Nuclear Structure Studies in Isotopes of Nickel and Iron
- 1 September 1963
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review B
- Vol. 131 (5), 2133-2140
- https://doi.org/10.1103/physrev.131.2133
Abstract
The levels of , , , , and are studied with () reactions; angular distributions and absolute cross sections are analyzed with the aid of distorted-wave Born-approximation calculations. Essentially all levels in the odd isotopes up to about 1-MeV binding energy are assigned to a shell-model state and their reduced widths are measured. From this, the "center of gravity" of each shell-model state is determined; the results for , which has one neutron above a closed shell, are MeV, MeV, MeV, MeV, MeV, and MeV. The shell-model states in the Ni isotopes follow the same energy ordering except that the state decreases in energy to become the ground state of , but the energy range of the spectra is compressed for greater neutron excess. The , , and states increase in "fullness' with increasing neutron excess, while the other states remain completely empty. The widths of the energy distributions of levels belonging to single shell-model states agree well with the predictions of the giant resonance theory of Lane, Thomas, and Wigner.
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