Refilwe Emil Molaeng
(University of the Witwatersrand and iThemba LABS)
This study aims to investigate the Pygmy Dipole Resonance (PDR) in the deformed 154Sm nucleus. The present study employs the ( γ , γ ′) reaction to examine dipole states in the energy range 3.5 MeV to 7.05 MeV (close to the neutron separation threshold (8 MeV)). The experiment was carried out using the Clover Array at the HIγS facility of the Triangle Universities Nuclear Laboratory. The polarised beam produced at the facility enables measurements through the asymmetry method to characterize the nature of populated transitions, allowing differentiation between 1- and 1+ states, an essential aspect in the study of the dipole response of nuclei. Furthermore, the high-resolution beam mode (< 2%) available at HIγS makes the determination of the decay branching ratio to the first 2+ state possible. This will aid in identifying the K quantum number of various excited states and in analyzing the PDR as a function of excitation energy. The validity of the Alaga rules in the region of the PDR will also be investigated in this work. The motivation behind this study, along with experimental details, will be presented. Preliminary data analysis will be discussed and an outlook on future comparisons will be provided.
This work is based on the research supported in part by the National Research Foundation of South Africa (Grants No. MND210503598725, No. REP_SARC180529336567) and the US Department of Energy (Grants No. DE-FG02-97ER41041 (UNC), No. DE-FG02-97ER41033 (TUNL)).
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Refilwe Emil Molaeng
(University of the Witwatersrand and iThemba LABS)
Akaa Daniel Ayangeakaa
(University of North Carolina and Triangle Universities Nuclear Laboratory)
Amrita Gupta
(Technische Universität Darmstadt)
Antonella Saracino
(University of North Carolina and Triangle Universities Nuclear Laboratory)
Bastian Löher
(GSI Helmholtzzentrum für Schwerionenforschung GmbH)
Benjamin Wellons
(Texas A&M University)
David Gribble
(University of North Carolina and Triangle Universities Nuclear Laboratory)
Deniz Savran
(GSI Helmholtzzentrum für Schwerionenforschung GmbH)
Iyabo Usman
(School of Physics, University of Witwatersrand, Johannesburg, South Africa)
Johann Isaak
(Technische Universität Darmstadt)
John Santucci
(Texas A&M University)
Jörn Kleemann
(Technische Universität Darmstadt)
Kiriaki Prifti
(Technische Universität Darmstadt)
Lindsay Donaldson
(iThemba LABS, Old Faure Rd, Eerste River, 7100, South Africa)
Luna Pellegri
(University of the Witwatersrand and iThemba LABS)
Norbert Pietralla
(Technische Universität Darmstadt)
Oliver Papst
(Technische Universität Darmstadt)
Philip Adsley
(Department of Physics and Astronomy, Texas A&M University, College Station, Texas, USA)
Robert Janssens
(University of North Carolina and Triangle Universities Nuclear Laboratory)
Samantha Johnson
(University of North Carolina and Triangle Universities Nuclear Laboratory)
Sean Finch
(Duke University and Triangle Universities Nuclear Laboratory)
Tyler Kowalewski
(University of North Carolina and Triangle Universities Nuclear Laboratory)
Xavier James
(University of North Carolina and Triangle Universities Nuclear Laboratory)
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