Bulletin of the American Physical Society
Joint Meeting of the Four Corners and Texas Sections of the American Physical Society
Volume 61, Number 15
Friday–Saturday, October 21–22, 2016; Las Cruces, New Mexico
Session C3: Nuclear Physics |
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Chair: Jorge Lopez, University of Texas, El Paso Room: Meeting Room 2&3 |
Friday, October 21, 2016 1:00PM - 1:12PM |
C3.00001: Triangular exchange amplitude with off-shell Coulomb T matrix for deuteron induced reactions Hao Viet Nhan Tran, A. M. Mukhamedzhanov, C. A. Bertulani, Shubhchintak FNU The amplitude of the triangular diagram in the three-body models of exchange reactions with charged particles contains the off-shell two-body $T$ matrix describing the intermediate-state Coulomb scattering of charged subsystems. Up to now the latter has usually been replaced by the Coulomb potential due to the computational reason. In this work, we first investigate theoretically and numerically the behavior of the exact exchange triangle amplitudes for nuclear reactions off heavy target. [Preview Abstract] |
Friday, October 21, 2016 1:12PM - 1:24PM |
C3.00002: Photon angular distribution and radiative capture cross section of $^{\mathrm{2}}$H($\alpha $, $\gamma )^{\mathrm{6}}$Li reaction Shubhchintak ., A. M. Mukhamedzhanov, C. A. Bertulani, T. V. Nhan Hao In the area of nuclear astrophysics, the lithium problem is one of the long standing puzzles and is a hot topic in modern cosmology. It originates from the disagreement of the observed abundance of [$^{\mathrm{7}}$Li/H] and the isotopic ratio [$^{\mathrm{6}}$Li/$^{\mathrm{7}}$Li] in stars to those predicted by the Big Bang Nucleosynthesis model. These two problems are respectively named as first and second lithium puzzle. Given that the yield of the observed and the predicted primordial $^{\mathrm{7}}$Li are quite well established, the second lithium puzzle needs accurate determination of $^{\mathrm{6}}$Li abundance which further can be determined from the $^{\mathrm{2}}$H($\alpha $, $\gamma )^{\mathrm{6}}$Li reaction if the observed $^{\mathrm{6}}$Li is primordial. After a number of unsuccessful attempts, recently the LUNA collaboration presented the first successful measurement of $^{\mathrm{2}}$H($\alpha $, $\gamma )^{\mathrm{6}}$Li reaction at two different Big Bang energies (94 and 134 keV). In this context we present our calculations of the photon angular distribution and cross section for the $^{\mathrm{2}}$H($\alpha $, $\gamma )^{\mathrm{6}}$Li using a potential model. Our calculations provide the best kinematics conditions for the $^{\mathrm{2}}$H($\alpha $, $\gamma )^{\mathrm{6}}$Li reaction and can improve the accuracy of future experiments. [Preview Abstract] |
Friday, October 21, 2016 1:24PM - 1:36PM |
C3.00003: Characterization of Nuclear Fuels by Energy-Resolved Neutron Imaging and Neutron Diffraction Adrian Losko, Sven Vogel, Anton Tremsin, Mark Bourke, Stewart Voit, Ken McClellan, Heinz Nakotte The unique advantages of neutrons for characterization of nuclear fuel materials are applied to accelerate the development and ultimately licensing of new nuclear fuel forms. Energy-resolved neutron imaging and tomography allows visualizing cracks, arrangement of fuel pellets in rodlets etc., but also characterization of isotope or element densities by means of neutron absorption resonance analysis. Complementary diffraction measurements allow characterization of the crystallography of phases consisting of heavy elements (e.g. uranium) and light elements (e.g. oxygen, nitrogen, or silicon). The penetration ability in combination with comparably large (e.g. cm sized) beam spots provide microstructural characterization of typical fuel geometries for phase composition, strains, and textures from neutron diffraction. In this presentation, we provide an overview of our recent accomplishments in fuel characterization for accident-tolerant fuels consisting of uranium nitride/uranium silicide composite fuels. [Preview Abstract] |
Friday, October 21, 2016 1:36PM - 1:48PM |
C3.00004: Quark Distributions and Nuclear Binding Waverly Gorman We consider a 1$+$1 dimensional model for nuclei where the `nucleons' are represented by a heavy-light system. This allows for the study of binding energies and quark distributions as a function of the separation between the nucleons. We find a significant shift of quark distributions towards smaller momentum. [Preview Abstract] |
Friday, October 21, 2016 1:48PM - 2:00PM |
C3.00005: Two-Body Resonances with Effective Field Theory Jaber Balalhabashi, Sean Fleming, Srimoyee Sen, Ubirajara van Kolck Resonance states are of particular importance for the scattering of two particles in quantum mechanics. In this talk we \cite{ref1} build an effective field theory (EFT) description for scattering around a low-energy two-body resonance, by taking into account the subtleties of power counting for these states in an effective-range expansion (ERE). We demonstrate that a careful choice of leading order and next-to-leading order terms in an effective Lagrangian can give rise to a systematic ERE around a resonance, with controlled error estimates. We demonstrate the application of the EFT developed here by comparing phase shifts and pole positions with those of a toy model. The formalism developed in this presentation is relevant to narrow low-lying Feshbach resonances in cold atoms; our goal is to eventually describe nuclear resonances in the scattering of alpha particles.\\ \\$[1]$J.~Balalhabashi, S.~Fleming, S.~Sen and U.~van~Kolck, \lq\lq Two-Body Resonances with Effective Field Theory\rq\rq, in preparation. [Preview Abstract] |
Friday, October 21, 2016 2:00PM - 2:12PM |
C3.00006: Coulomb breakup of proton rich exotic nuclei Ravinder Kumar, Angela Bonaccorso, Carlos Bertulani We have studied the single proton breakup from weakly bound 8B and 17F exotic nuclei due to Coulomb reaction mechanisms in light and heavy target cases. The role of recoil effect of the core-target Coulomb potential and direct proton-target Coulomb potential has been studied exclusively. We have calculated the breakup cross section and parallel momentum distribution (LMD) for 8B and 17F projectiles on a light and a heavy target in a medium beam energy range (40A--80A MeV). The calculation of the direct and recoil Coulomb effects separately and of their interference is the new aspect of this work. [Preview Abstract] |
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