Nuclear Structure "Southeast" Of Pb-208: Isomeric States In Hg-208 And Tl-209

N. Al-Dahan,Zs. Podolyak,P. H. Regan, M. Gorska,H. Grawe,K. H. Maier, J. Gerl,S. B. Pietri,H. J. Wollersheim,N. Alkhomashi,A. Y. Deo,A. M. Denis Bacelar, G. Farrelly,S. J. Steer,A. M. Bruce,P. Boutachkov,C. Domingo-Pardo, A. Algora,J. Benlliure, A. Bracco,E. Calore, E. Casarejos, I. J. Cullen, P. Detistov,Zs. Dombradi, M. Doncel, F. Farinon,W. Gelletly,H. Geissel,N. Goel, J. Grebosz, R. Hoischen, I. Kojouharov,N. Kurz, S. Lalkovski,S. Leoni,F. Molina,D. Montanari,A. I. Morales,A. Musumarra,D. R. Napoli, R. Nicolini,C. Nociforo,A. Prochazka,W. Prokopowicz,B. Rubio,D. Rudolph, H. Schaffner,P. Strmen,I. Szarka, T. Swan,J. S. Thomas,J. J. Valiente-Dobon,S. Verma,P. M. Walker,H. Weick

Physical Review C（2009）

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摘要

The nuclear structure of neutron-rich N>126 nuclei has been investigated following their production via relativistic projectile fragmentation of a E/A=1 GeV U-238 beam. Metastable states in the N=128 isotones Hg-208 and Tl-209 have been identified. Delayed gamma-ray transitions are interpreted as arising from the decay of I-pi=(8(+)) and (17/2(+)) isomers, respectively. The data allow for the so far most comprehensive verification of the shell-model approach in the region determined by magic numbers Z < 82 and N>126.

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关键词

gamma ray spectroscopy,gamma ray,metastable state,nuclear structure

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