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Sum rule approach to the isospin symmetry breaking in4He

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Lettere al Nuovo Cimento (1971-1985)

Summary

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(E x) = 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.

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Author notes

  1. P. P. Delsanto

    Present address: Code 5834, Naval Research Lab., 20375, Washington, D.C., USA

Authors and Affiliations

  1. Dipartimento di Scienze Fisiche dell’ Università, Cagliari, Italia

    P. Quarati

  2. Gruppo di Cagliari, Istituto Nazionale di Fisica Nucleare, Italia

    P. Quarati

  3. Dipartimento di Fisica del Politecnico, Torino, Italia

    M. Guidetti

  4. Sezione di Torino, Istituto Nazionale di Fisica Nucleare, Italia

    M. Guidetti

  5. Department of Physics, University of Puerto-Rico, Mayaguez, 00708, Puerto-Rico

    P. P. Delsanto

Authors
  1. P. Quarati
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  2. M. Guidetti
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  3. P. P. Delsanto
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Quarati, P., Guidetti, M. & Delsanto, P.P. Sum rule approach to the isospin symmetry breaking in4He. Lett. Nuovo Cimento 43, 135–139 (1985). https://doi.org/10.1007/BF02749593

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  • DOI: https://doi.org/10.1007/BF02749593

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