Δ degrees of freedom in trinuclei. V. Exotic contributions

Details Δ degrees of freedom in trinuclei. V. Exotic contributions Δ degrees of freedom in trinuclei. V. Exotic contributions

Oct 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992phrvc..46.1178p&link_type=abstract

Physical Review C (Nuclear Physics), Volume 46, Issue 4, October 1992, pp.1178-1182

Physics

Nuclear Physics

17

Few-Body Systems, Binding Energies And Masses, A<=5

Scientific paper

Three-body channels constructed from two-body NΔ and ΔΔ states with non-nucleonic JTπ values (J,T, and π denote conserved angular momentum, isospin, and parity, respectively) appear in the three-body Faddeev equation. The effects of such ``exotic'' channels on the triton binding energy (ET) are studied here for the first time, using the Argonne V28 Δ model. Two types of exotic JTπ sectors are distinguished: ``Pauli exotic'' sectors from which NN channels are absent due to the Pauli principle and spin considerations, and ``isospin exotic'' sectors which have the non-nucleonic value (T=2) of the two-body isospin. Pauli exotic contributions to ET are found to yield about 90 keV of repulsion, while isospin exotics add another 55 keV to this figure, for a total effect of about 145 keV. Exotic effects thus only slightly modify our previous V28-model result for ET based on nonexotic NNN, NNΔ, NΔΔ, and ΔΔΔ configurations, moving it from about 7.29 MeV down to about 7.14 MeV. This worsens the triton binding energy defect to about 1.5 MeV. Exotic effects are further decomposed and overall implications are discussed as well.

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