• Hassan Khalili

      Articles written in Pramana – Journal of Physics

    • The asymptotic D-state to S-state ratio of triton

      Hossen Sadeghi Reza Pourimani Hassan Khalili

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      At low energies, an effective field theory (EFT) with only contact interactions as well as three-body forces allow a detailed analysis of renormalization in a non-perturbative context and uncovers novel asymptotic behaviour. Triton as a three-body system, based on the EFT have been previously shown to provide representative binding energies, charge radii, S-wave scattering amplitude and asymptotic normalization constants for the 3H bound state system. Herein, EFT predictions of the asymptotic D-state to S-state ratio of triton are calculated to more fully evaluate the adequacy of the EFT model. Manifestly model-independent calculations can be carried out to high orders, leading to high precision.

    • Three-body calculation of Be double-𝛬 hypernuclei

      Hossein Sadeghi Hassan Khalili Shahla Nahidinejad

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      Energy levels and $\Lambda\Lambda$ bond energy of the double-𝛬 hypernucleus are calculated by considering two- and three-cluster interactions. Interactions between constituent particles are contact interactions for reproducing the low binding energy of nuclei. The effective action is constructed to involve three-body forces. In this paper, we also compare the obtained binding energy result with experimental and other cluster and shell models. The results of all schemes agree very well showing the high accuracy of our method to calculate the other many-body hyperonic nuclei using three-cluster interactions. The experimental values of $B_{\Lambda\Lambda}$(${}^{10}_{\Lambda\Lambda}$ Be) = (11.90 ± 0.13) MeV, $B_{\Lambda\Lambda}$(${}^{11}_{\Lambda\Lambda}$Be) = (20.49 ± 1.15) MeV and $B_{\Lambda\Lambda}$(${}^{12}_{\Lambda\Lambda}$Be) = (22.23 ± 1.15) MeV seem to be more compatible with our calculated value of $B_{\Lambda\Lambda}$(${}^{10}_{\Lambda\Lambda}$Be) = 14.04 MeV, $B_{\Lambda\Lambda}$(${}^{11}_{\Lambda\Lambda}$Be) = 19.31 MeV and $B_{\Lambda\Lambda}$(${}^{12}_{\Lambda\Lambda}$Be) = 21.45 MeV in comparison with the other calculated results by Hiyama et al, Gal et al and Guleria et al.

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