dorsal/arxiv
View Schema$\bar K$-Nuclear Deeply Bound States?
| Authors | Avraham Gal |
|---|---|
| Categories | |
| ArXiv ID | nucl-th/0604067 |
| URL | https://arxiv.org/abs/nucl-th/0604067 |
| DOI | 10.1142/S0218301307006368 |
| Journal | Int.J.Mod.Phys.E16:891-903,2007 |
Abstract
Following the prediction by Akaishi and Yamazaki of relatively narrow $\bar K$-nuclear states, deeply bound by over 100 MeV where the main decay channel $\bar K N \to \pi \Sigma$ is closed, several experimental signals in stopped $K^-$ reactions on light nuclei have been interpreted recently as due to such states. In this talk I review (i) the evidence from $K^-$-atom data for a {\it deep} $\bar K$-nucleus potential, as attractive as $V_{\bar K}(\rho_0) \sim -(150 - 200)$ MeV at nuclear matter density, that could support such states; and (ii) the theoretical arguments for a {\it shallow} potential, $V_{\bar K}(\rho_0) \sim -(40 - 60)$ MeV. I then review a recent work by Mare\v{s}, Friedman and Gal in which $\bar K$-nuclear bound states are generated dynamically across the periodic table, using a RMF Lagrangian that couples the $\bar K$ to the scalar and vector meson fields mediating the nuclear interactions. Substantial polarization of the core nucleus is found for light nuclei, with central nuclear densities enhanced by almost a factor of two. The binding energies and widths calculated in this dynamical model differ appreciably from those calculated for a static nucleus. These calculations provide a lower limit of $\Gamma_{\bar K} \sim 50 \pm 10$ MeV on the width of nuclear bound states for $\bar K$ binding energy in the range $B_{\bar K} = 100 - 200$ MeV.
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"abstract": "Following the prediction by Akaishi and Yamazaki of relatively narrow $\\bar\nK$-nuclear states, deeply bound by over 100 MeV where the main decay channel\n$\\bar K N \\to \\pi \\Sigma$ is closed, several experimental signals in stopped\n$K^-$ reactions on light nuclei have been interpreted recently as due to such\nstates. In this talk I review (i) the evidence from $K^-$-atom data for a {\\it\ndeep} $\\bar K$-nucleus potential, as attractive as $V_{\\bar K}(\\rho_0) \\sim\n-(150 - 200)$ MeV at nuclear matter density, that could support such states;\nand (ii) the theoretical arguments for a {\\it shallow} potential, $V_{\\bar\nK}(\\rho_0) \\sim -(40 - 60)$ MeV. I then review a recent work by Mare\\v{s},\nFriedman and Gal in which $\\bar K$-nuclear bound states are generated\ndynamically across the periodic table, using a RMF Lagrangian that couples the\n$\\bar K$ to the scalar and vector meson fields mediating the nuclear\ninteractions. Substantial polarization of the core nucleus is found for light\nnuclei, with central nuclear densities enhanced by almost a factor of two. The\nbinding energies and widths calculated in this dynamical model differ\nappreciably from those calculated for a static nucleus. These calculations\nprovide a lower limit of $\\Gamma_{\\bar K} \\sim 50 \\pm 10$ MeV on the width of\nnuclear bound states for $\\bar K$ binding energy in the range $B_{\\bar K} = 100\n- 200$ MeV.",
"arxiv_id": "nucl-th/0604067",
"authors": [
"Avraham Gal"
],
"categories": [
"nucl-th"
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"doi": "10.1142/S0218301307006368",
"journal_ref": "Int.J.Mod.Phys.E16:891-903,2007",
"title": "$\\bar K$-Nuclear Deeply Bound States?",
"url": "https://arxiv.org/abs/nucl-th/0604067"
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