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arXiv:1109.6078
Date: Wed, 28 Sep 2011 02:20:49 GMT   (59kb,D)

Title: Upper Limit on the molecular resonance strengths in the
  ${}^{12}$C+${}^{12}$C fusion reaction
Authors: X. Tang, X. Fang, B. Bucher, H. Esbensen, C. L. Jiang, K. E. Rehm, and
  C. J. Lin
Categories: nucl-ex astro-ph.SR nucl-th
Comments: 4 pages, 3 figures, FUSION11 conference proceeding
\\
  Carbon burning is a crucial process for a number of important astrophysical
scenarios. The lowest measured energy is around E$_{\rm c.m.}$=2.1 MeV, only
partially overlapping with the energy range of astrophysical interest. The
currently adopted reaction rates are based on an extrapolation which is highly
uncertain because of potential resonances existing in the unmeasured energy
range and the complication of the effective nuclear potential. By comparing the
cross sections of the three carbon isotope fusion reactions,
${}^{12}$C+${}^{12}$C, ${}^{12}$C+${}^{13}$C and ${}^{13}$C+${}^{13}$C, we have
established an upper limit on the molecular resonance strengths in
${}^{12}$C+${}^{12}$C fusion reaction. The preliminary results are presented
and the impact on nuclear astrophysics is discussed.
\\ ( http://arxiv.org/abs/1109.6078 ,  59kb)
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arXiv:1109.6110
Date: Wed, 28 Sep 2011 06:40:57 GMT   (1198kb)

Title: Measurement of $\beta\beta$ Decay-Simulating Events in Nuclear Emulsion
  with Molybdenum Filling
Authors: V.D. Ashitkov, A.S. Barabash, V.Ya. Bradnova, V.A. Ditlov, V.V.
  Dubinina, N.P. Egorenkova, S.I. Konovalov, E.A. Pozharova, N.G. Polukhina,
  V.A. Smirnitsky, N.I. Starkov, M.M. Chernyavsky, T.V. Shchedrina and V.I.
  Umatov
Categories: nucl-ex
Comments: 6 pages, 4 figures
\\
  The measurement of positron--nucleus collisions was used to estimate the
possibility of suppressing background events that simulate $\beta\beta$ decay
in the emulsion region adjacent to molybdenum conglomerates. The range of the
escape of two relativistic particles from the interaction was found to be $<d>
= (0.60\pm 0.03) ~\mu$m, which approximately corresponds to the grain size of
developed nuclear emulsion. No correlation of the values of d with the angle
between two relativistic particles was observed. It was shown that it was
possible to exclude $\beta\beta$ decay background from electrons emerging in
the decay of elements of naturally occurring radioactive chains. The background
from $\beta$ decays of $^{90}$Sr and $^{40}$K available in emulsion around Mo
conglomerates was determined by the ratio of the volume $(\sim d^3)$ to the
total volume of emulsion and was found to be $1.5\cdot 10^{-2}$. It was shown
that the backgrounds from $^{40}$K, $^{90}$Sr and natural radioactivity could
be significantly suppressed and would not limit the sensitivity of the
experiment with 1 kg $^{100}$Mo.
\\ ( http://arxiv.org/abs/1109.6110 ,  1198kb)
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arXiv:1109.6208
Date: Wed, 28 Sep 2011 13:52:39 GMT   (149kb)

Title: In-Medium Energy Loss and Correlations in Pb-Pb Collisions at sqrt(s_NN)
  = 2.76 TeV
Authors: Jan Fiete Grosse-Oetringhaus, for the ALICE collaboration
Categories: nucl-ex hep-ex
Comments: Proceedings for EPIC@LHC, Bari, Italy
\\
  ALICE (A Large Ion Collider Experiment) is the dedicated heavy-ion experiment
at the LHC. In fall 2010, Pb-Pb collisions were recorded at a center-of-mass
energy of 2.76 TeV per nucleon pair, about 14 times higher than the energy
achieved in A-A collisions at RHIC. The study of the produced hot and dense
matter with an unprecedented energy density allows the characterization of the
quark-gluon plasma, the deconfined state of quarks and gluons, predicted by
QCD. The study of in-medium partonic energy loss allows insights into the
density of the medium and the energy-loss mechanisms. This paper presents
results based on inclusive spectra as well as two and more-particle
correlations of charged particles. These are well suited to assess in-medium
effects, ranging from the suppression of particles (R_AA) and away-side jets
(I_AA) at high pT to long-range phenomena attributed to collective effects like
the ridge at low pT. The analysis is discussed and the results are presented in
the context of earlier RHIC measurements where appropriate.
\\ ( http://arxiv.org/abs/1109.6208 ,  149kb)
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arXiv:1109.6306
Date: Wed, 28 Sep 2011 19:29:32 GMT   (112kb,D)

Title: Discovery of Gallium, Germanium, Lutetium, and Hafnium Isotopes
Authors: J.L. Gross and M. Thoennessen
Categories: nucl-ex
Comments: to be published in At. Data. Nucl. Data Tables
\\
  Currently, twenty-eight gallium, thirty-one germanium, thirty-five lutetium,
and thirty-six hafnium isotopes have been observed and the discovery of these
isotopes is discussed here. For each isotope a brief synopsis of the first
refereed publication, including the production and identification method, is
presented.
\\ ( http://arxiv.org/abs/1109.6306 ,  112kb)
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arXiv:1108.6129 (*cross-listing*)
Date: Wed, 31 Aug 2011 05:52:30 GMT   (524kb)
Date (revised v2): Wed, 28 Sep 2011 18:02:43 GMT   (525kb)

Title: Rare dileptonic decays of \Lambda_b in a quark model
Authors: Lonnie Mott and Winston Roberts
Categories: nucl-th hep-ex hep-ph nucl-ex
Comments: Updated info on experimental status and updated references
\\
  Hadronic form factors for the rare weak transitions
$\Lambda_{b}\rightarrow\Lambda^{(*)}$ are calculated using a nonrelativistic
quark model. The form factors are extracted in two ways. An analytic extraction
using single component wave functions (SCA) with the quark current being
reduced to its nonrelativistic Pauli form is employed in the first method. In
the second method, the form factors are extracted numerically using the full
quark model wave function (MCN) with the full relativistic form of the quark
current. Although there are differences between the two sets of form factors,
both sets satisfy the relationships expected from the heavy quark effective
theory (HQET). Differential decay rates, branching ratios and forward-backward
asymmetries (FBAs) are calculated for the dileptonic decays
$\Lambda_{b}\rightarrow\Lambda^{(*)}\ell^{+}\ell^{-}$, for transitions to both
ground state and excited daughter baryons. Inclusion of the long distance
contributions from charmonium resonances significantly enhances the decay
rates. In the MCN model the $\Lambda(1600)$ mode is the dominant mode in the
$\mu$ channel when charmonium resonances are considered; the $\Lambda(1520)$
mode is also found to have a comparable branching ratio to that of the ground
state in the $\mu$ channel.
\\ ( http://arxiv.org/abs/1108.6129 ,  525kb)
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arXiv:1109.6036 (*cross-listing*)
Date: Tue, 27 Sep 2011 21:03:19 GMT   (2734kb,D)

Title: Search for Sterile Neutrinos with a Radioactive Source at Daya Bay
Authors: D.A. Dwyer, K.M. Heeger, B.R. Littlejohn, P. Vogel
Categories: hep-ex nucl-ex
\\
  The far site detector complex of the Daya Bay reactor experiment is proposed
as a location to search for sterile neutrinos with > eV mass. Antineutrinos
from a 500 kCi 144Ce-144Pr beta-decay source (DeltaQ=2.996 MeV) would be
detected by four identical 20-ton antineutrino targets. The site layout allows
flexible source placement; several specific source locations are discussed. In
one year, the 3+1 sterile neutrino hypothesis can be tested at essentially the
full suggested range of the parameters Delta m^2_{new} and sin^22theta_{new}
(90% C.L.). The backgrounds from six nuclear reactors at >1.6 km distance are
shown to be manageable. Advantages of performing the experiment at the Daya Bay
far site are described.
\\ ( http://arxiv.org/abs/1109.6036 ,  2734kb)
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arXiv:1109.6197 (*cross-listing*)
Date: Wed, 28 Sep 2011 13:19:19 GMT   (31kb)

Title: Extracting a free neutron structure function from proton and deuteron
  deep inelastic scattering data
Authors: O. Hen, E. Piasetzky, R. Shneor, L. B. Weinstein, D. W. Higinbotham
Categories: hep-ph nucl-ex nucl-th
Comments: DIS 2011 Conference proceeding
\\
  Due to the lack of a free neutron target the structure function of the
neutron cannot be measured directly and is therefore extracted from deuteron
and proton DIS data. Because the deuteron is a bound nuclear system, in order
to extract the neutron structure function, one needs to apply model dependent
theoretical corrections which dominate the uncertainty at the large xB region.
We present here a correlation between the magnitude of the EMC effect and the
amount of two nucleon Short Range Correlation (2N-SRC) pairs in nuclei. Using
this correlation we propose a phenomenological procedure to extract the free
neutron structure function in the xB range of 0.3 to 0.7.
\\ ( http://arxiv.org/abs/1109.6197 ,  31kb)
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arXiv:1109.6300 (*cross-listing*)
Date: Wed, 28 Sep 2011 19:09:18 GMT   (79kb)

Title: Spectra of Identified Hadrons in Pb-Pb Collisions at LHC
Authors: Rudolph C. Hwa and Lilin Zhu
Categories: nucl-th nucl-ex
Comments: 25 pages, 9 figures
\\
  The transverse momentum distributions of identified hadrons produced in Pb-Pb
collisions at the Large Hadron Collider (LHC) are studied in the low and
intermediate range for $p_T<5$ GeV/c. All four spectra ($\pi, K, p, \Lambda$)
can be well reproduced in the recombination model based on a common thermal
parton distribution of light and strange quarks and on shower partons emitted
in hard and semihard jets. Two essential parameters are adjusted to fit the
data, one being the inverse slope of the thermal distribution and the other
revealing the degree of momentum degradation in the medium. Various
combinations of thermal and shower parton components are calculated, showing
the dominance of minijets. The effect of minijets is to produce harder baryons
than mesons resulting in their ratio to peak at around $p_T \sim 3$ GeV/c.
Substantial portion of the jet energy is found to be lost to the dense medium
before the partons emerge at the surface to undergo hadronization by
recombination.
\\ ( http://arxiv.org/abs/1109.6300 ,  79kb)
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arXiv:1107.4003 (*cross-listing*)
replaced with revised version Tue, 27 Sep 2011 20:52:09 GMT   (708kb)

Title: Selected highlights from the study of mesons
Authors: Lei Chang, Craig D. Roberts and Peter C. Tandy
Categories: nucl-th hep-lat hep-ph nucl-ex
Comments: 28 pages, 15 figures, 2 tables. Version to appear in the Chinese
  Journal of Physics
\\ ( http://arxiv.org/abs/1107.4003 ,  708kb)
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