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

. A segmented Si-telescope and HPGe array, STARS-LIBERACE, was used to study the 156 Gd( p , t γ ) 154 Gd 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 eviden...

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Bibliographic Details
Published in:The European physical journal. A, Hadrons and nuclei Hadrons and nuclei, 2017, Vol.53 (3), p.1-9
Main Authors: Allmond, J. M., Beausang, C. W., Ross, T. J., Humby, P., Basunia, M. S., Bernstein, L. A., Bleuel, D. L., Brooks, W., Brown, N., Burke, J. T., Darakchieva, B. K., Dudziak, K. R., Evans, K. E., Fallon, P., Jeppesen, H. B., LeBlanc, J. D., Lesher, S. R., McMahan, M. A., Meyer, D. A., Phair, L., Rasmussen, J. O., Scielzo, N. D., Stroberg, S. R., Wiedeking, M.
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Language:English
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Summary:. A segmented Si-telescope and HPGe array, STARS-LIBERACE, was used to study the 156 Gd( p , t γ ) 154 Gd 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 K π = 0 1 + , 2 1 + and 0 2 + , 2 2 + 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 0 2 + and 0 3 + states is provided.
ISSN:1434-6001
1434-601X
DOI:10.1140/epja/i2017-12253-2