Lifetimes of excited states in octupole-collective<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mmultiscripts><mml:mi mathvariant="normal">Ba</mml:mi><mml:mprescripts/><mml:none/><mml:mrow><mml:mn>142</mml:mn><mml:mo>,</mml:mo><mml:mn>144</mml:mn></mml:mrow></mml:mmultiscripts></mml:math>nuclei
D. C. BiswasDepartment of Physics and Astronomy, University of Manchester, Manchester, M13 9PL, UKA. G. SmithDepartment of Physics and Astronomy, University of Manchester, Manchester, M13 9PL, UKR. WallDepartment of Physics and Astronomy, University of Manchester, Manchester, M13 9PL, UKD. PatelDepartment of Physics and Astronomy, University of Manchester, Manchester, M13 9PL, UKG. S. SimpsonDepartment of Physics and Astronomy, University of Manchester, Manchester, M13 9PL, UKD. M. CullenNuclear PhysicsJ. L. DurellDepartment of Physics and Astronomy, University of Manchester, Manchester, M13 9PL, UKS. J. FreemanDepartment of Physics and Astronomy, University of Manchester, Manchester, M13 9PL, UKJ.C. LisleDepartment of Physics and Astronomy, University of Manchester, Manchester, M13 9PL, UKJ. F. SmithDepartment of Physics and Astronomy, University of Manchester, Manchester, M13 9PL, UKB. J. VarleyDepartment of Physics and Astronomy, University of Manchester, Manchester, M13 9PL, UKT. YousefDepartment of Physics and Astronomy, University of Manchester, Manchester, M13 9PL, UKG. BarreauCentre d'Études Nucléaires de Bordeaux-Gradignan (CENBG), F-33175 Gradignan Cedex, FranceMickaël PetitCentre d'Études Nucléaires de Bordeaux-Gradignan (CENBG), F-33175 Gradignan Cedex, FranceCh. TheisenCEA/Saclay, F-91191 Gif-sur-Yvette Cedex, FranceE. BouchezCEA/Saclay, F-91191 Gif-sur-Yvette Cedex, FranceM. HouryCEA/Saclay, F-91191 Gif-sur-Yvette Cedex, FranceR. LucasCEA Paris-SaclayB. D. CahanCEA/Saclay, F-91191 Gif-sur-Yvette Cedex, FranceA. Le CoguieCEA Paris-SaclayB. J. P. GallInstitut National de Physique Nucléaire et de Physique des ParticulesO. DorvauxInstitut de Recherches Subatomiques, CNRS-IN2P3, Université Louis Pasteur, F-67037 Strasbourg, FranceN. SchulzInstitut National de Physique Nucléaire et de Physique des Particules
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Lifetimes of excited states have been measured for the positive-parity rotational bands in neutron-rich $^{142,144}\mathrm{Ba}$ as well as the ${7}^{\ensuremath{-}}$ and ${9}^{\ensuremath{-}}$ states of the negative-parity band in $^{144}\mathrm{Ba}$ using the differential Doppler shift method. The deduced quadrupole moment, ${Q}_{t}$, of the positive-parity band decreases with angular momentum and overall shows good agreement with earlier measurements. The measured lifetimes of ${7}^{\ensuremath{-}}$ and ${9}^{\ensuremath{-}}$ states are used to determine the electric dipole moment, ${D}_{0}=0.17(3)$ and 0.09(1) e fm, respectively, in the negative-parity octupole band of $^{144}\mathrm{Ba}$.
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