Isomeric decay spectroscopy of the 217Bi isotope

A Gottardo,J J Valientedobon,G Benzoni,S Lunardi,A Gadea,A Algora,N Aldahan,G De Angelis,Y Ayyad,D Bazzacco,J Benlliure,P Boutachkov,M Bowry, A Bracco,A M Bruce,M Bunce,F Camera, E Casarejos, M L Cortes,F C L Crespi,A Corsi,A M Denis Bacelar,A Y Deo,C Domingopardo, M Doncel, T Engert, K Eppinger, G F Farrelly, F Farinon,E Farnea,H Geissel, J Gerl,N Goel, M Gorska, J Grebosz,E Gregor,Thomas M Habermann, R Hoischen, R Janik,P R John,S Klupp, I Kojouharov,N Kurz, S M Lenzi,S Leoni,S Mandal,R Menegazzo,D Mengoni, B Million,V Modamio

Physical Review C（2014）

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摘要

The structure of the neutron-rich bismuth isotope 217Bi has been studied for the first time. The fragmentation of a primary 238U beam at the FRS-RISING setup at GSI was exploited to perform γ-decay spectroscopy, since μs isomeric states were expected in this nucleus. Gamma rays following the decay of a t1/2=3 μs isomer were observed, allowing one to establish the low-lying structure of 217Bi. The level energies and the reduced electric quadrupole transition probability B(E2) from the isomeric state are compared to large-scale shell-model calculations.

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