کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1852716 | 1528809 | 2015 | 6 صفحه PDF | دانلود رایگان |
We report on precise hyperspherical-basis calculations of ηNN and ηNNNηNNN quasibound states, using energy dependent ηN interaction potentials derived from coupled-channel models of the S11S11N⁎(1535)N⁎(1535) nucleon resonance. The ηN attraction generated in these models is too weak to generate a two-body bound state. No ηNN bound-state solution was found in our calculations in models where ReaηN≲1 fm, with aηNaηN the ηN scattering length, covering thereby the majority of N⁎(1535)N⁎(1535) resonance models. A near-threshold ηNNNηNNN bound-state solution, with η separation energy of less than 1 MeV and width of about 15 MeV, was obtained in the 2005 Green–Wycech model where Re aηN≈1 fm. The role of handling self consistently the subthreshold ηN interaction is carefully studied.
Journal: Physics Letters B - Volume 747, 30 July 2015, Pages 345–350