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Particle- γ coincidence spectroscopy of the N = 90 nucleus 154Gd by (p, tγ)

  • Author(s): Allmond, JM;
  • Beausang, CW;
  • Ross, TJ;
  • Humby, P;
  • Basunia, MS;
  • Bernstein, LA;
  • Bleuel, DL;
  • Brooks, W;
  • Brown, N;
  • Burke, JT;
  • Darakchieva, BK;
  • Dudziak, KR;
  • Evans, KE;
  • Fallon, P;
  • Jeppesen, HB;
  • LeBlanc, JD;
  • Lesher, SR;
  • McMahan, MA;
  • Meyer, DA;
  • Phair, L;
  • Rasmussen, JO;
  • Scielzo, ND;
  • Stroberg, SR;
  • Wiedeking, M
  • et al.
Abstract

A segmented Si-telescope and HPGe array, STARS-LIBERACE, was used to study the 156Gd(p, tγ)154Gd direct reaction by particle- γ 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 Kπ=01+,21+ and 02+, 22+ 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 0 + states below 2 Δ. This may account for a large number of the low-lying 0 + states observed in two-nucleon transfer reactions. A hypothesis for the origin of the 02+ and 03+ states is provided.

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