Bulletin of the American Physical Society
APS April Meeting 2018
Volume 63, Number 4
Saturday–Tuesday, April 14–17, 2018; Columbus, Ohio
Session K11: Hadronic Physics IV |
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Sponsoring Units: GHP DNP Chair: Douglas Hasell, MIT Room: A220-221 |
Sunday, April 15, 2018 3:30PM - 3:42PM |
K11.00001: Abstract Withdrawn
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Sunday, April 15, 2018 3:42PM - 3:54PM |
K11.00002: Studying the A=3 EMC Effect in the JLab MARATHON experiment Tyler Hague MARATHON is a 12-GeV era Deep Inelastic Scattering experiment in Hall A at Jefferson Lab (JLab). The experiment will use Tritium, Helium-3, and Deuterium targets to measure cross section ratios. The expected data will allow us to compare the strength of the EMC effect in A=3 mirror nuclei. We can also use this data to extract the neutron to proton structure function ratio $F^{2}_{n}/F^{2}_{p}$. Models of the EMC effect diverge in the high Bjorken x region when examining this ratio. The results from the experiment will be critical for comparing to theoretical models and for furthering our understanding of the EMC effect. [Preview Abstract] |
Sunday, April 15, 2018 3:54PM - 4:06PM |
K11.00003: Abstract Withdrawn
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Sunday, April 15, 2018 4:06PM - 4:18PM |
K11.00004: Abstract Withdrawn
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Sunday, April 15, 2018 4:18PM - 4:30PM |
K11.00005: Isospin Dependence of the EMC Effect and Short range Correlations Barak Schmookler, Meytal Duer, Axel Schmidt, Shalev Gilad, Larry Weinstein, Eliezer Piasetzky, Or Hen The number of Short-Range Correlated (SRC) pairs in nuclei is known to linearly correlate with the strength of the European Muon Collaboration (EMC) effect. This linear correlation has lead to theoretical models of the EMC effect where primarily nucleons which are members of SRC pairs are modified. Since, as recent measurements have shown, the overwhelming majority of these SRC pairs are neutron-proton (np) pairs, a consequence of a SRC-based EMC effect is an isospin-dependence to the EMC effect. That is, a larger fraction of protons than of neutrons should be modified in asymmetric, neutron-rich nuclei. By constructing per-neutron and per-proton SRC and EMC cross-section ratios, we look at how the number of correlated pairs depends on the number of neutrons and protons. With these new normalizations, we find that the per-neutron EMC slopes and SRC ratios both saturate much sooner than the standard per-nucleon quantities, starting already with Carbon; while the per-proton values continue to increase, even going from Iron to Gold. In addition, we extract a universal EMC modification function based on the assumption np pair dominance. Using the saturation of the per-neutron quantities, we make predictions of the magnitude of the EMC effect in heavy nuclei. [Preview Abstract] |
Sunday, April 15, 2018 4:30PM - 4:42PM |
K11.00006: Abstract Withdrawn
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Sunday, April 15, 2018 4:42PM - 4:54PM |
K11.00007: Determining the Unknown $\Lambda -n$ Interaction by Investigating the $\Lambda nn$ Resonance Bishnu Pandey The newly approved Jlab experiment E12-17-003 is to search and measure the $\Lambda$ binding energy $(B_{\Lambda})$ and natural width $(\Gamma_{\Lambda})$ of a possible $\Lambda nn$ three-body resonance, using the $^{3}H(e,e',K^{+})\Lambda nn$ reaction with the high quality CEBAF electron beam and the Hall A high resolution spectrometers. This resonance, if exists as indicated by the result of HypHI experiment [1] and predicted by theory [2], should be a pure isospin T = 1 stae. With the highest possible precision achievable by electro-production from the jlab experiment, the measured $B_{\Lambda}$ and $\Gamma_{\Lambda}$ can be used to investigate and determine the unknown $\Lambda n$ interaction, experimentally for the first time, relative to $\Lambda p$ interaction fitted from limited $\Lambda p$ scattering data. The measurement may provide important clues to the long stand puzzle of charge-symmetry-breaking(CSB) in $\Lambda N$ interactions and it may impact on your understanding on hypernuclei and EOS of neutron stars. \\ \setlength{\parindent}{0cm} [1] C. Rappold et al.,Phys.Rev. C88, 041001(R) (2013) [2] Iraj R. Afnan and Benjamin F. Gibson, Phys. Rev. C92, 054608 (2015) [Preview Abstract] |
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