Bulletin of the American Physical Society
2008 Annual Meeting of the Division of Nuclear Physics
Volume 53, Number 12
Thursday–Sunday, October 23–26, 2008; Oakland, California
Session LB: Nuclear Theory: Fundamental Issues |
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Chair: Francesca Sammarruca, University of Idaho Room: Room 208 |
Sunday, October 26, 2008 8:30AM - 8:42AM |
LB.00001: What can cold atomic gases teach us about nuclear structure? Calvin Johnson, Plamen Krastev, Joshua Staker Cold atomic gases have become a new frontier for applying many-body techniques. We look at computing the ground state of a trapped gas of fermionic atoms using configuration-interaction shell-model methods, with attention paid to convergence. Most notably we consider gases with infinite scattering length and with zero- and finite-ranges, and discuss what lessons nuclear structure theorists can take home. [Preview Abstract] |
Sunday, October 26, 2008 8:42AM - 8:54AM |
LB.00002: The energy spectrum of three protons trap systems Shalva Tsiklauri, Roman Kezerashvili This paper consider possibility that three proton may bind in uniform strong magnetic field. We have used hyperspherical functions method for solution of the relative part Hamiltonian of three protons confined in the presence of an applied uniform magnetic field. The spin singlet-triplet transition in the ground state of the three protons is shown. We have also displayed the singlet-triplet energy gap, $\Delta $ = E$_{T}$ -- E$_{S}$, against the strength of the magnetic field. [Preview Abstract] |
Sunday, October 26, 2008 8:54AM - 9:06AM |
LB.00003: Amplification of weak interaction by coherent effects in the nucleus Vladimir Zelevinsky, Naftali Auerbach, Alexander Volya Strong interactions between the nucleons in complex nuclei can considerably amplify the effects of weak perturbations. The parity non-conservation in experiments with slow polarized neutrons (scattering and fission) is enhanced by orders of magnitude as a result of high density of neutron resonances and uniformly chaotic nature of compound wave functions. The search for the electric dipole moments (EDM) of atoms is currently performed by several experimental groups. Here one needs a coherent enhancement of simultaneous parity and time-reversal violation in the ground state. The atomic EDM is induced by the nuclear Schiff moment. We discuss possible mechanisms of the enhancement of the Schiff moments by the coherent interaction of quadrupole and octupole degrees of freedom in deformed nuclei and in soft spherical nuclei. [Preview Abstract] |
Sunday, October 26, 2008 9:06AM - 9:18AM |
LB.00004: Nuclear Electric Dipole Moment of $^3$He I. Stetcu, C.-P. Liu, J. Friar, A. Hayes, P. Navratil A permanent electric dipole moment (EDM) of a physical system requires time-reversal (T) and parity (P) violation. Experimental programs are currently pushing the limits on EDMs in atoms, nuclei, and the neutron to regimes of fundamental theoretical interest. Here we calculate the magnitude of the PT-violating EDM of 3He and the expected sensitivity of such a measurement to the underlying PT-violating interactions. Assuming that the coupling constants are of comparable magnitude for pi-, rho-, and omega-exchanges, we find that the pion-exchange contribution dominates. Our results suggest that a measurement of the 3He EDM is complementary to the planned neutron and deuteron experiments, and could provide a powerful constraint for the theoretical models of the pion-nucleon PT-violating interaction. [Preview Abstract] |
Sunday, October 26, 2008 9:18AM - 9:30AM |
LB.00005: Calculation of Observables using the SRG Flow Equations E.R. Anderson, S.K. Bogner, R.J. Furnstahl, E.D. Jurgenson, R.J. Perry The Similarity Renormalization Group (SRG) flow equations are a series of unitary transformations which can be used to to achieve different patterns of decoupling in a Hamiltonian. An SRG transformation applied to nucleon-nucleon interactions leads to greatly improved convergence properties while preserving observables. Not only does it provide a method to consistently evolve many-body potentials, but also other operators.\footnote {S.K. Bogner, R.J. Furnstahl, and R.J. Perry, Phys. Rev. C 75 (2007) 061001.} Here, the flow equations are applied to model and realistic nuclear Hamiltonians to calculate various observables (via the Stochastic Variational Method). Analytic properties of the corresponding operators are explored as well as properties of the general unitary transformation applied to these operators. [Preview Abstract] |
Sunday, October 26, 2008 9:30AM - 9:42AM |
LB.00006: Similarity Renormalization Group with Three-Body Forces in One-Dimensional Models Eric Jurgenson, Richard Furnstahl Similarity Renormalization Group (SRG) flow equations have been applied to nucleon-nucleon interactions, resulting in band-diagonalized Hamiltonians. This decouples high- and low-energy states, which greatly simplifies many-body calculations. Further progress requires a consistent application of the SRG to at least three-nucleon interactions. In this talk we present model calculations in one dimension including the evolution of three and four body forces with the SRG flow equations. We perform our calculations with several different approaches in anticipation of the three-dimensional generalization. [Preview Abstract] |
Sunday, October 26, 2008 9:42AM - 9:54AM |
LB.00007: Law of Matter Creation and Motion Stewart Brekke All matter is in a state of no motion, linear, rotational and/or vibratory motion. Therefore, matter, when created, will have no motion, linear, rotational and/or vibratory motion singly and/or in some combination. Curvilinear motion such as orbital motion is linear motion in an external force field.If $1/2I\omega^2$ is the energy of rotation and k is a constant of vibration and x the amplitude of vibration, he equation for this law of matter creation and creation of energy of motion is $\ hf = 2m_0c^2 + 1/2m_+v^2 + 1/2m_-v^2 + 1/2I\omega^2_{r_+} + 1/2I\omega^2_{r_-} + 1/2k_1x_+^2 +1/2k_2x_-^2$ [Preview Abstract] |
Sunday, October 26, 2008 9:54AM - 10:06AM |
LB.00008: The Brightsen Nucleon Cluster Model Predicts Unmatter Entities inside Nuclei Dmitri Rabounski, Florentin Smarandache The basis that ``unmatter'' (the conjugations of matter and antimatter) does exists comes from the 1970's experiments done at Brookhaven and CERN (Phys. Rev. Lett., 1971, v.26, 1491; 1974, v.32, 247; 1974, v.33, 1635; Phys.-Usp., 1973, v.109, 431; Ann. Phys., 1974, v.84, 261), where unstable unmatter-like entities were found. The term ``unmatter'' was first introduced by Smarandache in 2004 (CERN CDS EXT-2004-142), and then in (Prog. Phys., 2005, v.1, 9; 2005, v.2, 113). Applying the Brightsen Nucleon Cluster Model of the atomic nucleus we claim that unmatter entities may be formed as clusters inside a nucleus. This model supports an idea that antimatter nucleon clusters are present as a parton superposition within the spatial confinement of the proton (1H1), the neutron, and the deuteron (1H2). If model predictions can be confirmed in experiment, a new physics is suggested, opening a way to expand the Standard Model. [Preview Abstract] |
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