Bulletin of the American Physical Society
86th Annual Meeting of the APS Southeastern Section
Volume 64, Number 19
Thursday–Saturday, November 7–9, 2019; Wrightsville Beach, North Carolina
Session L02: Particle Physics II |
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Chair: Gavin Davies, University of Mississippi Room: Holiday Inn Resort Airlie/Tidewater |
Saturday, November 9, 2019 4:30PM - 4:42PM |
L02.00001: The CHANDLER Antineutrino Detector Shengchao Li CHANDLER is a detector technology for reactor antineutrino monitoring. We deployed a prototype detector, called MiniCHANDLER, in proximity to a commercial nuclear reactor core for four months, and observed strong inverse beta decay signal with no overburden and minimal shielding. In this talk, we will present the technical details, the data analysis and the first result from this prototype deployment, and other experimental measurements related to the CHANDLER technology. [Preview Abstract] |
Saturday, November 9, 2019 4:42PM - 4:54PM |
L02.00002: Results from the Complete EXO-200 Dataset Tim Daniels EXO-200 was a low-background time-projection chamber employing a stockpile of 200 kg of xenon enriched to 80.6{\%} in isotope 136 and located underground at the WIPP site outside Carlsbad NM. In its first phase of data-taking between September 2011 and February 2014, the experiment made the first observation of two-neutrino double-beta decay of~136Xe, provided the most precise measurement of any two-neutrino half-life to date, and provided one of the most sensitive searches for neutrinoless double-beta decay. While the first phase ended with the 2014 fire and radiation events at WIPP, a second phase of data collection with upgrades including improved energy resolution extended from May 2016 -- December 2018. Analysis of the complete EXO-200 dataset, representing a total $^{\mathrm{136}}$Xe exposure of 234.1 kg-yr, results in a lower limit of 3.5*10$^{\mathrm{25\thinspace }}$yr on the zero-neutrino double-beta decay half-life, with a median sensitivity of 5.0*10$^{\mathrm{25}}$ yr. [Preview Abstract] |
Saturday, November 9, 2019 4:54PM - 5:06PM |
L02.00003: Vector and scalar potentials in the one-dimensional Dirac equation Walter Jaronski It is well known that the Dirac equation admits no bound states for the linear potential if this potential is treated as the time component of a Lorentz vector. Bound states exist, however, if the potential is added to the equation as a Lorentz scalar, i.e., with the same status as the mass. This behavior exists even if the equation is considered with only one spatial dimension, but with simplifications resulting from the absence of spin-angular factors. In this study, we investigate the solutions of the one-dimensional Dirac equation for Lorentz vector and Lorentz scalar interactions. Simple rectangular well potentials are first considered in order to test procedures. The interesting case of the linear potential is then treated. As already stated, the linear vector potential admits no bound states. This is due to coupling to negative energy states. To study this further, the case of a triangular well is then studied. We find that bound states for a vector triangular well disappear as the width of the well increases. [Preview Abstract] |
Saturday, November 9, 2019 5:06PM - 5:18PM |
L02.00004: Unification of Forces and Particles by a Bound Photon Model Ramiro Montalvo The bound photon model postulates all massive elementary particles are composed of one or more photon pairs with opposite momentum bound by an interaction that reflects the photons over a distance near their wavelength. Recent experimental evidence reveals the binding of photon pairs of into bosons as quantized states of orbital angular momentum validating the postulate of the bound photon (BP) model for bosons. When the BP model is subjected to the same constraints that yielded the Dirac equation, the BP model solution is very similar to the Dirac solution, the difference being that the Dirac solution uses a massive propagator while the BP model solution uses two massless propagators to describe a single massive particle. The propagator difference modifies QED which is the foundation of the theories that follow thus forcing simplifying changes to the weak theory and QCD. The justification for the changes to the current theories will be described as limited by the time available. The BP model resolves some of the problems and shortcomings of the standard model and provides a fairly clear new direction for the solution of others. A preliminary report of the model is available in the French archive at: hal.archives-ouvertes.fr ID: “hal-01790320”. [Preview Abstract] |
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