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  • Stahl, C. (author)

Population of the 2(ms)(+) mixed-symmetry state of Ba-140 with the alpha-transfer reaction

  • E-article/E-chapterEnglish2015

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  • 2015

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  • LIBRIS-ID:20194045
  • http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-267196uri
  • urn:nbn:se:uu:diva-267196urn
  • 10.1103/PhysRevC.92.044324doi

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  • Language:English

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  • Published
  • EU, Europeiska forskningsrådet
  • gratis
  • Background: Identification of proton-neutron mixed-symmetric one-quadrupole phonon excitations (the 2(ms)(+) states) of atomic nuclei provides information on the isovector part of the residual nucleon-nucleon interaction. It was predicted that the 2(ms)(+) state of particular nuclei close to the U(5) limit of the interacting boson model, in particular Ba-140, should be considerably populated by alpha-transfer reactions [C. E. Alonso et al., Phys. Rev. C 78, 017301 (2008)]. Purpose: We aim at the identification of the 2(ms)(+) mixed-symmetry state (MSS) of radioactive Ba-140 and investigate its population by the alpha-transfer reaction as a suitable tool to selectively populate MSSs and as a potential new signature for its mixed-symmetric character. Method: A gamma-ray spectroscopy experiment was performed in inverse kinematics in order to populate the 2(ms)(+) state of Ba-140 by alpha-transfer from a C-nat target on Xe-136 beam ions. The population of the candidate for the 2(ms)(+) state of Ba-140 was measured relative to the population of the 2(1)(+) state. Results: The candidate for the 2(ms)(+) state of Ba-140 was populated by a transfer three times weaker than predicted. Another 2(+) state that can be ruled out as the MSS was in turn as strongly populated by the a transfer as predicted for the MSS. Conclusions: The relative population of 2(+) states by alpha-transfer cannot serve as a new signature for MSSs, since other 2(+) states are also strongly populated. Nevertheless, the substantial population of the MSS candidate of Ba-140 by alpha transfer qualifies this type of reaction as suitable tool to excite MSSs and study their electromagnetic decay properties.

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  • Leske, J. (author)
  • Bauer, C. (author)
  • Bazzacco, D. (author)
  • Farnea, E. (author)
  • Gottardo, A. (author)
  • John, P. R. (author)
  • Michelagnoli, C. (author)
  • Pietralla, N. (author)
  • Reese, M. (author)
  • Sahin, E. (author)
  • Birkenbach, B. (author)
  • Bracco, A. (author)
  • Crespi, F. C. L. (author)
  • de Angelis, G. (author)
  • Desesquelles, P. (author)
  • Eberth, J. (author)
  • Gadea, A. (author)
  • Goergen, A. (author)
  • Grebosz, J. (author)
  • Hess, H. (author)
  • Jolie, J. (author)
  • Jungclaus, A. (author)
  • Korten, W. (author)
  • Lenzi, S. M. (author)
  • Lunardi, S. (author)
  • Menegazzo, R. (author)
  • Mengoni, D. (author)
  • Modamio, V. (author)
  • Napoli, D. R. (author)
  • Pullia, A. (author)
  • Quintana, B. (author)
  • Recchia, F. (author)
  • Reiter, P. (author)
  • Rosso, D. (author)
  • Salsac, M. D. (author)
  • Söderström, Pär. -A (author)
  • Stezowski, O. (author)
  • Theisen, Ch. (author)
  • Ur, C. A. (author)
  • Valiente-Dobon, J. J. (author)
  • Uppsala universitetTeknisk-naturvetenskapliga vetenskapsområdet (publisher)

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  • Part of/supplement to:channel record
  • In:VärdpublikationPhysical Review C. Nuclear Physics92:40556-2813

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