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- n. A naturally-occurring radioactive isotope of calcium, 4820Ca, having twenty protons and twenty-eight neutrons, and a half-life of 4.3x1019 years
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Russian physicists bombarded plutonium-244 with calcium-48 to produce a single atom of rapidly decaying 114.
And what an experiment it was: For 150 days, the scientists smashed calcium-48 atoms into berkelium-249 atoms, and at the end of the experiment the team had created exactly six atoms of element 117, according to the
Add that to the usual 20 protons in calcium, and you have calcium-48.
Specifically, an isotope, or variation, of berkelium (berkelium-249) was bombarded with an isotope of calcium, calcium-48.
A team led by Yuri Oganessian of the Joint Institute for Nuclear Research in Dubna, Russia, reports smashing together calcium-48 - an isotope with 20 protons and 28 neutrons - and berkelium-249, which has 97 protons and 152 neutrons.