Bulletin of the American Physical Society
85th Annual Meeting of the APS Southeastern Section
Volume 63, Number 19
Thursday–Saturday, November 8–10, 2018; Holiday Inn at World’s Fair Park, Knoxville, Tennessee
Session D02: Nuclear Physics I |
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Chair: Miguel Madurga, University of Tennessee Room: Holiday Inn Knoxville Downtown Cumberland |
Thursday, November 8, 2018 4:30PM - 4:42PM |
D02.00001: Quantum computing of atomic nuclei Thomas Papenbrock Quantum computers promise to solve “exponentially hard” problems, such as computing the structure of molecules, atoms, or atomic nuclei. This talk presents the first quantum computation of the deuteron, the lightest atomic nucleus, using publicly available software and accessing quantum processors via the cloud. The calculation employed as simple-yet-realistic model for the deuteron and tailored the calculation to the constraints imposed by cloud computing on noisy quantum chips. The quantum computation yielded the deuteron’s binding energy to within a few percent of precision. |
Thursday, November 8, 2018 4:42PM - 4:54PM |
D02.00002: A solution to the puzzle of quenched beta-decays. Gaute Hagen For over 50 years, a central puzzle has been that observed β-decay rates are systematically smaller than theoretical predictions. This was attributed to an apparent quenching of the fundamental coupling constant gA in the nucleus by a factor of about 0.75 compared to the β-decay of a free neutron. The origin of this quenching is controversial and has so far eluded a first-principles theoretical understanding. This talk presents a solution to this puzzle, and shows that this quenching can be explained from two-body currents and many-body correlations. Using interactions and currents from chiral effective field theory that describe Gamow-Teller strength in light nuclei well, I will present first principles computations of Gamow-Teller strength in selected medium mass and the heavy nucleus 100Sn. Our results are consistent with experimental data, including the pioneering measurement for 100Sn [1,2]. These theoretical advances have been enabled by systematic effective field theories of the strong and weak interactions combined with powerful quantum many-body techniques and ever increasing computational power.
[1] Hinke, C. B. et al., Nature 486, 341-345 (2012). [2] Batist, L. et al. Eur. Phys. J. A 46, 45-53 (2010). |
Thursday, November 8, 2018 4:54PM - 5:06PM |
D02.00003: Shell model coupled cluster calculation Zhonghazo Sun, Thomas F Papenbrock, Gaute Hagen, Gustav R. Jansen, Titus D. Morris We present the shell model coupled-cluster calculation of open-shell nuclei. The coupled-cluster method decoupled the reference state. A secondary similarity transformation is applied to the Coupled-cluster effective Hamiltonian to get the valance and excluded space decoupled, which lead to a shell model interaction and is capable to deal with arbitrary number of valance particles. We show that the three-body terms induced by both similarity transformations are crucial for an accurate computation of ground and excited states. |
Thursday, November 8, 2018 5:06PM - 5:18PM |
D02.00004: Pion-less Effective Field Theory for atomic nuclei and lattice nuclei Aaina Bansal, Andreas Ekström, Sven Binder, Gaute Hagen, Gustav R. Jansen, Thomas F Papenbrock We compute the medium-mass nuclei $^{16}$O and $^{40}$Ca using pionless effective field theory (EFT) at next-to-leading order (NLO). The low-energy coefficients of the EFT Hamiltonian are adjusted to experimantal data for nuclei with mass numbers $A=2$ and $3$, or alternatively to results from lattice quantum chromodynamics (QCD) at an unphysical pion mass of 806~MeV. The EFT interaction is tailored to finite basis through discrete variable representation in harmonic oscillator basis. This approach ensures rapid convergence with respect to the size of the model space and facilitates the computation of medium-mass nuclei. At NLO the nuclei $^{16}$O and $^{40}$Ca are bound with respect to decay into alpha particles. Binding energies per nucleon are $9-10$~MeV and $21-40$~MeV at pion masses of 140~MeV and 806~MeV, respectively. |
Thursday, November 8, 2018 5:18PM - 5:30PM |
D02.00005: Identification of β and γ vibrational bands in 102Mo Enhong Wang, Joeseph Hamilton, Gowhar Bhat, Sheikh Jehangir, Javid Sheikh, Akunuri V Ramayya, Christopher J Zachary, Jonathan M Eldridge, Brooks Musangu, Yixiao Luo, John Rasmussen, Shengjiang Zhu, Gurgen Ter-Akopian, Yuri Oganessian The transitional nucleus 102Mo has been investigated by the γ-γ-γ and γ-γ-γ-γ high statistics coincidence data obtained from the 252Cf spontaneous fission experiment at Gammasphere. A total of 55 new transitions and 24 new levels has been identified. The 1β, 1γ, 2γ vibrational bands have been established. Good systematics can be seen with the 2γ vibrational bands in neighboring 103-108Mo. Four of the new negative parity bands in 102Mo can form a chiral-like structure similar to the chiral doublet bands in 104,106Mo. |
Thursday, November 8, 2018 5:30PM - 5:42PM |
D02.00006: Radioactive Beta-Decay of 133 Indium for Nuclear Structure Studies Corey R Halverson, Miguel Madurga Flores, Thomas T King The rapid neutron capture (r-) process final yields are determined by waiting point nuclei where neutron-capture and photo-disintegration are in equilibrium. The decay properties of these nuclei, half-lives and neutron branching ratios determine the path out of these waiting points. In this work we study the nuclear structure of 133Sn populated in the beta-decay of 133In. Indium 133 was created in induced fission of 238U at the ISOLDE facility CERN. Its delayed gamma and neutron emission was observed at the Isolde Decay Station. Preliminary results of gamma and neutron emission from unbound states in 133Sn will be presented. |
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