New Isomers in the Full Seniority Scheme of Neutron-Rich Lead Isotopes: The Role of Effective Three-Body Forces

A Gottardo,J J Valiente-Dobón,A Gadea,W Prokopowicz,A M Denis Bacelar,R V Ribas,E Casarejos,A Bracco,F Naqvi,M Bunce,Y Ayyad,E Gregor,A M Bruce,D Bazzacco,F C L Crespi,S M Lenzi,P Boutachkov,T Engert,G De Angelis,R Janik,M W Reed,S Leoni,E Farnea,F Camera,F Recchia,N Goel,C A Ur,F Nowacki,J Alcántara Núñez,N Kurz,R Nicolini,A Sharma,T Habermann,M Bowry,J Benlliure,I Szarka,P M Walker,I Kojouharov,C Nociforo,M Pfützner,D R Napoli,H Weick,A Y Deo,R Menegazzo,N Alkhomashi,Zs Podolyák,A Algora,E Maglione,F Farinon,D Mengoni,A I Morales,S Klupp,H Schaffner,S Lunardi,M Doncel,J Gerl,G Benzoni,O Wieland,G F Farrelly,A Corsi,A P Zuker,B Million,S Mandal,K Eppinger,M Górska,R Hoischen,T Swan ,C Domingo‐Pardo ,Katja Steiger ,E Šahin ,H Geißel ,A Procházka ,P.r.p Allegro ,P.h Regan ,B Sitár ,M L Cortés ,N Al‐Dahan ,Davinder Siwal ,Dirk Rudolph ,H J Wollersheim ,S Piétri ,Zs Dombrádi ,J Grębosz ,P Strmeň

doi:10.1103/physrevlett.109.162502

Abstract

The neutron-rich lead isotopes, up to (216)Pb, have been studied for the first time, exploiting the fragmentation of a primary uranium beam at the FRS-RISING setup at GSI. The observed isomeric states exhibit electromagnetic transition strengths which deviate from state-of-the-art shell-model calculations. It is shown that their complete description demands the introduction of effective three-body interactions and two-body transition operators in the conventional neutron valence space beyond (208)Pb.

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