High-spin transition quadrupole moments in neutron-rich Mo and Ru nuclei: Testing γ softness?

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Journal Title, Volume, Page: 
Physics Letters B 723 61-65
Year of Publication: 
2013
Authors: 
J.B. Snyder
W. Reviol
D.G. Sarantites
A.V. Afanasjev
R.V.F. Janssens
H. Abusara
An-Najah National University
M.P. Carpenter
X. Chen
C.J. Chiara
J.P. Greene
T. Lauritsen
E.A. McCutchan
D. Seweryniak
S. Zhu
Preferred Abstract (Original): 
The transition quadrupole moments, Qt, of rotational bands in the neutron-rich, even-mass 102–108Mo and 108–112Ru nuclei were measured in the 8 to 16 ℏ spin range with the Doppler-shift attenuation method. The nuclei were populated as fission fragments from 252Cf fission. The detector setup consisted of the Gammasphere spectrometer and the HERCULES fast-plastic array. At moderate spin, the Qt moments are found to be reduced with respect to the values near the ground states. Attempts to describe the observations in mean-field-based models, specifically cranked relativistic Hartree-Bogoliubov theory, illustrate the challenge theory faces and the difficulty to infer information on γ softness and triaxiality from the data.