dorsal/arxiv
View SchemaStability and Production of Superheavy Nuclei
| Authors | Peter Moller, J. Rayford Nix |
|---|---|
| Categories | |
| ArXiv ID | nucl-th/9709016 |
| URL | https://arxiv.org/abs/nucl-th/9709016 |
| DOI | 10.1063/1.55136 |
Abstract
Beyond uranium heavy elements rapidly become increasingly unstable with respect to spontaneous fission as the proton number Z increases, because of the disruptive effect of the long-range Coulomb force. However, in the region just beyond Z = 100 magic proton and neutron numbers and the associated shell structure enhances nuclear stability sufficiently to allow observation of additional nuclei. Some thirty years ago it was speculated that an island of spherical, relatively stable superheavy nuclei would exist near the next doubly magic proton-neutron combination beyond 208:Pb, that is, at proton number Z = 114 and neutron number N = 184. Theory and experiment now show that there also exists a rock of stability in the vicinity of Z = 110 and N = 162 between the actinide region, which previously was the end of the peninsula of known elements, and the predicted island of spherical superheavy nuclei slightly southwest of the magic numbers Z = 114 and N = 184. We review here the stability properties of the heavy region of nuclei. Just as the decay properties of nuclei in the heavy region depend strongly on shell structure, this structure also dramatically affects the fusion entrance channel. The six most recently discovered new elements were all formed in cold-fusion reactions. We discuss here the effect of the doubly magic structure of the target in cold-fusion reactions on the fusion barrier and on dissipation.
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"abstract": "Beyond uranium heavy elements rapidly become increasingly unstable with\nrespect to spontaneous fission as the proton number Z increases, because of the\ndisruptive effect of the long-range Coulomb force. However, in the region just\nbeyond Z = 100 magic proton and neutron numbers and the associated shell\nstructure enhances nuclear stability sufficiently to allow observation of\nadditional nuclei. Some thirty years ago it was speculated that an island of\nspherical, relatively stable superheavy nuclei would exist near the next doubly\nmagic proton-neutron combination beyond 208:Pb, that is, at proton number Z =\n114 and neutron number N = 184. Theory and experiment now show that there also\nexists a rock of stability in the vicinity of Z = 110 and N = 162 between the\nactinide region, which previously was the end of the peninsula of known\nelements, and the predicted island of spherical superheavy nuclei slightly\nsouthwest of the magic numbers Z = 114 and N = 184. We review here the\nstability properties of the heavy region of nuclei. Just as the decay\nproperties of nuclei in the heavy region depend strongly on shell structure,\nthis structure also dramatically affects the fusion entrance channel. The six\nmost recently discovered new elements were all formed in cold-fusion reactions.\nWe discuss here the effect of the doubly magic structure of the target in\ncold-fusion reactions on the fusion barrier and on dissipation.",
"arxiv_id": "nucl-th/9709016",
"authors": [
"Peter Moller",
"J. Rayford Nix"
],
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"nucl-th"
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"doi": "10.1063/1.55136",
"title": "Stability and Production of Superheavy Nuclei",
"url": "https://arxiv.org/abs/nucl-th/9709016"
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