Measurements of g-factors of excited states in Ba and Ce nuclei using gamma rays from secondary fission fragments

AG Smith, GS Simpson, J Billowes, JL Durell, PJ Dagnall, SJ Freeman, M Leddy, AA Roach, JF Smith, A Jungclaus, KP Lieb, C Teich, BJP Gall, F Hoellinger, N Schulz, I Ahmad, J Greene, A Algora

    Research output: Contribution to journalArticlepeer-review

    Abstract

    Measurements of g-factors of excited states in barium and cerium fission fragments have been performed using time-integral perturbed angular correlations between secondary-fragment gamma rays. Larmor precession angles have been obtained for the first I-pi = 2(+) states in Ba-144,Ba-146 and Ce-146,Ce-148 as well as for the 9/2(-) state at 117 keV in Ba-143, the 7/2(-) state at 114 keV in Ba-145 and the first 4(+) state in Ce-150. The deduced g-factor fur the 2(+) state in Ba-146 provides substantiating evidence for a downward trend in 2(+) g-factors with increasing neutron number, in line with Interacting Boson Model predictions for the neutron-rich barium isotopes, assuming the quenching of the Z = 64 shell gap for N>88. The static hyperfine fields for implanted barium and cerium isotopes are found to be opposite in sign. These results constitute the first use of secondary-fragment gamma-ray emission in the determination of g-factors of excited states in fission fragments. (C) 1999 Elsevier Science B.V. All rights reserved.
    Original languageEnglish
    Pages (from-to)206-210
    JournalPhysics Letters B
    Volume453
    Issue number3-4
    Publication statusPublished - 6 May 1999

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