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 MI: Nuclear Theory IV |
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Chair: Dean Lee, Michigan State University Room: Hyatt Regency Hotel Imperial 12 |
Sunday, October 30, 2022 8:30AM - 8:42AM |
MI.00001: Ab initio elastic scattering from light nuclei based on different chiral two-nucleon forces Charlotte Elster, Robert B Baker, Pieter Maris, Gabriela Popa, Stephen P Weppner, Matthew B Burrows Effective interactions (`optical potentials') derived from first principles to describe the elastic |
Sunday, October 30, 2022 8:42AM - 8:54AM |
MI.00002: Ab initio theory for heavy nuclei and physics beyond the standard model Jason D Holt Breakthroughs in our treatment of the many-body problem in strongly interacting systems, as well as nuclear forces, are rapidly transforming modern nuclear theory into a global first-principles discipline. This allows us to address some of the most exciting questions at the frontiers of nuclear structure and physics beyond the standard model (BSM), such as the nature of dark matter, neutrino masses, and searches for violations of fundamental symmetries in nature. |
Sunday, October 30, 2022 8:54AM - 9:06AM |
MI.00003: Ab initio prediction of 4He(d,γ)6Li at big-bang nucleosynthesis energies Chloë Hebborn, Guillaume Hupin, Konstantinos Kravvaris, Sofia Quaglioni, Petr Navratil, Peter H Gysbers
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Sunday, October 30, 2022 9:06AM - 9:18AM |
MI.00004: An ab-initio informed evaluation of the 6Li(n,t)4He reaction Konstantinos Kravvaris, Sofia Quaglioni, Petr Navratil, Guillaume Hupin Neutron reaction cross section standards play an important role in the measurement of neutron-induced reaction cross sections. Since such standards depend on accurate measurements and their robust evaluation, they are continuously assessed, updated, and improved. We present an ab initio approach to the evaluation of one neutron standard, namely, the 6Li(n,t)4He reaction cross section. Starting from an ab initio calculation of the elastic and inelastic low-energy neutron-induced reactions on 6Li, we incorporate phenomenological corrections extracted from available experimental data. Because of the high correlation of the cross section across the standard energy range we are able to provide a constrained evaluation coupled with predictive capabilities. |
Sunday, October 30, 2022 9:18AM - 9:30AM |
MI.00005: Cold Neutron Capture on the Deuteron around Wigner-SU(4) limit in Pionless Effective Field Theory Xincheng Lin, Hersh Singh, Jared Vanasse, Roxanne P Springer Radiative capture of cold neutron by deuteron ($nd\to \gamma t$) is interesting because its isospin-mirror process is important in big bang nucleosynthesis and its time reversed process is relevant for experiments at the Triangle Universities Nuclear Laboratory (TUNL)/High Intensity Gamma Source (HIGS). We compute the cross section of this process ($\sigma_{nd\to\gamma t}$) strictly perturbatively in pionless effective field theory (EFT) and expand it around the Wigner-SU(4) (spin-isospin) limit. We show that, although the Wigner-SU(4) symmetric part of the triton wave function dominates the full triton wave function in the zero-recoil limit [1], its contribution to $\sigma_{nd\to\gamma t}$ is suppressed relative to the contribution from energy-dependent three-body forces, which only appears starting at next-to-next-to-leading-order (NNLO) in pionless EFT. I will discuss the expansion around the Wigner-SU(4) limit and its impact on the power counting of this calculation. |
Sunday, October 30, 2022 9:30AM - 9:42AM |
MI.00006: Low-energy effective field theory of the deuteron Son T. Nguyen We study neutron-deuteron ($nd$) and proton-deuteron ($pd$) scatterings in two $S$-wave and five $P$-wave channels at low energies below the breakup momentum of the deuteron ($\Lambda_d\approx 45.7$ MeV) using the effective field theory developed in Ref. [1]. At this energy range, the deuteron can be considered a point-like particle, and Coulomb interaction in $pd$ scattering must be treated non-perturbatively. We will discuss the calculation of several low-energy observables for both systems and comparison to available experimental data. |
Sunday, October 30, 2022 9:42AM - 9:54AM |
MI.00007: Expansion around the unitarity limit for bosonic few-body systems Feng Wu Bosonic few-body ($A \leq 4$) systems with a large scattering length and a short effective range in the two-body sector are studied in the framework of short-range effective field theory. We start from the unitarity limit at leading order. The finite scattering length and range corrections, and a four-body force required by renormalization are included at next-to-leading order. We expect to extend our approach to nuclear systems in which more internal degrees of freedom and the Coulomb interaction should be considered. |
Sunday, October 30, 2022 9:54AM - 10:06AM |
MI.00008: Schrodinger Equation with Relativistic Kinematics and the Yukawa potential Sungwook Lee, Shwe S Oo, Pathapratim Biswas, Khin M Maung Maung Even after many decades of its first appearance, the Yukawa potential is still of interest for many problems. We focus on the bound state problem with Yukawa potential in a Schrodinger equation with relativistic kinematics. We employ some approximations together with Laplace transform methods. Our results will be compared with numerical results calculated in momentum space. |
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