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Archive for the ‘Seminars’ Category


NPP Seminar: Jianping Chen (JLab)

February 18th, 2016 by geurts

Date: Thursday February 25, 2016  at 4pm
Location: 223 Herman Brown Hall, Rice University

Title: SoLID Program at Jefferson Lab
Speaker: Jianping Chen (JLab)
Abstract: Jefferson Lab 12 GeV energy upgrade opens up a new frontier for precision studies of nucleon structure and precision tests of the Standard Model. To fully exploit the potential of the upgrade, a new large acceptance device, SoLID, was proposed and designed to be able to handle very high luminosity. The new capability of SoLID allows the study of the transverse momentum dependent quark distributions of the nucleon in the valence quark region to reach the ultimate precision. The SoLID parity-violating deep-inelastic-scattering experiment will provide a precision test of the Standard Model with an equivalent energy reach comparable to LHC experiments. SoLID also offers a new capability to perform measurements of J/Psi production in the threshold region to study the gluon dynamics of strong QCD. The SoLID physics program will be discussed in details along with the current status of the SoLID project.

NPP Seminar by Cheuk-Yin Wong (ORNL)

December 31st, 2015 by geurts

Date: Thursday January 28, 2016  at 4pm
Location: 223 Herman Brown Hall, Rice University

Title: The Hadron pT Distribution in High-Energy pp Collisions and its Implications
Speaker: Cheuk-Yin Wong (ORNL)
Abstract: Transverse momentum distribution of jets and hadrons provide useful information on the collision mechanisms and their subsequent dynamics. It was found recently that the hadron spectra spanning over 14 decades of magnitude from the lowest of ~0.5 GeV/c to the highest $p_T$ of a few hundred GeV/c at central rapidity in pp collisions at LHC can be adequately described by a single Tsallis distribution with only three
apparent degrees of freedom [1].  The simplicity of the p_T spectrum suggests that a single mechanism dominates over a large pT domain at central rapidity in these high-energy collisions.  As the high-$p_T$ region is known to arise from the relativistic hard-scattering process at high pT, one is led to the suggestion that the hard-scattering process dominates over a very large pT domain in these high-energy pp collisions. We shall explore the implications of the pT distribution on many related topics of the diminishing role of the competing flux-tube fragmentation [2] and the initial conditions for the momentum kick model of the near-side ridge in pp collisions [3].
[1]  C.Y.Wong and G.Wilk, Acta Phys. Pol. {B43}, 2047 (2012);
C.Y.Wong and G.Wilk, Phys. Rev. {D87},114007 (2013);
C. Y. Wong, G. Wilk, L. J. L. Cirto and C. Tsallis,  Phys. Rev. {D91}, 114027 (2015).
[2]  C.Y.Wong, Phys.Rev. {D92}, 074007 (2015).
[3]  C.Y.Wong, Phys.Rev. {C84}, 024901 (2011).

NPP Seminar by Satish Desai (Univ. of Minnesota)

October 22nd, 2015 by geurts

Date: Thursday November 12, 2015  at 4pm
Location: 223 Herman Brown Hall, Rice University

Title: First Oscillation Results from NOvA
Speaker: Satish Desai (Univ. of Minnesota)
Abstract: NOvA is an off-axis long baseline neutrino oscillation experiment studying electron neutrino appearance and muon neutrino disappearance using the Fermilab NuMI beam.  It consists of functionally identical tracking calorimeters, one located at Fermilab, the other 810 km away in Ash River, Minnesota.  The NOvA collaboration has recently released its first oscillation results, including evidence for electron neutrino appearance and measurements of muon neutrino disappearance.  I will describe the NOvA detectors, the calibration and analysis methods and finally present our first results.

NPP seminar by Jongmin Cho (OSU)

September 30th, 2015 by geurts

Date: Thursday October 8, 2015  at noon
Location: 223 Herman Brown Hall, Rice University

Title: Use of PET for proton therapy/range verification and for hybrid/bimetallic nanoparticles
Speaker: Jongmin Cho (OSU)
Abstract:
  • 1st talk (20 min): Hydrogel fiducial markers for proton range verification

Proton range verification is a very important issue in proton radiation therapy since critical organs can be located just beyond the proton range. 18O, 63Cu and 68Zn were studies as proton range verification materials since they are strongly activated by low energy protons and decay with positron emissions. We used some of these elements to develop patient implantable hydrogel fiducial markers which are PET visible. They can be used as universal fiducial markers due to their CT/PET/MRI/US visibility and also as the proton therapy/range verification markers.

  • 2nd talk (20 min): Hybrid bimetallic nanoparticles for radiotherapy and molecular imaging

We developed hybrid bi-metallic nanoparticles – Zn@Au (Zn core and Au shell). When irradiated with protons using a medical cyclotron, the Zn cores are activated to decay with positron emission with relatively long half-lives. Therefore, PET imaging shows the in-vivo distribution of those injected nanoparticles. The developed Zn@Au nanoparticles have near identical radiosensitization as gold nanoparticles (GNPs) of the same size. Therefore, the Zn@Au nanoparticles may enable PET image guided GNP mediated radiation therapy as well as molecular imaging.

  • 3rd talk (10 min): Introduction to Oklahoma State University Medical Physics Program

https://research.okstate.edu/venture-i

http://physics.okstate.edu/www/medical-physics.html

http://physics.okstate.edu/

  • QA session (10 min)

NPP Seminar by Uwe Titt (MD Anderson)

September 9th, 2015 by geurts

Date: Thursday September 17, 2015  at noon
Location: 223 Herman Brown Hall, Rice University

Title: Clinical Research using the Monte Carlo Method
Speaker: Uwe Titt (MD Anderson)
Abstract:  This presentation will introduce the Monte Carlo method and discuss its application in the context of medical physics projects performed at the University of Texas, M. D. Anderson Cancer Center.
The MCNPX Monte Carlo code was applied to solve numerous problems, among which were the development of a novel photon radiotherapy modality using a flattening filter free clinical accelerator, the configuration and testing of a proton therapy treatment planning system, proton beam modification devices and automated Monte Carlo simulation of actual proton therapy treatment plans.

NPP Seminar by David Tlusty (Rice Univ)

August 29th, 2015 by geurts

Date: Thursday September 3, 2015  at 4pm
Location: 223 Herman Brown Hall, Rice University

Title: Open Heavy Flavor Measurements at STAR
Speaker: David Tlusty (Rice University)
Abstract:
In relativistic heavy ion collisions at RHIC, heavy quarks are expected to be created from initial hard scatterings. Since heavy quarks have large masses, long life time, and negligible annihilation due to their small population, the number of heavy quarks is conserved during whole medium evolution. The interaction between heavy quarks and the medium is sensitive to the early medium dynamics, therefore heavy quarks are suggested as an ideal probe to quantify the properties of the strongly interacting QCD matter.In this talk, we report on recent STAR results of heavy flavor production at $\sqrt{s_{NN}}$ = 39, 62.4, 193, 200 and 500 GeV in p+p, Au+Au and U+U collisions. We present nuclear modification
factor and elliptic flow of open charm mesons and electrons from semileptonic decays of heavy flavor hadrons. STAR data are compared to theoretical model calculations and physics implications are discussed.

NPP Seminar by Sandra Padula (Universidade Estadual Paulista, Sao Paolo, Brazil)

April 20th, 2015 by geurts

Date: Monday April 27, 2015  at noon
Location: 227 Herman Brown Hall, Rice University

Title: Bose-Einstein correlations: a means to probe stellar and femto scales
Speaker: Sandra Padula (Universidade Estadual Paulista, Sao Paolo, Brazil)
Abstract:
Bose-Einstein correlations were behind the phenomenon that allowed to estimate star dimensions in the mid-fifties. At the turn of that decade, on a strike of serendipity, a similar phenomenon was discovered in antiproton-proton collisions at the highest available energies at that time.  Ever since, this technique has been applied to very different systems and energies, allowing to study their dimensions. In this talk, an overview of the phenomenon and some examples of the results achieved along decades will be discussed, finalizing with recent results obtained at the LHC.

NPP Seminar by Rainer Fries (Texas A&M)

April 14th, 2015 by geurts

Date: Wednesday April 22, 2015  at noon
Location: 223 Herman Brown Hall, Rice University

Title: The Quark Recombination Model and Applications in High Energy Collisions
Speaker: Rainer Fries
Abstract:
Quarks, usually captives of confinement, can be liberated in high energy collisions either at small distance scales
or at high temperatures. The process of re-hadronization of quarks in such collisions is a complicated problem in quantum
chromodynamics which is not fully solved. Since ultimately hadrons, or their decay products, are measured in detectors,
effective descriptions and hadronization models are usually used to to describe this important step in a collision. In this
talk I will argue why quark recombination or coalescence models have their place in our toolbox, and what they have
achieved specifically when describing collisions of nuclei at high energies.. I will end with a look at some recent
developments, including a project to describe the hadronization of QCD jets in the presence of quark gluon plasma.

NPP Seminar by Richard Wall (Rice University)

April 12th, 2015 by geurts

Date: Tuesday April 21, 2015 at noon
Location: 223 Herman Brown Hall, Rice University

Title: Studies of GeV-scale WIMPs using charge signals at XENON100
Speaker: Richard Wall (Rice)
Abstract: Various theoretical models and recent experimental results have led to growing interest in the search for WIMP-like dark matter in the mass range of a few GeV.  One important class of detector used in this study is based on the liquid-gas, dual-phase Xenon time projection chamber (as in XENON100 and LUX).  These detectors nominally use both scintillation and ionization signals to define their fiducial volume and reject background events, and are, to date, most sensitive to WIMPs on the 10-100 GeV scale.  Using only the ionization signal, it is possible to achieve greater sensitivity to WIMPs with a mass on the scale of 1 GeV, as the scintillation detection efficiency for these recoils is, on average, quite low.  With this in mind, we present the a study of ionization signals using data collected by the XENON100 detector, with an eye towards improving the collaboration’s limit on WIMPs in this region.

NPP Seminar by Lijuan Ruan (BNL)

March 24th, 2015 by geurts

Date: Tuesday March 31, 2015 at noon
Location: 223 Herman Brown Hall, Rice University

Title: Electron-Positron Tomography of Quark-Gluon Plasma
Speaker: Lijuan Ruan (BNL)
Abstract:
 Electron-positron pairs are penetrating probes of Quark-Gluon Plasma created in relativistic heavy ion collisions. They can provide information deep into the system and early time. At STAR, we use electron-positron tomography to study chiral symmetry, temperature, and lifetime of hot, dense medium. In this talk, I will review recent results and discuss
future perspectives.