After beam on target, with know byproducts, what is there e

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Andrew Haynes
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After beam on target, with know byproducts, what is there e

Post by Andrew Haynes » Sun Jan 10, 2016 2:31 am

Hi
Im using the site EXFOR to find data on particles colliding with targets, the list the threshold to make the by products, but I dont think the list the byproducts energy's state. Im after a neutron collision with Sn112, , it list El,N and the range 8.64MeV.

Thanks
Andrew
Andrew Haynes

prestonbarrows
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Re: After beam on target, with know byproducts, what is the

Post by prestonbarrows » Sun Jan 10, 2016 4:50 pm

To find the data for neutron collisions with Sn112, search "target:Sn112, reaction:n,* ". This will give you all results with a neutron colliding with Sn112 regardless of the byproducts.

The energy of the byproducts can be calculated by hand on paper. It all comes down to conservation of energy and momentum. Before the collision, you know what particles exist and how fast they are moving (the initial total energy and momentum). After the collision, you know which particles exist but not how fast they are moving. We can then use conservation of energy and momentum to set the initial and final energies and momenta equal and calculate the unknown final values.

This is very similar to the basic mechanics problem of billiard balls elastically colliding. The tricky part for nuclear reactions is they are in-elastic collisions. You need to account for the energy from change in mass (E=m*c^2) and any excited nuclear states. Incidentally, this is where the threshold energy you mentioned comes from; for reactions where the products are more massive than the initial particles, you need to input enough energy to convert into the necessary extra mass or else the reaction is impossible.

It is a bit out of the depth of a forum post to go over all the details in full. The standard text expaining this material is Introductory Nuclear Physics by Krane

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