Mon·Oct 3, 2011Monday·October 3, 2011

1. 01*

   Simulation of Reactors for Antineutrino Experiments Using DRAGON

   L. Winslow🇺🇸

   From the discovery of the neutrino to the precision neutrino oscillation measurements in KamLAND, nuclear reactors have proven to be an important source of antineutrinos. As their power and our knowledge of neutrino physics has increased, more sensitive measurements have become possible. The next generation of reactor antineutrino experiments require more detailed simulations of the reactor core. Many of the reactor simulation codes are proprietary which makes detailed studies difficult. Here we present the results of the open source DRAGON code and compare it to other industry standards for reactor modeling. We use published data from the Takahama reactor to determine the quality of the simulations. The propagation of the uncertainty to the antineutrino flux is also discussed.

   nucl-exhep-ex2 citations
2. 02*

   Measurement of elliptic and higher order flow harmonics at $\sqrt{s_{NN}}=2.76$ TeV Pb+Pb collisions with the ATLAS Detector

   Soumya Mohapatra (for the ATLAS Collaboration)🇺🇸

   The measurements of flow harmonics $v_2$-$v_6$ using the event plane and two particle correlations methods in broad $p_T$, $\eta$ and centrality ranges using the ATLAS detector at LHC are presented. ATLAS recorded about 9 $\mu {\text{b}}^{-1}$ of lead-lead collision data in the 2010 heavy ion run. The full azimuthal acceptance of the ATLAS detector in $\pm 2.5$ units of pseudorapidity for charged hadrons and the large amount of data allows for a detailed study of the flow harmonics. The $p_T$, centrality and $\eta$ ranges where the two methods give consistent $v_n$ and where they disagree are discussed. It is shown that the ridge as well as the so called "mach-cone" seen in two particle correlations are largely accounted for by the collective flow. Some scaling relations in the $p_T$ dependence of the $v_n$ are also discussed.

   nucl-exJ.Phys.Conf.Ser.(2012)·6 citations
3. 03*

   Baryonic resonances close to the Kbar-N threshold: the case of Sigma(1385)^+ in pp collisions

   G.Agakishiev · A.Balanda · D.Belver · A.V.Belyaev · A.Blanco · M.Boehmer · J.L.Boyard · P.Cabanelas · E.Castro · J.C. Chen · S.Chernenko · T.Christ and 90 other authors

   We present results of an exclusive measurement of the first excited state of the Sigma hyperon, Sigma(1385)^+, produced in p+p -> Sigma^+ + K^+ + n at 3.5 GeV beam energy. The extracted data allow to study in detail the invariant mass distribution of the Sigma(1385)^+. The mass distribution is well described by a relativistic Breit-Wigner function with a maximum at m_0 = 1383.2 +- 0.9 MeV/c^2 and a width of 40.2 +- 2.1 MeV/c^2. The exclusive production cross-section comes out to be 22.27 +- 0.89 +- 1.56 +3.07 -2.10 mu b. Angular distributions of the Sigma(1385)^+ in different reference frames are found to be compatible with the hypothesis that 33 % of Sigma(1385)^+ result from the decay of an intermediate Delta^{++} resonance.

   nucl-exPRC(2012)·53 citations
4. 04*

   The Majorana Demonstrator

   E. Aguayo🇺🇸 · J.E. Fast🇺🇸 · E.W. Hoppe🇺🇸 · M.E. Keillor🇺🇸 · J.D. Kephart🇺🇸 · R.T. Kouzes🇺🇸 · B.D. LaFerriere🇺🇸 · J. Merriman🇺🇸 · J.L. Orrell🇺🇸 · N.R. Overman🇺🇸 · F.T. Avignone III🇺🇸 · H.O. Back🇺🇸 and 81 other authors

   A brief review of the history and neutrino physics of double beta decay is given. A description of the MAJORANA DEMONSTRATOR research and development program including background reduction techniques is presented in some detail. The application of point contact (PC) detectors to the experiment is discussed, including the effectiveness of pulse shape analysis. The predicted sensitivity of a PC detector array enriched to 86% in 76Ge is given.

   nucl-ex17 citations
5. 05*

   Constraint on parity-violating muonic forces

   Vernon Barger🇺🇸 · Cheng-Wei Chiang🇹🇼 · Wai-Yee Keung🇺🇸 · Danny Marfatia🇺🇸

   Using the nonobservance of missing mass events in the leptonic kaon decay $K\to \mu X$, we place a strong constraint on exotic parity-violating gauge interactions of the right-handed muon. By way of illustration, we apply it to an explanation of the proton size anomaly that invokes such a new force; scenarios in which the gauge boson decays invisibly or is long-lived are constrained.

   ↳ hep-phhep-exnucl-exnucl-thPRL(2012)·86 citations
6. 06*

   A pivotal year for Generalized Parton Distributions

   H. Moutarde🇫🇷 · J. Ball🇫🇷 · G. Charles🇫🇷 · B. Moreno🇫🇷 · F. Sabatié🇫🇷 · S. Procureur🇫🇷

   The field of Generalized Parton Distribution (GPD) benefited from a wealth of exclusive reactions measurements since 2000. Extraction of GPDs from observables has begun with this first generation of experiments. In the short and mid-term future the programs of COMPASS-II and JLab at 12 GeV will enlarge the existing kinematic domain and open an era of high-precision measurements. Tools for phenomenological analysis are being developed at the same time and will be mature to handle these forthcoming measurements. In the long-term future the EIC project will allow an ambitious spin program in the small to intermediate $x_B$ domain.

   ↳ hep-phnucl-ex0 citations
7. 07*

   Tuning of the GEANT4 FRITIOF (FTF) Model Using NA61/SHINE Experimental Data

   V. Uzhinsky🇨🇭

   The NA61/SHINE collaboration measured inclusive cross sections of \pi^+ and \pi^- meson production in the interactions of 31 GeV/c protons with carbon nuclei at forward emission angles (0 - 420 mrad). The collaboration also presented predictions of Monte Carlo models - FLUKA, VENUS and UrQMD, in comparison with the data. A careful analysis shows that deviations of the FLUKA and VENUS predictions from the data have different tendencies. The worst description of the data was observed for the UrQMD model results. All the models assume the creation of quark-gluon strings in the interactions, but it is complicated to analyze the models in order to find the source of the deviations. Thus, the quark-gluon string model - FRITIOF (FTF) - was implemented in the GEANT4 toolkit and is used to understand the deviations mentioned above. It was found that the most important factor influencing the FTF calculations is the sampling of quark-gluon string masses. The other factors/parameters are not essential for a description of the data. Also, a good description of the data is achieved by the FTF model.

   ↳ hep-phhep-exnucl-exnucl-th13 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.