Speaker
Mr
Khanyisa Sowazi
(University of the Western Cape)
Description
An increasing number of experiments reveal the presence of a low-energy enhancement in the gamma-ray strength function (GSF). The GSF, which is the ability of nuclei to absorb and emit &gamma rays, provides insight into the statistical properties of atomic nuclei. For this project the GSF was studied for 74Ge which was populated in the reaction 74Ge(p,p’)74Ge at a beam energy of 18MeV. The data were collected with the STARS-LIBERACE array at Lawrence Berkeley National Laboratory. Silicon detector telescopes were used for particle identification and &gamma -rays in coincidence were detected with 5 Clover-type high-purity germanium detectors. Through the analysis particle- &gamma - &gamma coincidence events were constructed. These events, together with well-known energy levels, were used to identify primary &gamma rays from the quasicontinuum. Primary &gamma-rays from a broad excitation energy region, which decay to two 0+ states, six 2+ states, two 3+ states, five 3- states, and four 4+ states, could be identified. These states and the associated primary &gamma -rays are used to measure the GSF for 74Ge with the Ratio Method [1], which entails taking ratios of efficiency corrected primary &gamma-ray intensities from the quasicontinuum. I will discuss the results from the analysis of the data from the above reaction and focus on the existence of the low-energy enhancement in 74Ge. The results are further discussed in the context of other work done in 74Ge using the (&gamma,&gamma’) [2], (3He,3He’) [3] and (&alpha,&alpha’) [4] reactions.
[1] M. Wiedeking et al., Physical Review Letters 108, 162503 (2012)
[2] R. Massarczyk et al., Physical Review C 92, 044309 (2015)
[3] T. Renstrøm et al., Physical Review C 93, 064302 (2016)
[4] D. Negi et al., Physical Review C 94, 024332 (2016)
Apply to be<br> considered for a student <br> award (Yes / No)?
Yes
Main supervisor (name and email)<br>and his / her institution
Dr Mathis Wiedeking
wiedeking@tlabs.ac.za
iThemba LABS
Level for award<br> (Hons, MSc, <br> PhD, N/A)?
MSc
Would you like to <br> submit a short paper <br> for the Conference <br> Proceedings (Yes / No)?
Yes
Primary authors
Mr
Khanyisa Sowazi
(University of the Western Cape)
Dr
Mathis Wiedeking
(iThemba LABS)
Co-authors
Dr
Aaron Hurst
(Nuclear Science Division, Lawrence Berkeley National Laboratory)
Dr
Andreas Gorgen
(Department of Physics, University of Oslo)
Dr
Bethany Goldblum
(Department of Nuclear Engineering, University of California)
Dr
Bongani Kheswa
(Department of Physics, University of Oslo)
Dr
Darren Bleuel
(Physical and Life Sciences Directorate, Lawrence Livermore National Laboratory)
Dr
Jason Burke
(Physical and Life Sciences Directorate, Lawrence Livermore National Laboratory,)
Dr
Jo Ressler
(Physical and Life Sciences Directorate, Lawrence Livermore National Laboratory)
Dr
John Koglin
(Physical and Life Sciences Directorate, Lawrence Livermore National Laboratory)
Dr
Lee Bernstein
(Nuclear Science Division, Lawrence Berkeley National Laboratory)
Dr
Lily Crabtree
(Department of Nuclear Engineering, University of Tennessee)
Dr
Maria Petri
(Nuclear Science Division, Lawrence Berkeley National Laboratory)
Dr
Nick Scielzo
(Physical and Life Sciences Directorate, Lawrence Livermore National Laboratory)
Dr
Nico Orce
(University of the Western Cape)
Dr
Paul Papka
(Stellenbosch University)
Dr
Robert Hatarik
(Physical and Life Sciences Directorate, Lawrence Livermore National Laboratory)
Dr
Stefanos Paschalis
(Nuclear Science Division, Lawrence Berkeley National Laboratory)
Dr
Sunniva Siem
(Department of Physics, University of Oslo)
Dr
Tim Reed
(Department of Nuclear Engineering, University of Tennessee)
