Shell Model with residual interactions – mostly 2-particle systems Simple forces, simple physical...

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Shell Model with residual interactions – mostly 2-particle systems Simple forces, simple physical interpretation

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Page 1: Shell Model with residual interactions – mostly 2-particle systems Simple forces, simple physical interpretation.

Shell Model with residual interactions – mostly 2-particle

systems

Simple forces, simple physical interpretation

Page 2: Shell Model with residual interactions – mostly 2-particle systems Simple forces, simple physical interpretation.
Page 3: Shell Model with residual interactions – mostly 2-particle systems Simple forces, simple physical interpretation.
Page 4: Shell Model with residual interactions – mostly 2-particle systems Simple forces, simple physical interpretation.
Page 5: Shell Model with residual interactions – mostly 2-particle systems Simple forces, simple physical interpretation.

2 – (valence) particle systems• Need to consider a more complete Hamiltonian:

H = H0 + Hresidual

Hresidual reflects interactions not included in the single particle potential. Especially important for valence nucleons.

NOT a minor perturbation. In fact, these residual interactions determine almost everything we know about most nuclei, especially e-e nuclides.

Start with 2- particle system, that is, a nuclei that are “doubly magic + 2”.

Hresidual is H12(r12)

Consider two identical valence nucleons with angular momenta j1 and j2 .

Two questions: What total angular momenta j1 + j2 = J can be formed, and what are the energies of the states with these angular momenta?

Page 6: Shell Model with residual interactions – mostly 2-particle systems Simple forces, simple physical interpretation.

Coupling of two angular momenta

j1+ j2 All values from: j1 – j2 to j1+ j2 (j1 = j2)

Example: j1 = 3, j2 = 5: J = 2, 3, 4, 5, 6, 7, 8

For j1 = j2: J = 0, 2, 4, 6, … ( 2j – 1) (Why these?)

j1+ j2 All values from: j1 – j2 to j1+ j2 (j1 = j2)

Example: j1 = 3, j2 = 5: J = 2, 3, 4, 5, 6, 7, 8

For j1 = j2: J = 0, 2, 4, 6, … ( 2j – 1) (Why these?)

//

Page 7: Shell Model with residual interactions – mostly 2-particle systems Simple forces, simple physical interpretation.

How can we know which total J values are obtained for the coupling of two indentical nucleons in the same orbit with total angular momentum j? Several methods: easiest is

the “m-scheme”.

How can we know which total J values are obtained for the coupling of two indentical nucleons in the same orbit with total angular momentum j? Several methods: easiest is

the “m-scheme”.

Page 8: Shell Model with residual interactions – mostly 2-particle systems Simple forces, simple physical interpretation.
Page 9: Shell Model with residual interactions – mostly 2-particle systems Simple forces, simple physical interpretation.

Separate radial and angular coordinates Separate radial and angular coordinates

Page 10: Shell Model with residual interactions – mostly 2-particle systems Simple forces, simple physical interpretation.
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Page 15: Shell Model with residual interactions – mostly 2-particle systems Simple forces, simple physical interpretation.
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Page 17: Shell Model with residual interactions – mostly 2-particle systems Simple forces, simple physical interpretation.
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Page 22: Shell Model with residual interactions – mostly 2-particle systems Simple forces, simple physical interpretation.
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Page 25: Shell Model with residual interactions – mostly 2-particle systems Simple forces, simple physical interpretation.
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