Abstract
High-spin levels in Ba isotopes are observed in the reactions 122,124Sn( 12C,3nγ) 131,133Ba and 124Sn( 12C,4nγ) 132Ba. They are studied by in-beam spectroscopic methods such as prompt and delayed spectra, excitation functions, γ-γ coincidences and angular distributions. Bands are found on the 11 − 2 isometric state in 133Ba and on the 9 − 2 isomeric state in 131Ba which are in agreement with the structure of other nuclei with 77 and 75 neutrons and with prolate deformation. A negative-parity band with both even- and odd-spin members from 5 − to 9 − is found in 132Ba.
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