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 C1: Nuclear and High Energy Physics |
Hide Abstracts |
Chair: Gary Kyle, New Mexico State University Room: Union East, 3rd Floor Templeton |
Friday, October 17, 2008 1:30PM - 1:54PM |
C1.00001: Neutrino Oscillations: an Overview Invited Speaker: The phenomenon of neutrino oscillations will be reviewed. Background on neutrinos, flavor, flavor conservation, and oscillations will be presented. The experiments that demonstrate oscillations and their role in determining the oscillation parameters will be described. Some recent results that arise from a new analysis tool that incorporates the full three neutrino oscillation probabilities and a full three neutrino treatment of the interaction with the Earth's matter will be given.The small mixing parameter $\theta_{13}$ is found to be -0.07+0.18-0.11. Note that it is (statistically insignificantly) negative, a region of parameter space often overlooked, and that the errors are asymmetric arising from linear terms in the oscillation probabilities previously ignored. Since $\theta_{13}$ determines the size of possible CP violation and the size of effects that distinguish the mass hierarchy, it is of particular importance. Some thoughts on the future will be given. [Preview Abstract] |
Friday, October 17, 2008 1:54PM - 2:18PM |
C1.00002: Nuclear isoscaling and fair sampling Invited Speaker: The isoscaling phenomenon was first observed in nuclear multifragmentation experiments and has become a hot topic as it could provide a probe of the nuclear equation of state to understand nuclear matter at extreme condition of isospin such as in neutron stars. The present work studies isoscaling using 1) classical molecular dynamics simulations, 2) percolation and 3) probabilistic arguments, and determines that isoscaling is a general phenomenon that can exist independent of the nuclear reaction, and it is expected to occur in disassemblying systems with no more than fair sampling. In collaboration with Alan Davila, University of Texas at Austin; Claudio Dorso, Universidad de Buenos Aires; Carlos Hernandez, Universidad de Colima; Christian Escudero, University of Texas at El Paso; and Jorge Mu\~noz, CalTech. [Preview Abstract] |
Friday, October 17, 2008 2:18PM - 2:30PM |
C1.00003: Calculations of magnetic fields for the NPDGamma experiment at the SNS Septimiu Balascuta, Ricardo Alarcon, Seppo Penttila, Geoff Greene The NPDGamma experiment measures the parity-violating directional $\gamma $-ray asymmetry in the capture of polarized cold neutrons on liquid para-hydrogen using a pulsed neutron beam from the Spallation Neutron Source, a Super Mirror Polarizer and a Spin Flipper. Using Finite Element Analysis programs we have designed the permanent magnets of the compensation magnet of the Super Mirror Polarizer and the optimum geometry of the guide coils to generate the static 10 Gauss guide field. A magnetic shielding around the experiment has been designed to attenuate the residual fields outside the NPDGamma concrete cave. The efficiency of the Spin Flipper was estimated. The magnetic field gradients inside the beam volume from the Spin Flipper to the exit of the Hydrogen Target were shown to be small enough such that they do not produce a systematic effect to the experiment through the Stern-Gerlach steering of the neutron spin. [Preview Abstract] |
Friday, October 17, 2008 2:30PM - 2:54PM |
C1.00004: 100 TeV Proton-Antiproton Collider in the SSC Tunnel Invited Speaker: Two developments over the past decade have made it possible to design a high-luminosity 100 TeV hadron collider in the SSC tunnel in Texas. First, superconducting magnet technology has matured so that it is now feasible to build 16 Tesla Nb$_{3}$Sn dipoles and 450 T/m quadrupoles for a collider lattice. Second, Fermilab has advanced the state of art of antiproton sources so that it is possible to accumulate the antiprotons needed to sustain a luminosity of $\sim $10$^{35}$cm$^{-2}$s$^{-1}$ and techniques to sustain the luminosity during a store. Synchrotron damping of the beams has a time constant of $\sim $15 minutes, providing stability against mechanisms of slow emittance growth. The proposed single-ring collider would open a new era for high energy physics, after the LHC era that is about to begin, in which weak boson fusion would dominate as a pathway to new particle production. It would extend the reach for discovery beyond LHC by the same factor that LHC will extend beyond Tevatron. [Preview Abstract] |
Friday, October 17, 2008 2:54PM - 3:06PM |
C1.00005: Relative rho-omega production phase Valeria Frisullo, John Cumalat The relative $\rho-\omega$ production phase is studied by looking at the interference effects in the dimuon decay mode of the photoproduced $\rho$ and $\omega$ mesons. This is the first measurement of the interference effect using dimuons. The data from the photoproduction experiment FOCUS at Fermi National Accelerator Laboratory (Fermilab) are used for this measurement. [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