Conservation Laws etc ChNE 524

Conservation Laws etc ChNE 524 - ChNE 524: Interaction of...

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Unformatted text preview: ChNE 524: Interaction of Radiation with Matter Conservation Laws, Q-Values, Fission, and Fusion Faraj Ghanbari, Ph.D. Sandia National Labs Fall 2005 Faraj Ghanbari, Ph.D. 2 Outline 1. Conservation Laws Nuclear Collisions Non-relativistic Scattering: Elastic; Inelastic Nuclear Reactions Simple Collision Shorthand Notations Fall 2005 Faraj Ghanbari, Ph.D. 3 Outline ( continued) 2. Q-Value Kinematics of Nuclear Collisions (Reactions) Define Q-value: Change in Kinetic Energy Q-Value (>0, =0, <0) and Reaction Type Q-Value and Mass Defect Kinetic Energy in Center-of-Mass (COM) Threshold Energy Examples Fall 2005 Faraj Ghanbari, Ph.D. 4 Outline ( continued) 3. Compound Nucleus Models Liquid Drop Model Shell Model Unifying (Single Theory) Model 4. Fission Reactions 5. Fusion Reactions Fall 2005 Faraj Ghanbari, Ph.D. 5 Conservation Laws Conservation Laws in non-relativistic nuclear collisions: The conserved quantities are: 1. Total energy and linear momentum; 2. Angular momentum; 3. Parity; 4. Number of neutrons and protons separately We will use (1) and (4) from the above list. Fall 2005 Faraj Ghanbari, Ph.D. 6 Conservation Laws Lets start with some definitions: Collision: Well-collimated beam of incident particles striking a fixed target. Target is normally thick enough to give a sufficient rate of useful collision without degrading the energy and collimation of the incident beam or significantly impeding the emergence of collision products. Fall 2005 Faraj Ghanbari, Ph.D. 7 Conservation Laws Collision: A simple collision Fall 2005 Faraj Ghanbari, Ph.D. 8 Conservation Laws Types of Collision Scattering A collision of an incident particle with a target particle in which the former appears among the products of the collision. Elastic Scattering A collision in which the incident particle and target particle remain unchanged, no other particles are created and no energy is lost by any means from the collision. Fall 2005 Faraj Ghanbari, Ph.D. 9 Conservation Laws Types of Collision Inelastic Scattering A collision in which the target particle becomes excited or breaks up. This term can also be applied to a collision in which the incident particle alone, the target particle alone, or both undergo such changes (become excited or break up); Nuclear Reaction A collision between nuclei in which the nuclear constituents are rearranged. Note: There is not a clear distinction between some nuclear reactions and inelastic scattering Fall 2005 Faraj Ghanbari, Ph.D. 10 Conservation Laws A simple Collision Shorthand Notation: A (a, b) B Example: Shorthand: Fall 2005 Faraj Ghanbari, Ph.D....
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This note was uploaded on 04/11/2008 for the course CHNE 524 taught by Professor Mohagheghi during the Fall '08 term at New Mexico.

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Conservation Laws etc ChNE 524 - ChNE 524: Interaction of...

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