Browsing by Author "S. Siem"

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    Statistical gamma-ray decay studies at iThemba LABS
    (EDP Sciences, 2017) M. Wiedeking; L.A. Bernstein; D.L. Bleuel; C.P. Brits; K. Sowazi; A. Gorgen; L. Goldblum; B.R. Zikhali; S. Siem; T. Nogwanya; M. Guttormsen; D. Negi
    Abstract. A program to study the γ -ray decay from the region of high-level density has been established at iThemba LABS, where a high-resolution gamma-ray detector array is used in conjunction with silicon particle-telescopes. Results from two recent projects are presented: 1) The 74Ge(α, α γ ) reaction was used to investigate the Pygmy Dipole Resonance. The results were compared to (γ,γ ) data and indicate that the dipole states split into mixed isospin and relatively pure isovector excitations. 2) Data from the 95Mo(d,p) reaction were used to develop a novel method for the determination of spins for low-lying discrete levels utilizing statistical γ -ray decay in the vicinity of the neutron separation energy. These results provide insight into the competition of (γ ,n) and (γ,γ ) reactions and highlights the need to correct for angular momentum barrier effects