Bulletin of the American Physical Society
2009 Spring Meeting of the Texas Sections of the APS, AAPT, and SPS
Volume 54, Number 2
Thursday–Saturday, April 2–4, 2009; Stephenville, Texas
Session M2: APS3 |
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Chair: Jimmy McCoy, Tarleton State University Room: Science Building 110 |
Saturday, April 4, 2009 10:00AM - 10:12AM |
M2.00001: Electrostatic Confinement of Charged Particle Beams Jose Pacheco, Duncan Weathers, Carlos Ordonez Many experiments rely on the confinement of charged particles. Examples of these experiments range from fusion studies to antiproton-positron studies for antihydrogen production. Researchers have already developed a variety of techniques for controlling and trapping charged particles. Examples of systems devised for such purposes include electrostatic traps in the form of a cavity [1],[2] or in the form of a storage ring like ELISA [3]. For this project, we are pursuing a different approach [4], which relies on a purely electrostatic environment for ion confinement. This system consists of a periodic electrode configuration of cylindrical symmetry that acts to confine an ion beam in the radial direction. In this manner, it is expected that long particle lifetimes inside the trap will be achieved, and that the system will have an inherent scalability to different ion energy. Results obtained from simulation of the proposed system will be presented and discussed along with a brief overview of the steps taken to develop a laboratory prototype. [1] M. Dahan et al., Rev. Sci. Instr. 69 (1998) 76. [2] H. F. Krause et al., American Institute of Physics. CAARI 16$^{th}$ Int'l Conf. (2001). [3] S.P. Moller et al., Proc. of the 1997 Particle Accelerator Conference. vol 1. pp 1027-1029. Vancouver, Canada. May 1997. [4] J.R. Correa et al., Nucl. Instr. and Meth. In Phys. Res. B 241 (2005) 909-912. [Preview Abstract] |
Saturday, April 4, 2009 10:12AM - 10:24AM |
M2.00002: Examination of Some Interesting Data on Global Warming James Roberts, Jai Dahiya, Aman Anand It has been known for some time that the earth is in a cycle of global warming. It is not the intention of this paper to participate in the argument about global warming and the increase of carbon dioxide CO2 in the atmosphere. The goal of this work is to demonstrate how data analysis using such sophisticated calculation methods and devices that we have today can enable us to make predictions and to analyze trends in data. From the data we can see the trends and make scientific predictions about what is taking place by using the scientific method and not relying on popular opinion. Several signatures of data are available for analysis on the climate of the earth. These come from tree ring growth in old trees, sedimentary deposit core samples in the ocean bed, pollen analysis in ice core samples taken from the Arctic and Antarctic area, etc. Evidences are available for the history of the temperature changes in the Sargasso Sea over a period of 1000 years b. c. to 2000 years a. d. These numbers show interesting patterns which can be correlated with events in recorded history. [Preview Abstract] |
Saturday, April 4, 2009 10:24AM - 10:36AM |
M2.00003: Need and prospects for new experiments in baryon spectroscopy using meson beams Sadler Michael The masses, widths, pole positions, and inelasticities of N* and $\Delta $* resonances, the excited states of the nucleon, are compiled by the Particle Data Group (PDG). These parameters have been determined almost exclusively from partial-wave analyses of $\pi $N total, elastic, and charge-exchange scattering data. The determinations come mostly from the Karlsruhe-Helsinki and Carnegie-Mellon-Berkeley analyses that incorporated data sets that are more than 30 years old. The frequently updated GWU analysis has supposedly been used by the PDG since 2006, but the tabulated values for these parameters have not changed. Relativistic quark models accommodate most of these states, but also predict many more. These so-called ``missing states'' supposedly couple weakly to the $\pi $N channel, giving rise to intense efforts at electron accelerators to study these resonances via photo- or electro-production. However, accurate $\pi $N analyses are still needed because the observed particles are the result of hadronic decay. The need for a rejuvenated program in $\pi $N and KN scattering will be presented and possible facilities for doing the experiments will be discussed. [Preview Abstract] |
Saturday, April 4, 2009 10:36AM - 10:48AM |
M2.00004: Shell Model Structure of the Even Isotopes of Argon Shadow Robinson, Larry Zamick, Yitzhak Sharon We perform 0 $\hbar \omega$ model space calculations in the sdpf model space for isotopes of Argon ranging in mass from 38 to 46. These calculations are performed with both the older WBT interaction and the newer SDPF interaction. The results are similar for the lower mass isotopes but diverge as the neutrons approach the N=28 magic number. We draw particular attention to the differing g factors of the 2$^+_1$ state in $^{46}$Ar. Additionally, single j shell symmetries in the $^{40,44}$Ar isotopes are pointed out. [Preview Abstract] |
Saturday, April 4, 2009 10:48AM - 11:00AM |
M2.00005: Raman and Infrared Absorption Study of Indigoid-based Pigments Felicia Manciu, William Durrer, Layra Reza, Alejandra Ramirez, Russell Chianelli A fascinating aspect of \textit{Maya pigments} is that despite the environmentally harsh humidity and high temperatures they resist fading and they have unprecedented stability. In this investigation, we address the question of how organic dye binds to inorganic palygorskite to form pigments. Our analysis by Raman and infrared absorption spectroscopies proves that different processes are taking place for the indigo-palygorskite system as compared with the thioindigo-palygorskite complex. While partial elimination of the selection rules for the centrosymmetric indigo and disappearance of the indigo N-H bonding, with conversion to dehydroindigo, is observed for the first compound, the latter shows no evident structure modification. The interaction between indigo and palygorskite is likely through oxygen and nitrogen. Only oxygen plays this role for the thioindigo-palygorskite complex. [Preview Abstract] |
Saturday, April 4, 2009 11:00AM - 11:12AM |
M2.00006: Comparison of passive safety and the safety injection systems under loss of coolant accident M. Tahir, I.R. Chughtai, M.A.K. Lodhi A Passive Safety Injection System (PSIS) and a Safety Injection System (SIS) with reference to a typical pressurized water reactor have been studied. The performance of the PSIS has been analyzed for a large break Loss of Coolant Accident (LOCA) in one of the cold leg of reactor coolant system. The SIS is a huge system consisting of many active components needing electrical power to perform its role of core cooling as high head safety injection system under designed accidents. The PSIS consist of passive components and performs its function automatically under gravity. In a reactor transient simulation, the PSIS and the SIS are tested for large break LOCA under the same boundary conditions. Critical thermal hydraulic parameters of both the systems are presented. Results obtained are approximately similar in both cases. Nevertheless, the PSIS would be a better choice for handling such scenarios due to its reduced and passive components. [Preview Abstract] |
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