dorsal/arxiv
View SchemaSpin-orbit splitting of 9 Lambda Be excited states studied with the SU_6 quark-model baryon-baryon interactions
| Authors | Y. Fujiwara, M. Kohno, K. Miyagawa, Y. Suzuki |
|---|---|
| Categories | |
| ArXiv ID | nucl-th/0407039 |
| URL | https://arxiv.org/abs/nucl-th/0407039 |
| DOI | 10.1103/PhysRevC.70.047002 |
| Journal | Phys.Rev. C70 (2004) 047002 |
Abstract
The previous Faddeev calculation of the two-alpha plus Lambda system for 9 Lambda Be is extended to incorporate the spin-orbit components of the SU_6 quark-model baryon-baryon interactions. We employ the Born kernel of the quark-model Lambda N LS interaction, and generate the spin-orbit component of the Lambda alpha potential by the alpha-cluster folding. The Faddeev calculation in the jj-coupling scheme implies that the direct use of the quark-model Born kernel for the Lambda N LS component is not good enough to reproduce the small experimental value Delta E^exp_{ls}=43 +- 5 keV for the 5/2^+ - 3/2^+ splitting. This procedure predicts three to five times larger values in the model FSS and fss2. The spin-orbit contribution from the effective meson-exchange potentials in fss2 is argued to be unfavorable to the small ls splitting, through the analysis of the Scheerbaum factors for the single-particle spin-orbit potentials calculated in the G-matrix formalism.
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"abstract": "The previous Faddeev calculation of the two-alpha plus Lambda system for 9\nLambda Be is extended to incorporate the spin-orbit components of the SU_6\nquark-model baryon-baryon interactions. We employ the Born kernel of the\nquark-model Lambda N LS interaction, and generate the spin-orbit component of\nthe Lambda alpha potential by the alpha-cluster folding. The Faddeev\ncalculation in the jj-coupling scheme implies that the direct use of the\nquark-model Born kernel for the Lambda N LS component is not good enough to\nreproduce the small experimental value Delta E^exp_{ls}=43 +- 5 keV for the\n5/2^+ - 3/2^+ splitting. This procedure predicts three to five times larger\nvalues in the model FSS and fss2. The spin-orbit contribution from the\neffective meson-exchange potentials in fss2 is argued to be unfavorable to the\nsmall ls splitting, through the analysis of the Scheerbaum factors for the\nsingle-particle spin-orbit potentials calculated in the G-matrix formalism.",
"arxiv_id": "nucl-th/0407039",
"authors": [
"Y. Fujiwara",
"M. Kohno",
"K. Miyagawa",
"Y. Suzuki"
],
"categories": [
"nucl-th"
],
"doi": "10.1103/PhysRevC.70.047002",
"journal_ref": "Phys.Rev. C70 (2004) 047002",
"title": "Spin-orbit splitting of 9 Lambda Be excited states studied with the SU_6 quark-model baryon-baryon interactions",
"url": "https://arxiv.org/abs/nucl-th/0407039"
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