Pearse, J. Schooling, J. Spooner, and M. West, eds.. Metals and Minerals Annual Teviem, Miningjoumal Ltd., London, 1994. 

Fig. A 1.34. Dendrites of silver in a copper-silver eutectic matrix, x330. (After G. A. Chadwick, Metallography of Phase Transformations, Butterworth, 1972.)...

In the early years of this century the periodic table ended with element 92 but, with J. Chadwick s discovery of the neutron in 1932 and the realization that neutron-capture by a heavy atom is frequently followed by j6 emission yielding the next higher element, the synthesis of new elements became an exciting possibility. E. Fermi and others were quick to attempt the synthesis of element 93 by neutron bombardment of but it gradually became evident that the main result of the process was not the production of element 93 but nuclear fission, which produces lighter elements. However, in 1940, E. M. McMillan and P. H. Abelson in Berkeley, California, were able to identify, along with the fission products, a short-lived isotope of... 

HC1 D. J. Chadwick, in Chem. Heterocycl. Comp., Vol. 48, part 1,... 

Fermi had been fascinated by the discovery of the neutron by James Chadwick in 1932. He gradually switched his research interests to the use of neutrons to produce new types of nuclear reactions, in the hope of discovering new chemical elements or new isotopes of known elements. He had seen at once that the uncharged neutron would not be repelled by the positively-charged atomic nucleus. For that reason the uncharged neutron could penetrate much closer to a nucleus without the need for high-energy particle accelerators. lie discovered that slow neutrons could... 

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