Lettere al Nuovo Cimento (1971-1985)

, Volume 43, Issue 3, pp 135–139 | Cite as

Sum rule approach to the isospin symmetry breaking in4He

  • P. Quarati
  • M. Guidetti
  • P. P. Delsanto


By means of the (γ, p) and (γ, n) cross-sections, calculated on the basis of a recently proposed phenomenological model, which correctly reproduces the ratioR(Ex) = σ (γ, p)/σ(γ, n), we compute the energy-weighted sum rule σ-1. We find that for a proper choice of the residual interaction parameters the experimental value of σ-1 can be reproduced. Inserting the calculated value of σ-1 into a model-independent energy-weighted sum rule, we obtain the expected value of the average proton distribution radius. The agreement among the experimental, model-dependent and model-independent sum rules supports the validity of the model considered.


25.20 Photonuclear reactions and photon scattering 


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Copyright information

© Società Italiana di Fisica 1985

Authors and Affiliations

  • P. Quarati
    • 1
    • 2
  • M. Guidetti
    • 3
    • 4
  • P. P. Delsanto
    • 5
  1. 1.Dipartimento di Scienze Fisiche dell’ UniversitàCagliariItalia
  2. 2.Gruppo di CagliariIstituto Nazionale di Fisica NucleareItalia
  3. 3.Dipartimento di Fisica del PolitecnicoTorinoItalia
  4. 4.Sezione di TorinoIstituto Nazionale di Fisica NucleareItalia
  5. 5.Department of PhysicsUniversity of Puerto-RicoPuerto-Rico

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