Bulletin of the American Physical Society
88th Annual Meeting of the Southeastern Section of the APS
Volume 66, Number 16
Thursday–Saturday, November 18–20, 2021; University Center Club, Florida State University, Tallahassee, Florida
Session M02: Advances in Theoretical Nuclear Physics II |
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Chair: Kevin Fossez, Florida State University Room: Pensacola |
Friday, November 19, 2021 2:00PM - 2:30PM |
M02.00001: Few-Body Physics in Finite Volume Invited Speaker: Sebastian Koenig Simulating quantum systems in a finite volume is a powerful theoretical tool to extract information about them. The pioneering work of Lüscher has shown that the real-world properties of the system are encoded in how its discrete energy levels change with the size of the volume. This approach is relevant not only for nuclear physics, where lattice methods are now able to calculate few- and many-nucleon states, but also for other fields such as simulations of cold atomic systems. In this talk, I will present recent progress that has been achieved in this area. In particular, I will discuss the case of charged particles in a finite periodic box, which is of particular relevance for nuclear physics because the vast majority of systems of interest in this field involve more than one charged particle. This work is supported in part by the National Science Foundation under Grant No. PHY-2044632. This material is based upon work supported by the U.S. Department of Energy, Office of Science, Office of Nuclear Physics, under the FRIB Theory Alliance award DE-SC0013617. [Preview Abstract] |
Friday, November 19, 2021 2:30PM - 2:45PM |
M02.00002: Properties of many-boson systems with random interactions Charles White, Alexander Volya The dynamics of quantum many-body systems is of paramount importance in many branches of science. The emergence of mean fields, the formation of effective degrees of freedom, and the appearance of dynamical symmetries are typically generic results of two-body interactions. While fermionic systems driven by random two-body interactions have been extensively studied in the past, bosonic systems are less understood. In this work, we study systems of bosons driven by random two-body interactions. We find that there are some statistical and collective limits that resemble the corresponding fermionic cases, however we also find that many-boson structures are significantly shaped by condensation and clusterization, which would be blocked by the Pauli principle for fermions. We present numerical studies and explore special analytic limits to support our findings. [Preview Abstract] |
Friday, November 19, 2021 2:45PM - 3:00PM |
M02.00003: Ab Initio Optical Potentials for Elastic Scattering at Low Energies Using the Symmetry- Adpated No-Core Shell Model Matthew Burrows Ab initio optical potentials for elastic scattering at low energy is of particular interest for experiments at rare isotope beam facilities. In this work we combine the ab initio symmetry-adapted no-core shell-model results [1,2] with the Green's function evaluation of the optical potential through a self-energy calculation [3,4]. Specifically, we show preliminary results for neutron elastic scattering off Helium-4 and Carbon-12 with projectile energies between 0.5 and 10 MeV. We also discuss the role of collectivity and present comparisons to earlier models. [1] T. Dytrych, K. D. Launey, J. P. Draayer, et al., Phys. Rev. Lett. 124, 042501 (2020) [2] K. D. Launey, A. Mercenne, and T. Dytrych, Annu. Rev. Nucl. Part. Sci. (2021) [3] J. Rotureau, P. Danielewicz, G. Hagen, F. M. Nunes, and T. Papenbrock, Phys. Rev. C 95, 024315 (2017) [4] A. Idini, C. Barbieri, and P. Navrátil, Phys, Rev. Lett. 123, 092501 (2019) [Preview Abstract] |
Friday, November 19, 2021 3:00PM - 3:15PM |
M02.00004: Fission barriers as nuclear input for r-process simulation in covariant density functional theory Ahmad Taninah, S. E. Agbemava, A. V. Afanasjev The systematic investigation of the ground state and fission properties of even-even actinides and superheavy nuclei with $Z=90-120$ from the two-proton up to two-neutron drip lines with proper assessment of systematic theoretical uncertainties has been performed for the first time in the framework of covariant density functional theory (CDFT). These results provide a necessary theoretical input for the r-process modeling in heavy nuclei. Four state-of-the-art globally tested covariant energy density functionals (CEDFs), namely, DD-PC1, DD-ME2, NL3*, and PC-PK1, representing the major classes of the CDFT models are employed in the present study. Theoretical uncertainties in the ground state deformations and fission barriers and their evolution as a function of proton and neutron numbers have been quantified and their major sources have been identified. Spherical shell closures at $Z=120$, $N=184$, and $N=258$, as well as nuclear matter properties of employed CEDFs, are two major factors contributing to theoretical uncertainties. [Preview Abstract] |
Friday, November 19, 2021 3:15PM - 3:30PM |
M02.00005: Extension of the nuclear landscape beyond spin-zero limits: rotation in extremely proton-rich nuclei". Saja Teeti, Ahmad Taninah, Anatoli Afanasjev Recent investigations reveal a number of physical mechanisms by which it is possible to extend the nuclear landscape beyond spin zero limit. One of these is related to so-called birth of particle-bound rotational bands in neutron-rich nuclei which has been first suggested in Ref.[1]. In this mechanism, strong Coriolis interaction acting on high-$j$ orbitals transforms particle-unbound(resonance) nucleonic configurations into particle-bound ones with increasing angular momentum. A similar mechanism is active also in the nuclei in the vicinity of proton drip line[2] but it is modified the presence of the Coulomb barrier. As a result, particle-unbound part of the band will have discrete rotational states which can decay by proton emission. A systematic investigation of this phenomenon has been performed in proton rich even-even $Z=4-36$ nuclei within the framework of cranked relativistic mean field theory with the goals to find the general features of this phenomenon and the best candidates for experimental observations. One of interesting predictions is a new phenomenon of rotation-induced proton halos which is active in some nucleonic configurations. [1] A. V. Afanasjev, N. Itagaki and D. Ray, Phys. Lett. B 794, 7 (2019) [2] A. V. Afanasjev, S.E. Agbemava and A. T [Preview Abstract] |
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