Date: Thu, 23 Dec 10 01:05:20 GMT Subject: nucl-ex daily 3 new + 3 crosses received by eprepget ------------------------------------------------------------------------------ ------------------------------------------------------------------------------ Send any comments regarding submissions directly to submitter. ------------------------------------------------------------------------------ Archives at http://arxiv.org/ To unsubscribe, e-mail To: nucl-ex@arXiv.org, Subject: cancel ------------------------------------------------------------------------------ received by eprepget from Tue 21 Dec 10 21:00:00 GMT to Wed 22 Dec 10 21:00:00 GMT ------------------------------------------------------------------------------ \\ arXiv:1012.5002 Date: Wed, 22 Dec 2010 15:11:12 GMT (52kb) Title: On the usage of electron beam as a tool to produce radioactive isotopes in photo-nuclear reactions Authors: G. G. Bunatian, V. G. Nikolenko and A. B. Popov Categories: nucl-ex Comments: The paper is 40 pages long. It contains 12 tables and 3 figures Report-no: Communication E6-2009-182 of JINR, Dubna, RF, 2009 \\ We treat the bremsstrahlung induced by initial electron beam in converter, and the production of a desirable radio-isotope due to the photo-nuclear reaction caused by this bremsstrahlung. By way of illustration, the yield of a number of some, the most in practice applicable, radio-isotopes is evaluated. The acquired findings persuade us that usage of modern electron accelerators offers a practicable way to produce the radio-isotopes needful nowadays for various valuable applications in the nuclear medicine. \\ ( http://arxiv.org/abs/1012.5002 , 52kb) ------------------------------------------------------------------------------ \\ arXiv:1012.5008 Date: Wed, 22 Dec 2010 15:30:29 GMT (1993kb,D) Title: Jet & Underlying Event Measurements in p-p collisions at RHIC Authors: Helen Caines for the STAR Collaboration Categories: nucl-ex hep-ex Comments: 4 pages, Proceedings of Hard Probes 2010 Conference \\ The physics of hadron-hadron collisions is very complex involving both perturbative and non-perturbative QCD. It is therefore imperative to study p-p collisions in as much detail as possible to provide a wide variety of data against which the various theoretical calculations can be tested. Direct jet measurements, for instance, help address fundamental questions of the fragmentation process. These measurements form a critical baseline for comparisons of results from heavy-ion studies, where modifications of the fragmentation functions are expected due to interactions of the high ${Q^2}$ scattered partons with the hot and dense medium. Finally, it is also important to gain a deeper understanding of how the beam-beam remnants, multi-parton interactions and initial- and final-state radiation combine to produce the particles observed in the underlying event. In this talk we present results on jet production and the underlying event in p-p collisions at 200 GeV collisions as measured by the STAR experiment at RHIC. \\ ( http://arxiv.org/abs/1012.5008 , 1993kb) ------------------------------------------------------------------------------ \\ arXiv:1012.5058 Date: Wed, 22 Dec 2010 17:57:35 GMT (385kb) Title: U_A(1) Symmetry Restoration from an In-Medium eta' Mass Reduction in sqrt(s(NN)) = 200 GeV Au+Au Collisions Authors: T. Csorgo (Harvard U. and MTA KFKI RMKI), R. Vertesi (MTA KFKI RMKI) and J. Sziklai (MTA KFKI RMKI) Categories: nucl-ex hep-ph nucl-th Comments: 12 pages, 5 figures, to appear in the Proceedings of the Gribov'80 Memorial Workshop \\ A reduction of the mass of the eta'(958) meson may signal restoration of the U_A(1) symmetry in a hot and dense hadronic matter, corresponding to the return of the 9th, "prodigal" Goldstone boson. We report on an analysis of a combined PHENIX and STAR data set on the intercept parameter of the two-pion Bose-Einstein correlation functions, as measuremed in sqrt(s(NN)) = 200 GeV Au + Au collisions at RHIC. To describe this combined PHENIX and STAR dataset, an in-medium eta' mass reduction of at least 200 MeV is needed, at the 99.9 % confidence level in a broad model class of resonance abundances. \\ ( http://arxiv.org/abs/1012.5058 , 385kb) %-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%- ------------------------------------------------------------------------------ \\ arXiv:1012.3746 (*cross-listing*) Date: Thu, 16 Dec 2010 20:57:25 GMT (11kb) Title: Two-photon exchange amplitudes for the elastic $ep$ scattering at Q^2=2.5 GeV^2 from the experimental data Authors: Dmitry Borisyuk, Alexander Kobushkin Categories: hep-ph nucl-ex Comments: 3 pages, 3 figures \\ We extract two-photon exchange amplitudes for the elastic electron-proton scattering at Q^2=2.5 GeV^2 from the unpolarized cross-section and recent polarization transfer measurements. There are three independent amplitudes, but only one of them, \delta G_M, can be determined with a reasonable accuracy(about 10%). The result is in good agreement with theoretical predictions. Rough estimates for two other amplitudes are obtained. \\ ( http://arxiv.org/abs/1012.3746 , 11kb) ------------------------------------------------------------------------------ \\ arXiv:1012.4917 (*cross-listing*) Date: Wed, 22 Dec 2010 09:49:08 GMT (313kb) Title: Explosive nucleosynthesis in core-collapse supernovae Authors: A. Arcones Categories: astro-ph.SR nucl-ex nucl-th Comments: 10 pages, 8 figures, invited talk, INPC 2010 Vancouver, Journal of Physics: Conference Series \\ The specific mechanism and astrophysical site for the production of half of the elements heavier than iron via rapid neutron capture (r-process) remains to be found. In order to reproduce the abundances of the solar system and of the old halo stars, at least two components are required: the heavy r-process nuclei (A>130) and the weak r-process which correspond to the lighter heavy nuclei (A<130). In this work, we present nucleosynthesis studies based on trajectories of hydrodynamical simulations for core-collapse supernovae and their subsequent neutrino-driven winds. We show that the weak r-process elements can be produced in neutrino-driven winds and we relate their abundances to the neutrino emission from the nascent neutron star. Based on the latest hydrodynamical simulations, heavy r-process elements cannot be synthesized in the neutrino-driven winds. However, by artificially increasing the wind entropy, elements up to A=195 can be made. In this way one can mimic the general behavior of an ejecta where the r-process occurs. We use this to study the impact of the nuclear physics input (nuclear masses, neutron capture cross sections, and beta-delayed neutron emission) and of the long-time dynamical evolution on the final abundances. \\ ( http://arxiv.org/abs/1012.4917 , 313kb) ------------------------------------------------------------------------------ \\ arXiv:1012.5084 (*cross-listing*) Date: Wed, 22 Dec 2010 20:07:15 GMT (36kb) Title: Spectra, elliptic flow and azimuthally sensitive HBT radii from Buda-Lund model for sqrt(s(NN)) = 200 GeV Au+Au collisions Authors: A. Ster (MTA KFKI RMKI and Lund University), M. Csanad (ELTE), T. Csorgo (Harvard and MTA KFKI RMKI), B. Lorstad (Lund University), and B. Tomasik (Uni. Mateja Bela and FNSPE) Categories: nucl-th hep-ph nucl-ex Comments: 8 pages, 5 figures, 2 tables \\ We present calculations of elliptic flow and azimuthal dependence of correlation radii in the ellipsoidally symmetric generalization of the Buda-Lund hydrodynamic model of hadron production in high-energy nuclear collisions. We compare them to data from RHIC by simultaneous fits to azimuthally integrated invariant spectra of pions, kaons and protons-antiprotons measured by PHENIX in Au+Au reactions at center of mass energy of 200 AGeV. STAR data were used for azimuthally sensitive two-particle correlation function radii and for the transverse momentum dependence of the elliptic flow parameter v2. We have found that the transverse flow is faster in the reaction plane then out of plane, which results in a reaction zone that gets slightly more elongated in-plane than out of plane. The model parameters extracted from the fits are shown and discussed. \\ ( http://arxiv.org/abs/1012.5084 , 36kb) %%--%%--%%--%%--%%--%%--%%--%%--%%--%%--%%--%%--%%--%%--%%--%%--%%--%%--%%--%% ------------------------------------------------------------------------------ \\ arXiv:1010.3974 (*cross-listing*) replaced with revised version Wed, 22 Dec 2010 03:32:51 GMT (877kb) Title: The Decay Properties of the 1^{-+} Hybrid State Authors: Hua-Xing Chen, Zhi-Xing Cai, Peng-Zhi Huang and Shi-Lin Zhu Categories: hep-ph hep-ex nucl-ex nucl-th Comments: revised and accepted by PRD \\ ( http://arxiv.org/abs/1010.3974 , 877kb) ------------------------------------------------------------------------------ \\ arXiv:1012.4659 replaced with revised version Wed, 22 Dec 2010 08:32:38 GMT (145kb) Title: System Size Dependence of Particle Production at the SPS Authors: C. Blume Categories: nucl-ex Comments: 10 pages, 4 figurs. Proceedings of the 6th International Workshop on Critical Point and Onset of Deconfinement in Dubna, Aug. 2010 \\ ( http://arxiv.org/abs/1012.4659 , 145kb) %%%---%%%---%%%---%%%---%%%---%%%---%%%---%%%---%%%---%%%---%%%---%%%---%%%--- For subscribe options to combined physics archives, e-mail To: physics@arXiv.org, Subject: subscribe ----------------------------------------------------------------------------- For help on viewing and making submissions, see http://arXiv.org/help/ For a list of archive mirror sites, see http://arXiv.org/servers.html ----------------------------------------------------------------------------- Third-party submissions cause excessive problems. Author self-submissions are exceedingly preferred. E-mail submissions have been discontinued in favor of better support for Web submissions. See http://arXiv.org/help/uploads