Nuclear Reaction: Neutron & Plutonium-239

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Discussion Overview

The discussion revolves around a nuclear reaction involving a neutron striking a Plutonium-239 nucleus, resulting in the creation of Barium-142. Participants explore what other element is produced in this reaction, focusing on the conservation of nucleons and the implications of neutron involvement.

Discussion Character

  • Homework-related
  • Technical explanation
  • Mathematical reasoning

Main Points Raised

  • One participant expresses uncertainty about the reaction and seeks guidance on how to approach the problem.
  • Another participant suggests looking up the proton counts for plutonium and barium to deduce the missing element.
  • A participant proposes that Strontium may be the other element created, based on the difference in proton counts.
  • Another participant confirms the conservation of nucleons and emphasizes the need to balance the reaction similarly to chemical reactions.
  • A later reply questions whether Strontium-97 is the correct answer, considering the additional neutron involved in the reaction.
  • One participant clarifies that while Strontium-97 accounts for the nucleons, the initiation of the reaction by an additional neutron must also be considered, along with the production of free neutrons that can lead to further reactions.

Areas of Agreement / Disagreement

Participants do not reach a consensus on the exact element produced alongside Barium-142, with differing views on whether it is Strontium or Strontium-97, and the implications of neutron involvement remain a point of discussion.

Contextual Notes

Participants discuss the conservation of nucleons but do not fully resolve the implications of the additional neutron or the exact accounting of nucleons in the reaction.

kirsten_2009
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Homework Statement


A neutron strikes a Plutonium-239 (239Pu) nucleus and creates Barium-142 (142Ba). What other element is created?

Homework Equations

The Attempt at a Solution



I actually have no idea...could someone just start me off? Thanks!
 
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Look up plutonium and its proton count and similarly for barium then use your powers of deduction.

Show us your thought process to get your answer.
 
since there is a difference of 38 protons that are "missing" would it be Strontium that is also created?
 
Yes.

Number of nucleons is conserved. You have to have the same number of protons and the same number of neutrons on both sides of the reaction equation. This is not different from balancing chemical reaction (just then you conserve number of atoms and charge, which is actually applying the same conservation principles).
 
Got it! Thank you =)
 
Sorry, one last question. Would it be Strontium-97 since that is the difference between 239 and 142?
 
Yes and no. Yes - you are right about accounting, number of neutrons after the reaction must equal number of neutrons after the reaction. No - reaction was initiated by an additional neutron, so you should take it into account as well, plus, in such reactions free neutrons are produced (and they further break more nuclei, which is why we call it a chain reaction), and these have to be accounted for too.
 

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