Difference between revisions of "Nucleus Recoil-Energy in Neutron Capture Reactions"

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The conservation of momentum demands that<br>  
 
The conservation of momentum demands that<br>  
  
<math>\overrightarrow(P_n)</math>
+
<math>\overrightarrow{P}_n + \overrightarrow{P}_T = \overrightarrow{P}_{T+n} = \overrightarrow{P}_R</math>  
 +
 
 +
where P denotes the momentum, index n denots the neutron, index T the target nucleus, and index R the recoil.&nbsp;
 +
 
 +
The kinetic energy, E<sub>K</sub>, is given by:
  
 
==== Recoil energy from γ emission<br> ====
 
==== Recoil energy from γ emission<br> ====
  
 
d
 
d

Revision as of 13:06, 14 November 2012

A nucleus which captures a thermal neutron must, since the momentum is conserved, receive a recoil energy. Immediately after capturing a neutron, the nucleus will emit γ quantas to get rid of the excess energy liberated when the neutron is bound to the nucleus. This also result in a certain amount of recoil energy on the nucleus. 

Recoil energy from n-capture

The conservation of momentum demands that

[math]\overrightarrow{P}_n + \overrightarrow{P}_T = \overrightarrow{P}_{T+n} = \overrightarrow{P}_R[/math]

where P denotes the momentum, index n denots the neutron, index T the target nucleus, and index R the recoil. 

The kinetic energy, EK, is given by:

Recoil energy from γ emission

d