Date: Fri, 31 Aug 12 00:10:47 GMT
Subject: nucl-ex daily 5 new + 4 crosses received   by eprepget 

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received   by eprepget from  Wed 29 Aug 12 20:00:00 GMT  to  Thu 30 Aug 12 20:00:00 GMT
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arXiv:1208.6115
Date: Thu, 30 Aug 2012 09:11:52 GMT   (951kb)

Title: High-precision measurement of total fission cross sections in spallation
  reactions of 208Pb and 238U
Authors: K.-H. Schmidt, B. Jurado, R. Pleskac, M. V. Ricciardi, J. Benlliure,
  T. Enqvist, F. Farget, A. Bacquias, L. Giot, V. Henzl, D. Henzlova, A.
  Kelic-Heil, S. Leray, S. Lukic, Son Nguyen Ngoc, A. Boudard, E. Casarejos, M.
  Fernandez, T. Kurtukian, P. Nadtochy, D. Perez, C. Schmitt
Categories: nucl-ex
Comments: 18 pages, 12 figures
\\
  Total cross sections for proton- and deuteron-induced-fission of 208Pb and
238U have been determined in the energy range between 500 MeV and 1 GeV. The
experiment has been performed in inverse kinematics at GSI Darmstadt,
facilitating the counting of the projectiles and the identification of the
reaction products. High precision between 5 and 7 percent has been achieved by
individually counting the beam particles and by registering both fission
fragments in coincidence with high efficiency and full Z resolution. Fission
was clearly distinguished from other reaction channels. The results were found
to deviate by up to 30 percent from Prokofiev's systematics on total fission
cross sections. There is good agreement with an elaborate experiment performed
in direct kinematics.
\\ ( http://arxiv.org/abs/1208.6115 ,  951kb)
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arXiv:1208.6164
Date: Thu, 30 Aug 2012 13:17:59 GMT   (24kb)

Title: New Measurements of the Transverse Beam Asymmetry for Elastic Electron
  Scattering from Selected Nuclei
Authors: The HAPPEX and PREX Collaborations
Categories: nucl-ex
Comments: 5 pages, 3 figures, submitting to PRL
\\
  We have measured the beam-normal single-spin asymmetry $A_n$ in the elastic
scattering of 1-3 GeV transversely polarized electrons from $^1$H and for the
first time from $^4$He, $^{12}$C, and $^{208}$Pb. For $^1$H, $^4$He and
$^{12}$C, the measurements are in agreement with calculations that relate $A_n$
to the imaginary part of the two-photon exchange amplitude including inelastic
intermediate states. Surprisingly, the $^{208}$Pb result is significantly
smaller than the corresponding prediction using the same formalism. These
results suggest that a systematic set of new $A_n$ measurements might emerge as
a new and sensitive probe of the structure of heavy nuclei.
\\ ( http://arxiv.org/abs/1208.6164 ,  24kb)
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arXiv:1208.6169
Date: Thu, 30 Aug 2012 13:31:53 GMT   (66kb)

Title: Measurement of jet spectra in Pb-Pb collisions at $\sqrt{s_{NN}}$=2.76
  TeV with the ALICE detector at the LHC
Authors: ALICE collaboration, Marta Verweij for the collaboration
Categories: nucl-ex
Comments: * Temporary entry *; 4 pages, 7 figures, proceedings from 5th
  International Conference on Hard and Electromagnetic Probes of High-Energy
  Nuclear Collisions (Hard Probes 2012) at Cagliari (Italia)
\\
  We report a measurement of transverse momentum spectra of jets detected with
the ALICE detector in Pb-Pb collisions at sqrt(sNN)=2.76 TeV. Jets are
reconstructed from charged particles using the anti-kt jet algorithm. The
background from soft particle production is determined for each event and
subtracted. The remaining influence of underlying event fluctuations is
quantified by embedding different probes into heavy-ion data. The reconstructed
transverse momentum spectrum is corrected for background fluctuations by
unfolding. We compare the inclusive jet spectra reconstructed with R=0.2 and
R=0.3 for different centrality classes and compare the jet yield in Pb-Pb and
pp events.
\\ ( http://arxiv.org/abs/1208.6169 ,  66kb)
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arXiv:1208.6171
Date: Thu, 30 Aug 2012 13:34:32 GMT   (1555kb,D)

Title: Measurement of heavy-flavour decay muon production at forward rapidity
  in pp and Pb-Pb collisions at sqrt(s_NN)=2.76 TeV with the ALICE experiment
Authors: Diego Stocco, for the ALICE Collaboration
Categories: nucl-ex hep-ex
Comments: 4 pages, 3 figures, Proceedings of parallel talk at the 5th
  international conference on hard and electromagnetic probes of high-energy
  nuclear collisions (Hard Probes 2012), Cagliari, Italy
\\
  The ALICE experiment measured the heavy-flavour production in the semi-muonic
decay channel at forward rapidities ($2.5<y<4$) in pp and Pb--Pb collisions at
$\sqrt{s_{{NN}}} = 2.76$ TeV. We report on the first results on the $p_{\rm
T}$-differential cross-sections in pp collisions as well as on the nuclear
modification factors as a function of the transverse momentum and centrality.
\\ ( http://arxiv.org/abs/1208.6171 ,  1555kb)
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arXiv:1208.6218
Date: Thu, 30 Aug 2012 16:06:49 GMT   (66kb,D)

Title: Measurement of charged particle R_AA at high pT in PbPb collisions at
  sqrt(sNN)=2.76 TeV with CMS
Authors: Krisztian Krajczar, for the CMS Collaboration
Categories: nucl-ex hep-ex
Comments: Proceedings of the talk was given at Hard Probes 2012, 27 May - 1
  June, Cagliari, Italy
\\
  Charged particle transverse momentum (pT) spectra have been measured by CMS
for pp and PbPb collisions at the same sqrt(sNN)=2.76 TeV collision energy per
nucleon pairs. Calorimeter-based jet triggers are employed to enhance the
statistical reach of the high-pT measurements. The nuclear modification factor
(R_AA) is obtained in bins of collision centrality for the PbPb data sample
dividing by the measured pp reference spectrum. In the range pT = 5-10 GeV/c,
the charged particle yield in the most central PbPb collisions is suppressed by
up to a factor of 7. At higher pT, this suppression is significantly reduced,
approaching a factor of 2 for particles with pT = 40-100 GeV/c.
\\ ( http://arxiv.org/abs/1208.6218 ,  66kb)
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arXiv:1208.6156 (*cross-listing*)
Date: Thu, 30 Aug 2012 12:43:48 GMT   (1371kb,D)

Title: Measurement of isolated photon production in pp and PbPb collisions at
  sqrt{sNN} =2.76$ TeV with CMS
Authors: Yen-Jie Lee, for the CMS collaboration
Categories: hep-ex nucl-ex
Comments: Presented at HP2012: Hard Probes 2012
Report-no: CMS-CR 2012/178
\\
  Isolated photon production is measured in pp and PbPb collisions at
nucleon-nucleon centre-of-mass energies of 2.76 TeV in the pseudorapidity range
|eta|<1.44 and transverse energies E_T between 20 and 80 GeV with the CMS
detector at the LHC. The measured E_T spectra are found to be in good agreement
with next-to-leading-order perturbative QCD predictions. The ratio of PbPb to
pp isolated photon E_T-differential yields, scaled by the number of incoherent
nucleon-nucleon collisions, is consistent with unity for all PbPb reaction
centralities.
\\ ( http://arxiv.org/abs/1208.6156 ,  1371kb)
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arXiv:1208.6215 (*cross-listing*)
Date: Thu, 30 Aug 2012 15:52:52 GMT   (1875kb)

Title: Evaporation Prescription for Time-Dependent Density Functional
  Calculations
Authors: Yoritaka Iwata, Sophia Heinz
Categories: nucl-th nucl-ex
Comments: To appear in the NN2012 Proceedings in Journal of Physics: Conference
  Series
\\
  Collisions between $^{248}$Cm and $^{48}$Ca are systematically calculated by
time-dependent density functional calculations with evaporation prescription.
Depending on the incident energy and impact parameter, fusion, fusion-fission,
quasi-fission events are expected to appear. In this paper, the evaporation
prescription is introduced, which is expected to be rather important to
heavy-ion reactions producing superheavy nuclei, where the heavier total mass
can be related to the higher total excitation energy.
\\ ( http://arxiv.org/abs/1208.6215 ,  1875kb)
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arXiv:1208.6235 (*cross-listing*)
Date: Thu, 30 Aug 2012 16:55:38 GMT   (1649kb,D)

Title: Jet-Tagged Back-Scattering Photons For Quark Gluon Plasma Tomography
Authors: Rainer J. Fries, S. De and D. K. Srivastava
Categories: nucl-th hep-ph nucl-ex
Comments: Contribution to Hard Probes 2012; 4 pages, 4 figures
\\
  Several sources of direct photons are known to contribute to the total photon
yield in high energy nuclear collisions. All of these photons carry
characteristic and important information on the initial nuclei or the hot and
dense fireball created in the collision. We investigate the possibility to
separate photons from back-scattering of high momentum quarks off quark gluon
plasma from other sources. Their unique kinematics can be utilized through high
energy jet triggers on the away-side. We discuss the basic idea and estimate
the feasibility of such a measurement at RHIC and LHC.
\\ ( http://arxiv.org/abs/1208.6235 ,  1649kb)
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arXiv:1208.6258 (*cross-listing*)
Date: Thu, 30 Aug 2012 18:42:40 GMT   (46kb,D)

Title: Nuclear effects in photoproduction of heavy quarks and vector mesons in
  ultraperipheral PbPb and pPb collisions at the LHC
Authors: Adeola Adeluyi, C.A. Bertulani, and M.J. Murray
Categories: nucl-th hep-ex hep-ph nucl-ex
Comments: 4 pages, 4 figures
\\
  The comparison of photoproduction cross sections for $c\bar{c}$ and b-b(bar)
in PbPb and pPb collisions can give sensitivity to nuclear shadowing effects.
The photoproduction of vector mesons is even more sensitive to the underlying
gluon distributions. In this study we present the cross sections and rapidity
dependence of the photoproduction of heavy quarks and exclusive production of
vector mesons in ultraperipheral pPb and PbPb collisions at the Large Hadron
Collider at sqrt(s_NN)=5 TeV and sqrt(s_NN)=2.76$ TeV, respectively. The
potentials of using these processes for constraining nuclear gluon shadowing
are explored. It is found that photoproduction of $J/\psi$ and $\Upsilon$ in
PbPb collisions in particular exhibit very good sensitivity to gluon shadowing.
\\ ( http://arxiv.org/abs/1208.6258 ,  46kb)
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arXiv:1208.5977
replaced with revised version Thu, 30 Aug 2012 15:37:53 GMT   (157kb,D)

Title: Search for the He-{\eta} bound states with the WASA-at-COSY facility
Authors: M. Skurzok, W. Krzemie\'n, P. Moskal
Categories: nucl-ex
Comments: Procedings of the MESON 2012 conference 3 pages, 1 figure
\\ ( http://arxiv.org/abs/1208.5977 ,  157kb)
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