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Saturation of low-energy antiproton annihilation on nuclei | | A. Gal
; E. Friedman
; C.J. Batty
; | | Date: |
13 Jul 2000 | | Journal: | Phys.Lett. B491 (2000) 219-224 | | Subject: | nucl-th hep-ph | | Affiliation: | Hebrew U.), E. Friedman (Henrew U.), C.J. Batty (RAL | | Abstract: | Recent measurements of very low-energy ($p_{L}<100$ MeV/c) $ar p$ annihilation on light nuclei reveal apparent suppression of annihilation upon increasing the atomic charge $Z$ and mass number $A$. Using $ar p$-nucleus optical potentials $V_{{
m opt}}$, fitted to $ar p$-atom energy-shifts and -widths, we resolve this suppression as due to the strong effective repulsion produced by the very absorptive $V_{{
m opt}}$. The low-energy $ar p$-nucleus wavefunction is kept substantially outside the nuclear surface and the resulting reaction cross section saturates as function of the strength of Im $V_{{
m opt}}$. This feature, for $E >0$, parallels the recent prediction, for $E < 0$, that the level widths of $ar p$ atoms saturate and, hence, that $ar p$ deeply bound atomic states are relatively narrow. Antiproton annihilation cross sections are calculated at $p_{L}=57$ MeV/c across the periodic table, and their dependence on $Z$ and $A$ is classified and discussed with respect to the Coulomb focussing effect at very low energies. | | Source: | arXiv, nucl-th/0007029 | | Services: | Forum | Review | PDF | Favorites | |
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