NASA NTRS · 19820026809
Superheavy elements - An early solar system upper limit for elements 107 to 110
Abstract
The abundance of samarium-152 in the Santa Clara iron meteorite is found to be 108 x 10 to the 7th atoms per gram. This quantity, if attributed to fission of a superheavy element with atomic number 107 to 109, limits the amount of superheavy elements in the early solar system to 0.000017 times the abundance of uranium-238. For element 110, the limit is 0.000034.
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Nozette, S., Boynton, W. V.. 1981-10-16. Superheavy elements - An early solar system upper limit for elements 107 to 110. https://ntrs.nasa.gov/citations/19820026809
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