Is This Reaction Allowed or Forbidden?

[Aleolomorfo]

Homework Statement

Establish whether the following reactions are allowed or not, if it is not, give the reasons

Relevant Equations

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Hello everybody!

I have a doubt about a reaction.

$$ p + n \rightarrow \Lambda + \Sigma^+ $$

I have to establish if it is allowed or not.

• Charge is conserved (1 -> 1)
• Baryon number is conserved (2 -> 2)
• Strangeness is not conserved (0 -> -2)
• Third component of the isospin is not conserved (0 -> 1)
• Isospin is conserved (1 or 0 -> 1)
• Angular momentum is conserved (1 or 0 -> 1 or 0)

Since strangeness and the third component of the isospin are not conserved, it is not a strong reaction, and neither an electromagnetic one since the third component of the isospin is not conserved.

My conclusion is that this is a weak allowed reaction. I would like to know if it is correct, because this is not exactly a "typical" weak reaction.

Thanks in advance!

 

[mfb]

It is technically allowed but the cross section must be tiny with the strangeness changing by two.