Particle- coincidence spectroscopy of the N = 90 nucleus 154Gd by ()
2017
A segmented Si-telescope and HPGe array, STARS-LIBERACE, was used to study the 156 Gd()154 Gd direct reaction by particle- coincidence spectroscopy. New cross sections with a 25MeV proton beam are reported and compared to previous (p,t) and (t,p) studies. Furthermore, additional evidence for coexisting and , configurations at N = 90 is presented. Direct and indirect population patterns of the low-lying states are also explored. Review of the new and existing evidence favors an interpretation based on a configuration-dependent pairing interaction. The weakening of monopole pairing strength and an increase in quadrupole pairing strength could bring 2p-2h states below . This may account for a large number of the low-lying states observed in two-nucleon transfer reactions. A hypothesis for the origin of the and states is provided.
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