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 MH: Mini-Symposium: Time Reversal Invariance Violation |
Hide Abstracts |
Chair: Leah Broussard, Oak Ridge National Lab Room: Hyatt Regency Hotel Celestin H |
Sunday, October 30, 2022 8:30AM - 8:42AM |
MH.00001: The Los Alamos National Laboratory Neutron Electric Dipole Experiment Felicity Hills The Standard Model predicts a neutron electric dipole moment (nEDM) on the order of 10-32 e-cm. An nEDM greater than this predicted value would provide evidence for time reversal symmetry violating physics beyond the Standard Model. The LANL nEDM experiment in development at the Los Alamos National Laboratory ultracold neutron source aims to measure the neutron EDM at room temperature with an uncertainty of ~ 3x10-27 e-cm using Ramsey's separated oscillatory field method. This talk will provide an overview and status of the experiment. |
Sunday, October 30, 2022 8:42AM - 8:54AM |
MH.00002: Opportunities to search for P-even/T-odd interactions using polarized neutron optical transmission in compound nuclear resonances William M Snow Observation of an electric dipole moment in nucleons or nuclei can be caused by a new P-odd/T-odd interaction. It can also in principle result from a new P-even/T-odd interaction coupled with a P-odd electroweak radiative correction. It is therefore useful to consider how to conduct more sensitive searches for P-even/T-odd interactions between nucleons. We will present some possibilities using polarized neutron optical transmission on neutron-nucleus resonances. |
Sunday, October 30, 2022 8:54AM - 9:06AM |
MH.00003: Measuring the Efficiency of Atomic Beam Sources Using Harvested Isotopes at FRIB for Fundamental Symmetry Measurements with Improved Precision Gordon Arrowsmith-Kron, Kevin G Bailey, Michael N Bishof, Matthew R Dietrich, Matt D Gott, John P Greene, Peter Mueller, Thomas O'Connor, Roy A Ready, Gregory Severin, Jaideep Singh Nuclei such as Radium-225 or Radium-223 are proposed to have an enhanced sensitivity to Electric Dipole Moment (EDM) measurements. Beams producing these kinds of isotopes will be produced in the water beam dump at the Facility for Rare Isotope Beams (FRIB) at Michigan State University. We will report our efforts to measure the efficiency of forming an atomic beam from these harvested isotopes using laser-induced fluorescence on chemical surrogates. In addition, we report efforts to improve the reversability of the electric field in our EDM measurement by using a unipolar power supply. |
Sunday, October 30, 2022 9:06AM - 9:18AM |
MH.00004: NOPTREX: A Search for Time-Reversal Invariance Violation in Polarized Neutron-Nuclear Resonance Interactions Danielle C Schaper One of the motivations to search for new physics Beyond the Standard Model (BSM) is to understand the baryon asymmetry present in the Universe, namely the discrepancy between the theoretical prediction of the baryon asymmetry based on the SM and the value obtained through observations of the cosmic microwave background. The Neutron OPtics Time Reversal EXperiment (NOPTREX) Collaboration seeks to measure signatures of parity-odd (P-odd) and time-reversal-symmetry-odd (T-odd) interactions in polarized neutron transmission through polarized nuclear targets which contain p-wave resonances in the eV energy range. This can be done through the use of neutron transmission resonance spectroscopy. The relative strength of the weak and strong coupling constants is known to be ~10-7; however, the many-body nature of a resonant compound nuclear system results in amplification effects specific to the weak interaction which can increase the discovery potential for such a measurement by a factor of 105-106, making this an attractive system in which to study T-violation. This talk will outline the status of our work on the neutron-nucleus resonance spectroscopy techniques needed to quantify the sensitivity which can be attained through this approach.
|
Sunday, October 30, 2022 9:18AM - 9:30AM |
MH.00005: Time-reversal breaking in isospin-hindered 47K β decay John A Behr, Melisa Ozen, Felix Klose, Alexandre Gorelov, James C McNeil, Dan G Melconian, Gerald Gwinner, Melissa Anholm Isospin-hindered Fermi transitions in β decay enhance sensitivity to time-reversal violation (TRV) effects in the progeny nucleus [Barroso and Blin-Stoyle [Phys Lett 45B 178 (1973)]. A key figure of merit is the ratio of the TRV matrix element to the Coulomb interaction's isospin-breaking matrix element (rather than strong interaction matrix elements), potentially enhancing sensitivity by orders of magnitude. We will show progress towards the isospin-hindered Fermi/Gamow-Teller 81% decay branch of 47K, for which measurements of the TRV correlation D I . vβ X vν are possible using TRIUMF's Neutral Atom Trap for β decay (TRINAT). A γ-β-tensor alignment correlation using polarized RIB and modern segmented spectrometers has similar TRV sensitivity. We will first measure the isospin breaking using the asymmetry of emission of the nuclear progeny with respect to the initial spin, which vanishes for pure G-T decay [J.R.A. Pitcairn et al. Phys Rev C 79 015501 (2009)] and is linear in the isospin breaking Fermi matrix element. Compact high photopeak efficiency, high resolution GAGG scintillators may enable resolving final states to measure the isospin breaking with TRINAT. |
Sunday, October 30, 2022 9:30AM - 9:42AM |
MH.00006: What is Known About the Sensitivity of Pa-229 to Time-Reversal Violating Interactions? Jaideep Singh Electric dipole moments (EDMs) are signatures of time-reversal (T), parity (P), & charge-parity (CP) violation. CP violation beyond the Standard Model is generally believed to be required to explain the observed prevalence of matter over antimatter in the universe. Protactinium-229 (t = 1.5 d, I = 5/2) is mostly sensitive to T- and P-violating interactions originating within the nucleus. The best limits on these types of exotic interactions are derived from the atomic EDM limit for Mercury-199. Because of its unusual pear-shaped nuclear structure (octupole deformation), Pa-229 is expected to have a physics sensitivity that is orders of magnitude higher than Hg-199. The exact sensitivity enhancement factor is currently unknown but may be as high as six orders of magnitude higher than Hg-199. We will review what is currently known about the nuclear structure of Pa-229 in relation to time-reversal violation and prospects for future experiments to clarify this issue. |
Sunday, October 30, 2022 9:42AM - 9:54AM |
MH.00007: Electric dipole moment from lattice QCD Andrea Shindler The observed baryon asymmetry in the universe cannot be |
Sunday, October 30, 2022 9:54AM - 10:06AM |
MH.00008: Two-body matrix elements for symmetry violating interactions. Vladimir Gudkov Parity violating (PV) and time reversal invariance violating (TRIV) two-body matrix elements are calculated for heavy nuclei in the shell-model framework using Desplanques-Donaghue-Holstein and effective field theory interactions representations. A comparative analysis of PV and TRIV matrix elements illustrates a sensitivity of TRIV effects in nuclear reactions to particular mechanisms of TRIV at low energy nuclear interactions. |
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