Summary
We present a first calculation of the potential and spin-orbit coupling for hypernuclei in the framework of a nuclear-potential model based on a spontaneous collective (superradiant) pion-nucleon-delta interaction. A perturbative evaluation of the propagation of a hyperon in such a coherent medium leads to an effective hypernuclear potential of the same shape and roughly half the depth (i.e∼30 MeV) of the standard nuclear potential and a negligible spin-orbit coupling for both Λ and Σ hypernuclei. Such results are in complete agreement with existing experimental data. Moreover, in this framework, we are able to explain the surprisingly narrow decay widths of the Σ hypernuclei.
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References
M. Danysz andJ. Pniewski:Philos. Mag.,44, 348 (1953);G. C. Bonazzola et al.: Nuovo Cimento A,45, 300 (1978);R. Bertini et al.: Phys. Lett. B,90, 375 (1980);Nucl. Phys. A,368, 365 (1981); for a brief review of the experimental situation regarding hypernuclei see,e.g.,R. Bertini:Europhys. News,22, 115 (1991); see alsoProceedings of the 1988 International, Symposium on Hypernuclear and Low-Energy Kaon Physics, edited byT. Bressani, F. Cannata, J. Lowe andR. A. Ricci:Nuovo Cimento A,102, 1 (1989);T. Bressani:Common Problems and Ideas of Modern Physics, edited byT. Bressani, B. Minetti andA. Zenoni (World Scientific, 1992), p. 211; for Σ hypernuclei see,e.g.,C. B. Dover, D. J. Millener andA. Gal:Phys. Rep.,184, 1 (1989).
W. Brückner et al.:Phys. Lett B,79, 157 (1978).
H. J. Pirner:Phys. Lett. B,85, 190 (1979).
G. Preparata:Nuovo Cimento A,103, 1213 (1990);Common Problems and Ideas of Modern Physics, edited byT. Bressani, B. Minetti andA. Zenoni (World Scientific, 1992), p. 3.
G. Preparata andP. G. Ratcliffe:Phys. Lett. B,276, 219 (1992);G. Preparata andP. G. Ratcliffe:A novel approach to nuclear shadowing, Milano preprint MITH 91/13.
G. Preparata andP. G. Ratcliffe:Quasi-elastic electron nucleus scattering and the Coulomb sum Rule, Milano preprint MITH 91/16, submitted toPhys. Rev. Lett.
P. G. Ratcliffe:Common Problems and Ideas of Modern Physics, edited byT. Bressani, B. MInetti andA. Zenoni (World Scientific, 1992), p. 71.
H. J. Pirner K. Yazaki, P. Bonche andM. Rho:Nucl. Phys. A,329, 491 (1979).
G. Preparata andP. G. Ratcliffe: work in progress.
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Preparata, G., Ratcliffe, P.G. Nuclear models and the hypernuclear interaction. Nuov Cim A 106, 685–690 (1993). https://doi.org/10.1007/BF02787237
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DOI: https://doi.org/10.1007/BF02787237