Bulletin of the American Physical Society
APS April Meeting 2014
Volume 59, Number 5
Saturday–Tuesday, April 5–8, 2014; Savannah, Georgia
Session M7: Few-Body Systems |
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Sponsoring Units: GFB Chair: Ulf-G. Meissner, Bonn University/Juelich Room: 201 |
Sunday, April 6, 2014 3:30PM - 3:42PM |
M7.00001: Parity-violating asymmetry in $\vec{\gamma} d \to np$ Matthias Schindler, Jared Vanasse Ongoing experimental and theoretical efforts try to measure, analyze, and interpret hadronic parity violation in few-nucleon systems, such as the NPDGamma experiment at the Spallation Neutron Source at Oak Ridge National Laboratory. Important information on parity-violating nucleon-nucleon interactions can be gained from an asymmetry in the break-up reaction $\vec{\gamma} d \to np$, which might be measurable at a future high-intensity photon source such as the proposed upgraded HIGS facility. We will discuss recent theoretical calculations of this parity-violating asymmetry based on effective field theory, how they contribute to the planning of the corresponding experiment, and the impact of such a measurement on our understanding of hadronic parity violation. [Preview Abstract] |
Sunday, April 6, 2014 3:42PM - 3:54PM |
M7.00002: Configuration space Faddeev formalism for system of non-identical particles: three-body model for $^6_\Lambda$He Igor Filikhin, Vladimir Suslov, Branislav Vlahovic We study structure of energy spectrum of light hyprnucleus $^6_\Lambda$He using cluster $\alpha$+$\Lambda$+$n$ model. In particular, the spin doublet (1$^-$,2$^-$) of $^6_\Lambda$He is of interest for the testing the spin dependence of hyperon-nucleon potentials. Experimental value for 1$^-$ ground state energy of $^6_\Lambda$He has been reported to be -0.17 MeV below the threshold $^5_\Lambda$He+n. Our study is based on the configuration-space Faddeev equations for a system of three non-identical particles. The analytical continuation method in a coupling constant is applied for calculation of resonance parameters. The results of calculations for low-lying spectra of the system $\alpha$+$\Lambda$+$n$ are presented. Within our model, the $\alpha$-n potential is constructed to reproduce the results of $R$-matrix analysis for $\alpha$-n scattering data. This potential simulates the Pauli exception for $\alpha n$ in the s-state with repulsive core. We use phenomenological $\alpha$-$\Lambda$ potential and for the $\Lambda$-n interaction the s-wave potential simulating model NSC97f. We calculated energies of the low-lying 1$^-$, 2$^-$, 2$^+$, 0$^-$ states. Obtained results are discussed and compared with other calculations (T. Motoba et al. Prog. Theor. Phys. 70, 189 (1983)). [Preview Abstract] |
Sunday, April 6, 2014 3:54PM - 4:06PM |
M7.00003: Quantum Monte Carlo calculations of electromagnetic transitions in low-lying states of $^8$Be Saori Pastore, Robert Wiringa, Rocco Schiavilla, Steven Pieper We present quantum Monte Carlo calculations of electromagnetic transitions in low-lying states of $^8$Be. The Hamiltonian utilized to generate nuclear wave functions includes the Argonne-{\it v}18 two-nucleon and the Illinois-7 three-nucleon interactions. The M1 transition operator accounts for two-body contributions of one- and two-pion range, as well as contact terms, derived from chiral effective field theory. We find that two-body corrections are significant and always bring the theory in a better agreement with the experimental data. We also present E2 transition calculations, evaluated in impulse approximation, with emphasis on transitions involving the resonant excited states at $\sim 3$ MeV and $\sim 11$ MeV. [Preview Abstract] |
Sunday, April 6, 2014 4:06PM - 4:18PM |
M7.00004: Study of few body Kaonic Nuclei using the method of hyperspherical functions in momentum representation Roman Kezerashvili, Shalva Tsiklauri Kaonic three-body K$^-$ NN, and of four-body K$^-$NNN and K$^-$K$^-$NN nuclei are studied within the method of hyperspherical functions in momentum representation, using realistic local and separable potential models for NN and KN as well as for KK interactions. We solve nonrelativistic three- and four-body Schrodinger equation in momentum representation in the framework of the method of hyperspherical harmonics to find a ground state binding energy and corresponding wave function. The following ground-state binding energies were obtained: 48.3 MeV (K$^-$pp), 28.2 MeV (K$^-$K$^-$p), 67.2 MeV (K$^-$ppn), and 89.3 MeV (K$^-$K$^-$pp), which are in good agreement with previous results obtained for the same potentials using Faddeev equations and variational method. There are theoretical discrepancies relating to the binding energy of kaonic nuclei, coming from the different KN and KK interactions. Using AV4 NN (Wiringa, Pieper, Phys. Rev. Lett. 89, 182501, 2002) potential and energy dependent chiral KN and KK local potentials (Barnea et al, Phys. Lett. B 712, 132, 2012) we received the following results of the binding energies 13.9 Mev (KNN) $_{\mathrm{\raise.5ex\hbox{$\scriptstyle 1$}\kern-.1em/ \kern-.15em\lower.25ex\hbox{$\scriptstyle 2$} ,0}}$, 27.3 Mev (K NNN)$_{\mathrm{I=0}}$ and 30.4 MeV ( K$^-$KNN ) $_{\mathrm{I=0}}$ . The results of our calculations are in agreement with results of Barnea et al. The experimental evidences to support theoretical predictions are discussed. This research is supported by CUNY Research Grant Program C$^3$IRG . [Preview Abstract] |
Sunday, April 6, 2014 4:18PM - 4:30PM |
M7.00005: The Wigner effect for three interacting bosonic dipoles in a harmonic trap Shalva Tsiklauri, Joseph Ganser Three indirect bosonic dipoles are treated using the hyperspherical function method, providing numerical confirmation that the Wigner crystallization effect persists for strong confinement. Our results show that the Wigner features become universal, with a known dipole -dipole parameter and also, the dipolar interaction is extremely valuable for the study of Wigner state. This research is supported by Research PSC- CUNY Grant: award {\#} 66373-00-44. [Preview Abstract] |
Sunday, April 6, 2014 4:30PM - 4:42PM |
M7.00006: Protons Are Spinning On regular Orbits And Neutrons Have Different Binding Energies Inside Atoms Niazi Elfikky Preface. With the centennial of the discovery of the atomic nucleus by the Chemist, Professor Ernest Rutherford (1871-1937), it is worthwhile to memorize such occasion. For the structure of the atom where he had postulated that atoms have their positive charge concentrated in a very small nucleus. It was a great breakthrough when he introduced his imagination for the structure of the atom. Furthermore, he proposed a dynamic planetary model in which the nucleus plays the role of the sun and electrons correspond to the individual planets of the solar system although he fixed the atom's nucleus of the solar system, (He resembled the nucleus of the atom with the sun although he had dropped an essential fact that the sun is also rotating in its specific orbit surrounded by the outer orbit for the rotating planets like the whirling electrons. For studying the stable atom of the steady state elements like hydrogen 1H1, the particles of the 1H1 atoms are simle just one proton 1p1 and one electron 0e1, both the proton and electron have equal electric charge (q= 1.6x10-19 Coulomb) but in different sign (positive charge for proton and negative for electron), also they have different masses (mp= 1.67x10-27Kg, me= 9.11x10-31kg), proton is heavier than electron by 1.834x103. What does it mean? [Preview Abstract] |
Sunday, April 6, 2014 4:42PM - 4:54PM |
M7.00007: Nuclear Axial Currents in Chiral Effective Field Theory Alessandro Baroni We present a progress report on the derivation of the nuclear axial current in time-ordered perturbation theory within a chiral-effective-field-theory framework with pions and nucleons as explicit degrees of freedom. The calculation has been carried out up to one loop by including one- pion-exchange, two-pion-exchange and contact terms. Nonstatic corrections to the axial current are included. Dimensional regularization has been used to renormalize pion-loop corrections. [Preview Abstract] |
Sunday, April 6, 2014 4:54PM - 5:06PM |
M7.00008: Strangeness in the proton Mary Alberg Both perturbative and non-perturbative mechanisms contribute to strangeness in the proton sea. We have developed a hybrid model in which non-perturbative contributions are calculated in a meson cloud model which expands the proton in terms of meson-baryon states, and perturbative contributions are calculated in a statistical model which expands the proton in terms of quark-gluon states. The perturbative contributions are represented in the parton distributions of the ``bare'' hadrons in the meson cloud. We compare our results to the recent experimental data of ATLAS and HERMES. [Preview Abstract] |
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