Uranium-235 fission fragment pairs

  • Context: Undergrad 
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Discussion Overview

The discussion revolves around the fission of Uranium-235, specifically focusing on identifying the other fission fragment when one of the fragments is Cesium-137. The scope includes theoretical aspects of nuclear fission and the properties of resulting isotopes.

Discussion Character

  • Exploratory, Technical explanation, Debate/contested

Main Points Raised

  • One participant inquires about the identity of the other fission fragment when Cesium-137 is one of the products.
  • Another participant suggests that if the total number of nucleons is 99, Technetium-99 might be the other fragment, but questions the certainty of this identification.
  • There is a mention that fission typically results in free neutrons in addition to the larger fragments, which is relevant for understanding the chain reaction process.

Areas of Agreement / Disagreement

Participants express uncertainty regarding the specific identity of the other fission fragment and whether Technetium-99 is correct. There is no consensus on the matter, and the discussion remains unresolved.

Contextual Notes

Participants acknowledge that fission reactions generally produce free neutrons along with fission fragments, which may affect the total count of nucleons in the resulting isotopes.

Ultimadark
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Hello

I'm working on a report now, and I'm trying to find an answer to the following question (looked for 45 mins on the internet but no clue as to where to find it)

If Uranium-235 undergoes fission and one of the fragments is Cesium-137, which isotope is the other fission fragment?
 
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Assuming there are no other products - how many protons and neutrons are in what is left?
 
99, so I was thinking that maybe it was Technetium-99, but is there a way to be sure? I thought that all fissions had to result in some free neutrons as well as the larger fragments.
 
Ultimadark said:
99, so I was thinking that maybe it was Technetium-99, but is there a way to be sure? I thought that all fissions had to result in some free neutrons as well as the larger fragments.
In general there will be a few neutrons among the fission fragments - that is why there is a chain reaction.
 

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