Advertisement

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
Article

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(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.

PACS

25.20 Photonuclear reactions and photon scattering 

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

References

  1. (1).
    S. Weinberg:Physica (Utrecht) A,96, 327 (1974).ADSGoogle Scholar
  2. (2).
    E. M. Henley: in.Isospin in Nuclear Physics, edited byD.H. Wilkinson (North-Holland, Amsterdam, 1969), p. 43.Google Scholar
  3. (3).
    P. P. Delsanto, A. Pompei andP. Quarati:J. Phys. C,3, 1133 (1977).Google Scholar
  4. (4).
    D.H. Halderson andR. J. Philpott:Nucl. Phys. A,359, 365 (1981).CrossRefADSGoogle Scholar
  5. (5).
    R. C. McBroom, H. R. Weller, N. R. Roberson andD. R. Tiley:Phys. Rev. C,25, 1644 (1982).CrossRefADSGoogle Scholar
  6. (6).
    B. L. Berman, D.D. Faul, P. Meyer andD. L. Olsen:Phys. Rev. C,22, 2273 (1980).CrossRefADSMATHGoogle Scholar
  7. (7).
    R. J. Calarco, B. L. Berman andT. W. Donnelly:Phys. Rev. C,24, 1866 (1983).CrossRefADSGoogle Scholar
  8. (8).
    B. L. Berman, S. C. Fultz andM. A. Kelly:Phys. Rev. Lett.,25, 938 (1970).CrossRefADSGoogle Scholar
  9. (9).
    P.P. Delsanto,M. Danos andL. C. Biedenharn:Proceedings of the International Conference on Nuclear Structure, edited byA. van der Woude andB. J. Verhaar, Vol.1 (North-Holland, Amsterdam, 1982), p. 120.Google Scholar
  10. (10).
    D. H. Halderson andR. J. Philpott:Phys. Rev. C,28, 1000 (1983).CrossRefADSGoogle Scholar
  11. (11).
    S. Shlomo:Rep. Prog. Phys.,41, 66 (1978).CrossRefGoogle Scholar
  12. (12).
    P.P. Delsanto, L. C. Biedenharn andM. Danos:Lett. Nuovo Cimento,42, 59 (1985).CrossRefGoogle Scholar
  13. (13).
    P.P. Delsanto, L. C. Biedenharn, M. Danos andS. Tuan:Lett. Nuovo Cimento,37, 369 (1983).CrossRefGoogle Scholar
  14. (14).
    A. Dellafiore andE. Lipparini:Nucl. Phys. A,388, 639 (1982).CrossRefADSGoogle Scholar
  15. (15).
    R. F. Barrett andP.P. Delsanto:Phys. Rev. C,10, 101 (1974).CrossRefADSGoogle Scholar
  16. (16).
    P. P. Delsanto andP. Quarati:J. Phys. C,2, L161 (1976).ADSGoogle Scholar
  17. (17).
    A. Gorbunov:Phys. Lett. B,27, 436 (1968).CrossRefADSGoogle Scholar
  18. (18).
    Yu. M. Arkatov, P. I. Vatset, V. I. Voloshchuk, V. A. Zolenko, I. M. Prokhorets andV.I. Chmil’:Sov. J. Nucl. Phys.,19, 598 (1974).Google Scholar
  19. (19).
    F. Balestra, E. Bollini, L. Busso, K. Garfagnini, C. Guraldo, C. Piraguno, S. Scrimaglio andA. Zanini:Nuovo Cimento A,38, 145 (1977).CrossRefADSGoogle Scholar
  20. (20).
    L. Foldy:Phys. Rev.,107, 1303 (1957).MathSciNetCrossRefADSGoogle Scholar

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

Personalised recommendations