Study of isomeric states in 198,200,202,206 Pb and 206 Hg populated in fragmentation reactions

The Agata Collaboration, N. Lalović, D. Rudolph, Zs Podolyák, L. G. Sarmiento, E. C. Simpson, T. Alexander, M. L. Cortés, J. Gerl, P. Golubev, F. Ameil, T. Arici, Ch Bauer, D. Bazzacco, M. A. Bentley, P. Boutachkov, M. Bowry, C. Fahlander, A. Gadea, J. GellankiA. Givechev, N. Goel, M. Górska, A. Gottardo, E. Gregor, G. Guastalla, T. Habermann, M. Hackstein, A. Jungclaus, I. Kojouharov, R. Kumar, N. Kurz, M. Lettmann, C. Lizarazo, C. Louchart, E. Merchán, C. Michelagnoli, Th Moeller, K. Moschner, Z. Patel, N. Pietralla, S. Pietri, D. Ralet, M. Reese, P. H. Regan, P. Reiter, H. Schaffner, P. Singh, C. Stahl, R. Stegmann, O. Stezowski, J. Taprogge, P. Thöle, A. Wendt, O. Wieland, E. Wilson, R. Wood, H. J. Wollersheim, B. Birkenbach, B. Bruyneel, I. Burrows, E. Clément, P. Désesquelles, C. Domingo-Pardo, J. Eberth, V. González, H. Hess, J. Jolie, D. S. Judson, R. Menegazzo, D. Mengoni, D. R. Napoli, A. Pullia, B. Quintana, G. Rainovski, M. D. Salsac, E. Sanchis, J. Simpson, J. J.Valiente Dóbon

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Isomeric states in isotopes in the vicinity of doubly-magic 208 Pb were populated following reactions of a relativistic 208 Pb primary beam impinging on a 9 Be fragmentation target. Secondary beams of 198,200,202,206 Pb and 206 Hg were isotopically separated and implanted in a passive stopper positioned in the focal plane of the GSI Fragment Separator. Delayed γ rays were detected with the Advanced Gamma Tracking Array (AGATA). Decay schemes were re-evaluated and interpreted with shell-model calculations. The momentum-dependent population of isomeric states in the two-nucleon hole nuclei 206 Pb/ 206 Hg was found to differ from the population of multi neutron-hole isomeric states in 198,200,202 Pb.

Original languageEnglish
Article number035105
JournalJournal of Physics G: Nuclear and Particle Physics
Issue number3
Publication statusPublished - 12 Feb 2018

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  • γ-ray spectroscopy, relativistic projectile fragmentation, direct reactions, isomeric decays, electromagnetic transitions, nuclear shell model

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