Abstract
We observe for the first time rotational bands of enhanced deformation (ED) in 127 Pr and 128 Pr, and suggest that these bands are built upon πg 9/2 ( [404] 9 2 ) in 127 Pr and on the πg 9/2 νh 11/2 orbitals in 128 Pr. These are the lightest isotopes of Pr for which ED bands have been observed. A contrasting trend in the dynamical moments of inertia ( J (2) ) versus N is observed at low frequencies for the “normal-deformed” πh 11/2 and “enhanced-deformed” πg 9/2 bands of 127 –131 Pr both experimentally and in self-consistent Woods-Saxon calculations. The trends in J (2) and β 2 are correlated with a decreasing probability for pair scattering into the deformation-driving νh 9/2/ f 7/2 ( [541] 1 2 ) orbital.
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