Mon·Jul 30, 2018Monday·July 30, 2018

1. 01*

   Balance functions of (un)identified hadrons in Pb--Pb, p--Pb, and pp collisions at the LHC

   Jinjin Pan (for the ALICE Collaboration)🇺🇸

   In ultrarelativistic heavy-ion collisions, correlations of particles with opposite quantum numbers provide insight into quark production mechanisms and time scales, collective motion, and re-scattering in the hadronic phase. The longitudinal and azimuthal widths of balance functions for charged kaons and charged pions are used to examine the two-wave quark production model proposed to explain quark-antiquark production within the QGP, which predicts a large increase in up and down quark pairs relative to strange quark pairs around the time of hadronization. Balance functions are also analyzed in small collision systems such as p--Pb and pp to study fragmentation effects and possible collective effects in high-multiplicity events. A comprehensive set of balance functions has been measured using the ALICE detector, including results for unidentified hadrons in Pb--Pb and p--Pb collisions at $\sqrt{s_{\mathrm{NN}}}=5.02$ TeV, for charged pions in Pb--Pb collisions at $\sqrt{s_{\mathrm{NN}}}=2.76$ TeV, p--Pb collisions at $\sqrt{s_{\mathrm{NN}}}=5.02$ TeV and pp collisions at $\sqrt{s}=7$ TeV, and for charged kaons in Pb--Pb collisions at $\sqrt{s_{\mathrm{NN}}}=2.76$ TeV. The first balance function yield results are also presented.

   nucl-exNPA(2019)·10 citations
2. 02*

   $\mathbf{\gamma }$-vibration in ${}^{198}$Hg

   S. Chakraborty🇮🇳 · H. P. Sharma🇮🇳 · S. S. Tiwary🇮🇳 · C. Majumder🇮🇳 · P. Banerjee🇮🇳 · S. Ganguly🇮🇳 · S. Muralithar🇮🇳 · R. P. Singh🇮🇳 · G. H. Bhat🇮🇳 · J. A. Sheikh🇮🇳 · R. Palit🇮🇳

   Low lying states of ${}^{198}$Hg have been investigated via ${}^{197}$Au(${}^7$Li, $\alpha$2n$\gamma$)${}^{198}$Hg reaction at E${}_{\text{beam}}$ = 33 MeV and 38 MeV and the members of $\gamma$-vibrational band have been identified. Results are compared with the systematic of this mass region and found in agreement. Observed band structures have been interpreted using the theoretical framework of microscopic triaxial projected shell model (TPSM) approach and it is shown that TPSM results are in fair agreement with the observed energies.

   nucl-exnucl-thEPJA(2019)·9 citations
3. 03*

   Search for the critical point by the NA61/SHINE experiment

   Evgeny Andronov (for the NA61/SHINE Collaboration)🇷🇺

   NA61/SHINE is a fixed target experiment operating at CERN SPS. Its main goals are to search for the critical point of strongly interacting matter and to study the onset of deconfinement. For these goals a scan of the two dimensional phase diagram ($T$-${\mu }_B$) is being performed at the SPS by measurements of hadron production in proton-proton, proton-nucleus and nucleus-nucleus interactions as a function of collision energy. In this paper the status of the search for the critical point of strongly interacting matter by the NA61/SHINE Collaboration is presented including recent results on proton intermittency, strongly intensive fluctuation observables of multiplicity and transverse momentum fluctuations. These measurements are expected to be sensitive to the correlation length and, therefore, have the ability to reveal the existence of the critical point via possible non-monotonic behavior. The new NA61/SHINE results are compared to the model predictions.

   nucl-exNPA(2019)·18 citations
4. 04*

   Fast Neutron Detection Efficiency of 6Li and 7Li Enriched CLYC Scintillators using an Am-Be source

   N. Blasi🇮🇹 · S. Brambilla🇮🇹 · F. Camera🇮🇹 · S. Ceruti🇮🇹 · A. Giaz · L. Gini · F. Groppi · S.Manenti · A. Mentana · B. Million🇮🇹 · S. Riboldi🇮🇹

   The fast neutrons produced by a calibrated 241Am-Be source were detected by two different Cs2LiYCl6:Ce (CLYC) scintillator detectors. The two cylindrical crystals (1"x1" in size) were enriched with more than 99% of 7Li (C7LYC) and with about 95% of 6Li (C6LYC), respectively. Both crystals can detect fast neutrons whereas only C6LYC can also detect thermal neutrons, due to the presence of 6Li. The measurement was performed at the L.A.S.A. Laboratory of INFN and University of Milano (Italy). To identify the neutron events, the Pulse-Shape-Discrimination technique was used. A value for the detection efficiency of the 241Am-Be emitted neutrons, with energy up to 10 MeV, was deduced.

   ↳ physics.ins-detnucl-exJINST(2018)·3 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.