Threshold effects in multichannel coupling and spectroscopic factors in exotic nuclei
Threshold effects in multichannel coupling and spectroscopic factors in exotic nuclei
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DOI：
10.1103/physrevc.75.031301
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发表时间：
2007-02
影响因子：
3.1
通讯作者：
N. Michel;N. Michel;W. Nazarewicz;W. Nazarewicz;W. Nazarewicz;M. Płoszajczak
中科院分区：
文献类型：
--
作者：
N. Michel;N. Michel;W. Nazarewicz;W. Nazarewicz;W. Nazarewicz;M. Płoszajczak
在阈值区，截面和相关的重叠积分服从Wigner阈值定律，导致Wigner-cusp现象。由于通量守恒，一个通道中的尖点异常在其他开放通道中表现出来，即使它们各自的阈值出现在不同的能量。阈值尖点的形状取决于散射粒子的轨道角动量，因此，研究弱束缚核中具有几个低阈值的维格纳异常可以提供有价值的光谱信息。在这项工作中，我们研究了在丰中子滴线核的光谱因子的阈值行为使用的伽莫夫壳模型，其中考虑到多体关联和连续效应。阈值异常的存在下证明和光谱因素的影响进行了讨论。
In the threshold region, the cross section and the associated overlap integral obey the Wigner threshold law that results in the Wigner-cusp phenomenon. Due to flux conservation, a cusp anomaly in one channel manifests itself in other open channels, even if their respective thresholds appear at a different energy. The shape of a threshold cusp depends on the orbital angular momentum of a scattered particle; hence, studies of Wigner anomalies in weakly bound nuclei with several low-lying thresholds can provide valuable spectroscopic information. In this work, we investigate the threshold behavior of spectroscopic factors in neutron-rich drip-line nuclei using the Gamow shell model, which takes into account many-body correlations and the continuum effects. The presence of threshold anomalies is demonstrated and the implications for spectroscopic factors are discussed.