Abstract
High-resolution laser spectroscopy has been performed on 118–145Cs and 119m, 121m, 122m, 130m, 134m, 135m, 136m, 138m,Cs.The Cs nuclei have been produced either by spallation of La or by fission of U by the 600 MeV proton beam, from the SC at CERN. The hyperfine structures, spins, and isotope shifts have been measured. The charge radii changes deduced from the isotope shifts exhibit shell effects at N = 82, isomeric staggering for N = 64,66,67 and a strong odd-even staggering for all isotopes with N < 82.
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