Shifted identical bands: A new phenomenon

Citation
Ef. Jones et al., Shifted identical bands: A new phenomenon, PHYS ATOM N, 64(7), 2001, pp. 1157-1164
Citations number
6
Categorie Soggetti
Physics
Journal title
PHYSICS OF ATOMIC NUCLEI
ISSN journal
10637788 → ACNP
Volume
64
Issue
7
Year of publication
2001
Pages
1157 - 1164
Database
ISI
SICI code
1063-7788(200107)64:7<1157:SIBANP>2.0.ZU;2-C
Abstract
The levels in Gd-162 were identified in spontaneous fission studies. Its tr ansition energies are remarkably similar to those in Gd-160. From that work , an analysis of yrast bands in even-even proton to neutron-rich Ba to Ph n uclei led to the discovery of a new phenomenon, shifted identical hands (SI B). SIBs are yrast bands in neighboring nuclei (a, b) with moments of inert ia which are identical when shifted by a constant amount kappa, so J(1a)(1 + kappa) = J(1b), from 2(+) to 8(+) and higher to 16(+). Out of over 700 co mparisons, 55 SIBs were found from stable to the most neutron-rich Ce-W nuc lei with \<(<kappa>)over bar>\ between 1.5% and 13%, where the spread in ka ppa is less than +/-1%, and only four identical bands (<(<kappa>)over bar> congruent to 0). As examples, we found for Sm-158-Gd-160, <(<kappa>)over ba r> = (-3.2(-0.2)(+0.1))% (where the +/- is the total spread in kappa from - 3.1 to -3.4); Nd-156-Gd-160, (-10.6(-0.2)(+0.4))%; Sm-158-Sm-160, (3.4(-0.3 )(+0.5))%. The J(1) values were fitted to a variable moment of inertia mode l with parameters J(0) and C whose values correlate with the SIB J(1) value s. The SIBs are not correlated either with deformation or with the NpNn pro duct of the IBA model. (C) 2001 MAIK "Nauka/Interperiodica".