Dr. Xu received his Ph.D. from the University of California, Los Angeles, studying
heavy flavor quarks in heavy ion collisions created at the Brookhaven National Lab
and measuring the theta13 neutrino mixing angle with the Daya Bay Reactor Neutrino
Experiment. He worked at the Los Alamos National Lab and the University of North Carolina-Chapel
Hill, focusing on understanding the properties of neutrinos. He joined USD in 2016.
Nuclear and Particle Physics, Introductory Physics and Astronomy, Statistics in Physics
I am intrigued by fundamental particles and interactions that could explain how the
Universe works. My research broadly incorporate Neutrinos and Fundamental Symmetries,
Dark Matter and Axions, Physics Beyond the Standard Model, Hadronic Physics and Detector
In particular, neutrinos were thought to have zero mass for a long time. The discovery
of neutrino oscillations and the consequent non-zero neutrino masses provided a direct
and unambiguous evidence of physics beyond the Standard Model. Yet, the origin of
neutrino masses remains a mystery and is considered as one of the most compelling
questions in physics. The answer to this question is related to the particle-antiparticle
nature of neutrinos and could hold a key to why there is much more matter than antimatter
in the Universe and why we exist.
My current focus is the MAJORANA DEMONSTRATOR experiment, which is located in South
Dakota (4850' below underground at the Sanford Underground Research Facility. sanfordlab.org).
This experiment is part of a global effort to understand the properties of neutrinos
and, in particular, it utilizes High Purity Germanium (HPGe) detectors to search for
neutrinoless double beta decay and other new physics, including dark matter and axions.
Citations listed below are presented in a standardized, modified format for
display purposes only. They do not necessarily reflect the preferred style and conventions
of the faculty member or discipline.
- Majorana Collaboration, and Xu, Wenqin. First Limit on the Direct Detection of Lightly Ionizing Particles for Electric Charge
as Low as e/1000 with the Majorana Demonstrator, 211804. Vol. 120. Physical Review Letters, 2018. (DOI: 10.1103/PhysRevLett.120.211804)
- Majorana Collaboration, and Xu, Wenqin. Search for Neutrinoless Double Beta Decay in 76Ge with the Majorana Demonstrator, 132502. Vol. 120. Physical Review Letters, 2018. (DOI: 10.1103/PhysRevLett.120.132502)
- Majorana Collaboration, and Xu, Wenqin. The Processing of Enriched Germanium for the MAJORANA DEMONSTRATOR and R&D for a Next
Generation Double-Beta Decay Experiment, 314. Vol. 877. Nuclear Inst. and Methods in Physics Research, A, 2018. (DOI: 10.1016/j.nima.2017.09.036)
- Majorana Collaboration, and Xu, Wenqin. The Majorana Demonstrator calibration system, 16-22. Vol. 872. Nuclear Instruments and Methods in Physics Research Section A, 2017. (DOI: 10.1016/j.nima.2017.08.005)
- Massarczyk, R, Chu, P, Dugger, C, Rielage, K, Elliott, S R., and Xu, Wenqin. Paschen's law studies in cold gases. Vol. 12. Journal of Instrumentation, 2017. (DOI: 10.1088/1748-0221/12/06/P06019)
- Majorana Collaboration, and Xu, Wenqin. New limits on bosonic dark matter, solar axions, Pauli Exclusion Principle violation,
and electron decay from the Majorana Demonstrator, 161801. Vol. 118. Physical Review Letters, 2017. (DOI: 10.1103/PhysRevLett.118.161801)
- STAR Collaboration, and Xu, Wenqin. Elliptic flow of electrons from heavy-flavor hadron decays in Au + Au collisions at
SNN=200, 62.4, and 39 GeV, 034907. Vol. 95. PHYSICAL REVIEW C, 2017. (DOI: 10.1103/PhysRevC.95.034907)
- Majorana Collaboration, and Xu, Wenqin. Muon flux measurements at the davis campus of the sanford underground research facility
with the majorana demonstrator veto system, 70. Vol. 93. Astroparticle Physics, 2017. (DOI: 10.1016/j.astropartphys.2017.01.013)
- Xu, Wenqin, and Elliott, Steven R.. Solar Axion Search Technique with Correlated Signals from Multiple Detectors, 39-50. Vol. 89. Amsterdam: Astroparticle Physics, 2017. (DOI: 10.1016/j.astropartphys.2017.01.008)
- Majorana Collaboration, and Xu, Wenqin. Search for Pauli Exclusion Principle Violating Atomic Transitions and Electron Decay
with a P-type Point Contact Germanium Detector, 619. Vol. 76. The European Physical Journal C, 2016. (DOI: 10.1140/epjc/s10052-016-4467-0)