Mass database

Author: C. Weber et al. 
Title: Weighing excited nuclear states with a Penning trap mass spectrometer 
Year: 2005 
Link: http://dx.doi.org/10.1016/j.physleta.2005.06.108

isotope frequency ratio ref. ion ME Isoltrap
(in keV)
ME AME 2003
(in keV)
comment
Pb-187m 1.406896071(41) Cs-133  no value(no value) -14969(11)  
Pb-187 1.406895934(32) Cs-133  no value(no value) -14980(8)