| | |
| | |
Stat |
Members: 3643 Articles: 2'488'730 Articles rated: 2609
29 March 2024 |
|
| | | |
|
Article overview
| |
|
Unified optical-model approach to low-energy antiproton annihilation on nuclei and to antiprotonic atoms | C.J. Batty
; E. Friedman
; A. Gal
; | Date: |
2 Oct 2000 | Journal: | Nucl.Phys. A689 (2001) 721-740 | Subject: | nucl-th | Affiliation: | RAL), E. Friedman (Hebrew U), A. Gal (Hebrew U | Abstract: | A successful unified description of $ar p$ nuclear interactions near E=0 is achieved using a $ar p$ optical potential within a folding model, $V_{{
m opt}} sim ar v * {
ho}$, where a $ar p p$ potential $ar v$ is folded with the nuclear density $
ho$. The potential $ar v$ fits very well the measured $ar p p$ annihilation cross sections at low energies ($p_L < 200$ MeV/c) and the $1s$ and $2p$ spin-averaged level shifts and widths for the $ar p$H atom. The density-folded optical potential $V_{{
m opt}}$ reproduces satisfactorily the strong-interaction level shifts and widths over the entire periodic table, for $A > 10$, as well as the few low energy $ar p$ annihilation cross sections measured on Ne. Both $ar v$ and $V_{{
m opt}}$ are found to be highly absorptive, which leads to a saturation of reaction cross sections in hydrogen and on nuclei. Predictions are made for $ar p$ annihilation cross sections over the entire periodic table at these very low energies and the systematics of the calculated cross sections as function of $A$, $Z$ and $E$ is discussed and explained in terms of a Coulomb-modified strong-absorption model. Finally, optical potentials which fit simultaneously low-energy $ar p - ^4$He observables for $E < 0$ as well as for $E > 0$ are used to assess the reliability of extracting Coulomb modified $ar p$ nuclear scattering lengths directly from the data. The relationship between different kinds of scattering lengths is discussed and previously published systematics of the $ar p$ nuclear scattering lengths is updated. | Source: | arXiv, nucl-th/0010006 | Services: | Forum | Review | PDF | Favorites |
|
|
No review found.
Did you like this article?
Note: answers to reviews or questions about the article must be posted in the forum section.
Authors are not allowed to review their own article. They can use the forum section.
browser claudebot
|
| |
|
|
|
| News, job offers and information for researchers and scientists:
| |