Bulletin of the American Physical Society
Joint Fall 2017 Meeting of the Texas Section of the APS, Texas Section of the AAPT, and Zone 13 of the Society of Physics Students
Volume 62, Number 16
Friday–Saturday, October 20–21, 2017; The University of Texas at Dallas, Richardson, Texas
Session N6: Nuclear Physics II |
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Chair: Sally Hicks, University of Dallas Room: DGAC 1.135 |
Saturday, October 21, 2017 2:30PM - 2:42PM |
N6.00001: Measuring Jet-like Hadron-$\phi$(1020) Correlations in p-Pb Collisions with ALICE at the LHC Justin Blair The ALICE experiment at the Large Hadron Collider (LHC) is designed to study relativistic heavy ion collisions. Studying hadronic resonance particles (such as the $K*$, $\phi$(1020), $\Lambda$(1520)) can give us information about the hadronic phase of the collisions. Since resonance particles decay and undergo scattering and regeneration, comparing resonance production across different multiplicities and collision system sizes allows us to probe properties of the hadronic medium. In addition, studying two-particle jet-like angular correlations allows us to separate particles produced in hard-processes (jets) from those produced from soft processes (bulk). Resonances produced with respect to jets can be further differentiated into a near-side peak (with little medium interaction) and an away-side peak (with a longer path-length through the medium). In this way, performing two-particle jet-like angular correlations with identified resonances allows us to study the interaction of resonances with the initial collision medium, as well as any differences in production mechanisms across different collision systems. I will present in this talk the current progress of 2D jet-like hadron-$\phi$(1020) angular correlations in p-Pb collisions as a function of multiplicity. [Preview Abstract] |
Saturday, October 21, 2017 2:42PM - 2:54PM |
N6.00002: Phenomenological models of dihadron correlations on transverse rapidity from charged hadron production in Au+Au collisions at 200 GeV Lanny Ray, Alex Jentsch Two-particle correlations on transverse momentum ($p_t$), or transverse rapidity ($y_t$), provide experimental access to dynamical processes beyond that which can be studied with angular correlations or single-particle spectra alone. The correlations on ($y_{t1},y_{t2}$) are generated by non-statistical, event-wise fluctuations in the $y_t$ spectrum of the produced particles. We consider two scenarios which can produce such fluctuations: (1) a hydrodynamic picture with varying initial conditions in which the freeze-out temperature fluctuates from event-to-event or within each event (hot and cold spots), along with fluctuations in radial flow velocity; (2) a fragmentation picture in which the $p_t$ distribution from soft, longitudinal color-strings fluctuates and the number and $Q^2$ of transversely fragmenting jets fluctuates. We show that phenomenological models based on each scenario are capable of describing the correlation data. The fluctuation amplitudes required to describe the data in the respective models can be compared to that allowed in dynamically based, theoretical models in order to either constrain or falsify those theories. Our results will be compared with theoretical predictions. [Preview Abstract] |
Saturday, October 21, 2017 2:54PM - 3:06PM |
N6.00003: Polysilicon Thin Film Amplifiers for Charged Particles Detectors Carlos Avila-Avendano, Israel Mejia, Luis Reyes, Sergiy Rozhdestvenskyy, Christopher Pham, Bruce Gnade, Manuel Quevedo-Lopez Radiation detection systems consists of two main building blocks: 1) radiation sensor and 2) the electronics to amplify the signal. While great intrinsic efficiency has been achieved by using solid-state sensors and Bi-CMOS amplifiers, there is a lack of reliable solution for cost-effective large-area radiation detectors. Thin film-based technologies can balance their moderated performance with higher geometric efficiency at a lower cost. Thin film transistors (TFT) are commonly used as addressing element in passive pixel sensors (PPS) schemes to transfer the charge from each detector to external crystalline silicon amplifiers. In the case of single radiation events, the PPS scheme must be substituted by an active pixel sensor (APS) approach, where an in-pixel preamplifier has to be integrated with each sensor to be able to detect the small amount of charge generated by the fast single event. In this work, we present the implementation of high performance polysilicon TFTs to integrate preamplifiers for charged particle spectroscopy. [Preview Abstract] |
Saturday, October 21, 2017 3:06PM - 3:18PM |
N6.00004: The $^{\mathrm{13}}$C($\alpha , n)^{\mathrm{16}}$O reaction and the effect of 1/2$^{\mathrm{+}}$ threshold level on its astrophysical $S$-factor FNU Shubhchintak, A. M. Mukhamedzhanov, C. A. Bertulani The $^{\mathrm{13}}$C($\alpha , n)^{\mathrm{16}}$O reaction is a neutron generator in asymptotic giant branch stars and is considered as the main source of neutrons for the $s$-process. However, there are controversies about its $S$-factor at astrophysical relevant energies (around 140-230 keV) where it is controlled by the 1/2$^{\mathrm{+}}$ (6.356 MeV) threshold level. In this context, using $R$-matrix based formalism of Trojan Horse (TH) mechanism we will present our calculations of astrophysical $S$-factor to reanalyze the recent TH data using both assumptions that the threshold level is a subthreshold bound state or a resonance state. [Preview Abstract] |
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