Bulletin of the American Physical Society
2014 Annual Meeting of the Far West Section of the APS
Volume 59, Number 14
Friday–Saturday, October 24–25, 2014; Reno, Nevada
Session H4: Nuclear Physics |
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Chair: Ken Ganezer, California State University, Dominguez Hills Room: JCSU 323 |
Saturday, October 25, 2014 2:00PM - 2:12PM |
H4.00001: An Estimate for the Systematic Uncertainty Associated with the Polarization of the Upsilon Meson at CMS Brandon McKinzie An estimate for the systematic uncertainty associated with the polarization of the Upsilon meson is presented for the LHC heavy-ion collision energy of $\sqrt{s_{NN}}$ = 2.76 TeV. Kinematic cuts are applied to simulated collision data in order to model the acceptance of the CMS detector. The systematic uncertainty is then plotted as a function of $\Upsilon$ $p_T$ for both high- and low-acceptance polarization cases. We find that Upsilon acceptance varies as a function of p$_T$, with, when no kinematic cuts are applied, as high as a twelve-percent difference between levels of polarization (at low $p_T$) and, when kinematic cuts are applied, as high as a four-percent difference (at mid p$_T$). [Preview Abstract] |
Saturday, October 25, 2014 2:12PM - 2:24PM |
H4.00002: Z+Jet Simulations In p+p and Pb+Pb Collisions at the LHC Joshua Gearhart Z+jet measurements provide a relatively clean probe for energy loss in the QGP, but this process has an extremely low cross section. The statistics of this measurement will benefit greatly from the increased energy of the LHC following the recent shutdown allowing us to make a reliable measurement of this process. We can get an idea of what sort of a signal to expect by using the jet quenching event generator PYQUEN to create the Z+jet event along with the heavy ion event generator HYDJET to create a full heavy ion collision background. We can then use the jet finding software FastJet to compare the kinematics of the jet to that of its partner Z boson since their transverse momenta should be correlated to leading order. These simulations can then be compared to the upcoming Pb+Pb data as well as the recently acquired p+Pb data. [Preview Abstract] |
Saturday, October 25, 2014 2:24PM - 2:36PM |
H4.00003: Performance of a Newly Installed Muon Telescope Detector in the STAR Experiment at RHIC Kathryn Meehan The Muon Telescope Detector (MTD) has recently been installed into the STAR experiment at the Relativistic Heavy Ion Collider (RHIC). Heavy ion collisions allow us to create quark gluon plasma (QGP) in the laboratory and to study strong interactions. The new detector enables STAR to detect muons from quarkonia decays. This opens a new, cleaner channel to study particles that give an insight into thermodynamic properties of the QGP. The MTD will allow us to measure quarkonia production at RHIC with unprecedented precision. Performance plots of the MTD in the 2014 run will be shown. [Preview Abstract] |
Saturday, October 25, 2014 2:36PM - 2:48PM |
H4.00004: Final Construction Phase of the CLAS12 High-Threshold Cerenkov Counter Shane Miller-Smith, John Price The CLAS detector at the Thomas Jefferson National Accelerator Facility in Newport News, VA (JLab) is currently undergoing an upgrade. A significant part of the particle-identification system for this detector is the \v{C}erenkov counter, used to distinguish electrons from other particles in the detector. At the energies that will be available upon completion of the upgrade, the existing \v{C}erenkov counter will be insufficient. To alleviate this situation, a new, high-threshold \v{C}erenkov counter (HTCC) is being built. This new detector will utilize a mirror assembly to direct the \v{C}erenkov photons into a region of the detector with a low magnetic field. The construction of the mirror assembly required a clean-room environment that approximated the actual laboratory conditions as closely as possible to prevent mirror warping after installation. The clean-room environment, which was built specifically for this purpose, had to be continuously monitored for temperature, humidity, and particle count. The mirror assembly was prepared by attaching previously fabricated and tested mirror segments to a center ring in such a way that the entire structure was self-supporting and rigid, while minimizing the amount of material used in its construction. Because the transport of the finished detector into the laboratory is expected to apply stresses to the mirrors, a half-sector assembly was constructed to test the effects of this transport. Additionally, a significant effort was spent in the preparation and installation of the shields for the photomultiplier tubes used to detect the \v{C}erenkov photons. This talk will discuss the final stages of the assembly and construction of the HTCC, and will show the present status of the detector. [Preview Abstract] |
Saturday, October 25, 2014 2:48PM - 3:00PM |
H4.00005: Application of the Extended Pairing Model to Heavy Isotopes Vesselin Gueorguiev, Feng Pan, Jerry Draayer Relative binding energies (RBEs) within three isotopic chains ($^{100-130}$Sn, $^{152-181}$Yb, and $^{181-202}$Pb) have been studied using the exactly solvable extended pairing model (EPM) [Phys. Rev. Lett. 92 (2004) 112503]. The unique pairing strength G, which reproduces the experimental RBEs, has been determined. Within EPM, log(G) is a smooth function of the model space dimension dim(A), as expected for an effective coupling strength. In particular, for the Pb and Sn isotopes G can be described by a two parameter expression that is inversely proportional to the dimensionality of the model space, G $= \alpha $ dim(A)$^{-\beta}$ with $\beta \approx $1. PACS Classification: 21.10.Dr Binding energies, 71.10.Li Pairing interactions in model systems, and 21.60.Cs Shell model. [Preview Abstract] |
Saturday, October 25, 2014 3:00PM - 3:12PM |
H4.00006: Matrix continued fractions for the Feshbach-Villars equations Natalie Brown, Zoltan Papp, Robert Woodhouse Relativistic spin-zero particles are mostly described by the Klein-Gordon equation. However, there exists an equivalent, little known, formulation, the Feshbach-Villars formalism. In the Feshbach-Villars formalism, the Klein-Gordon wave function is broken into two components such that the equations appear in a Hamiltonian form with first order time and second order spatial derivatives. The aim of this work is to develop a solution method for the Coulomb plus short-range potential problems. We write the Feshbach-Villars equations in a Lippmann-Schwinger form and we calculate the corresponding Coulomb-Green's operator in a Coulomb-Sturmian basis representation by a matrix continued fraction. We illustrate the efficiency of the method by calculating the eigenstates of an attractive Coulomb plus Yukawa potential. [Preview Abstract] |
Saturday, October 25, 2014 3:12PM - 3:24PM |
H4.00007: Laser Forced Nuclear Fission Richard Kriske Although it is well known that Lasers of the right wavelength can produce Nuclear Fusion and they can also be used in the Nuclear Fission enrichment process, it is not as well known that it may be possible to Force non fissile quantities of Uranium and Plutonium as well as Nuclear waste products to go into a state of Nuclear Fission. A Laser beam (perhaps a FEL beam) could potentially produce a short enough wavelength in the Hard X-ray spectrum or perhaps into the Gamma Ray spectrum and knock Neutrons out of the Nucleus and through constant application of the Laser beam force a small quantity into Nuclear Fission. The uses of this application would not be just to destroy Nuclear warheads in flight, more importantly it could be used to drastically reduce the quantity of Nuclear waste, by converting the Stored Energy of those Nuclei into Heat for generation of Electricity, and producing isotopes with drastically shorter half-lives. The half lives could be reduced from thousands of years to around one hundred years. This sort of Fission could be used to make weapons with lower yield from smaller amounts of material and it could also be used to make Nuclear weapons less viable, since they contain so much Potential Energy that a Laser could release from a long distance. [Preview Abstract] |
Saturday, October 25, 2014 3:24PM - 3:36PM |
H4.00008: Nobel Prize in Physics 1921 Was Awarded to Albert Einstein for a Wrong Law! Ahmad Reza Estakhr The nobel prize in physics 1921 was awarded to Albert Einstein for wrong law of Photoelectric effect. According to Einstein's theoretical explanation, emission of electron is not possible for frequency less than thershold one, But I noted that Einstein's explanation is inconsistent with well established effect of Quantum tunnelling, for this reason I reformulate photoelectric effect and then discovered the correct law of photoelectric effect $\hat E\Psi= \hat H_e\Psi$ where the $\hat H_e $ is electron hamiltonian operator. Relativistic version (or Estakhr-Schr\"odinger equation): $-\frac {\hbar^2\nabla^2\Psi}{(1+ \gamma)m_e}+W\Psi=\hat{E}\Psi $, Non-Relativistic version (or Schr\"odinger equation): $\frac {- \hbar^2\nabla^2\Psi}{2m_e}+W \Psi=\hat E\Psi$, my law of photoelectric effect is consistent with quantum tunnelling. (infact classical limit of my law of photoelectric effect is Einstein's law of the photoelectric effect.) [Preview Abstract] |
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