TY - JOUR
T1 - Particle- γ coincidence spectroscopy of the N = 90 nucleus 154Gd by (p, tγ)
AU - Allmond, J. M.
AU - Beausang, C. W.
AU - Ross, null
AU - Humby, null
AU - Basunia, S.
AU - Bernstein, L. A.
AU - Bleuel, D. L.
AU - Brooks, null
AU - Brown, null
AU - Burke, J. T.
AU - Darakchieva, null
AU - Dudziak, null
AU - Evans, null
AU - Fallon, P.
AU - Jeppesen, H. B.
AU - LeBlanc, null
AU - Lesher, S. R.
AU - McMahan, M. A.
AU - Meyer, null
AU - Phair, L.
AU - Rasmussen, null
AU - Scielzo, N. D.
AU - Stroberg, null
AU - Wiedeking, M.
PY - 2017/3/1
Y1 - 2017/3/1
N2 - 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.
AB - 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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U2 - 10.1140/epja/i2017-12253-2
DO - 10.1140/epja/i2017-12253-2
M3 - Article
SN - 1434-6001
VL - 53
JO - European Physical Journal A
JF - European Physical Journal A
IS - 3
M1 - 62
ER -