Coulomb barrier

coulomb Barrier

1. Experimental Nuclear physics Course Instructor: Dr. Waseem Ahmad Presentation On : Coulomb Barrier presented by: Mehak Tariq Ghazi University DG Khan

2. Coulomb Barrier The barrier between two atomic nuclei, due to coulomb repulsion that has to be overcome for nuclear fusion to proceed This is given by coulomb potential Where Z & z` are atomic numbers of two nuclei

3. Coulomb Barrier R & R` are their effective radii The quantity ( R+R` ) therefore classically the distance of closest approach. Previous study as we know that R= 1.2 A⅓ fm

4. Coulomb Barrier This is relatively small amount of energy to supply by simply colliding two accelerated beams of light nuclei but in practice nearly all the particles would be elastically scattered The only particle way is to heat a confined mixture of the nuclei to supply enough thermal energy to overcome the coulomb barrier The temperature estimated from the relation E= kT Where Kb is Boltzmann’s constant given by k B = 8.6× eVK `  

5. Coulomb Barrier Fusion actually occurs at low temperature than this estimate due to a combination of two reasons First & most important is the phenomenon of quantum tunneling, which means that the full height of the coulomb barrier does not have to be overcome. Second reason that fusion occurs at low temperature then expected is that a collection of nuclei at a given mean temperature.

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