Multipole mixing ratios of transitions out of high spin gamma vibrational states in neutron rich Mo, Ru isotopes
Loading...
Date
2010-04-27
Authors
Journal Title
Journal ISSN
Volume Title
Publisher
Vanderbilt University. Dept. of Physics and Astronomy
Abstract
Current models of nuclear structure describe nuclear states in terms of
collective vibrations and rotations of a ground state. - One such quadrupole
vibrational band is the gamma-band formed by vibrations of the short sides
of a deformed nucleus. - When a nucleus that is in this mode decays to its
ground state, the electromagnetic radiation is predicted to be entirely
quadrupole in nature. - This prediction has been well documented in a wide
range of nuclei. - However, a recent study of neutron rich molybdenum and
ruthenium isotopes found a few gamma-band to ground-band transitions that
contained almost no quadrupole radiation. - This work utilizes the
Gammasphere detector array to examine the angular correlations in the
de-excitations of the secondary fission fragments of 252Cf in order to make
independent measurements of these results. - This work also uses the same
technique to measure the multipole mixing ratios of gamma-band to
ground-band transitions originating in states with spin-parity as high as
9+. - The results demonstrate that in these nuclei, electric quadrupole
radiation is strongly favored in gamma to ground band transitions as has
been predicted by theory.
Description
Highest Honors in Physics
Keywords
Nuclear deformation, Neutron-rich, Multipole mixing ratios, High spin, Gamma vibrational states, Mo, Ru isotopes