Thu·Sep 8, 2016Thursday·September 8, 2016

1. 01*

   Many Facets of Strangeness Nuclear Physics with Stored Antiprotons

   Josef Pochodzalla🇩🇪 · Sebastian Bleser🇩🇪 · Alicia Sanchez Lorente🇩🇪 · Marta Martinez Rojo🇩🇪 · Marcell Steinen🇩🇪 · Jürgen Gerl🇩🇪 · Jasmina Kojouharova🇩🇪 · Ivan Kojouharova🇩🇪

   Stored antiprotons beams in the GeV range represent a unparalleled factory for hyperon-antihyperon pairs. Their outstanding large production probability in antiproton collisions will open the floodgates for a series of new studies of strange hadronic systems with unprecedented precision. The behavior of hyperons and -- for the first time -- of antihyperons in nuclear systems can be studied under well controlled conditions. The exclusive production of $\Lambda \bar{\Lambda }$ and ${\Sigma }^{-}\bar{\Lambda }$ pairs in antiproton-nucleus interactions probe the neutron and proton distribution in the nuclear periphery and will help to sample the neutron skin. For the first time, high resolution $\gamma$-spectroscopy of doubly strange nuclei will be performed, thus complementing measurements of ground state decays of double hypernuclei with mesons beams at J-PARC or possible decays of particle unstable hypernuclei in heavy ion reactions. High resolution spectroscopy of multistrange $\Xi$-atoms are feasible and even the production of ${\Omega }^{-}$-atoms will be within reach. The latter might open the door to the $|s|$=3 world in strangeness nuclear physics, by the study of the hadronic ${\Omega }^{-}$-nucleus interaction and the very first measurement of a spectroscopic quadrupole moment of a baryon which will be a benchmark test for our understanding of hadron structure.

   nucl-exnucl-thJPS Conf.Proc.(2017)·7 citations
2. 02*

   Experimental results on charge fluctuations in heavy-ion collisions

   D. K. Mishra🇮🇳 · P. Garg🇺🇸 · P. K. Netrakanti🇮🇳 · L. M. Pant🇮🇳 · A. K. Mohanty🇮🇳

   We present a subset of experimental results on charge fluctuation from the heavy-ion collisions to search for phase transition and location of critical point in the QCD phase diagram. Measurements from the heavy-ion experiments at the SPS and RHIC energies observe that total charge fluctuations increase from central to peripheral collisions. The net-charge fluctuations in terms of dynamical fluctuation measure ${\nu }_{(+-,dyn)}$ are studied as a function of collision energy (\sqsn) and centrality of the collisions. The product of ${\nu }_{(+-,dyn)}$ and $⟨N_{ch}⟩$ shows a monotonic decrease with collision energies, which indicates that at LHC energy the fluctuations have their origin in the QGP phase. The fluctuations in terms of higher moments of net-proton, net-electric charge and net-kaon have been measured for various \sqsn. Deviations are observed in both $S\sigma$ and $\kappa {\sigma }^2$ for net-proton multiplicity distributions from the Skellam and hadron resonance gas model for \sqsn $<$ 39 GeV. Higher moment results of the net-electric charge and net-kaon do not observe any significant non-monotonic behavior as a function of collision energy. We also discuss the extraction of the freeze-out parameters using particle ratios and experimentally measured higher moments of net-charge fluctuations. The extracted freeze-out parameters from experimentally measured moments and lattice calculations, are found to be in agreement with the results obtained from the fit of particle ratios to the thermal model calculations.

   nucl-exhep-exnucl-thAdv.High Energy Phys.(2017)·4 citations
3. 03*

   Partial-Wave Analysis of Nucleon-Nucleon Elastic Scattering Data

   Ron L. Workman🇺🇸 · William J. Briscoe🇺🇸 · Igor I. Strakovsky🇺🇸

   Energy-dependent and single-energy fits to the existing nucleon-nucleon database have been updated to incorporate recent measurements. The fits cover a region from threshold to 3 GeV, in the laboratory kinetic energy, for proton-proton scattering, with an upper limit of 1.3 GeV for neutron-proton scattering. Experiments carried out at the COSY-WASA and COSY-ANKE facilities have had a significant impact on the partial-wave solutions. Results are discussed in terms of both partial-wave and direct reconstruction amplitudes.

   ↳ nucl-thhep-exhep-phnucl-exPRC(2016)·53 citations
4. 04*

   Event-by-event generation of vorticity in heavy-ion collisions

   Wei-Tian Deng🇨🇳 · Xu-Guang Huang🇨🇳

   In a noncentral heavy-ion collision, the two colliding nuclei have finite angular momentum in the direction perpendicular to the reaction plane. After the collision, a fraction of the total angular momentum is retained in the produced hot quark-gluon matter and is manifested in the form of fluid shear. Such fluid shear creates finite flow vorticity. We study some features of such generated vorticity, including its strength, beam energy dependence, centrality dependence, and spatial distribution.

   ↳ nucl-thhep-phnucl-exJ.Phys.Conf.Ser.(2017)·8 citations
5. 05*

   Tagged spectator DIS on a polarized spin-1 target

   W. Cosyn🇧🇪 · M. Sargsian🇺🇸 · C. Weiss🇺🇸

   We discuss the process of deep-inelastic electron scattering (DIS) on the polarized deuteron with detection of a nucleon in the nuclear fragmentation region ("spectator tagging"). We cover (a) the general structure of the semi-inclusive DIS cross section on a spin-1 target; (b) the tagged structure functions in the impulse approximation, where deuteron structure is described by the $NN$ light-front wave function; (c) the extraction of free neutron structure through on-shell extrapolation in the recoil proton momentum. As an application we consider the extraction of the neutron spin structure function $g_{1n}$ through polarized electron scattering on the longitudinally polarized deuteron with proton tagging and on-shell extrapolation. Such measurements would be possible at an Electron-Ion Collider (EIC) with polarized deuteron beams and forward proton detectors.

   ↳ hep-phnucl-exnucl-thPoS(2016)·2 citations
6. 06*

   High flux lithium antineutrino source with variable hard spectrum

   V.I. Lyashuk🇷🇺

   The work is devoted to development of hard electron antineutrino source with variable and regulated (controlled) spectrum. The high flux antineutrino source with hard antineutrino spectrum based on neutron activation of 7Li and subsequent fast beta-decay (T 1/2 = 0.84 s) of the 8Li isotope with emission of antineutrino with energy up to 13 MeV - is discussed. Creation of the intensive isotope neutrino source of hard spectrum will allow to increase the detection statistics of neutrino interaction and it is especially urgent for oscillation experiments. The scheme of the proposed neutrino source is based on the continuous transport of the created 8Li to the neutrino detector, which moved away from the place of neutron activation. Analytical expressions for lithium antineutrino flux is obtained. The discussed source will ensure to increase the cross section for reactions with deuteron from several times to tens compare to the reactor antineutrino spectrum. An another unique feature of the installation is the possibility to vary smoothly the hardness of the antineutrino spectrum.

   ↳ physics.ins-detnucl-ex5 citations

* Reconstructed cohort: no mailing for this day survives in the archive. Papers are grouped by their submission times and arXiv's announcement cut-off, assuming announcement without delay; positions follow identifier order. Validated at ~91% exact-day agreement against the archived era.