## Proceedings of the International School of Physics "Enrico Fermi.", Volume 37N. Zanichelli, 1967 - Nuclear physics |

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Page 142

However there can be complex zeros of pilk ) in the upper half plane , which do

not correspond to bound states , because they do not give normalizable O ' s . As

we shall see presently , they correspond to resonances .

However there can be complex zeros of pilk ) in the upper half plane , which do

not correspond to bound states , because they do not give normalizable O ' s . As

we shall see presently , they correspond to resonances .

**Poles**of the s - matrix .Page 177

by En , say , and allowing X , → oo , we get 1 T ( x ) = - - - Teg Co tgh Bc / 2 , , dx

X – 2 - €5 We know from the BCS theory that this expression develops a

conjugate pair of complex

across the ...

by En , say , and allowing X , → oo , we get 1 T ( x ) = - - - Teg Co tgh Bc / 2 , , dx

X – 2 - €5 We know from the BCS theory that this expression develops a

conjugate pair of complex

**poles**( creeping out of the zero in the discontinuityacross the ...

Page 182

Analytic continuation across Tc . Equation ( 97 ) shows that for T > T . , F ( 2 ) has

a whole series of

across the real axis onto the physical sheet , close to z = 0 . We note the ...

Analytic continuation across Tc . Equation ( 97 ) shows that for T > T . , F ( 2 ) has

a whole series of

**poles**in the unphysical sheet . At T = T . , a pair of these emergeacross the real axis onto the physical sheet , close to z = 0 . We note the ...

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### Contents

LOMER Band theory and magnetism | 1 |

JACCARINO Studies of the hyperfine interaction in transi | 39 |

P W ANDERSON and W L MCMILLAN Multiplescattering | 50 |

Copyright | |

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### Common terms and phrases

alloys amplitude analytic Anderson approximation assume average band becomes Born bound calculation complex computed condition conduction consider contribution correct correlation corresponding coupling curve defined density depends determined discussed effect electrons energy equation exchange expected expression fact factor Fermi Fermi level ferromagnetic field function given gives Hamiltonian host metal impurity atom included integral interaction interesting lattice limit localized magnetic matrix element means metals method moments momentum normal obtained occur operator orbital particle perturbation Phys physical plane polarization poles positive possible potential present problem properties range relation replaced represent resonance scattering screening Sect seems shift shown similar simple solution spin structure surface temperature theory tion transition metals usual wave wave functions write written zero