The Landau-Migdal Parameters, g'_NN and g'_N\Delta and Pion Condensations
The Landau-Migdal Parameters, g'_NN and g'_N\Delta and Pion Condensations
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Landau-Migdal 参数，g_NN 和 g_NDelta 和 Pion 凝聚
DOI：
10.1016/s0370-2693(99)00445-1
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发表时间：
1999
期刊：
影响因子：
--
通讯作者：
T. Tatsumi
中科院分区：
文献类型：
--
作者：
T. Suzuki;H. Sakai;T. Tatsumi
根据最近对~（90）Nb巨Gamow-Teller态的实验数据，估算了核子-核子和核子-Δ耦合的Landau-Migdal参数g′ s.观察到GT强度淬灭10%，对于g′ΔΔ<1.0，提供0.12<g′NΔ<0.23。由于g′NΔ如此小，激发能由g′NN主导，估计约为0.59。g′ s的普适性系数不能同时再现激发能和强度。该结果是在忽略实验中的系统不确定性的情况下得到的，而这些系统不确定性目前是未知的。
The Landau-Migdal parameters, g′'s, for nucleon–nucleon and nucleon–Δ couplings are estimated from recent experimental data on the giant Gamow-Teller state of90Nb . The observed quenching of the GT strength by 10% provides 0.12<g′NΔ<0.23 for g′ΔΔ<1.0. Since g′NΔis thus small, the excitation energy is dominated by g′NN, which is estimated to be about 0.59. The universality ansatz for g′'s cannot reproduce the excitation energy and strength simultaneously. The results are obtained ignoring the systematic uncertainties in the experiment which are unknown at present.