dorsal/arxiv
View Schema$K^-$ and $\bar p$ deeply bound atomic states
| Authors | E. Friedman, A. Gal |
|---|---|
| Categories | |
| ArXiv ID | nucl-th/9907052 |
| URL | https://arxiv.org/abs/nucl-th/9907052 |
| DOI | 10.1016/S0375-9474(99)00360-7 |
| Journal | Nucl.Phys. A658 (1999) 345-361 |
Abstract
The strongly absorptive optical potentials $V_{{\rm opt}}$ which have been deduced from the strong-interaction level shifts and widths in X-ray spectra of $K^-$ and $\bar p$ atoms produce effective repulsion leading to substantial suppression of the {\it atomic} wave functions within the nucleus. The width of atomic levels then saturates as function of the strength of Im $V_{{\rm opt}}$. We find that `deeply bound' atomic states, which are inaccessible in the atomic cascade process, are generally narrow, due to this mechanism, over the entire periodic table %reaching values of $\Gamma_{K^-} \sim 1.7$ MeV and %$\Gamma_{\bar p} \sim 1.9$ MeV for the $1s$ state in Pb, and should be reasonably well resolved. These predictions are insensitive to $V_{{\rm opt}}$, provided it was fitted to the observed X-ray spectra. In contrast, the {\it nuclear} states bound by $V_{{\rm opt}}$ are very broad and their spectrum depends sensitively on details of $V_{{\rm opt}}$. We discuss production reactions for $K^-$ atomic states using slow $K^-$ mesons from the decay of the $\phi$(1020) vector meson, and the ($\bar p, p$) reaction for $\bar p$ atomic states. Rough cross-section estimates are given.
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"abstract": "The strongly absorptive optical potentials $V_{{\\rm opt}}$ which have been\ndeduced from the strong-interaction level shifts and widths in X-ray spectra of\n$K^-$ and $\\bar p$ atoms produce effective repulsion leading to substantial\nsuppression of the {\\it atomic} wave functions within the nucleus. The width of\natomic levels then saturates as function of the strength of Im $V_{{\\rm opt}}$.\nWe find that `deeply bound\u0027 atomic states, which are inaccessible in the atomic\ncascade process, are generally narrow, due to this mechanism, over the entire\nperiodic table %reaching values of $\\Gamma_{K^-} \\sim 1.7$ MeV and\n%$\\Gamma_{\\bar p} \\sim 1.9$ MeV for the $1s$ state in Pb, and should be\nreasonably well resolved. These predictions are insensitive to $V_{{\\rm opt}}$,\nprovided it was fitted to the observed X-ray spectra. In contrast, the {\\it\nnuclear} states bound by $V_{{\\rm opt}}$ are very broad and their spectrum\ndepends sensitively on details of $V_{{\\rm opt}}$. We discuss production\nreactions for $K^-$ atomic states using slow $K^-$ mesons from the decay of the\n$\\phi$(1020) vector meson, and the ($\\bar p, p$) reaction for $\\bar p$ atomic\nstates. Rough cross-section estimates are given.",
"arxiv_id": "nucl-th/9907052",
"authors": [
"E. Friedman",
"A. Gal"
],
"categories": [
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"doi": "10.1016/S0375-9474(99)00360-7",
"journal_ref": "Nucl.Phys. A658 (1999) 345-361",
"title": "$K^-$ and $\\bar p$ deeply bound atomic states",
"url": "https://arxiv.org/abs/nucl-th/9907052"
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