arXiv subjects

Htun Htun Oo

Publications and source records attributed to Htun Htun Oo.

3 recordsLinked to original sources

arXiv2025

Determining the Ξ-Nucleus Potential from the Measured Binding Energies of ^15_Ξ^C

The recent observation of the deeply bound Ξ- hypernucleus ^15_Ξ^-C through the IRRAWADDY and KINKA events provided a crucial benchmark for determining the Ξ-nucleus interaction. This work aims to constrain the depth of this potential by calculating the binding energy B_Ξof the ^15_ΞC system, which forms a Ξ^- -^14 N bound state. We achieve this by numerically solving the Schroedinger equation for a Ξhyperon within a phenomenological Woods-Saxon potential, using the stable Numerov method, incorporating the Coulomb interaction. For a potential well depth V_0 = 12 MeV, our calculations yield a 0^+_1 state binding energy of 6.35 MeV and a 1^-_1 state energy of 0.87 MeV. These results are in excellent agreement with the IRRAWADDY event (B_Ξ= 6.27 \pm 0.27 MeV) and the shallower 1^-_1 states (KISO/IBUKI events, B_Ξ\approx 1 MeV), respectively. Assuming Ξ^0 instead of Ξ^-, we predict the ground state 0^+ of _{Ξ^0}^{15}N with (B_{Ξ^0} = 2.636 MeV) by omitting the Coulomb interaction as a first approximation.

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arXiv2020

Microscopic Calculation of $Λ-α$ Folding Potential

We construct a folding potential between the $α$ and $Λ$ particles based on underlying nucleon-nucleon and hyperon-nucleon interactions. Starting from a phenomenological $Λ$-N potential and a Gaussian form of the $α$-particle wave function we obtain for the built $α$-$Λ$ interaction a bound $^5_Λ$He state with the binding energy (3.10 MeV), which is consistent with recent experimental data $3.12 \pm 0.02$ MeV. When in turn an exact solution of the four-body Faddeev-Yakubovsky equation for the $α$-particle calculated with the CDBonn, Nijmegen or Argonne V18 realistic nucleon-nucleon potential is used and the phenomenological Gaussian $Λ$-N potential is replaced by the realistic (Nijmegen NSC97f) potential approximated by a rank-1 separable form, then $^5_Λ$He is overbound. In particular, its binding energy given by the folding potential generated with the $α$ particle wave function based on the CDBonn potential is 7.47 MeV. Although the rank-1 separable $Λ$-N potential reproduces the exact scattering length and the effective range of the original $Λ$-N potential, the overbinding results from the lack of the required repulsive properties in the assumed separable form.

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arXiv2012

The Complex Energy Method Applied to the Nd Scattering with a Model Three-Body Force

Using the complex energy method, the problem of nucleon-deuteron scattering is solved with a simple three-body force having a separable form. Our results are compared with the results of modern direct two-variable calculations and a good agreement is found. This forms a firm base for other applications of the complex energy method.

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