dorsal/arxiv
View SchemaMicroscopic Enhancement of Heavy-Element Production
| Authors | P. Moller, J. R. Nix, P. Armbruster, S. Hofmann, G. Munzenberg |
|---|---|
| Categories | |
| ArXiv ID | nucl-th/9704015 |
| URL | https://arxiv.org/abs/nucl-th/9704015 |
| DOI | 10.1007/s002180050399 |
Abstract
Realistic fusion barriers are calculated in a macroscopic-microscopic model for several soft-fusion heavy-ion reactions leading to heavy and superheavy elements. The results obtained in such a realistic picture are very different from those obtained in a purely macroscopic model. For reactions on 208:Pb targets, shell effects in the entrance channel result in fusion-barrier energies at the touching point that are only a few MeV higher than the ground state for compound systems near Z = 110. The entrance-channel fragment-shell effects remain far inside the touching point, almost to configurations only slightly more elongated than the ground-state configuration, where the fusion barrier has risen to about 10 MeV above the ground-state energy. Calculated single-particle level diagrams show that few level crossings occur until the peak in the fusion barrier very close to the ground-state shape is reached, which indicates that dissipation is negligible until very late in the fusion process. Whereas the fission valley in a macroscopic picture is several tens of MeV lower in energy than is the fusion valley, we find in the macroscopic-microscopic picture that the fission valley is only about 5 MeV lower than the fusion valley for soft-fusion reactions leading to compound systems near Z = 110. These results show that no significant ``extra-extra-push'' energy is needed to bring the system inside the fission saddle point and that the typical reaction energies for maximum cross section in heavy-element synthesis correspond to only a few MeV above the maximum in the fusion barrier.
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"abstract": "Realistic fusion barriers are calculated in a macroscopic-microscopic model\nfor several soft-fusion heavy-ion reactions leading to heavy and superheavy\nelements. The results obtained in such a realistic picture are very different\nfrom those obtained in a purely macroscopic model. For reactions on 208:Pb\ntargets, shell effects in the entrance channel result in fusion-barrier\nenergies at the touching point that are only a few MeV higher than the ground\nstate for compound systems near Z = 110. The entrance-channel fragment-shell\neffects remain far inside the touching point, almost to configurations only\nslightly more elongated than the ground-state configuration, where the fusion\nbarrier has risen to about 10 MeV above the ground-state energy. Calculated\nsingle-particle level diagrams show that few level crossings occur until the\npeak in the fusion barrier very close to the ground-state shape is reached,\nwhich indicates that dissipation is negligible until very late in the fusion\nprocess. Whereas the fission valley in a macroscopic picture is several tens of\nMeV lower in energy than is the fusion valley, we find in the\nmacroscopic-microscopic picture that the fission valley is only about 5 MeV\nlower than the fusion valley for soft-fusion reactions leading to compound\nsystems near Z = 110. These results show that no significant\n``extra-extra-push\u0027\u0027 energy is needed to bring the system inside the fission\nsaddle point and that the typical reaction energies for maximum cross section\nin heavy-element synthesis correspond to only a few MeV above the maximum in\nthe fusion barrier.",
"arxiv_id": "nucl-th/9704015",
"authors": [
"P. Moller",
"J. R. Nix",
"P. Armbruster",
"S. Hofmann",
"G. Munzenberg"
],
"categories": [
"nucl-th"
],
"doi": "10.1007/s002180050399",
"title": "Microscopic Enhancement of Heavy-Element Production",
"url": "https://arxiv.org/abs/nucl-th/9704015"
},
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