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Threshold Effects in Multi-channel Coupling and Spectroscopic Factors in Exotic Nuclei

Abstract : 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.
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http://hal.in2p3.fr/in2p3-00130181
Contributor : Michel Lion <>
Submitted on : Friday, February 9, 2007 - 4:15:23 PM
Last modification on : Thursday, February 1, 2018 - 1:25:48 AM

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N. Michel, W. Nazarewicz, M. Ploszajczak. Threshold Effects in Multi-channel Coupling and Spectroscopic Factors in Exotic Nuclei. Physical Review C, American Physical Society, 2007, 75, pp.031301(R). ⟨10.1103/PhysRevC.75.031301⟩. ⟨in2p3-00130181⟩

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