Public
- Public
- Network
- Groups
- Popular
- People

The beginning of the short article reads: Disintegration of Uranium by Neutrons: a New Type of Nuclear Reaction ON bombarding uranium with neutrons, Fermi and collaborators' found that at least four radioactive substances were produced, to two of which atomic numbers larger than 92 were ascribed. Further investigations? demonstrated the existence of at least nine radioactive periods, six of which were assigned to elements beyond uranium, and nuclear isomerism had to be assumed in order to account for their chemical behaviour together with their genetic relations.

Download link

The beginning of the short article reads: Disintegration of Uranium by Neutrons: a New Type of Nuclear Reaction ON bombarding uranium with neutrons, Fermi and collaborators' found that at least four radioactive substances were produced, to two of which atomic numbers larger than 92 were ascribed. Further investigations? demonstrated the existence of at least nine radioactive periods, six of which were assigned to elements beyond uranium, and nuclear isomerism had to be assumed in order to account for their chemical behaviour together with their genetic relations.
https://files.mastodon.social/media_attachments/files/111/370/269/022/840/173/original/7826ac10506d67ff.jpeg

Notices where this attachment appears

Robert McNees (mcnees@mastodon.social)'s status on Tuesday, 07-Nov-2023 16:44:11 UTC Robert McNees
in reply to

Hahn kept the results hidden from physicists at his institute in Berlin, so no one would know about his secret collaboration with Meitner. He published them in January 1939.
Meitner and Otto Frisch (her nephew!) published the physical explanation in February, after working out the basic model over the Christmas holiday. During a snowy hike they stopped at a tree stump for a back-of-the-envelope calculation that explained ~200 MeV of energy released in the reaction ²³⁵U + n → ¹⁴⁴Ba + ⁹⁰Kr + 2n.

In conversation about a year ago from mastodon.social permalink