gmf_lecture5 - Nucleons & Nuclei Nucleons...

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Unformatted text preview: Nucleons & Nuclei Nucleons & Nuclei a quick guide to the real essentials in the subject which particle and nuclear physicists wont tell you The Paradox The Paradox Do electron scattering on nuclei and deep inelastic scattering and find that bare nucleons have a radius ~ 1 fm. Therefore, in a big nucleus like 208 Pb the nucleons should be overlapping and you would think that the structure and dynamics of the system would depend on quark and gluon degrees of freedom. It does not. In fact, nuclei behave as if the nucleons in them are non-interacting little spheres, bound in a collective potential well. This single particle nature of nuclei makes them easy to treat. particle physicists nucleus - overlapping nucleons-nearly a bag of quark gluon plasma! nuclear physicists nucleus - independent, nearly non-interacting nucleons moving in a collective potential well Nucleon - (www.jlab.org) 3 basic quarks plus a sea of gluons and quark-antiquark pairs ~ 1 fm Nucleon-Nucleon Potential Nucleon-Nucleon Potential Experimental data can be fit up to energies ~ 300 MeV with a set of short range potentials where the coordinates of the two nucleons and the relative coordinates are and where the potentials have Yukawa forms, e.g., - Independent Particle Behavior in Nuclear Matter and Finite Nuclei Sum strong, attractive nucleon-nucleon potential with a repulsive hard core at r C ~ 0.4 fm to all orders in one type of interaction (ladder graphs) . . . n n n n n n n n + + + n n n n . . . Bethe-Salpeter sum shows that strongly interacting systems of nucleons at nuclear matter density behave like a system of non-interacting ( i.e., independent ) quasi-particles, with quantum numbers (mass, charge, spin) close to those of bare nucleons, and moving in a collective potential well. (Infinite) Nuclear Matter...
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This note was uploaded on 02/12/2012 for the course PHYSICS 104 taught by Professor Staff during the Fall '10 term at Rutgers.

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gmf_lecture5 - Nucleons & Nuclei Nucleons...

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