Bulletin of the American Physical Society
6th Joint Meeting of the APS Division of Nuclear Physics and the Physical Society of Japan
Sunday–Friday, November 26–December 1 2023; Hawaii, the Big Island
Session F13: Nuclear Theory II |
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Chair: Gregory Potel, Lawrence Livermore Natl Lab Room: Hilton Waikoloa Village Kona 2-3 |
Thursday, November 30, 2023 9:00AM - 9:15AM |
F13.00001: Entanglement and Quantum Simulations of Nuclear Many-Body Systems Caroline E Robin, Martin J Savage, Marc Illa, Momme Hengstenberg Recently, increasing effort has been devoted to re-examining quantum many-body systems from the point of view of quantum information. In particular, there has been renewed interest in understanding the phenomenon of entanglement due to its essential role in quantum computing and potential guidance in formulating the many-body problem. |
Thursday, November 30, 2023 9:15AM - 9:30AM |
F13.00002: Error and Sensitivity Estimation of Excited States of the Lipkin model on NISQ Devices John F Novak, Manqoba Q Hlatshwayo Building on prior work simulating excited states of the Lipkin model using the quantum equation of motion (qEOM) method, we present results estimating both the error introduced by running this method on a noisy intermediate-scale quantum computer (NISQ device) and the sensitivity of the results on the ground state parameterization. The qEOM is a quantum generalization of the EOM method on classical computers and is built of collective excitations based on quasiboson operators $hat{O}^dagger_n(alpha)$ of increasing configuration complexity $alpha$. The qEOM method shows promise in this context because increases in configuration complexity do not have a corresponding increase in the number of measurements needed on a quantum computer. However, increases in configuration complexity do potentially increase the sensitivity on the ground state parameterization and the uncertainty of excited state energy spectra. Utilizing the efficient encoding scheme of prior work we use IBM quantum computer to compute the energy spectra for a system of $N=8$ particles and complexities $alpha=1$, and 2 (corresponding to random phase approximation and second random phase approximation). We show, in particular, that the ground state wave function is robust to variations in the parameterization and that the error introduced by the quantum computer is a function of configuration complexity and effective interaction strength. |
Thursday, November 30, 2023 9:30AM - 9:45AM |
F13.00003: First principles studies on ordinary muon capture Lotta Jokiniemi Ordinary muon capture is a nuclear-weak process in which a negatively charged muon, initially bound on an atomic orbit, is captured by the atomic nucleus, resulting in atomic number reduction by one and emission of a muon neutrino. Thanks to the high momentum transfer involved in the process, it is one of the most promising probes for as yet hypothetical neutrinoless double-beta decay. With the recent renaissance of muon-capture experiments, reliable theory predictions for muon capture are now of paramount importance. |
Thursday, November 30, 2023 9:45AM - 10:00AM |
F13.00004: Neutrino scattering off $^{16}$O in coupled-cluster theory Bijaya Acharya Accurately modeling the interactions of neutrinos with $^{16}$O is essential for neutrino experiments that employ (heavy) water Cherenkov detectors. Recent advances in the chiral-effective-field-theory description of nuclear forces and electroweak currents and in nuclear many-body theory have positioned us to obtain reliable predictions for $ u$-$^{16}$O cross sections up to the quasielastic kinematic regime. I will present recent results for inclusive response functions computed in coupled-cluster theory, which goes beyond the mean-field approximation to approach the exact numerical solution of the many-body Schroedinger equation as a controlled expansion. I will discuss the prospect of providing vital theory support for controlling the systematic uncertainty in the future T2HK experiment in Japan. |
Thursday, November 30, 2023 10:00AM - 10:15AM |
F13.00005: Generator coordinate method with optimum basis Moemi Matsumoto, Yusuke Tanimura, Kouichi Hagino The generator coordinate method (GCM) has been a well-known method to describe nuclear collective motions. In GCM, one a priori specifies collective degrees of freedom (collective coordinates), such as nuclear deformations, and superposes many Slater determinants (SDs) within the selected collective subspace. However, there always exists arbitrariness in this approach in the choice of collective coordinates, for which one has to rely on an empirical and phenomenological theory. With such choice, it is not trivial whether the collective motion of interest can be optimally described. Therefore, a description of the collective motion without pre-set collective coordinates is desirable in order not to miss important degrees of freedom. |
Thursday, November 30, 2023 10:15AM - 10:30AM |
F13.00006: Anchor-based optimization of energy density functionals Anatoli Afanasjev, Ahmad Taninah, Udeshika C Perera, Saja Teeti, Bernard Osei A new anchor-based optimization method of defining the energy density functionals (EDFs) |
Thursday, November 30, 2023 10:30AM - 10:45AM |
F13.00007: Microscopic descriptions of nuclear electromagnetic transitions with the finite-amplitude method Tong Li, Nicolas F Schunck Electromagnetic transitions of atomic nuclei, such as photoabsorption and gamma decay, play important roles in the understanding of reactions involved in nucleosynthesis and radiochemistry. The development of a reliable theoretical model for the descriptions of nuclear electromagnetic transitions is essential, since many nuclei involved in our applications are close to drip lines and have not been accessed by experiments. In this talk I will discuss our recent development of the finite-amplitude-method (FAM) code for the microscopic calculations of electromagnetic transitions within the framework of nuclear density functional theory. This method can be used to study the gamma decay of even-even, odd-A and odd-odd nuclei, as well as nuclear systems with a finite temperature. Our program is highly optimized and parallelized for large-scale calculations through the whole nuclear chart. We expect that our model will provide valuable nuclear-structure inputs for future reaction studies.
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Thursday, November 30, 2023 10:45AM - 11:00AM |
F13.00008: Differential charge radii: Proton-neutron interaction effects Anatoli Afanasjev, Udeshika C Perera The analysis of self-consistency and proton-neutron interaction effects in the buildup of differential charge |
Thursday, November 30, 2023 11:00AM - 11:15AM |
F13.00009: Recent developments of emulators for quantum continuum states Xilin Zhang Quantum continuum states are numerically expensive to compute for systems with more than two particles. Repeating these calculations many times with different theory inputs is even more daunting. However, the outputs of those calculations are needed to explore the theory’s parameter space, for example, in the context of Bayesian model calibrations. To overcome these challenges, nuclear theorists are actively developing continuum-state emulators, which enable fast and accurate interpolations and extrapolations of theoretical calculations in their parameter spaces. |
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