Multipole mixing ratios of transitions out of high spin gamma vibrational states in neutron rich Mo, Ru isotopes
Fenker, Benjamin
:
2010-04-27
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.
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