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- Title
Shifted Identical Bands: A New Phenomenon.
- Authors
Jones, E. F.; Gore, P. M.; Hamilton, J. H.; Ramayya, A. V.; de Lima, A. P.; Dodder, R. S.; Kormicki, J.; Hwang, J. K.; Beyer, C. J.; Zhang, X. Q.; Zhu, S. J.; Ter-Akopian, G. M.; Oganessian, Yu. Ts.; Daniel, A. V.; Rasmussen, J. O.; Lee, I. Y.; Cole, J. D.; Drigert, M. W.; Ma, W.-C.
- Abstract
The levels in [sup 162]Gd were identified in spontaneous fission studies. Its transition energies are remarkably similar to those in [sup 160]Gd. From that work, an analysis of yrast bands in even-even proton to neutron-rich Ba to Pb nuclei led to the discovery of a new phenomenon, shifted identical bands (SIB). SIBs are yrast bands in neighboring nuclei (a, b) with moments of inertia which are identical when shifted by a constant amount κ, so J[sub 1a](1 + κ) = J[sub 1b], from 2[sup +] to 8[sup +] and higher to 16[sup +]. Out of over 700 comparisons, 55 SIBs were found from stable to the most neutron-rich Ce-W nuclei with &κmacr; between 1.5% and 13%, where the spread in κ is less than ±1%, and only four identical bands (&κmacr; ≅ 0). As examples, we found for [sup 158]Sm-[sup 160]Gd, &κmacr; = (-3.2[sup +0.1, sub -0.2]) % (where the ± is the total spread in κ from -3.1 to -3.4); [sup 156]Nd-[sup 160]Gd, 10 (-10.6 [sup +0.4, sub 0.2])%; [sup 158]Sm-[sup 160]Sm, (3.4[sup +0.5, sub -0.3])%. The J[sub 1] values were fitted to a variable moment of inertia model with parameters J[sub 0] and C whose values correlate with the SIB J[sub 1] values. The SIBs are not correlated either with deformation or with the N[sub p]N[sub n] product of the IBA model.
- Subjects
ENERGY level densities; GADOLINIUM isotopes; SPONTANEOUS fission
- Publication
Physics of Atomic Nuclei, 2001, Vol 64, Issue 7, p1157
- ISSN
1063-7788
- Publication type
Article
- DOI
10.1134/1.1389535