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About 2 g of calcium-48. Calcium-48 is a doubly magic nucleus with 28 neutrons; unusually neutron-rich for a light primordial nucleus. It decays via double beta decay with an extremely long half-life of about 6.4×10 19 years, though single beta decay is also theoretically possible. [22]
The synthesis of ununennium was first attempted in 1985 by bombarding a sub-microgram target of einsteinium-254 with calcium-48 ions at the superHILAC accelerator at Berkeley, California: 254 99 Es + 48 20 Ca → 302 119 Uue * → no atoms. No atoms were identified, leading to a limiting cross section of 300 nb. [29]
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