科研費　「少数系の厳密計算に基づくストレンジネス核物理の展開」令和７年〜令和９年

Λｄ散乱 (弾性散乱)

Calculated Λ-deuteron s-wave phase shifts as a function of Ecm. The left (right) vertical scale is for the real (imaginary) part. The upper (lower) panel shows the phase shifts in the J = 1/2 (J = 3/2) channel. The solid (dashed) curves are for the chiral NLO19 (NLO13) Y N interaction of the Juelich-Bonn group with the chiral N4LO+ NN interaction. The solid and dashed curves are almost indistinguishable in the case of J = 1/2. The cutoff scale is 550 MeV for both NN and Y N interactions.

Faddeev calculations of low-energy Λ-deuteron scatteringand momentum correlation function

Λｄ散乱 (三体ブレークアップ)

The effects of the deuteron breakup are estimated for the Λ-deuteron momentum correlation function. Faddeev amplitudes in calculating low-energy Λ-deuteron scattering can provide not only the elastic scattering part but also breakup wave functions in the incident and the rearrangement channels. Calculations are carried out using nucleon-nucleon (NN) and hyperon-nucleon (YN) interactions parametrized in chiral effective field theory. The effects of the breakup in the incident channel are found to be marginally insignificant. Those of the rearrangement channel are not negligible, but not large when the source radius is larger than 2.5 fm. Nevertheless, it is worthwhile to have the information on the magnitude of these effects in analyzing the experimental data.

Λ-deuteron momentum correlation functions incorporating deuteron breakup contributions in Faddeev formulation

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