Wed·Sep 14, 2011Wednesday·September 14, 2011

1. 01*

   Beam Energy Dependence of Directed and Elliptic Flow Measurement from the STAR Experiment

   Yadav Pandit (for the STAR Collaboration)🇺🇸

   Measurements of anisotropic flow in heavy-ion collisions provide insight into the early stage of the system's evolution. This proceedings presents directed and elliptic flow for Au+Au collisions at 39, 11.5 and 7.7 GeV, and for Cu+Cu at 22.4 GeV, measured in the STAR Experiment at RHIC. Differential measurements of directed and elliptic flow of charged particles as a function of centrality, transverse momentum and pseudorapidity are discussed.

   nucl-exJ.Phys.Conf.Ser.(2011)·10 citations
2. 02*

   Photoproduction of ${\eta }^{{}^{\prime }}$ Mesons from Nuclei

   Mariana Nanova (for the CBELSA/TAPS Collaboration)🇩🇪

   The photoproduction of ${\eta }^{{}^{\prime }}$-mesons from different nuclei has been measured using the Crystal Barrel(CB)/TAPS detector system at the ELSA accelerator facility in Bonn. Recent results on the in-medium properties of the ${\eta }^{{}^{\prime }}$-meson, derived from the transparency ratio measurements, are presented. The absorption of the ${\eta }^{{}^{\prime }}$-meson in nuclear matter is compared to the properties of the other mesons ($\eta$ and $\omega$).

   nucl-ex1 citation
3. 03*

   Solar neutrinos and the sun

   Aldo Serenelli🇪🇸

   We present updated standard solar models (SSMs) that incorporate the latest results for nuclear fusion rates, recently published. We show helioseismic results for high and low metallicity compositions and also for an alternative set of solar abundance, derived from 3D model atmospheres, which give intermediate results. For the high and low metallicity models, we show that current solar neutrino data can not differentiate between models and that a measurement of the CNO fluxes is necessary to achieve that goal. A few additional implications of a hypothetical measurement of CNO neutrinos, both in terms of solar and stellar physics, are discussed.

   ↳ astro-ph.SRhep-exnucl-ex6 citations
4. 04*

   Coupled-channel effective field theory and proton-${}^7$Li scattering

   Vadim Lensky🇬🇧 · Michael C. Birse🇬🇧

   We apply the renormalisation group (RG) to analyse scattering by short-range forces in systems with coupled channels. For two S-wave channels, we find three fixed points, corresponding to systems with zero, one or two bound or virtual states at threshold. We use the RG to determine the power countings for the resulting effective field theories. In the case of a single low-energy state, the resulting theory takes the form of an effective-range expansion in the strongly interacting channel. We also extend the analysis to include the effects of the Coulomb interaction between charged particles. The approach is then applied to the coupled $p+{}^7$Li and $n+{}^7$Be channels which couple to a $J^P=2^{-}$ state of ${}^8$Be very close to the $n+{}^7$Be threshold. At next-to-leading order, we are able to get a good description of the $p+{}^7$Li phase shift and the ${}^7$Be(n,p)${}^7$Li cross section using four parameters. Fits at one order higher are similarly good but the available data are not sufficient to determine all five parameters uniquely.

   ↳ nucl-thhep-phnucl-exEPJA(2011)·32 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.