A new approach to finding magic numbers for heavy and superheavy elements
Creators
- 1. Emeritus of Nuclear Engineering, University of Virginia, Charlottesville, VA 22901 (United States)
Description
For at least 60 years, scientists have known that certain numbers of protons or neutrons in nuclei formed closed shells of some kind, producing additional stability to nuclei that possess these properties. The most stable nuclei, or nuclei exhibiting enhanced stability, are called doubly magic. Only recently, Lucas has explained that the magic numbers are really composites of several sub shells filling, rather than being single shells. In addition, his theory leads to a conclusion that protons and neutrons fill sub shells in a different way. This is because the protons are charged particles, and by Coulomb repulsion they try to get as far away from each other as possible, hence tending to occupy the outer regions of nuclei. Neutrons, being uncharged but possibly polarizable, tend to occupy both outer and inner shells and to possibly increase the number in an outer shell when the nuclei are heavy in a similar way to electrons filling in inner shells in the Lanthanide and Actinide series. Using these ideas, and following a simple modification of Lucas' geometrical packing scheme, individual candidates for new magic proton numbers and new magic neutron numbers have been identified. Amazingly, these new magic numbers correspond to the experimentally identified superheavy element distribution to a very large extent, and even correspond to magic numbers suggested using very sophisticated theoretical physics methods and computations. As an added bonus, the newly suggested magic numbers correspond to the long lived Thorium and Uranium isotopes, and to the Fermium isotopes, which may help explain the shape of the Peninsula of Heavy isotopes. They also suggest going back to reassess somewhat lighter isotopes to see if some magic effects have been missed.
Availability note (English)
Available from http://dx.doi.org/10.1016/j.anucene.2010.11.004Additional details
Identifiers
- DOI
- 10.1016/j.anucene.2010.11.004;
- PII
- S0306-4549(10)00393-2;
Publishing Information
- Journal Title
- Annals of Nuclear Energy (Oxford)
- Journal Volume
- 38
- Journal Issue
- 2-3
- Journal Page Range
- p. 238-242
- ISSN
- 0306-4549
- CODEN
- ANENDJ
INIS
- Country of Publication
- United Kingdom
- Country of Input or Organization
- International Atomic Energy Agency (IAEA)
- INIS RN
- 43031242
- Subject category
- S73: NUCLEAR PHYSICS AND RADIATION PHYSICS;
- Descriptors DEI
- CALCULATION METHODS; CHARGED PARTICLES; COULOMB FIELD; ELECTRONS; FERMIUM ISOTOPES; HEAVY NUCLEI; MAGIC NUCLEI; NEUTRONS; PROTONS; RARE EARTHS; SHELLS; STABILITY; THORIUM; TRANSACTINIDE ELEMENTS; URANIUM ISOTOPES
- Descriptors DEC
- ACTINIDES; BARYONS; ELECTRIC FIELDS; ELEMENTARY PARTICLES; ELEMENTS; FERMIONS; HADRONS; ISOTOPES; LEPTONS; METALS; NUCLEI; NUCLEONS; TRANSPLUTONIUM ELEMENTS; TRANSURANIUM ELEMENTS
Optional Information
- Copyright
- Copyright (c) 2010 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.