Lifetimes of excited states in octupole-collective Ba-142,Ba-144 nuclei

D C Biswas, A G Smith, R M Wall, D Patel, G S Simpson, D M Cullen, J L Durell, S J Freeman, J C Lisle, J F Smith, B J Varley, T Yousef, G Barreau, M Petit, C Theisen, E Bouchez, M Houry, R Lucas, B Cahan, A Le CoguieB J P Gall, O Dorvaux, N Schulz

    Research output: Contribution to journalArticlepeer-review

    Abstract

    Lifetimes of excited states have been measured for the positive-parity rotational bands in neutron-rich Ba-142,Ba-144 as well as the 7(-) and 9(-) states of the negative-parity band in Ba-144 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(-) and 9(-) 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 Ba-144.
    Original languageEnglish
    Number of pages5
    JournalPhysical Review C
    Volume71
    Issue number1
    Publication statusPublished - 2005

    Keywords

    • NEUTRON-RICH
    • BARIUM ISOTOPES
    • SHAPE CHANGES
    • HIGH SPINS
    • DEFORMATION
    • E1
    • VIBRATION
    • RATES

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