Andrew J. R. Puckett, Associate Professor, Department of Physics
Professor Puckett is an experimental nuclear/particle physicist studying the internal structure of strongly interacting matter in high-energy fixed-target electron-nucleon and electron-nucleus scattering experiments at Jefferson Lab (JLab). The recently completed 12 GeV upgrade of JLab's Continuous Electron Beam Accelerator Facility to a maximum beam energy of 11 GeV (12 GeV) for electron-beam (photon-beam) experiments, augmented by state-of-the-art target and detector systems, will enable a world-leading physics program leading to three-dimensional imaging of the internal quark structure of protons, neutrons and nuclei with unprecedented precision in both coordinate and momentum space. The ultimate goal of the experiments is to understand how strongly interacting matter is built from its elementary quark and gluon constituents in terms of Quantum Chromodynamics, the theory of the strong interaction. Click the image to see the list of publications and citations (according to Google Scholar)
The PRAD collaboration recently published their results on very low Q2 electron-proton scattering in Hall B at Jefferson Lab, extracting a proton charge radius of rp = 0.831 ± 0.007 (stat) ± 0.012 (syst) fm, consistent with the precise extraction of this quantity from measurements of the Lamb shift in muonic hydrogen, first published in […][Read More]
Professor Puckett is attending and presenting an invited talk at the workshop “Diquark Correlations in Hadron Physics” at the European Center for Theoretical Studies in Nuclear Physics and Related Areas (ECT*) in Trento, Italy, during the week of Sept. 23-27. The webpage and program of the workshop can be found at the following link.[Read More]
The first paper from the recently completed family of tritium target experiments in JLab’s Hall A is now published in Physics Letters B. The final published version of the paper can be found online at https://doi.org/10.1016/j.physletb.2019.134890 The INSPIRE-HEP database entry for the paper can be found at http://inspirehep.net/record/1720567 The paper reports the first measurement of […][Read More]
Physics Department Upcoming Events
Physics Colloquium (Prof. Reynold Silber)3:30pm
Friday, February 7th, 2020
03:30 PM - 04:30 PM
Storrs Campus BPB-131Prof. Reynold E. Silber, Department of Geology and Geophysics, Yale University
Transport properties of liquid transition metals at extreme conditions: a lesson from metallic glasses with the forbidden symmetry
The Earth’s core is a giant heat engine that supports the existence of life on our planet by providing heat to drive mantle convection, plate tectonics and volcanism. The convection of a liquid iron (Fe) alloy in the outer core generates the Earth’s magnetic field. However, transport properties of liquid Fe-alloys (e.g., electrical, thermal and viscous transport properties) at extreme core conditions are some of the least constrained parameters. The high pressure experimental measurements of the transport properties are extremely challenging and a general theoretical understanding of the structures of liquid transition metals is still incomplete. Recent successful electrical resistivity measurements of liquid Fe, Ni and Fe-Si alloy at pressures up to 24 GPa show the invariant electrical resistivity along the melting boundaries. It was demonstrated that the Icosahedral Short Range Order (ISRO) structures in liquid transition metals and alloys strongly modulate transport properties at extreme conditions. Supporting evidence for the presence of the ISRO in the Earth’s and other terrestrial outer cores comes from the recently discovered quasi-crystalline phases in natural metallic glasses with the forbidden symmetry, previously considered impossible to exist in nature. However, the existence of forbidden fivefold symmetry is not possible without super-cooling of metallic glass forming liquids that contain ISRO structures. Thus, metallic glasses represent one of the convergence points between planetary science and materials science. Here, I first discuss a new paradigm imposed by the ISRO structures on the transport properties of the outer cores of terrestrial planetary bodies. The discussion is then extended toward the important role ISROs play in formation of metallic glasses with exotic properties. Furthermore, I examine the potential application of high pressures toward manufacturing of metallic glasses with customizable concentration of structures with ISRO or any other forbidden symmetry. Considering the important role of metallic glasses in the high tech industry, this research has significant cross-disciplinary implications.
Contact Information: Prof. Vernon CormierMore
Particle, Astrophysics, and Nuclear Physics Seminar2:00pm
Monday, February 10th, 2020
02:00 PM - 03:00 PM
Storrs Campus GS-413EProf. Lorenzo Sorbo, Department of Physics, University of Massachusetts Amherst
Particle production during inflation: a case study
In this talk I will quickly review primordial inflation. After arguing that axion-like inflatons are especially well motivated, I will discuss how a derivative coupling of a pseudoscalar inflaton to vector and to fermions fields can amplify significantly the mode functions of those degrees of freedom which, in their turn, can lead to a very rich phenomenology.
Contact Information: Prof. L. JinMore
Physics Colloquium (Prof. Jason Hancock and Diego Valente)3:30pm
Friday, February 14th, 2020
03:30 PM - 04:30 PM
Storrs Campus Gant Plaza (tentative) or BPB-131Intro/overview on new studio-format classrooms.
Profs. Jason Hancock and Diego Valente. UConn.
Title and abstract: TBD
Contact Information: Prof. Jason HancockMore