Isomer-tagged differential-plunger measurements in proton-unbound 144Ho

P. J R Mason, D. M. Cullen, C. Scholey, A. Dewald, O. Möller, H. Iwasaki, T. Pissulla, W. Rother, J. A. Dare, P. T. Greenlees, U. Jakobsson, P. M. Jones, R. Julin, S. Juutinen, S. Ketelhut, M. Leino, N. M. Lumley, B. Niclasen, M. Nyman, P. PeuraA. Puurunen, P. Rahkila, P. Ruotsalainen, J. Sorri, J. Sarén, J. Uusitalo, F. R. Xu

    Research output: Contribution to journalArticlepeer-review


    The lifetime of an excited state above a weakly populated isomer in the proton-unbound odd-odd nucleus 144Ho has been measured using the recoil distance Doppler shift method. This measurement represents the first differential-plunger lifetime measurement to utilize recoil-isomer tagging. The first excited Iπ = (10+) state above the two-quasiparticle π h11 / 2 ⊗ ν h11 / 2 (8+) isomer was determined to have a lifetime of τ = 6 (1) ps. Potential energy surface calculations, based on the configuration-constrained blocking method, predict the isomeric state to have γ-soft triaxial-nuclear shape with | γ | ≈ 24 °. The lifetime of the (10+) state can be understood from these calculations if there is a degree of rotational alignment in this band, with the K value being lower than the bandhead spin. However, the validity of the K quantum number with large predicted triaxiality and gamma softness requires further theoretical study. © 2009 Elsevier B.V. All rights reserved.
    Original languageEnglish
    Pages (from-to)17-20
    Number of pages3
    JournalPhysics Letters. Section B: Nuclear, Elementary Particle and High-Energy Physics
    Issue number1
    Publication statusPublished - 11 Jan 2010


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