Mon·Oct 2, 2017Monday·October 2, 2017

1. 01*

   Perturbed angular distributions with LaBr${}_3$ detectors: the $g$ factor of the first $10^{+}$ state in ${}^{110}$Cd revisited

   T.J. Gray🇦🇺 · A.E. Stuchbery🇦🇺 · M.W. Reed🇦🇺 · A. Akber🇦🇺 · B.J. Coombes🇦🇺 · J.T.H. Dowie🇦🇺 · T.K. Eriksen🇳🇴 · M.S.M. Gerathy🇦🇺 · T. Kibedi🇦🇺 · G.J. Lane🇦🇺 · A.J. Mitchell🇬🇧 · T. Palazzo · T. Tornyi🇳🇴

   The Time Differential Perturbed Angular Distribution technique with LaBr${}_3$ detectors has been applied to the $I^{\pi }={\frac{11}{2}}^{-}$ isomeric state ($E_x=846$ keV, $\tau =107$~ns) in ${}^{107}$Cd, which was populated and recoil-implanted into a gadolinium host following the ${}^{98}$Mo(${}^{12}$C, $3n$)${}^{107}$Cd reaction. The static hyperfine field strength of Cd recoil implanted into gadolinium was thus measured, together with the fraction of nuclei implanted into field-free sites, under similar conditions as pertained for a previous implantation perturbed angular distribution $g$-factor measurement on the $I^{\pi }=10^{+}$ state in ${}^{110}$Cd. The ${}^{110}$Cd $g(10^{+})$ value was thereby re-evaluated, bringing it into agreement with the value expected for a seniority-two $\nu h_{\frac{11}{2}}$ configuration.

   nucl-exPRC(2017)·6 citations
2. 02*

   New results on fluctuations and correlations from the NA61/SHINE experiment at the CERN SPS

   Katarzyna Grebieszkow (for the NA61/SHINE Collaboration)🇵🇱

   The exploration of the QCD phase diagram is the most important task of present heavy ion experiments. In particular, we want to study the phase transition from hadronic to partonic matter and look for the critical point (CP) of strongly interacting matter. Fluctuations and correlations in kinematic characteristics and particle yields may help to locate the CP (in analogy to enlarged fluctuations due to critical opalescence close to a CP in a liquid/gas transition). The strong interactions program of the NA61/SHINE experiment may allow to discover or rule out the existence of the CP in the Super Proton Synchrotron energy domain. For this purpose we perform a two-dimensional scan by varying the energy ($5.1<\sqrt{s_{NN}}<16.8/17.3$ GeV) and the system size (p+p, p+Pb, Be+Be, Ar+Sc, Xe+La, Pb+Pb) of the collisions. In this report new NA61/SHINE results on fluctuations and correlations in p+p, Be+Be, and Ar+Sc collisions are presented. In particular, results on transverse momentum and multiplicity fluctuations, as well as higher order moments of net-charge fluctuations are discussed. The NA61/SHINE data are compared to predictions of string hadronic models and to NA49 results.

   nucl-exhep-exPoS(2017)·7 citations
3. 03*

   Difference in proton radii of mirror nuclei as a possible surrogate for the neutron skin

   Junjie Yang🇺🇸 · J. Piekarewicz🇺🇸

   It has been recently suggested that differences in the charge radii of mirror nuclei are proportional to the neutron-skin thickness of neutron-rich nuclei and to the slope of the symmetry energy $L$ [B.A. Brown Phys. Rev. Lett. 119, 122502 (2017)]. The determination of the neutron skin has important implications for nuclear physics and astrophysics. Although the use of electroweak probes provides a largely model-independent determination of the neutron skin, the experimental challenges are enormous. Thus, the possibility that differences in the charge radii of mirror nuclei may be used as a surrogate for the neutron skin is a welcome alternative. To test the validity of this assumption we perform calculations based on a set of relativistic energy density functionals that span a wide region of values of $L$. Our results confirm that the difference in charge radii of various neutron-deficient nickel isotopes and their corresponding mirror nuclei is indeed strongly correlated to both the neutron-skin thickness and $L$. Moreover, given that various neutron-star properties are also sensitive to $L$, a data-to-data relation emerges between the difference in charge radii of mirror nuclei and the radius of low-mass neutron stars.

   ↳ nucl-thastro-ph.SRnucl-exPRC(2018)·52 citations
4. 04*

   Technical Design Report for the PANDA Barrel DIRC Detector

   PANDA Collaboration

   This documents describes the technical design and the expected performance of the Barrel DIRC detector for the PANDA experiment. The Barrel DIRC will provide hadronic charged particle identification in the polar angle range of $22^{\circ }$ to $140^{\circ }$ for particle momenta between 0.5 GeV/c and 3.5 GeV/c. The design is based on the successful BaBar DIRC with several key improvements. The performance and system cost were optimized in detailed detector simulations and validated with full system prototypes using particle beams at GSI and CERN. The final design meets or exceeds the PID goal of clean $\pi /K$ separation with at least 3 standard deviations over the entire phase space of charged kaons in the Barrel DIRC.

   ↳ physics.ins-dethep-exnucl-ex25 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.