Presentation about radioactive decay and Microscopic and Macroscopic cross section

1. Nuclear Physics
First three Lectures
Muhammad Zeeshan Khalid

2. Radioactive Decay
• Radioactive decay, also known as nuclear decay or
radioactivity, is the process by which a nucleus of an unstable
atom loses energy by emitting particles of ionizing radiation. A
material that spontaneously emits this kind of radiation—
which includes the emission of energetic alpha particles, beta
particles, and gamma rays—is considered radioactive.

3. Radioactive Decay
Radioactive decay results in the emission of either:
• an alpha particle (a),
• a beta particle (b),
• or a gamma ray(g).

4. 1. Neutron cross section
• In nuclear and particle physics, the concept of a neutron cross
section is used to express the of interaction between an
incident neutron and a target nucleus.
• Microscopic cross scattering does provide no information
about the change in neutron direction or energy that occur in
such collision.

5. Microscopic Cross Section

6. Macroscopic Cross Section

7. Neutron-Nuclear Interaction
 Potential Scattering: Neutron scatter elastically off the
nucleus
 Compound Nucleus: Neutron absorbed by the nucleus to
form compound nucleus and then decay an energetic particle.