To use all functions of this page, please activate cookies in your browser.
my.chemeurope.com
With an accout for my.chemeurope.com you can always see everything at a glance – and you can configure your own website and individual newsletter.
 My watch list
 My saved searches
 My saved topics
 My newsletter
Calcium48
Calcium48 is a rare isotope of calcium containing 20 protons and 28 neutrons. It makes up 0.187% of natural calcium by mole fraction.^{[1]} Although it is unusually neutronrich for such a light nucleus, the only radioactive decay pathway open to it is the extremely rare process of double beta decay. Its halflife is about 4.3×10^{19} years,^{[2]} so for all practical purposes it can be treated as stable. One factor contributing to this unusual stability is that 20 and 28 are both magic numbers, making ^{48}Ca a "doubly magic" nucleus. Additional recommended knowledgeSince ^{48}Ca is both stable and neutronrich, it is a valuable starting material for the production of new nuclei in particle accelerators, both by fragmentation^{[3]} and by fusion reactions with other nuclei, for example in the recent production of ununoctium.^{[4]} Heavier nuclei generally require a greater fraction of neutrons for maximum stability, so neutronrich starting materials are necessary. ^{48}Ca is the lightest nucleus known to undergo double beta decay and the only one simple enough to be analyzed with the sd shell model. It also releases more energy (4.27 MeV) than any other double beta decay candidate.^{[2]} These properties make it an interesting probe of nuclear structure models and a promising candidate in the ongoing search for neutrinoless double beta decay. References


This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Calcium48". A list of authors is available in Wikipedia. 