Dipole strength distributions in the stable Ba isotopesBa134–138: A study in the mass region of a nuclear shape transition

Experiments on multiphonon states with proton–neutron mixed symmetry in vibrational nuclei

“…These lifetimes result, in combination with the γ -ray decay branching ratios I γ (2 + → 2 + 1 )/I γ (2 + → 0 + 1 ) = 4.785(3) and 2.51 (8), as well as the multipole mixing ratios δ = −0.31(5) and 0.02 (5) [137,138]. A pronounced concentration of M1 excitation strength has been observed close to 3 MeV.…”

“…The one-phonon 2 + 1,ms state of 138 Ce has very recently been studied by Rainovski et al [94] using the method of projectile Coulomb excitation at the Argonne National Laboratory, Argonne, IL.…”

“…The full set of signatures for the one-Q-phonon MSS has been obtained in Ref. [94] from one-step projectile Coulomb excitation of 138 Ce ions on a carbon target. Gamma rays have been observed with the Gammasphere Ge detector array at ANL, consisting of 98 HPGe detectors surrounding the target in rings at 17 different polar angles relative to the beam axis.…”

“…A beam of 138 Ce ions was delivered by the ATLAS accelerator with an intensity of about 1 particle nA. It has been extracted from the ATLAS-ECR ion source loaded with cerium material moderately enriched in the isotope 138 Ce which has only a low natural abundance of 0.25%.…”

Nuclear resonance fluorescence for materials assay

“…The NRF spectrum of 137 Cs has not been measured, however the NRF response of its daughter, 137 Ba has been measured [15] and NRF-based analysis for 137 Ba alone can provide significant information for age-dating. The 137 Xe β-decay has been studied and several excited states of 137 Cs between 3.5 and 4 MeV that decay directly to the ground state have been reported [8].…”