Positive- and negative-parity yrast bands in the transitional nucleide 150Sm and the interacting boson approximation

Z. Sujkowski, D. Chmielewska, M. J. A. de Voigt, J. F. W. Jansen, O. Scholten

    OnderzoeksoutputAcademicpeer review

    25 Citaten (Scopus)


    The 150Nd(α, 4n) reaction at Eα = 45 MeV has been used to study high spin states in the 15062Sm 88 nucleide. The experiments comprised measurements of singles γ-ray and conversion electron spectra, γ-ray angular distributions, three-parameter ( Eα- Eα- t) coincidences and a γ-ray anti-Compton spectrum. Predominantly populated were the ground-state band (g.s.b.) extending to Jπ = 12 + and tentatively to 16 + and a negative-parity odd spin band (n.p.b.) extending from Jπ = 5 - through 15 - and tentatively to 19 -. The bands are interpreted in the framework of the interacting boson approximation model with a Hamiltonian appropriate for a transitional nucleus, far away from either the rotational or vibrational limit. It is found that the model gives a very satisfactory description of the energies of the two bands observed as well as of the branching ratios of the intra- and inter-band transitions. The gentle backbending of the {2ℷ}/{h̷}2 versus (ħω) 2 curve for g.s.b. above Jπ = 10 + is reproduced in the calculation without making use of the band-crossing concept. The absolute reaction cross sections have been determined at 45 MeV bombarding energy to be σtot = 1380 ± 170 mb and σ4n = 800 ± 100 mb.
    Originele taal-2English
    Pagina's (van-tot)365-385
    TijdschriftNuclear Physics A
    StatusPublished - 1-nov.-1977

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