Lecture Notes (19 pages)

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Lecture Notes



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Lecture Notes

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Lecture Notes


Pages:
19
School:
University of Texas at Arlington
Course:
Phys 3446 - Nuclear and Particle Physics
Nuclear and Particle Physics Documents

Unformatted text preview:

PHYS 3446 Lecture 6 Monday Sept 25 2006 Dr Jae Yu 1 Nuclear properties Mott scattering Spin and Magnetic Moments Stability and Instability of Nuclei Nature of the Nuclear Force Monday Sept 25 2006 Short Range Nature of the Nuclear Force Shape of the Nuclear Potential Yukawa Potential Range of Yukawa Potential PHYS 3446 Fall 2006 Jae Yu 1 Announcements LPCC Workshop 10am 5pm Saturday Sept 30 CPB303 and HEP experimental areas Need to go on shopping Need to know who is coming First term exam Date and time 1 00 2 30pm Wednesday Oct 4 Location SH105 Covers Ch 1 Ch 3 Appendix A Monday Sept 25 2006 PHYS 3446 Fall 2006 Jae Yu 2 Nuclear Properties Sizes At relativistic energies the magnetic moment of electron also contributes to the scattering Neville Mott formulated Rutherford scattering in QM and included the spin effects R Hofstadter et al discovered the effect of spin nature of nuclear proton form factor in late 1950s Mott scattering x sec scattering of a point particle is related to Rutherford x sec ds 4cos 2 q ds d W Mott 2 d W Rutherford Deviation from the distribution expected for pointscattering provides a measure of size structure Monday Sept 25 2006 PHYS 3446 Fall 2006 Jae Yu 3 Nuclear Properties Sizes Another way is to use the strong nuclear force of sufficiently energetic strongly interacting particles mesons protons etc What is the advantage of using these particles If the energy is high Coulomb interaction can be neglected These particles readily interact with nuclei getting absorbed into the nucleus Thus probe strong interactions directly These interactions can be treated the same way as the light absorptions resulting in diffraction similar to that of light passing through gratings or slits Monday Sept 25 2006 PHYS 3446 Fall 2006 Jae Yu 4 Nuclear Properties Sizes The size of a nucleus can be inferred from the diffraction pattern All these phenomenological investigation provided the simple formula for the radius of the nucleus to its number of nucleons or



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