Damping of Spin Resonances

  • P. F. Bortignon
  • R. A. Broglia
  • F. Zardi


In this conference we are learning how the Gamow-Teller giant resonance (GTR), after being a rather elusive vibrational mode1,2, is becoming one of the best characterized resonant structures of the nuclear spectrum. It has quantum numbers λ=0, τ=1 and σ=1, and it displays a forward peaked angular distribution in (p,n) reactions induced by protons with Ep ~ 200 MeV. The ratio of peak to background of these modes is strongly energy dependent and is determined by the energy dependence of the spin-isospin term \( V\left( r \right)\left( {\vec \sigma \vec \sigma } \right)\left( {\vec \tau \vec \tau } \right) \) of the nucleon-nucleon interaction3. A basic difference between the GTR and other giant resonances is that only about 50% of the strength of the operator responsible for the excitation of the GT mode (i.e. στ-) is found in the main peak and low energy region of the spectrum4.


Strength Function Giant Resonance Residual Interaction High Excitation Energy Surface Vibration 


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Copyright information

© Plenum Press, New York 1984

Authors and Affiliations

  • P. F. Bortignon
    • 1
    • 2
  • R. A. Broglia
    • 3
  • F. Zardi
    • 4
  1. 1.Istituto di FisicaUniversità di PadovaPadovaItaly
  2. 2.INFNL. N. LegnaroItaly
  3. 3.The Niels Bohr InstituteUniversity of CopenhagenCopenhagen ØDenmark
  4. 4.INFNPadovaItaly

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