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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
general
Nuclear isomers in superheavy elements as stepping stones towards the island of stability
Nature, Volume 442, No. 7105, Year 2006
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Description
A long-standing prediction of nuclear models is the emergence of a region of long-lived, or even stable, superheavy elements beyond the actinides. These nuclei owe their enhanced stability to closed shells in the structure of both protons and neutrons. However, theoretical approaches to date do not yield consistent predictions of the precise limits of the 'island of stability'; experimental studies are therefore crucial. The bulk of experimental effort so far has been focused on the direct creation of superheavy elements in heavy ion fusion reactions, leading to the production of elements up to proton number Z = 118 (refs 4, 5). Recently, it has become possible to make detailed spectroscopic studies of nuclei beyond fermium (Z = 100), with the aim of understanding the underlying single-particle structure of superheavy elements. Here we report such a study of the nobelium isotope 254No, with 102 protons and 152 neutrons - the heaviest nucleus studied in this manner to date. We find three excited structures, two of which are isomeric (metastable). One of these structures is firmly assigned to a two-proton excitation. These states are highly significant as their location is sensitive to single-particle levels above the gap in shell energies predicted at Z = 114, and thus provide a microscopic benchmark for nuclear models of the superheavy elements. © 2006 Nature Publishing Group.
Authors & Co-Authors
Herzberg, Rolf Dietmar
United Kingdom, Liverpool
University of Liverpool
Greenlees, P. T.
Finland, Jyvaskyla
University of Jyväskylä
Butler, Peter A.
United Kingdom, Liverpool
University of Liverpool
Venhart, Martin
Slovakia, Bratislava
Univerzita Komenského V Bratislave
Darby, I. G.
United Kingdom, Liverpool
University of Liverpool
Eeckhaudt, S.
Finland, Jyvaskyla
University of Jyväskylä
Eskola, Kari J.
Finland, Helsinki
Helsingin Yliopisto
Grahn, Tuomas
Finland, Jyvaskyla
University of Jyväskylä
Gray-Jones, C.
United Kingdom, Liverpool
University of Liverpool
Heßberger, Fritz Peter
Germany, Darmstadt
Gsi Helmholtz Centre for Heavy Ion Research Gmbh
Jones, P. M.
Finland, Jyvaskyla
University of Jyväskylä
Julin, Rauno
Finland, Jyvaskyla
University of Jyväskylä
Juutinen, Sakari
Finland, Jyvaskyla
University of Jyväskylä
Ketelhut, S.
Finland, Jyvaskyla
University of Jyväskylä
Korten, Wolfram
France, Gif-sur-yvette
Département de Physique Nucléaire
Leino, Matti E.
Finland, Jyvaskyla
University of Jyväskylä
Leppänen, Ari Pekka
Finland, Jyvaskyla
University of Jyväskylä
Nyman, Markus
Finland, Jyvaskyla
University of Jyväskylä
Page, Robert D.
United Kingdom, Liverpool
University of Liverpool
Pakarinen, Janne
United Kingdom, Liverpool
University of Liverpool
Finland, Jyvaskyla
University of Jyväskylä
Rahkila, Panu M.
Finland, Jyvaskyla
University of Jyväskylä
Sarén, Jan J.
Finland, Jyvaskyla
University of Jyväskylä
Scholey, Catherine S.
Finland, Jyvaskyla
University of Jyväskylä
Theisen, Ch
France, Gif-sur-yvette
Département de Physique Nucléaire
Uusitalo, Juha
Finland, Jyvaskyla
University of Jyväskylä
Statistics
Citations: 183
Authors: 25
Affiliations: 7
Identifiers
Doi:
10.1038/nature05069
ISSN:
00280836
Research Areas
Cancer