Bulletin of the American Physical Society
Fall 2022 Meeting of the APS Division of Nuclear Physics
Volume 67, Number 17
Thursday–Sunday, October 27–30, 2022; Time Zone: Central Daylight Time, USA; New Orleans, Louisiana
Session LM: Undergraduate Research II |
Hide Abstracts |
Chair: Riccardo Longo, University of Illinois at Urbana-Champai Room: Hyatt Regency Hotel Imperial 9 |
Saturday, October 29, 2022 2:00PM - 2:12PM |
LM.00001: Investigations of Jet Quenching in Peripheral Pb+Pb Collisions at 5.02 TeV with ATLAS Morgan B Knuesel The quark-gluon plasma (QGP) is an exotic state of matter consisting of deconfined quarks and gluons which is produced in collisions of heavy ions at relativistic energies. With the ATLAS detector at the Large Hadron Collider, we seek to further characterize one of the most important signatures of QGP formation, known as jet quenching. Specifically, we address the question of where jet quenching begins in the spectrum of various collision systems. A recent ATLAS study shows a lack of jet quenching in p+Pb collisions, suggesting that a study of jet quenching in peripheral Pb+Pb collisions (in which only a few of the incoming nucleons participate) will be a useful tool in answering this question. This study reports jet-triggered hadron yields – an observable sensitive to jet quenching – as a function of event centrality in Pb+Pb collisions. The data selected consists of hadrons correlated with high-pT, anti-kT R = 0.4 jets from 5.02 TeV Pb+Pb collisions. To select peripheral events in an unbiased way, we utilize the ATLAS Zero-Degree Calorimeters to define event centrality. Finally, we compare these yields with those in 5.02 TeV pp collisions, in which no jet quenching is observed. |
Saturday, October 29, 2022 2:12PM - 2:24PM |
LM.00002: An LED-based calibration system for the new ATLAS Reaction Plane Detector in LHC Run 3 Yi Liu, Riccardo Longo, Daniel R MacLean, Matthias Perdekamp, Chad Lantz, Xuesi Ma In 2022, Long Shutdown 2 (LS2) ended, and Run 3 of the CERN Large Hadron Collider (LHC) began. LS2 offered the opportunity of constructing a new Reaction Plane Detector (RPD) for the ATLAS experiment, a novel device aimed at mapping the transverse profile of the shower induced by spectator neutrons in the ATLAS Zero Degree Calorimeter (ZDC) during heavy ion data taking. |
Saturday, October 29, 2022 2:24PM - 2:36PM |
LM.00003: Optimization of Air Light Guides for New ATLAS and CMS Zero Degree Calorimeters for LHC High Luminosity Operations Samantha R Lund, Matthias Perdekamp, Riccardo Longo, Paul D Malachuk, Benjamin Liu, Chad Lantz, Aric C Tate The transition to High Luminosity (HL) operations of the CERN LHC requires the upgrade of several detector systems. One of these systems are the Zero Degree Calorimeters (ZDCs) in ATLAS and CMS, which are used for triggering and event geometry characterization in Heavy Ion (HI) collisions. |
Saturday, October 29, 2022 2:36PM - 2:48PM |
LM.00004: Optical Transmission Measurements of Fused Silica Materials Irradiated to MGy Scale at the CERN Large Hadron Collider Xuesi Ma, Riccardo Longo, Matthias Grosse Perdekamp, Sheng Yang, Kristopher D Young, Zvi Citron, Stefano Mazzoni The High-Luminosity (HL) upgrade of the CERN LHC will significantly increase its collision rate, giving rise to an extremely high-radiation environment that results in significant challenges for forward detectors, such as the Zero Degree Calorimeters (ZDCs) of the ATLAS and CMS experiments. Because they share the same radiation environment and technological challenges, the ATLAS and CMS ZDC groups formed the Joint Zero degree Calorimeter Project (JZCaP) to design and construct the new generation of ZDCs for the HL-LHC. The Nuclear Physics Lab at the University of Illinois leads the JZCaP effort. |
Saturday, October 29, 2022 2:48PM - 3:00PM |
LM.00005: Gain Characterization of Photo-Multiplier Tubes used in the ATLAS ZDC Reaction Plane Detector for LHC Run 3 Paul D Malachuk, Riccardo Longo, Matthias Grosse Perdekamp, Anna Przybyl, Kristopher D Young, Matthew C Hoppesch Long Shutdown 2 (LS2) of the CERN LHC offered the opportunity to expand the physics capabilities of existing experiments. Over this period, the Nuclear Physics Laboratory at the University of Illinois at Urbana-Champaign designed and constructed a new Reaction Plane Detector (RPD) for the ATLAS experiment to be integrated within the ATLAS Zero Degree Calorimeter (ZDC) during heavy ion (HI) data taking. The RPD consists of 256 vertical, 0.7\~mm diameter radiation hard fused silica fibers of four different lengths. The Cherenkov light from the fibers is read by 16 Photo-Multiplier Tubes (PMTs). The PMT signals are read out with waveform digitizers on the ATLAS LUCROD readout board. The PMT signals are used to build a 4x4 tile mapping of the shower in the transverse plane. Given limited space for HV cables in the LHC tunnel, the PMTs will be powered in groups of 4 using voltage divider circuits. Based on gain calibrations for each PMT, they are grouped to minimize effects from tube-to-tube variations. The gain calibration will also be used to calibrate the channel-by-channel gain amplifiers on the LUCROD. |
Saturday, October 29, 2022 3:00PM - 3:12PM |
LM.00006: A New LED Pulser Board For The ATLAS Reaction Plane Detector in LHC Run 4 Kristopher D Young, Riccardo Longo, Matthias Grosse Perdekamp, Daniel R MacLean, Yi Liu, Mandela Phillips, Christian Hornhuber, Michael Murray The CERN LHC is projected to complete the High-Luminosity (HL) upgrade by 2029, marking the start of Run 4. Several detector sub-systems will be upgraded to meet the challenges resulting from the unprecedented particle collision rate achieved by the accelerator. One such system is the Zero Degree Calorimeter (ZDC) for both the ATLAS and CMS experiments. |
Saturday, October 29, 2022 3:12PM - 3:24PM |
LM.00007: Uncertainty Quantification in Local Chiral Nuclear Interactions Katelyn Putnam, Rodrigo Navarro Perez Although the interaction between neutrons and protons can be understood in terms of quarks exchanging gluons, the implementation of such interaction for nuclear structure calculations remains out of computational reach. Instead, potential models are derived from effective field theories which provide an approximation to the actual interaction. Although these models have already been adjusted to fit experimental scattering data, the uncertainties in the adjustable parameters were not initially quantified. We have implemented previously derived potentials so that we can redo the optimization, this time propagating experimental uncertainties to potential parameters. To do this, we implemented the derivatives of scattering observables with respect to the adjustable parameters, and new fits have been made that allow us to calculate their covariance matrix. We have obtained the uncertainty on parameters of local chiral interactions that other researchers will be able to use to account for uncertainty in their own experimental analysis and theoretical nuclear structure calculations. |
Saturday, October 29, 2022 3:24PM - 3:36PM |
LM.00008: Principal component analysis of shell-model interactions Vladimir Bautista, Jordan M Fox, Calvin W Johnson We carry out principal-component analysis of nuclear shell model interactions in the p-, sd-, and pf-shells. We also analyze the most important linear combinations with respect to standard schematic forces such as pairing, quadrupole-quadrupole, etc.. Despite the very different mass regions we find similar behaviors, pointing towards underlying principles. |
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