Statistical gamma-ray decay studies at iThemba LABS

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Date
2017Author
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
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Show full item recordAbstract
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