dorsal/arxiv
View SchemaThreshold Effects in Multi-channel Coupling and Spectroscopic Factors in Exotic Nuclei
| Authors | N. Michel, W. Nazarewicz, M. Ploszajczak |
|---|---|
| Categories | |
| ArXiv ID | nucl-th/0702021 |
| URL | https://arxiv.org/abs/nucl-th/0702021 |
| DOI | 10.1103/PhysRevC.75.031301 |
| Journal | Phys.Rev.C75:031301,2007 |
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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"abstract": "In the threshold region, the cross section and the associated overlap\nintegral obey the Wigner threshold law that results in the Wigner-cusp\nphenomenon. Due to flux conservation, a cusp anomaly in one channel manifests\nitself in other open channels, even if their respective thresholds appear at a\ndifferent energy. The shape of a threshold cusp depends on the orbital angular\nmomentum of a scattered particle; hence, studies of Wigner anomalies in weakly\nbound nuclei with several low-lying thresholds can provide valuable\nspectroscopic information. In this work, we investigate the threshold behavior\nof spectroscopic factors in neutron-rich drip-line nuclei using the Gamow Shell\nModel, which takes into account many-body correlations and the continuum\neffects. The presence of threshold anomalies is demonstrated and the\nimplications for spectroscopic factors are discussed.",
"arxiv_id": "nucl-th/0702021",
"authors": [
"N. Michel",
"W. Nazarewicz",
"M. Ploszajczak"
],
"categories": [
"nucl-th"
],
"doi": "10.1103/PhysRevC.75.031301",
"journal_ref": "Phys.Rev.C75:031301,2007",
"title": "Threshold Effects in Multi-channel Coupling and Spectroscopic Factors in Exotic Nuclei",
"url": "https://arxiv.org/abs/nucl-th/0702021"
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