Tue·Oct 11, 2016Tuesday·October 11, 2016

1. 01*

   The PANDA Experiment at FAIR - Subatomic Physics with Antiprotons

   Johan Messchendorp (on behalf of the PANDA Collaboration)🇳🇱

   The non-perturbative nature of the strong interaction leads to spectacular phenomena, such as the formation of hadronic matter, color confinement, and the generation of the mass of visible matter. To get deeper insight into the underlying mechanisms remains one of the most challenging tasks within the field of subatomic physics. The antiProton ANnihilations at DArmstadt (PANDA) collaboration has the ambition to address key questions in this field by exploiting a cooled beam of antiprotons at the High Energy Storage Ring (HESR) at the future Facility for Antiproton and Ion Research (FAIR) combined with a state-of-the-art and versatile detector. This contribution will address some of the unique features of PANDA that give rise to a promising physics program together with state-of-the-art technological developments.

   nucl-exJPS Conf.Proc.(2017)·9 citations
2. 02*

   Multiplicity dependence of light flavour hadron production at LHC energies in the strangeness canonical suppression picture

   Vytautas Vislavicius🇸🇪 · Alexander Kalweit🇨🇭

   We present an analysis of data on light flavour hadron production as function of event multiplicity at LHC energies measured by the ALICE collaboration. The strangeness-canonical approach within the framework of the THERMUS statistical hadronisation model is used for a simultaneous description of pp, p-Pb, and Pb-Pb collisions. The rapidity window dependence of the strangeness correlation volume is addressed and a value of $\Delta y=1.33\pm 0.28$ is found. With the exception of the $\varphi$-meson, an excellent description of the experimental data is found.

   nucl-exhep-ph43 citations
3. 03*

   Beta-decay study of $T_z=-2$ proton-rich nucleus ${}^{20}$Mg

   L. J. Sun🇨🇳 · X. X. Xu🇨🇳 · C. J. Lin · J. S. Wang🇨🇳 · D. Q. Fang🇨🇳 · Z. H. Li · Y. T. Wang · J. Li🇨🇳 · L. Yang🇺🇸 · N. R. Ma · K. Wang🇺🇸 · H. L. Zang🇨🇳 and 23 other authors

   The $\beta$ decay of the drip-line nucleus ${}^{20}$Mg gives important information on resonances in ${}^{20}$Na, which are relevant for the astrophysical $rp$-process. A detailed $\beta$ decay spectroscopic study of ${}^{20}$Mg was performed by a continuous-implantation method. A detection system was specially developed for charged-particle decay studies, giving improved spectroscopic information including the half-life of ${}^{20}$Mg, the excitation energies, the branching ratios, and the log $ft$ values for the states in ${}^{20}$Na populated in the $\beta$ decay of ${}^{20}$Mg. A new proton branch was observed and the corresponding excited state in ${}^{20}$Na was proposed. The large isospin asymmetry for the mirror decays of ${}^{20}$Mg and ${}^{20}$O was reproduced, as well. However, no conclusive conclusion can be draw about the astrophysically interesting 2645~keV resonance in ${}^{20}$Na due to the limited statistics.

   nucl-exPRC(2017)·21 citations
4. 04*

   Identified particle production in pp collisions at $\sqrt{s}=$ 7 and 13 TeV measured with ALICE

   Rafael Derradi de Souza (for the ALICE Collaboration)🇧🇷

   Proton-proton (pp) collisions have been used extensively as a reference for the study of interactions of larger colliding systems at the LHC. Recent measurements performed in high-multiplicity pp and proton-lead (p-Pb) collisions have shown features that are reminiscent of those observed in lead-lead (Pb-Pb) collisions. In this context, the study of identified particle spectra and yields as a function of multiplicity is a key tool for the understanding of similarities and differences between small and large systems. We report on the production of pions, kaons, protons, $K_{\mathrm{S}}^0$, $\Lambda$, $\Xi$, $\Omega$ and $K^{\ast 0}$ as a function of multiplicity in pp collisions at $\sqrt{s}=$ 7 TeV measured with the ALICE experiment. The work presented here represents the most comprehensive set of results on identified particle production in pp collisions at the LHC. Spectral shapes, studied both for individual particles and via particle ratios as a function of $p_{\mathrm{T}}$, exhibit an evolution with charged particle multiplicity that is similar to the one observed in larger systems. In addition, results on the production of light flavour hadrons in pp collisions at $\sqrt{s}=$ 13 TeV, the highest centre-of-mass energy ever reached in the laboratory, are also presented and compared with previous, lower energy results.

   ↳ hep-exnucl-exJ.Phys.Conf.Ser.(2017)·7 citations
5. 05*

   The role of meson exchange currents in charged current (anti)neutrino-nucleus scattering

   M.B. Barbaro🇮🇹 · J.E. Amaro🇪🇸 · J.A. Caballero🇪🇸 · A. De Pace🇮🇹 · T.W. Donnelly🇺🇸 · G.D. Megias🇪🇸 · I. Ruiz Simo🇪🇸

   We present our recent progress in the description of neutrino-nucleus interaction in the GeV region, of interest for ongoing and future oscillation experiments. In particular, we discuss the weak excitation of two-particle-two-hole states induced by meson exchange currents in a fully relativistic framework. We compare the results of our model with recent measurements of neutrino scattering cross sections, showing the crucial role played by two-nucleon knockout in the interpretation of the data.

   ↳ nucl-thhep-phnucl-exNucl.Theor.(2016)·6 citations
6. 06*

   Delayed charge recovery discrimination of passivated surface alpha events in P-type point-contact detectors

   J. Gruszko · N. Abgrall · I.J. Arnquist · F.T. Avignone III · A.S. Barabash · F.E. Bertrand · A.W. Bradley · V. Brudanin · M. Busch · M. Buuck · T.S. Caldwell · Y-D. Chan and 56 other authors

   The Majorana Demonstrator searches for neutrinoless double-beta decay of ${}^{76}$Ge using arrays of high-purity germanium detectors. If observed, this process would demonstrate that lepton number is not a conserved quantity in nature, with implications for grand-unification and for explaining the predominance of matter over antimatter in the universe. A problematic background in such large granular detector arrays is posed by alpha particles. In the Majorana Demonstrator, events have been observed that are consistent with energy- degraded alphas originating on the passivated surface, leading to a potential background contribution in the region-of-interest for neutrinoless double-beta decay. However, it is also observed that when energy deposition occurs very close to the passivated surface, charges drift through the bulk onto that surface, and then drift along it with greatly reduced mobility. This leads to both a reduced prompt signal and a measurable change in slope of the tail of a recorded pulse. In this contribution we discuss the characteristics of these events and the development of a filter that can identify the occurrence of this delayed charge recovery, allowing for the efficient rejection of passivated surface alpha events in analysis.

   ↳ physics.ins-detnucl-exJ.Phys.Conf.Ser.(2017)·13 citations
7. 07*

   Determination of the event collision time with the ALICE detector at the LHC

   ALICE Collaboration

   Particle identification is an important feature of the ALICE detector at the LHC. In particular, for particle identification via the time-of-flight technique, the precise determination of the event collision time represents an important ingredient of the quality of the measurement. In this paper, the different methods used for such a measurement in ALICE by means of the T0 and the TOF detectors are reviewed. Efficiencies, resolution and the improvement of the particle identification separation power of the methods used are presented for the different LHC colliding systems (pp , p-Pb and Pb-Pb) during the first period of data taking of LHC (Run 1).

   ↳ physics.ins-detnucl-exEur.Phys.J.Plus(2017)·99 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.