Study of Isomeric States in 198,200,202,206 Pb and 206 Hg Populated in Fragmentation Reactions

Natasa Lalovic,Dirk Rudolph,Z. Podolyak, Luis Sarmiento Pico,E.C. Simpson,T. Alexander,M.L. Cortés,J. Gerl,P. Golubev,F. Ameil,T. Arici, C. Bauer,D. Bazzacco,M. A. Bentley,P. Boutachkov,M. Bowry,Claes Fahlander,A. Gadea,Jnaneswari Gellanki, A. 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.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. Sachis, J. Simpson

JOURNAL OF PHYSICS G-NUCLEAR AND PARTICLE PHYSICS（2018）

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摘要

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

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关键词

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

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