Three- and four-body structure calculations of single A hypernuclei such as Λ7He, Λ9Be and Λ13C and double ΛΛ4H, ΛΛ 7He; ΛΛ7He, Lambda;Λ8Li,, ΛΛ 9Li, ΛΛ9Be, and ΛΛ10Be are discussed. The energy levels of ΛΛ7He whose core is a famous halo nucleus, Λ6;He, are predicted based on Λ5He+ 2N three-body model.In the microscopic 2α+Λ (3α+Λ) model Λ9Be(Λ13C), we predict the spin-orbit splittings of 5/21+-3/2 1+ in Λ9:Be and 3/21--1/21- in Λ13C to be 0.08-0.16 MeV and 0.39-0.78 MeV, respectively, with the use of OBE-model NSC97a ∼f. On the other hand quark-model AN spin-orbit force gives rise to half of the splittings of the smallest OBE-model prediction. The experimental data were reported to be 31.4-3.6+2.5keV for Λ 9:Be and to be 152± 54Plusmn; 36 keV for Λ13C. By performing four-body calculation of ΛΛH with both NNΛΛ and NNNΞ channels, we show that the ΛΛ - ΞN coupling potential plays an important role in making ΛΛ 4H bound. Energy levels of the double-Λ hypernuclei, ΛΛ7He, ΛΛ8Li, ΛΛ 9Li, ΛΛ9Li, ΛΛ9Be and ΛΛ10Be are predicted on the basis of an α + x Λ + Λ four-body model, where x = n, p, d, t, 3He and α, respectively.
All Science Journal Classification (ASJC) codes
- Nuclear and High Energy Physics