Strong binding and shrinkage of single and double <span style="text-decoration: overline;">K</span> nuclear systems (K−pp, K−ppn, K−K−p and K−K−pp) predicted by Faddeev-Yakubovsky calculations
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概要
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Non-relativistic Faddeev and Faddeev-Yakubovsky calculations were made for K−pp, K−ppn, K−K−p and K−K−pp kaonic nuclear clusters, where the quasi bound states were treated as bound states by employing real separable potential models for the K−-K− and the K−-nucleon interactions as well as for the nucleon-nucleon interaction. The binding energies and spatial shrinkages of these states, obtained for various values of the <span style="text-decoration: overline;">K</span> interaction, were found to increase rapidly with the <span style="text-decoration: overline;">K</span> interaction strength. Their behaviors are shown in a reference diagram, where possible changes by varying the <span style="text-decoration: overline;">K</span> interaction in the dense nuclear medium are given. Using the Λ(1405) ansatz with a PDG mass of 1405 MeV/c2 for K−p, the following ground-state binding energies together with the wave functions were obtained: 51.5 MeV (K−pp), 69 MeV (K−ppn), 30.4 MeV (K−K−p) and 93 MeV (K−K−pp), which are in good agreement with previous results of variational calculation based on the Akaishi-Yamazaki coupled-channel potential. The K−K−pp state has a significantly increased density where the two nucleons are located very close to each other, in spite of the inner NN repulsion. Relativistic corrections on the calculated non-relativistic results indicate substantial lowering of the bound-state masses, especially of K−K−pp, toward the kaon condensation regime. The fact that the recently observed binding energy of K−pp is much larger (by a factor of 2) than the originally predicted one may infer an enhancement of the <span style="text-decoration: overline;">K</span> interaction in dense nuclei by about 25% possibly due to chiral symmetry restoration. In this respect some qualitative accounts are given based on "clearing QCD vacuum" model of Brown, Kubodera and Rho.<BR><BR>(Contributed by Toshimitsu YAMAZAKI, M.J.A.)
- 日本学士院の論文
著者
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Maeda Shuji
Department Of Ophthalmology Hirosaki University School Of Medicine
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Yamazaki Toshimitsu
Riken Nishina Center
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Akaishi Yoshinori
RIKEN Nishina Center
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MAEDA Shuji
Department of Agro-Environmental Science, Obihiro University of Agriculture and Veterinary Medicine
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