Date: Fri, 28 Sep 12 00:10:07 GMT Subject: nucl-ex daily 4 new + 4 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 Wed 26 Sep 12 20:00:00 GMT to Thu 27 Sep 12 20:00:00 GMT ------------------------------------------------------------------------------ \\ arXiv:1209.6164 Date: Thu, 27 Sep 2012 08:54:07 GMT (554kb) Title: Evolution of the decay mechanisms in central collisions of $Xe$ + $Sn$ from $E/A$ = 8 to 29 $MeV$ Authors: A. Chbihi, L. Manduci, J. Moisan, E. Bonnet, J. D. Frankland, R. Roy, G. Verde Categories: nucl-ex Comments: Invited Talk given at the 11th International Conference on Nucleus-Nucleus Collisions (NN2012), San Antonio, Texas, USA, May 27-June 1, 2012. To appear in the NN2012 Proceedings in Journal of Physics: Conference Series (JPCS) \\ Collisions of Xe+Sn at beam energies of $E/A$ = 8 to 29 $MeV$ and leading to fusion-like heavy residues are studied using the $4\pi$ INDRA multidetector. The fusion cross section was measured and shows a maximum at $E/A$ = 18-20 $MeV$. A decomposition into four exit-channels consisting of the number of heavy fragments produced in central collisions has been made. Their relative yields are measured as a function of the incident beam energy. The energy spectra of light charged particles (LCP) in coincidence with the fragments of each exit-channel have been analyzed. They reveal that a composite system is formed, it is highly excited and first decays by emitting light particles and then may breakup into 2- or many- fragments or survives as an evaporative residue. A quantitative estimation of this primary emission is given and compared to the secondary decay of the fragments. These analyses indicate that most of the evaporative LCP precede not only fission but also breakup into several fragments. \\ ( http://arxiv.org/abs/1209.6164 , 554kb) ------------------------------------------------------------------------------ \\ arXiv:1209.6168 Date: Thu, 27 Sep 2012 09:07:40 GMT (13kb) Title: Neutron skins of $^{208}$Pb and $^{48}$Ca from pionic probes Authors: E.Friedman Categories: nucl-ex nucl-th Comments: 9 pages, 3 figures, to be published in Nuclear Physics A \\ The neutron skin of $^{208}$Pb has received considerable attention in recent years. A variety of strongly-interacting probes depict a rather consistent picture but pionic probes have not been referred to in this context. We present here neutron-skin values from pionic atoms and from total reaction cross sections of $\pi ^+$ between 0.7 and 2 GeV/c which fit well into the picture. In addition we show that a neutron skin for $^{48}$Ca can be obtained from existing data on pionic atoms and the result agrees with pion scattering experiments and with the scattering of $\alpha $ particles. \\ ( http://arxiv.org/abs/1209.6168 , 13kb) ------------------------------------------------------------------------------ \\ arXiv:1209.6198 Date: Thu, 27 Sep 2012 11:48:23 GMT (928kb) Title: Open heavy-flavour measurements in pp and Pb-Pb collisions with ALICE at the LHC Authors: Sarah LaPointe on behalf of the ALICE collaboration Categories: nucl-ex \\ We present an overview of measurements related to open heavy-flavour production with the ALICE experiment at the LHC. Studies are performed using single leptons (electrons at mid-rapidity and muons at forward-rapidity) and D mesons, which are reconstructed via their hadronic decay channels. The measured differential production cross sections in proton-proton collisions at $\sqrt{s}$ = 2.76 and 7 TeV are in agreement with perturbative QCD calculations. Results from Pb-Pb collisions at $\sqrt{s_{NN}}$ = 2.76 TeV on the nuclear modification factor $R_{AA}$ are shown, along with the elliptic flow $\nu_2$. \\ ( http://arxiv.org/abs/1209.6198 , 928kb) ------------------------------------------------------------------------------ \\ arXiv:1209.6282 Date: Thu, 27 Sep 2012 16:47:59 GMT (1604kb,D) Title: Open heavy flavour production via semi-leptonic decay muons in lead lead collisions at $\sqrtsnn = 2.76$ \TeV\ with the ATLAS detector at the LHC Authors: Yujiao Chen on behalf of ATLAS Collaboration Categories: nucl-ex \\ Measurements of heavy quark production and suppression in ultra-relativistic nuclear collisions probe the interactions of heavy quarks with the hot, dense medium created in the collisions. ATLAS has measured heavy quark production in $\sqrtsnn = 2.76$ \TeV \PbPb collisions via semi-leptonic decays of open heavy flavour hadrons to muons. Results are presented for the per-event muon yield as a function of muon transverse momentum, \pT, over the range of $4 < \pT < 14$ \GeV. The centrality dependence of the muon yields is characterized by the "central to peripheral" ratio, \Rcp. Muon production is suppressed by approximately a factor of two in central collisions relative to peripheral collisions. Within the experimental errors, the observed suppression is independent of muon \pT\ for all centralities. \\ ( http://arxiv.org/abs/1209.6282 , 1604kb) %-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%- ------------------------------------------------------------------------------ \\ arXiv:1209.6086 (*cross-listing*) Date: Wed, 26 Sep 2012 21:57:38 GMT (50kb) Title: Jet Fragmentation Function Moments in Heavy Ion Collisions Authors: Matteo Cacciari, Paloma Quiroga-Arias, Gavin P. Salam and Gregory Soyez Categories: hep-ph hep-ex nucl-ex Comments: 15 pages, 5 figures \\ The nature of a jet's fragmentation in heavy-ion collisions has the potential to cast light on the mechanism of jet quenching. However the presence of the huge underlying event complicates the reconstruction of the jet fragmentation function as a function of the momentum fraction z of hadrons in the jet. Here we propose the use of moments of the fragmentation function. These quantities appear to be as sensitive to quenching modifications as the fragmentation function directly in z. We show that they are amenable to background subtraction using the same jet-area based techniques proposed in the past for jet p_t's. Furthermore, complications due to correlations between background-fluctuation contributions to the jet's p_t and to its particle content are easily corrected for. \\ ( http://arxiv.org/abs/1209.6086 , 50kb) ------------------------------------------------------------------------------ \\ arXiv:1209.6142 (*cross-listing*) Date: Thu, 27 Sep 2012 07:18:46 GMT (2146kb) Title: Fission Dynamics of Compound Nuclei Authors: Yoritaka Iwata, Sophia Heinz Categories: nucl-th nucl-ex Comments: To appear in CERN Rep \\ Collisions between $^{248}$Cm and $^{48}$Ca are systematically investigated by time-dependent density functional calculations with evaporation prescription. Depending on the incident energy and impact parameter, fusion, deep-inelastic and quasi-fission events are expected to appear. In this paper, possible fission dynamics of compound nuclei is presented. \\ ( http://arxiv.org/abs/1209.6142 , 2146kb) ------------------------------------------------------------------------------ \\ arXiv:1209.6216 (*cross-listing*) Date: Thu, 27 Sep 2012 13:15:33 GMT (19kb) Title: Search for a bound state of kaon and pion Authors: T. Kishimoto, F. Khanam, T. Hayakawa, S. Ajimura, T. Itabashi, K. Matsuoka, S. Minami, Y. Mitoma, A. Sakaguchi, Y. Shimizu, K. Terai, T. Sato, H. Noumi, M. Sekimoto, H. Takahashi, T. Fukuda, W. Imoto and Y. Mizoi Categories: hep-ex nucl-ex Comments: 7 pages, 3 figures \\ We have searched for a bound state of kaon and pion denoted by $X$. The $X$ was conjectured to explain the so-called $\Theta^+$ resonance as a bound state of kaon, pion and nucleon. This model explains almost all properties of the $\Theta^+$, however, the model works only if the $K \pi$ interaction is strongly attractive. It is so strong that it could make a bound state $X$. Here we report a result of the search for the $X$ by using the $K^+ + N \rightarrow X^+ + N$ reaction at P$_K\sim$ 1.2 GeV/c. The $X^+ \rightarrow K^+ \gamma \gamma$ decay produces $K^+$ in momentum region where other processes cannot fill. We observed signature of the $X^+$ with statistical significance of 2 $\sigma$. Production cross section of $X$ with respect to that of $\pi^0$ is 1$\pm$0.5% if we take it as an evidence and 1.5% if we set an upper limit. \\ ( http://arxiv.org/abs/1209.6216 , 19kb) ------------------------------------------------------------------------------ \\ arXiv:1209.6330 (*cross-listing*) Date: Thu, 27 Sep 2012 18:58:31 GMT (44kb) Title: Event-by-event anisotropic flow in heavy-ion collisions from combined Yang-Mills and viscous fluid dynamics Authors: Charles Gale, Sangyong Jeon, Bjoern Schenke, Prithwish Tribedy and Raju Venugopalan Categories: nucl-th hep-ph nucl-ex Comments: 5 pages, 9 figures \\ Anisotropic flow coefficients v_1-v_5 in heavy ion collisions are computed by combining a classical Yang-Mills description of the early time glasma flow with the subsequent relativistic viscous hydrodynamic evolution of matter through the quark-gluon plasma and hadron gas phases. The glasma dynamics, as realized in the IP-Glasma model, takes into account event-by-event geometric fluctuations in nucleon positions and intrinsic sub-nucleon scale color charge fluctuations; the pre-equilibrium flow of matter is then matched to the MUSIC algorithm describing viscous hydrodynamic flow and particle production at freeze-out. The IP-Glasma+MUSIC model describes well both transverse momentum dependent and integrated v_n data measured at the Large Hadron Collider (LHC) and the Relativistic Heavy Ion Collider (RHIC). The model also reproduces the event-by-event distributions of v_2, v_3 and v_4 measured by the ATLAS collaboration. The implications of our results for better understanding of the dynamics of the glasma as well as for the extraction of transport properties of the quark-gluon plasma are outlined. \\ ( http://arxiv.org/abs/1209.6330 , 44kb) %%--%%--%%--%%--%%--%%--%%--%%--%%--%%--%%--%%--%%--%%--%%--%%--%%--%%--%%--%% ------------------------------------------------------------------------------ \\ arXiv:1206.3812 (*cross-listing*) replaced with revised version Thu, 27 Sep 2012 02:30:43 GMT (74kb) Title: Neutrinoproduction of Photons and Pions From Nucleons in a Chiral Effective Field Theory for Nuclei Authors: Brian D. Serot and Xilin Zhang Categories: nucl-th hep-ex nucl-ex Comments: 21 pages, 7 figures, typos corrected. arXiv admin note: substantial text overlap with arXiv:1011.5913 Journal-ref: Phys. Rev. C 86, 015501 (2012) DOI: 10.1103/PhysRevC.86.015501 \\ ( http://arxiv.org/abs/1206.3812 , 74kb) ------------------------------------------------------------------------------ \\ arXiv:1206.6324 (*cross-listing*) replaced with revised version Thu, 27 Sep 2012 03:54:38 GMT (96kb) Title: Incoherent Neutrinoproduction of Photons and Pions in a Chiral Effective Field Theory for Nuclei Authors: Xilin Zhang and Brian D. Serot Categories: nucl-th hep-ex nucl-ex Comments: 32 pages, 12 figures, and 3 tables, typos corrected Journal-ref: Phys. Rev. C 86, 035502 (2012) DOI: 10.1103/PhysRevC.86.035502 \\ ( http://arxiv.org/abs/1206.6324 , 96kb) ------------------------------------------------------------------------------ \\ arXiv:1208.0897 (*cross-listing*) replaced with revised version Thu, 27 Sep 2012 06:26:39 GMT (1305kb,D) Title: Constraining the initial temperature and shear viscosity in a hybrid hydrodynamic model of $\sqrt{s_{NN}}$=200 GeV Au+Au collisions using pion spectra, elliptic flow, and femtoscopic radii Authors: R. A. Soltz, I. Garishvili, M. Cheng, B. Abelev, A. Glenn, J. Newby, L. A. Linden Levy, S. Pratt Categories: nucl-th nucl-ex Comments: 20 pages, 18 figures, v2 includes improvements to clarity to figures and additional systematic study \\ ( http://arxiv.org/abs/1208.0897 , 1305kb) ------------------------------------------------------------------------------ \\ arXiv:1208.6566 (*cross-listing*) replaced with revised version Wed, 26 Sep 2012 21:27:12 GMT (2306kb,D) Title: Nuclear modification of J/psi production in Pb-Pb collisions at sqrt(s_NN)=2.76 TeV Authors: Jens Wiechula (for the ALICE Collaboration) Categories: hep-ex nucl-ex Comments: 4 pages, 7 figures, proceedings for the 5th international conference on hard and electromagnetic probes of high-energy nuclear collisions (Hard Probes 2012), Cagliari, Italy \\ ( http://arxiv.org/abs/1208.6566 , 2306kb) %%%---%%%---%%%---%%%---%%%---%%%---%%%---%%%---%%%---%%%---%%%---%%%---%%%--- 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. 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