Bulletin of the American Physical Society
New England Section Fall 2022 Meeting
Volume 67, Number 13
Friday–Saturday, October 14–15, 2022; University of New Hampshire, Durham, NH
Session G02: Parallel Invited Session - Nuclear Physics II |
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Chair: David Ruth Room: University of New Hampshire in Durham DeMeritt Hall 240 |
Saturday, October 15, 2022 8:30AM - 9:06AM |
G02.00001: Jefferson Lab's Detector Development for Bio-Medical Research Applications Invited Speaker: Andrew Weisenberger Thomas Jefferson National Accelerator Facility (Jefferson Lab) is one of the Department of Energy's federally funded research and development centers. Physicists from around the globe utilize Jefferson Lab's unique particle accelerator, known as the Continuous Electron Beam Accelerator Facility, to probe the building blocks of matter at the quark-gluon scale. In addition, the lab capitalizes on its unique technologies and expertise to explore ways of applying nuclear physics principles and technologies to societal needs. The Radiation Detector and Imaging Group has for several years been directing advances in nuclear physics detector technology to applications outside of nuclear physic research. I will discuss radioisotope based molecular imaging modalities and elaborate on how the group has leveraged nuclear physics to bring advances to nuclear medicine imaging, medical research and plant biology research. Examples include a novel detector system developed to improve breast cancer detection, a surgical imaging tool to aide cancer surgery, and an imaging technology that allows researchers to dynamically image the products of plant photosynthesis. |
Saturday, October 15, 2022 9:06AM - 9:42AM |
G02.00002: Instrumentation for High- and Low-Field/High-Frequency DNP/EPR Spectroscopy Invited Speaker: Thorsten Maly Dynamic Nuclear Polarization (DNP) is a technique in which the large thermal electron polarization is transferred to the nuclear spin reservoir by saturation of an allowed or forbidden Electron Paramagnetic Resonance (EPR) transition. The technique can provide a sensitivity boost in some cases close to the theoretical maximum of 660 (for 1H). In recent years, DNP has proven to be a robust method to increase signal intensities in NMR experiments in laboratories around the world The efficiency of the DNP process in solids or solutions depends on many different factors such as the strength of the magnetic field at which the experiment is performed, the strength of the microwave induced magnetic field (w1e), or the electron T1e and T2e relaxation times. Furthermore, in the case of solid-state DNP spectroscopy, the strength of the electron dipolar coupling in a biradical and the breadth of the EPR spectrum (D) are important factors to know to understand the type of DNP mechanism and to optimize its performance. It is therefore crucial to understand the EPR spectrum and relaxation properties of the polarizing agent at the same magnetic field at which the DNP experiment is performed. Low-field DNP spectroscopy, in particular Overhauser DNP spectroscopy is a powerful tool to study hydration dynamics at liquid/solid interfaces. Here, the instrumentation requirements are less demanding and microwave cavities with integrated RF coils are commonly employed. High-field DNP spectroscopy, on the other hand, presents many different challenges. Due to their microscopic sizes, cavities are less frequently used. In addition, the maximum available microwave/THz power is severely limited, and many low-frequency discreet microwave components do not have an equivalent at high frequencies and quasi-optical methods must be used. |
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