Effective two-body ΛN → NN weak potentials deduced from three-body ΛNN → NNN interactions and hypernuclear non-mesonic weak decay rates
Effective two-body ΛN → NN weak potentials deduced from three-body ΛNN → NNN interactions and hypernuclear non-mesonic weak decay rates
复制标题
由三体ΛNN→NNN相互作用推导出有效的二体ΛN→NN弱势和超核非介子弱衰变率
DOI：
10.1093/ptep/ptac134
复制
发表时间：
2022
影响因子：
3.5
通讯作者：
Thomas A. Rijken
中科院分区：
文献类型：
--
作者：
Kazunori Itonaga;Toshio Motoba;Thomas A. Rijken
本文研究了三体弱相互作用ΛNN→ NNN在双核子诱导超核非介子弱衰变中的作用。在介子对交换（MPE）模型的基础上构造了三体弱相互作用，并在Loiseau-Nogami-Ross近似下由三体弱相互作用导出了有效的两体ΛN→ NN弱势. MPE的强耦合常数取自Nijmegen ESC和GESC模型，MPE的弱耦合常数由Dalitz和Von Hippel [Phys.Lett.10，153（1964）]在弱Λ-n混合模型中计算。用有效两体ΛN→ NN弱势计算超核非介子衰变率，对双核子诱导衰变率Γ2N有一定的贡献.对、、和进行了计算，并将计算结果与实验数据进行了比较.我们通过引入由三体弱相互作用导出的有效两体势，证明了两核子引起的轻超核和p壳层超核的非介子衰变的可能性，尽管计算结果仍有不确定性.给出了我们的“有效二体ΛN→ NN模型”的讨论和局限性。
We intend to study the role of the three-body weak ΛNN→NNNinteraction in two-nucleon induced hypernuclear non-mesonic weak decay. The three-body weak interactions are constructed on the basis of the meson-pair exchange (MPE) model and then we derive the effective two-body ΛN→NNweak potentials from the three-body interactions based on the Loiseau–Nogami–Ross approximation. The strong coupling constants of MPE are taken from the Nijmegen ESC and GESC models and the weak ones of MPE are evaluated in the weak Λ–nmixing model by Dalitz and Von Hippel [Phys. Lett.10, 153 (1964)]. The effective two-body ΛN→NNweak potentials are applied to evaluate hypernuclear non-mesonic decay rates, which should give a certain additional contribution to the two-nucleon induced decay rate Γ2N. Calculations ofare done for,, andand the results are compared with experimental data. We have demonstrated the possibility of accounting for the two-nucleon induced non-mesonic decays of light andp-shell hypernuclei by introducing the effective two-body potentials deduced from the three-body weak interactions, though the calculatedstill includes uncertainties. Discussions and limitations of our “effective two-body ΛN→NNmodel” are given.