Bulletin of the American Physical Society
5th Joint Meeting of the APS Division of Nuclear Physics and the Physical Society of Japan
Volume 63, Number 12
Tuesday–Saturday, October 23–27, 2018; Waikoloa, Hawaii
Session 1WAA: Computational Nuclear Structure I |
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Chair: Heiko Hergert, Michigan State University Room: Hilton Kona 4 |
Tuesday, October 23, 2018 9:00AM - 9:30AM |
1WAA.00001: HPC implementation of microscopically constrained energy density functionals Invited Speaker: Rodrigo Navarro Perez While ab-initio many body techniques can successfully describe light and intermediate nuclei based on microscopic interactions, heavy nuclei remain out of reach for these methods. Conversely, mean field approaches can calculate heavy nuclei properties but rely on phenomenological interactions. We present a usable form of the nuclear energy density functional that is rooted in the modern theory of nuclear forces. The first component of this functional is a non-local functional of the density and corresponds to the direct part (Hartree term) of the expectation value of local chiral potentials on a Slater determinant. A second component is a local functional of the density obtained by applying the density matrix expansion to the exchange part (Fock term) of the expectation value of the local chiral potential. We apply an optimization protocol to determine the coupling constants of this functional. We obtain a set of microscopically-constrained functionals for local chiral potentials from LO up to N2LO with and without 3N forces Δ excitations. We present validations of these functionals based on the calculation of nuclear and neutron matter, mass tables, single-particle shell structure in closed-shell nuclei and the fission barrier of 240Pu. |
Tuesday, October 23, 2018 9:30AM - 10:00AM |
1WAA.00002: Large-scale computation of the no-core Monte Carlo shell model for nuclear many-body problems Invited Speaker: Takashi Abe With the aid of recent progress on computational environments and nuclear many-body calculation techniques adapted to large-scale computations on the state-of-art supercomputers, ab-initio approaches for nuclear structure and reactions have greatly advanced and are now providing first principles results for low-energy nuclear theory. As one of these ab-initio methods for nuclear structure, the no-core Monte Carlo shell model (MCSM) has also been developed in recent years, following the successes in the standard MCSM calculations with shell-model effective interactions under the assumption of the inert core and valence space. In this contribution, we will briefly summarize the current status of no-core MCSM calculations. No-core MCSM results in light nuclei with realistic two-nucleon forces, JISP16 and Daejeon16 NN interactions, will be given as one of the demonstrations for the capability of our method. From the current understanding of ab-initio theory, three-nucleon forces (3NFs) are indispensable for ab-initio calculations to reproduce experimental data. Concerning the inclusion of 3NF effects, the no-core MCSM calculations with similarity-renormalization-group-evolved chiral effective-field-theory interactions will be presented so as to investigate the 3NF effects on calculated observables. Our attempts for the understanding of alpha-cluster and molecular-orbital structure in terms of nucleon degrees of freedom will also be mentioned, focusing on the Be and C isotopes. The intrinsic shapes obtained from no-core MCSM wavefunctions without any assumptions of alpha-cluster and molecular-orbital structure are qualitatively consistent with those from the model calculations. |
Tuesday, October 23, 2018 10:00AM - 10:30AM |
1WAA.00003: Neutrinos and Nuclei Invited Speaker: Saori Pastore In this talk, I will present Quantum Monte Carlo calculations of electroweak observables in light nuclei, with emphasis on beta decays, neutrinoless double beta decays, and neutrino scattering off nuclei. |
Tuesday, October 23, 2018 10:30AM - 11:00AM |
1WAA.00004: COFFEE BREAK
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