Bulletin of the American Physical Society
2021 Fall Meeting of the APS Division of Nuclear Physics
Volume 66, Number 8
Monday–Thursday, October 11–14, 2021; Virtual; Eastern Daylight Time
Session FJ: Instrumentation III |
Hide Abstracts |
Chair: Kondo Gnanvo, UVA Room: Tremont |
Tuesday, October 12, 2021 2:00PM - 2:12PM |
FJ.00001: Abstract Withdrawn
|
Tuesday, October 12, 2021 2:12PM - 2:24PM |
FJ.00002: Double Blinding Procedure for Muon g-2 Zepyoor Khechadoorian The Fermi National Accelerator Laboratory Muon g-2 Experiment measures the muon's anomalous magnetic moment aμ = (g-2)/2 in order to reassess its tension with the Standard Model based on the original result from Brookhaven National Laboratory. To protect final results from personal biases, we double-blind the key observable ωa (the anomalous precession frequency) in both hardware and software until the collaboration finalizes their results and unanimously agrees to unblind. We implement hardware-level blinding in the form of a offset to the primary 40-MHz clock which drives the experiment's calorimeters. During data collection, we monitor deviations in this primary clock from its nominal value to ensure its long-term stability whilst remaining unaware of its blinded set point. We add an additional layer of software-level blinding to prevent influence amongst the multiple analysis groups. Each analyzer picks a unique string which is hashed into a new offset value R that replaces ωa in their analysis. We applied this blinding procedure successfully to the earliest dataset and continue its application to all subsequent datasets. |
Tuesday, October 12, 2021 2:24PM - 2:36PM |
FJ.00003: Upgraded readout electronics for the Neutron dEtector with Xn Tracking (NEXT) array Noritaka Kitamura, Robert Grzywacz, Shree K Neupane, Joseph Heideman, Mustafa M Rajabali, Kate L Jones, Lawrence H Heilbronn, Joshua Hooker, Miguel Madurga, Kevin Siegl, Cory R Thornsberry, Philipp Wagenknecht, Zhengyu Xu The advent of the new generation of radioactive ion beam facilities will enable studies of very neutron-rich nuclei near the drip line. In these regions, beta-delayed neutron emission becomes a dominant decay channel, and neutron spectroscopy is a powerful tool to elucidate the nuclear structure. The Neutron dEtector with Xn Tracking (NEXT) array has been developed for more precise time-of-flight measurements of neutrons [1]. A single NEXT module is composed of thin plastic scintillator bars and position-sensitive photomultipliers, and this design enables the localization of neutron interaction points for better energy resolution. |
Tuesday, October 12, 2021 2:36PM - 2:48PM |
FJ.00004: Measuring fusion with low-intensity beams using an active target: Performance of MuSIC@Indiana Rohit Kumar, James E Johnstone, Sylvie Hudan, Varinderjit Singh, Romualdo T Desouza, Jacob Allen, Dan W Bardayan, Drew Blankstein, Chevelle Boomershine, Scott R Carmichael, Adam M Clark, Sydney Coil, Samuel L Henderson, Patrick D O'Malley Next generation radioactive beam facilities namely the Facility for Rare Isotope Beams (FRIB), enable measurement of the fusion cross-section for neutron-rich light nuclei almost to the drip-line. To overcome the low-intensity of these exotic beams, an active thick-target approach is necessary. Efficient measurement of the fusion cross-section at near-barrier energies is realized using a Multi-Sampling Ionization Chamber (MuSIC). The design, construction and characterization of MuSIC@Indiana are described. The device was commissioned by measuring the 18O+12C fusion excitation function for 11 MeV < Ecm < 20 MeV using CH4 gas. With MuSIC@Indiana,15 points on the fusion excitation function are extracted using a single incident beam energy. Two-body events and proton capture events are cleanly distinguished from fusion on carbon. The resulting excitation function is shown to be in good agreement with literature data. Advanced analysis techniques provide a reduction in the uncertainty of the fusion energy (Ecm) by a factor of approximately three over the standard approach. |
Tuesday, October 12, 2021 2:48PM - 3:00PM |
FJ.00005: Development of FIREBall with Geant4 Kevin Lee, Christina Dulal, Wanpeng Tan, SHELLY R LESHER, Armen Gyurjinyan, Ani Aprahamian Measurement of conversion electrons in coincidence with gamma rays is an important aspect of nuclear structure studies. We are building on the current existing Internal Conversion Electron Ball (ICEBall) mini-orange array of SiLi detectors to construct an improved fInternal ConveRsion Electron Ball (fIREBall) array with improved efficiency and performance. The current array of six mini-orange Si(Li) detectors will be replaced with six new, thicker Si(Li) detectors and the magnet filters will be replaced with new, optimized designs. The magnetic elements are used to create a field that the electrons follow after being produced in nuclear reactions. The goal is to improve the efficiency of collecting the electrons with a redesign of the magnetic elements. Using a combination of FreeCAD, COMSOL, and Geant4, we created an efficient, working simulation to identify magnet shapes that would improve the absolute efficiency. We have completed preliminary experimental tests of the simulations with our new magnet shapes and will proceed onto repeating a previous experiment on ICEBall, a 152,154Sm(α,2n)154,156Gd reaction, to determine the improvements achieved, specifically in coincidence measurements. The results from our magnet tests and details about our upcoming run will be presented. |
Tuesday, October 12, 2021 3:00PM - 3:12PM |
FJ.00006: The commissioning and performance of the Notre Dame Multi-Reflection Time-of-Flight Mass Spectrometer Biying Liu, Maxime Brodeur, Daniel P Burdette, Jason A Clark, James M Kelly, Jacob Long, Patrick D O'Malley, Dwaipayan Ray, Guy Savard, Adrian A Valverde The future N = 126 factory at Argonne National Laboratory aims to produce many isotopes on the neutron-rich side of the nuclear chart utilizing multi-nucleon transfer reactions. Especially, it can provide many important neutron-rich nuclei around the N = 126 abundance peak of the astrophysical rapid neutron capture process. Some experiments, such as high-precision mass measurements, benefits from nearly isobaric-free ion beams. To remove the isobaric contaminants, a multi-reflection time-of-flight mass spectrometer (MR-TOF) has been built and successfully commissioned off-line at the University of Notre Dame and has reached a resolving power of 70,000, with an efficiency of 10%. This resolving power could potentially be improved by better ion optics or power supplies stability. The low efficiency is due to the large beam emittance and potential misalignment in the off-line commissioning setup. Based on extensive ion-optics simulations, with the low emittance beam provided by the cooler-buncher as well as better alignment and power supplies stability, the MR-TOF can reach a resolving power of over 100,000 with an efficiency of 100%. Better performance of the MR-TOF is expected in the following online commissioning at Argonne National Laboratory. |
Tuesday, October 12, 2021 3:12PM - 3:24PM |
FJ.00007: Using Fast Simulations to Optimize Hybrid Tracking Concept for ATHENA at EIC Nicholas Lukow The upcoming Electron-Ion Collider (EIC) presents an opportunity to develop a new generation of detectors best suited to the science needs of the new facility. One of the tracking detector concepts explored by the ATHENA collaboration is a hybrid tracking detector which uses Silicon trackers as well as micro-pattern gas detectors. Before the tracking subsystems are integrated into a fully simulated detector using detailed simulations, fast simulations using a Geant4-based Fun4All framework are used to aid in the design of the tracking detectors. These simulations are used to optimize the tracking subsystems to better meet the requirements to achieve the physics goals of the EIC. Presented here are a selection of studies used to optimize the design of the hybrid tracker concept. |
Tuesday, October 12, 2021 3:24PM - 3:36PM |
FJ.00008: Neutron capture studies of uranium oxide targets prepared by spin-coating assisted combustion Ashabari Majumdar, Khachatur Manukyan, Stefania Dede, Jordan Roach, Wanpeng Tan, Aaron J Couture, Peter C Burns, Ani Aprahamian Neutron capture data of actinides are of interest for basic nuclear science as well as applications including the study of the advanced nuclear fuel cycle and stockpile stewardship. For these, data on actinide nuclei is obtained by nuclear experiments and one of the essential requirements for getting reliable and precise data from experiments is robust, uniform and cost-efficient actinide targets. The conventional target making methods do not meet these requirements for actinides targets. High quality uranium targets were developed by combining spin coating and combustion synthesis and the performance was tested in a neutron capture experiment at LANSCE located at LANL. The targets showed consistent performance throughout the radiative neutron capture experiment without a sign of degradation. A number of surface characterization techniques (X-ray fluorescence, a-spectroscopy and transmission electron microscopy) has been carried out to inspect the target characteristics before and after the experiment. We checked on the sustainability and robustness of the targets that we produced. TEM reveals emergence of porous structures on the beam front surface of the targets after irradiation. The impact of porous structure on nuclear science experiments is yet to be determined. |
Tuesday, October 12, 2021 3:36PM - 3:48PM |
FJ.00009: Preliminary Simulations of the Multi-layer Active target for MoNA Experiments (MAME) Nicholas Mendez, Thomas Redpath, Phuonganh Pham, Paul L Gueye The study of neutron unbound systems via the invariant mass technique is the primary focus of the MoNA Collaboration, which built and operates the MOdular Neutron Array (MoNA) and the Large multi-Institutional Scintillator Array (LISA). Reaction cross-sections for producing neutron unbound systems from radioactive ion beams (RIBs) can be small, 0.1-1mb, and the use of a thick reaction target degrades the resolution of the measurement. As an upgrade to a pre-existing Si-Be segmented target, the Gas Electron Multiplier (GEM) technology is being investigated for its use in a Multi-layer Active target for MoNA Experiments (MAME) for the Collaboration's research program at the Facility for Rare Isotope Beams (FRIB). A GEM-based detector could allow for a higher degree of Be-foil segmentation. Performance studies are conducted using Garfield++ to understand how the electron gain is impacted by GEM type (thick vs. thin), applied potential, and gas properties. A Geant4 simulation is being developed to model the detector properties along with the physics of the reaction/decay process. Preliminary results from simulation-based sensitivity studies will be discussed. |
Tuesday, October 12, 2021 3:48PM - 4:00PM |
FJ.00010: Quantum Enhanced Tracker for Charged Particles S Zhang We report the study and development of a novel new charged particle detector, a "Quantum Enhanced Tracker" for 3D imaging of charged particle tracks. The proposed detector relies on, and benefits from, the extremely high sensitivity of atoms, prepared in a specific quantum superposition, to external perturbations. Atoms are prepared in a so-called "dark superposition", which inhibits fluorescence. A passing charged particle will disturb this quantum state, allowing atoms to absorb probe light and to fluoresce, enabling direct imaging of the particle trajectory with high resolution. This method has similarities with Cherenkov detectors where a charged particle produces light along its track, but with the major advantages of enhanced sensitivity due to the low energy required to perturb the engineered quantum state, the ability to amplify the signal using a drive laser passing through the medium, and the ability to provide a 3D track. |
Follow Us |
Engage
Become an APS Member |
My APS
Renew Membership |
Information for |
About APSThe American Physical Society (APS) is a non-profit membership organization working to advance the knowledge of physics. |
© 2024 American Physical Society
| All rights reserved | Terms of Use
| Contact Us
Headquarters
1 Physics Ellipse, College Park, MD 20740-3844
(301) 209-3200
Editorial Office
100 Motor Pkwy, Suite 110, Hauppauge, NY 11788
(631) 591-4000
Office of Public Affairs
529 14th St NW, Suite 1050, Washington, D.C. 20045-2001
(202) 662-8700