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Kent Leung

Research Assistant Professor

Riddick Hall 160 H

919 442 8283

https://exnuc.wordpress.ncsu.edu/

Bio

PhD: Technical University of Munich, Germany (#16 QS World University Ranking, Physics & Astronomy)
with research fellowship at Institut Laue-Langevin, France

BS and MS: University of Auckland, New Zealand (#83 in QS World University Ranking)

Research Description

Dr. Kent Leung's research interests lie in the areas of Fundamental Symmetries and Beyond Standard Model searches using low-energy, high-precision nuclear and particle physics experiments. These experiments allow us to address profound questions such as: Are there new forces or particles out there that we haven't discovered yet? What are the fundamental symmetries of our physical laws? Why do some laws appear to have symmetries extremely fine-tuned? Is the Standard Model complete? Why was there more matter than anti-matter remaining after the Big Bang? How did nuclei form during the Big Bang?       In Auckland, working under the supervision of Prof. Paul Barker, high-precision half-life measurements of positron-emitting Carbon-10, the lightest of the super-allowed 0+ to 0+ beta decay transitions, were performed in collaboration with Prof. Aidan Byrne at the 14 UD tandem pelletron accelerator, Australian National University, Canberra. Subsequently, Kent's research focus shifted to ultra-cold neutrons (UCNs), free neutrons produced from nuclear fission or spallation that are cooled down to E < 300neV and v < 7m/s (or T < 2mK). At the ILL, a pan-European 50MW scientific reactor facility, research under the guidance of Prof. Oliver Zimmer was performed on the production of UCNs in superfluid helium and magnetic trapping of UCNs for high-precision measurements of the neutron lifetime. At NCSU, Dr. Leung works with Drs. Huffman, Golub and Young to use ultracold neutrons in fundamental tests of physics, such as searches for the permanent electric dipole moment of the neutron.     Some links that may be of further interest:

Publications

Complete list of publications

CV

View CV

Selected Publications

Compton scattering from 4He at the TUNL HIγS facility
X. Li, M.W. Ahmed, A. Banu, C. Bartram, B. Crowe, E.J. Downie, M. Emamian, G. Feldman, H. Gao, D. Godagama, H.W. Grießhammer, C.R. Howell, H.J. Karwowski, D.P. Kendellen, M.A. Kovash, K.K.H. Leung, D. Markoff, S. Mikhailov, R.E. Pywell, M.H. Sikora, J.A. Silano, R.S. Sosa, M.C. Spraker, G. Swift, P. Wallace, H.R. Weller, C.S. Whisnant, Y.K. Wu, and Z.W. Zhao
Physical Review C, 101, (2020), 034618, doi:10.1103/PhysRevC.101.034618

A next-generation inverse-geometry spallation-driven ultracold neutron source
K.K.H. Leung, G. Muhrer, T. Hügle, T.M. Ito, E.M. Lutz, M. Makela, C.L. Morris, R.W. Pattie Jr., A. Saunders, A.R. Young
Journal of Applied Physics (Editor's Pick), 126, (2019), 224901, doi:10.1063/1.5109879

The neutron electric dipole moment experiment at the Spallation Neutron Source
K.K.H. Leung, M. Ahmed, R. Alarcon, A. Aleksandrova, […] R. Golub, C.R. Gould, […] D.G. Haase, […] A.I. Hawari, […] P.R. Huffman, […] E. Korobkina, […] A.R. Young
European Physical Journal Web of Conferences, 219, (2019), 02005, doi:10.1051/epjconf/201921902005

A new cryogenic apparatus to search for the neutron electric dipole moment
M. W. Ahmed, R. Alarcon, A. Aleksandrova,[…] B. W. Filippone (Corresponding author),[…] R. Golub, C. R. Gould,[…] D. G. Haase,[…] P. R. Huffman,[…] E. Korobkina,[…] K. K. H. Leung,[…] A.R. Young
Journal of Instrumentation, 14(11), (2019), 11017, doi:10.1088/1748-0221/14/11/p11017

Solid deuterium surface degradation at ultracold neutron sources
A. Anghel, T. L. Bailey, G. Bison,[…] P. Huffman,[…] E. Korobkina,[…] K. Leung,[…] A. R. Young, […]
The European Physical Journal A (Highlights), 54 (9), (2018), 148, doi:10.1140/epja/i2018-12594-2

Spin flip loss in magnetic confinement of ultracold neutrons for neutron lifetime experiments
A. Steyerl, K.K.H. Leung, C. Kaufman, G. Müller, and S.S. Malik
Physical Review C, 95, (2017), 035502, doi:10.1103/PhysRevC.95.035502

Neutron lifetime measurements and effective spectral cleaning with an ultracold neutron trap using a vertical halbach octupole permanent magnet array
K. K. H. Leung, P. Geltenbort, S. Ivanov, F. Rosenau, and O. Zimmer.
Physical Review C, 94, (2016), 045502, doi:10.1103/PhysRevC.94.045502

Position-sensitive detection of ultracold neutrons with an imaging camera and its implications to spectroscopy
W. Wei, L. J. Broussard, M. A. Hoffbauer, M. Makela, C. L. Morris, Z. Tang [...] K. K. Leung [...] and Zhehui Wang.
Nuclear Instruments and Methods in Physics Research Section A, 830, (2016), 36, doi:10.1016/j.nima.2016.05.058

Ultracold-neutron production and up-scattering in superfluid helium between 1.1 K and 2.4 K
K. K. H. Leung, S. Ivanov, F. M. Piegsa, M. Simson, and O. Zimmer
Physical Review C, 93, (2016), 025501, doi:10.1103/PhysRevC.93.025501

Experimental study of ultracold neutron production in pressurized superfluid helium
P. Schmidt-Wellenburg, J. Bossy, E. Farhi, M. Fertl, K. K. H. Leung, A. Rahli, T. Soldner, and O. Zimmer.
Physical Review C, 92, (2015), 024004, doi:10.1103/PhysRevC.92.024004

New source for ultracold neutrons at the Institut Laue-Langevin
F. M. Piegsa, M. Fertl, S. N. Ivanov, M. Kreuz, K. K. H. Leung, P. Schmidt-Wellenburg, T. Soldner, and O. Zimmer.
Physical Review C, 90, (2014), 015501, doi:10.1103/PhysRevC.90.015501

A comparison of two magnetic ultra-cold neutron trapping concepts using a Halbach-octupole array
K. Leung, S. Ivanov, F. Martin, F. Rosenau, M. Simson, and O. Zimmer
Next Generation Experiments to Measure the Neutron Lifetime, (2014), 145, doi:10.1142/9789814571678_0015

Proposed neutron lifetime measurement using a hybrid magnetic trap for ultra-cold neutrons
K. K. H. Leung and O. Zimmer
Nuclear Instruments and Methods in Physics Research Section A, 611(2-3), (2009), 181, doi:10.1016/j.nima.2009.07.087

Half-life of the superallowed positron emitter 10C
P. H. Barker, K. K. H. Leung, and A. P. Byrne
Physical Review C, 79, (2009), 024311, doi:10.1103/PhysRevC.79.024311

Measuring the proton spectrum in neutron decay - latest results with aSPECT
M. Simson, F. Ayala Guardia, S. Baessler, M. Borg, F. Gluck, W. Heil, I. Konorov, G. Konrad, R. Munoz Horta, K. K. H. Leung, Yu. Sobolev, T. Soldner, H.-F. Wirth.
Nuclear Instruments and Methods in Physics Research Section A, 611, (2009), 203, doi:10.1016/j.nima.2009.07.068