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Possible Quenching of Static Neutron Pairing Near the N = 98


Hartley, D. J.; Villafana, K.; Kondev, F. G.; Riley, M. A.; Janssens, R.; Auranen, K.; Ayangeakaa, A. D.; Baron, J. S.; Boston, A. J.; Carpenter, M. P.; Clark, J. A.; Greene, J. P.; Hoffman, C. R.; Lauritsen, T.; Savard, G.; Seweryniak, D.; Stolze, S.; Wu, J.


A Gd-160 beam was accelerated to an energy of 1000 MeV and, separately, bombarded thick targets of Sm-154 and Dy-164 in order to observe neutron-rich, rare-earth nuclei via deep-inelastic collision processes. Gammasphere was utilized to observe gamma-ray emissions. Many new states and transitions were observed in Gd-160 as a result of so-called unsafe Coulomb excitation. The ground-state band in Gd-160 has been extended to I-pi= 20(+) and a rotational band based on the K-pi = 4(+) state, previously associated with a hexadecapole vibration, was observed up to 18(+). The quasiparticle configuration of the K-pi = 4(+) band has been determined, and its unusual alignment behavior may result from a possible quenching of static neutron pairing. In addition, the band based on the [525/2 quasineutron orbital in Gd-161 was extended from 11/2(-) to 33/2(-) and also displays the same unusual alignment behavior.



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