dorsal/arxiv
View SchemaTarget mass number dependence of subthreshold antiproton production in proton-, deuteron- and alpha-particle-induced reactions
| Authors | H. Mueller, V. I. Komarov |
|---|---|
| Categories | |
| ArXiv ID | nucl-th/0502071 |
| URL | https://arxiv.org/abs/nucl-th/0502071 |
| DOI | 10.1088/0954-3899/31/5/001 |
| Journal | J.Phys. G31 (2005) 285-293 |
Abstract
Data from KEK on subthreshold $\bar{\mrm{p}}$ as well as on $\pi^\pm$ and $\mrm{K}^\pm$ production in proton-, deuteron- and $\alpha$-induced reactions at energies between 2.0 and 12.0 A GeV for C, Cu and Pb targets are described within a unified approach. We use a model which considers a nuclear reaction as an incoherent sum over collisions of varying numbers of projectile and target nucleons. It samples complete events and thus allows for the simultaneous consideration of all final particles including the decay products of the nuclear residues. The enormous enhancement of the $\bar{\mrm{p}}$ cross section, as well as the moderate increase of meson production in deuteron and $\alpha$ induced compared to proton-induced reactions, is well reproduced for all target nuclei. In our approach, the observed enhancement near the production threshold is mainly due to the contributions from the interactions of few-nucleon clusters by simultaneously considering fragmentation processes of the nuclear residues. The ability of the model to reproduce the target mass dependence may be considered as a further proof of the validity of the cluster concept.
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"abstract": "Data from KEK on subthreshold $\\bar{\\mrm{p}}$ as well as on $\\pi^\\pm$ and\n$\\mrm{K}^\\pm$ production in proton-, deuteron- and $\\alpha$-induced reactions\nat energies between 2.0 and 12.0 A GeV for C, Cu and Pb targets are described\nwithin a unified approach. We use a model which considers a nuclear reaction as\nan incoherent sum over collisions of varying numbers of projectile and target\nnucleons. It samples complete events and thus allows for the simultaneous\nconsideration of all final particles including the decay products of the\nnuclear residues. The enormous enhancement of the $\\bar{\\mrm{p}}$ cross\nsection, as well as the moderate increase of meson production in deuteron and\n$\\alpha$ induced compared to proton-induced reactions, is well reproduced for\nall target nuclei. In our approach, the observed enhancement near the\nproduction threshold is mainly due to the contributions from the interactions\nof few-nucleon clusters by simultaneously considering fragmentation processes\nof the nuclear residues. The ability of the model to reproduce the target mass\ndependence may be considered as a further proof of the validity of the cluster\nconcept.",
"arxiv_id": "nucl-th/0502071",
"authors": [
"H. Mueller",
"V. I. Komarov"
],
"categories": [
"nucl-th"
],
"doi": "10.1088/0954-3899/31/5/001",
"journal_ref": "J.Phys. G31 (2005) 285-293",
"title": "Target mass number dependence of subthreshold antiproton production in proton-, deuteron- and alpha-particle-induced reactions",
"url": "https://arxiv.org/abs/nucl-th/0502071"
},
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