部分散乱振幅の分離展開法と4核子計算(軽い中性子過剰核やハイパー核などにおける弱結合の物理とクラスター構造,研究会報告)

概要

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In order to obtain the low-lying energy spectra of ^4He-nucleus, we use the 4-body Faddeev-Yakubovsky equation. For this purpose, we test the convergence of the separable expansion of the [3+1] and [2+2] subamplitudes. Here, we demonstrate (i) HSE, (ii) EDPE, (iii) GSE results for Y.Y. potential and PEST 1 potentials. It was found that the separable expansion forms should be constructed not only with the positive eigenvalue and the form factors, but also with the negative eigenvalue's one. Furthermore, results of the GSE method with the rank-3 is as good as the rank-6 HSE and EDPE results. We obtained-45.31MeV for the ground state and -11.40MeV for the first excited state of ^4He by using rank-3 GSE amplitudes with the Y.Y. potential. These results are slightly smaller than the results of HSE amplitudes.
素粒子論グループ素粒子研究編集部の論文
1992-10-20