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The Discovery of Thorium-236

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Book Id: WPLBN0000151161
Format Type: PDF eBook
File Size: 0.2 MB
Reproduction Date: 2008
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Title: The Discovery of Thorium-236  
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Language: English
Subject: Government publications, Legislation., Government Printing Office (U.S.)
Collections: Government Library Collection
Historic
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Publisher: Government Printing Office

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The Discovery of Thorium-236. (n.d.). The Discovery of Thorium-236. Retrieved from http://www.worldebooklibrary.net/


Excerpt
Excerpt: Another research interest of the nuclear chemists at LAMPF concerns the “exotic” nuclei produced when 800-MeV protons strike nuclei, especially heavy ones. This interaction yields a wide assortment of particles and nuclear fragments ranging from pions and neutrons to nuclei only a little lighter than the target. Among these fragments are nuclei, many of them still unidentified, that represent the extremes of what can exist at all. Some of them have a great excess of neutrons, so great that their last few neutrons are bare!y held; these are described as almost neutron-unbound or near the “neutron drip line.” There exist other nuclei at the opposite extreme: severely deficient in neutrons and rich in protons, that is, almost proton-unbound, or near the “proton drip line.” These exotic nuclei are hard to find, Not only are they produced very rarely in nuclear reactions, but they have half-lives so short (seconds or less) that they cannot be isolated and identified by conventional radiochemical techniques. A team of nuclear chemists devised a method to identify some of these exotic products in flight, that is, as they emerge from the proton/heavy nucleus reaction.

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