Bulletin of the American Physical Society
2008 Joint Fall Meeting of the Texas and Four Corners Sections of APS, AAPT, and Zones 13 and 16 of SPS, and the Societies of Hispanic & Black Physicists
Volume 53, Number 11
Friday–Saturday, October 17–18, 2008; El Paso, Texas
Session E5: Nuclear Physics |
Hide Abstracts |
Chair: Andrea Palounek, Los Alamos National Laboratory Room: Union East, 3rd Floor Wiggins |
Friday, October 17, 2008 3:30PM - 3:42PM |
E5.00001: Isoscaling and the High Temperature Limit Jorge Munoz, Claudio Dorso, Hernandez Carlos, Jorge Lopez This study shows that isoscaling, usually studied in nuclear reactions, is a phenomenon common to all cases of fair sampling. Exact expressions for the yield ratio $R_{21}$ and approximate expressions for the isoscaling parameters $\alpha$ and $\beta$ are obtained and compared to experimental results. It is concluded that nuclear isoscaling is bound to contain a component due to sampling and, thus, a words of caution is issued to those interested in extracting information about the nuclear equation of state from isoscaling. [Preview Abstract] |
Friday, October 17, 2008 3:42PM - 3:54PM |
E5.00002: Shielding studies for 2.5 MeV neutrons using GEANT4 Felipe Tovar, Miguel Castro-Colin, Laszlo Sajo-Bohus By means of the software GEANT4, a toolkit based on the Monte Carlo method, we seek to study the dispersive effects that 2.5 MeV neutrons have, as well the gamma-yield, after interacting with various attenuating materials with simple geometrical configurations. A simulated mass of Uranium-238 is considered in the study with the purpose of observing the behavior of its characteristic yield after fast neutron irradiation. [Preview Abstract] |
Friday, October 17, 2008 3:54PM - 4:06PM |
E5.00003: GEANT4 Simulation of the TPC Remington Thornton The Neutron Induced Fission Fragment Tracking Experiment (NIFFTE) collaboration's Time Projection Chamber (TPC) is designed to measure better fission cross-section measurements that can be used in designs for future generations of more advance nuclear power plants. One important requirement of the TPC project is to have an accurate simulation of the physical volume and realistic data flow. GEANT4 is a multi-purpose 3-D Monte Carlo simulation package that has been chosen for this effort. The sensitive volume of the TPC has been created in GEANT4 along with simulations of the detector response, which includes: 3-D ion diffusion, pedestal fluctuations, charge sharing and digital latching noise. In this talk, results from the initial simulation will be described in detail. [Preview Abstract] |
Friday, October 17, 2008 4:06PM - 4:18PM |
E5.00004: Transverse Single Spin Asymmetries in Heavy Flavor production in Polarized p+p Collisions at PHENIX Hisham Albataineh The measurement of transverse single spin asymmetries ($A_N$) at high energies gives us an opportunity to probe the quark and gluon structure of transversely polarized nucleons. At RHIC energy, heavy flavor production is dominated by gluon-gluon fusion, so the Collins effect has minimum impact on $A_N$ as the gluon's transversity is zero. The measurement of $A_N$ in heavy flavor production is uniquely sensitive to the gluon Sivers distribution which is related to the orbital angular momentum of gluons inside the polarized protons. The PHENIX experiment has collected 2.7 pb$^{-1}$ data in transversely polarized p+p collisions at $\sqrt{s}$=200GeV in 2006 run. Results for J/$\psi$ and open heavy flavor $A_N$ at forward rapidity will be presented. [Preview Abstract] |
Friday, October 17, 2008 4:18PM - 4:30PM |
E5.00005: Search for Open Charm with a Combined Analysis of Single-Muon Events in the Central and Muon arms of the PHENIX detector Mikhail Stepanov The production of $c\bar{c}$ pairs in $p+p$ collisions at the RHIC energy is dominated by gluon-gluon fusion. Therefore the production of single muons from charm decay in polarized $p+p$ collisions is expected to be sensitive to the polarized gluon distribution in the proton. In order to develop discriminants and selection cuts for enriching the charm content of a sample of single-muon events, a multistage simulation has been conducted including the PHENIX detector response to investigate correlations between muon tracks in the Muon Arm and charged hadron/lepton tracks in the Central Arm of the PHENIX detector. Two separate simulation outputs have been produced and compared: for open charm ($c\bar{c}$) events and minimum-bias ({\em i.e.}, mostly light-quark) events. The goal is to develop multivariate selection criteria which can significantly enhance the charm content of a sample of single-muon events, by studying and comparing different kinematic quantities of the Muon Arm tracks and the Central Arm tracks. A leading-order simulation indicates stronger tendency for charm events to have the maximum-$p_T$ Central-Arm and Muon-Arm tracks emitted back-to-back in azimuthal angle $\phi$. More detailed simulations are planned. [Preview Abstract] |
Friday, October 17, 2008 4:30PM - 4:42PM |
E5.00006: Pion-Nucleon Scattering and Analysis from threshold to the N*(1440) Resonance Region Michael Sadler, Shon Watson, Jugoslav Stahov Many measurements for pion-nucleon scattering from threshold to the N*(1440) resonance region have been made since 1980, when the landmark Karlsruhe-Helsinki (KH) and Carnegie Mellon-Berkeley (CMB) partial wave analyses (PWA) were completed. These measurements consist of differential cross sections and analyzing powers for elastic scattering and charge exchange. Spin rotation parameters for elastic scattering in the momentum interval 0.4 -- 0.7 GeV/c have also been obtained. The program culminated with measurements of $\pi $-p -$>$ Neutrals (charge exchange, multiple pi-zero final states, eta production, and inverse photoproduction) using the Crystal Ball at BNL. Resonance parameters for the N*(1440) in the Review of Particle Physics by the Particle Data Group have been obtained from the KH and CMB analyses. The 2006 edition also includes the analysis by George Washington University (GWU) ``for averages, fits, limits, etc.'', but the parameters were unchanged. An overview of the data will be presented along with comparisons to PWA. [Preview Abstract] |
Friday, October 17, 2008 4:42PM - 4:54PM |
E5.00007: Introduction to NIFFTE and its Data Acquisition System Alexander White The Neutron Induced Fission Fragment Tracking Experiment (NIFFTE) is a collaboration to design, build, and operate a Time Projection Chamber (TPC) for precise fission cross-section measurements. Precise data on the fission cross sections will facilitate actinide-burning reactor designs and investigate the proliferation resistance of potential new fuel cycles. These will allow the next generation of nuclear power generators to operate with increased safety, efficiency, and security. Essential to the TPC is a new data acquisition system utilizing Maximum Integration Data Acquisition System (MIDAS). MIDAS will coordinate data collection, monitor environmental variables such as gas pressure and temperature, and automate slow controls such as high voltage supplies. After a general introduction to NIFFTE, I will discuss the design and initial hardware testing for this innovative data acquisition system. [Preview Abstract] |
Friday, October 17, 2008 4:54PM - 5:06PM |
E5.00008: Testing of a charged particle spectrometer for a proton/deuteron beam facility David McKenna, John Ellsworth, Lawrence B. Rees BYU's Laboratory Nuclear Astrophysics Research Group (LNAR) is constructing a proton/deuteron beam facility to study fusion of bound reactants. Incorporated in this facility is a charged particle spectrometer utilizing a two dimensional, multi-channel analyzer capable of detecting 150k events per second. This spectrometer consists of a student built target chamber with a silicon charged particle detector telescope, LabView software, a NIDAQ card, standard NIM BIN amplifiers, and a custom designed interface. We report the testing of the spectrometer using scattered 2.1 MeV protons and 5.47 MeV alpha particles. [Preview Abstract] |
Follow Us |
Engage
Become an APS Member |
My APS
Renew Membership |
Information for |
About APSThe American Physical Society (APS) is a non-profit membership organization working to advance the knowledge of physics. |
© 2024 American Physical Society
| All rights reserved | Terms of Use
| Contact Us
Headquarters
1 Physics Ellipse, College Park, MD 20740-3844
(301) 209-3200
Editorial Office
100 Motor Pkwy, Suite 110, Hauppauge, NY 11788
(631) 591-4000
Office of Public Affairs
529 14th St NW, Suite 1050, Washington, D.C. 20045-2001
(202) 662-8700