Bulletin of the American Physical Society
2005 2nd Joint Meeting of the Nuclear Physics Divisions of the APS and The Physical Society of Japan
Sunday–Thursday, September 18–22, 2005; Maui, Hawaii
Session 1WA: Workshop 1A: Nuclear/Hadron Physics at the JLAB and J-PARC |
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Sponsoring Units: DNP JPS Chair: Edward Hungerford, University of Houston Room: Ritz-Carlton Hotel Salon 4 |
Sunday, September 18, 2005 9:00AM - 9:30AM |
1WA.00001: QCD and Hadron Physics Invited Speaker: |
Sunday, September 18, 2005 9:30AM - 10:00AM |
1WA.00002: Strangeness Production in Electromagnetic Interactions off the Proton Invited Speaker: A program of strange particle production off the proton is currently underway with the CLAS spectrometer in Hall B at Jefferson Laboratory. Measurements have been carried out at energies up to 6~GeV with electron and real photon beams, both of which are available with high polarization. This talk will focus on a detailed overview of the results of our measurement program, which is designed to measure cross sections and polarization observables for $K^+\Lambda$ and $K^+\Sigma^0$ final states over a broad kinematic range in $Q^2$ from 0.5 to 3.5~(GeV/c)$^2$ and $W$ from threshold to 3.0~GeV, while spanning nearly the full angular range of the kaon in the center-of-mass system. The main goals of this program are to better understand the reaction mechanism of open-strangeness production, specifically with respect to the different production mechanisms for $\Lambda$ and $\Sigma$ hyperons. Additionally these data have strong sensitivity to disentangle the different resonant and non-resonant amplitudes in the intermediate state. These studies are expected to provide insight into the nature of QCD in the confinement domain. The precision of our data has been demonstrated to be highly sensitive to different models of the production process. [Preview Abstract] |
Sunday, September 18, 2005 10:00AM - 10:30AM |
1WA.00003: Hypernuclear spectroscopy at JLab Invited Speaker: Lambda hypernuclei have been extensively studied by using the meson-induced reactions, such as ($\pi^+$, K$^+$) and (K$^-$, $\pi^-$) at KEK and BNL. The (e,e$'$K$^+$) reaction is a new method for hypernuclear spectroscopy, and it has unique advantages over those meson-induced reactions. For example, the (e,e$'$K$^+$) reaction excites spin-flip as well as spin-non-flip $\Lambda$ hypernuclear states and produces neutron rich $\Lambda$ hypernuclei by converting a proton to a $\Lambda$ hyperon. From the experimental point of view, it is a great advantage that a high-quality electron beam available at JLab allows us to improve the energy resolution down to sub-MeV levels. Encouraged by the success of the first hypernuclear spectroscopy through the (e,e$'$K$^+$) reaction (JLab E89-009), a new improved experiment with a newly developed High resolution Kaon Spectrometer (HKS) and a new configuration of the electron spectrometer is going to start at JLab Hall C (JLab E01-011/E02-017) from June, 2005. Overview of the JLab Hall-C hypernuclear experiments and current analysis status will be presented. If time allows, an upgrade plan of the electron spectrometer will be also explained. [Preview Abstract] |
Sunday, September 18, 2005 10:30AM - 11:00AM |
1WA.00004: Dynamical Models of Electromagnetic Production of Hyperons and Hypernuclei Invited Speaker: In the nucleon resonance region, Kaon production is in general weaker than pion production. Therefore the channel coupling effects due to pion channels must be included in using electromagnetic Kaon production reactions to study hyperons and hypernuclei. In this talk I will discuss how such channel coupling effects can be included in a dynamical approach and present results from a recent coupled-channel calculation of $\gamma$ p $\rightarrow$ K$^+ \Lambda, K \Sigma$. The implication of our results in investigating electromagnetic production of hypernuclei will be discussed with some illustrative examples. [Preview Abstract] |
Sunday, September 18, 2005 11:00AM - 11:30AM |
1WA.00005: Three- and four-body structure of light hypernuclei Invited Speaker: Two important goals of hypernuclear physics are to investigate the hyperon-nucleon(YN) and hyperon-hyperin(YY) interactions and (2) to discover novel dynamical nuclear structure effects induced by the hyepron such as $\Lambda$, $\Sigma$, $\Xi$ and so on. At the Jeffereson Laboratory and J-PARC, they planning to produce many single hypernuclei and double $\Lambda$ hypernuclei. Here we discuss about 1) YN spin-orbit force and the structure of $^9_{\Lambda}$Be and $^{13}_{\Lambda}$C, 2) YN spin-spin force and the structure of $^7_{\Lambda}$Li, 3) $\Lambda N-\Sigma N$ coupling and the structure of $^4_ {\Lambda}$He and $^7_{\Lambda}$He, and 4)$\Lambda -\Lambda$ interaction and structure of light p- shell double $\Lambda$ hypernuclei. We also emphasis what is interesting and important from the view point of hypernuclear physics. [Preview Abstract] |
Sunday, September 18, 2005 11:30AM - 12:00PM |
1WA.00006: Strangeness in Neutron Stars Invited Speaker: Neutron stars contain cold hadronic matter gravitationally compressed to densities that may be ten to twenty times higher than the density of ordinary nuclear matter. At such extreme conditions, pressures in the cores of neutron stars might be able to break neutrons, protons, and other hadronic constituents in the centers of neutron stars into their quark constituents, creating a new state of matter known as quark matter. If quark matter exists in the cores of neutron stars, it will be a color superconductor whose complex condensation pattern changes with density inside the star. The strange quark plays a crucial role in all of this. It is also a key player for the possible existence of absolutely stable strange quark matter, a configuration of matter even more stable than nuclear matter. In the latter event, neutron stars would be largely composed of superconducting strange quark matter, possibly enveloped in a thin nuclear crust. In this talk I will review the exciting role played by the presence of strangeness in cold hadronic matter at high densities, followed by a discussion of the astrophysical implications of strangeness in neutron stars. [Preview Abstract] |
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