Bulletin of the American Physical Society
APS April Meeting 2018
Volume 63, Number 4
Saturday–Tuesday, April 14–17, 2018; Columbus, Ohio
Session U11: Nuclear Theory III |
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Sponsoring Units: DNP Chair: Richard Furnstal, Ohio State University Room: A220-221 |
Monday, April 16, 2018 3:30PM - 3:42PM |
U11.00001: Quantum Chaos on 2 spin levels Declan Mulhall Random interactions with global symmetries exhibit regularities in the ensemble average sense. A model system of $N$ bosons on 2 spin levels having random 2-body collisions is examined. Robust regularities (in the ensemble average sense) arise, including the usual ones including ground state spin distributions peaked at extreme values of angular momentum, signatures of rotational bands, and smooth parabolic yrast lines. A simple random matrix theory analysis shows signatures of quantum chaos in the level spacing distribution and the $\Delta_3$ statistic. There are other interesting features including steps in the yrast lines and strong regularities in the in the pair transfer amplitude, as well as other collective features. [Preview Abstract] |
Monday, April 16, 2018 3:42PM - 3:54PM |
U11.00002: Weak processes in the two-nucleon sector Lucas Platter I will discuss recent results of calculations for weak processes in the two-nucleon sector. In particular, I will address the proton-proton fusion process for which we have carried out an uncertainty analysis in the S-wave sector and also obtained the universal p-wave contribution at threshold but also muon capture on the deuteron. All calculations shine light on the limits of accuracy in nuclear electroweak calculations. [Preview Abstract] |
Monday, April 16, 2018 3:54PM - 4:06PM |
U11.00003: A harmonic solution for two-dimensional adjoint QCD Uwe Trittmann Two-dimensional QCD with adjoint fermions has many attractive features, yet its single-particle content remains largely unknown. Using the symmetry structure of the asymptotic theory where pair production is disallowed, a basis of the theory consisting of multi-dimensional harmonic functions is constructed for both the massless and the massive theory. Previously, only part of such a basis was known. It is shown how the basis can be used to furnish an exponentially converging numerical solution of the full theory. Furthermore, the role of pair production is investigated and light is shed onto the vexing problem of distinguishing single- from multi-particle states. Implications for bosonized versions of this theory and applicability of the method to other theories are discussed. [Preview Abstract] |
Monday, April 16, 2018 4:06PM - 4:18PM |
U11.00004: Three-Dimensional Lippmann-Schwinger Cross Section Model for Space Radiation Applications Charles Werneth, Xiaojing Xu, Ryan Norman, Khin Maung Space radiation transport codes utilize nuclear cross sections to describe the interaction of particles in the space radiation environment with shielding materials and are needed for estimates of dosimetric quantities of interest and measures of radiation risk. The highly-parameterized (\textgreater 60 parameters) Tripathi cross section model is often used by many Monte Carlo transport codes for prediction of reaction cross sections and is known to fit well to experimental data. However, predictions of any parameterization are questionable when used for estimates beyond the range of the data to which it is tuned. The present work shows that a three dimensional Lippmann-Schwinger (LS3D) equation model with relativistic kinematics predicts nucleon-nucleus and nucleus-nucleus cross sections as well as the Tripathi cross section. Additional advantages of the LS3D model include the ability to compute accurate elastic differential, total, and total elastic cross sections. The results of this research will show that the LS3D model with relativistic kinematics should be used for space radiation applications in which the kinetic energy of the projectile in the laboratory frame is greater than approximately 220 MeV/n. [Preview Abstract] |
Monday, April 16, 2018 4:18PM - 4:30PM |
U11.00005: Isotopically-Resolved Neutron Total Cross Sections as a Probe of Nuclear Structure Cole Pruitt Total neutron cross sections ($\sigma_{tot}$) are a direct, Coulomb-blind probe of nuclear forces and are tightly correlated with several bulk nuclear properties of great interest (neutron skin thickness, electric polarizability). While $\sigma_{tot}$ data have been collected on many natural samples, isotope-specific data, most valuable for understanding nuclear properties away from $\beta$-stability, are very sparse even for closed-shell nuclei. In light of this deficit, we have completed a campaign of isotopic-specific $\sigma_{tot}$ measurements on $^{16,18}$O, $^{40,48}$Ca, $^{58,64}$Ni, and $^{112,124}$Sn from 3-300 MeV. We present $\sigma_{tot}$ and isotopic differences and discuss the advantages and disadvantages of the waveform digitizer technology that enabled our measurements. We also discuss preliminary Dispersive Optical Model (DOM) fits employing these data, fits that, ultimately, will provide dispersively correct and non-local optical nucleon potentials and allow for predictions of neutron-skin thicknesses. [Preview Abstract] |
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