dorsal/arxiv
View SchemaShell Model for Warm Rotating Nuclei
| Authors | M. Matsuo, T. Døssing, E. Vigezzi, R. A. Broglia, K. Yoshida |
|---|---|
| Categories | |
| ArXiv ID | nucl-th/9701044 |
| URL | https://arxiv.org/abs/nucl-th/9701044 |
| DOI | 10.1016/S0375-9474(96)00489-7 |
| Journal | Nucl.Phys. A617 (1997) 1-33 |
Abstract
In order to provide a microscopic description of levels and E2 transitions in rapidly rotating nuclei with internal excitation energy up to a few MeV, use is made of a shell model which combines the cranked Nilsson mean-field and the residual surface delta two-body force. The damping of collective rotational motion is investigated in the case of a typical rare-earth nucleus, namely \Yb. It is found that rotational damping sets in at around 0.8 MeV above the yrast line, and the levels which form rotational band structures are thus limited. We predict at a given rotational frequency existence of about 30 rotational bands of various lengths, in overall agreement with the experimental findings. The onset of the rotational damping proceeds quite gradually as a function of the internal excitation energy. The transition region extends up to around 2 MeV above yrast and it is characterized by the presence of scars of discrete rotational bands which extend over few spin values and stand out among the damped transitions, and by a two-component profile in the $E_\gamma -E_\gamma$ correlation. The important role played by the high-multipole components of the two-body residual interaction is emphasized.
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"abstract": "In order to provide a microscopic description of levels and E2 transitions in\nrapidly rotating nuclei with internal excitation energy up to a few MeV, use is\nmade of a shell model which combines the cranked Nilsson mean-field and the\nresidual surface delta two-body force. The damping of collective rotational\nmotion is investigated in the case of a typical rare-earth nucleus, namely \\Yb.\nIt is found that rotational damping sets in at around 0.8 MeV above the yrast\nline, and the levels which form rotational band structures are thus limited. We\npredict at a given rotational frequency existence of about 30 rotational bands\nof various lengths, in overall agreement with the experimental findings. The\nonset of the rotational damping proceeds quite gradually as a function of the\ninternal excitation energy. The transition region extends up to around 2 MeV\nabove yrast and it is characterized by the presence of scars of discrete\nrotational bands which extend over few spin values and stand out among the\ndamped transitions, and by a two-component profile in the $E_\\gamma -E_\\gamma$\ncorrelation. The important role played by the high-multipole components of the\ntwo-body residual interaction is emphasized.",
"arxiv_id": "nucl-th/9701044",
"authors": [
"M. Matsuo",
"T. D\u00f8ssing",
"E. Vigezzi",
"R. A. Broglia",
"K. Yoshida"
],
"categories": [
"nucl-th"
],
"doi": "10.1016/S0375-9474(96)00489-7",
"journal_ref": "Nucl.Phys. A617 (1997) 1-33",
"title": "Shell Model for Warm Rotating Nuclei",
"url": "https://arxiv.org/abs/nucl-th/9701044"
},
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