Tue·Jun 7, 2016Tuesday·June 7, 2016

1. 01*

   Optical model potential of deuteron with $1p$-shell nuclei

   Y. Zhang🇨🇳 · D.Y. Pang🇨🇳 · J.L. Lou🇨🇳

   A set of global optical potential parameters, DA1p, for deuterons with the $1p$-shell nuclei is obtained by simultaneously fitting 67 sets of experimental data of deuteron elastic scattering from \nuc{6}{Li}, \nuc{9}{Be}, \nuc{10}{B}, \nuc{11}{B}, \nuc{12}{C}, \nuc{13}{C}, \nuc{14}{N}, \nuc{16}{O} and \nuc{18}{O} with incident energies between 5.25 and 170 MeV. DA1p improves the description of the deuteron elastic scattering from the $1p$-shell nuclei with respect to the existing systematic deuteron potentials and can give satisfactory reproduction to the experimental data with radiative nuclei such as \nuc{9}{Li}, \nuc{10}{Be}, \nuc{14}{C} and \nuc{14}{O}.

   nucl-exnucl-thPRC(2016)·40 citations
2. 02*

   Geometrical symmetries of nuclear systems: D(3h) and T(d) symmetries in light nuclei

   Roelof Bijker🇲🇽

   The role of discrete (or point-group) symmetries in alpha-cluster nuclei is discussed in the framework of the algebraic cluster model which describes the relative motion of the alpha-particles. Particular attention is paid to the discrete symmetry of the geometric arrangement of the alpha-particles, and the consequences for the structure of the corresponding rotational bands. The method is applied to study cluster states in the nuclei 12C and 16O. The observed level sequences can be understood in a simple way as a consequence of the underlying discrete symmetry that characterizes the geometrical configuration of the alpha-particles, i.e. an equilateral triangle with D(3h) symmetry for 12C, and a tetrahedron with T(d) symmetry for 16O. The structure of rotational bands provides a fingerprint of the underlying geometrical configuration of alpha-particles.

   ↳ nucl-thnucl-exPhys.Scripta(2016)·13 citations
3. 03*

   An ultracold neutron storage bottle for UCN density measurements

   G. Bison🇨🇭 · F. Burri🇨🇭 · M. Daum🇨🇭 · K. Kirch🇨🇭 · J. Krempel🇨🇭 · B. Lauss🇨🇭 · M. Meier🇩🇪 · D. Ries🇨🇭 · P. Schmidt-Wellenburg🇨🇭 · G. Zsigmond🇨🇭

   We have developed a storage bottle for ultracold neutrons (UCN) in order to measure the UCN density at the beamports of the Paul Scherrer Institute's (PSI) UCN source. This paper describes the design, construction and commissioning of the robust and mobile storage bottle with a volume comparable to typical storage experiments 32 liter e.g. searching for an electric dipole moment of the neutron.

   ↳ physics.ins-detnucl-exNucl.Instrum.Meth.A(2016)·10 citations
4. 04*

   Measurements of double-helicity asymmetries in inclusive $J/\psi$ production in longitudinally polarized $p+p$ collisions at $\sqrt{s}=510$ GeV

   A. Adare · C. Aidala · N.N. Ajitanand · Y. Akiba · R. Akimoto · M. Alfred · N. Apadula · Y. Aramaki · H. Asano · E.T. Atomssa · T.C. Awes · B. Azmoun and 324 other authors

   We report the double helicity asymmetry, $A_{LL}^{J/\psi }$, in inclusive $J/\psi$ production at forward rapidity as a function of transverse momentum $p_T$ and rapidity $|y|$. The data analyzed were taken during $\sqrt{s}=510$ GeV longitudinally polarized $p$$+$$p$ collisions at the Relativistic Heavy Ion Collider (RHIC) in the 2013 run using the PHENIX detector. At this collision energy, $J/\psi$ particles are predominantly produced through gluon-gluon scatterings, thus $A_{LL}^{J/\psi }$ is sensitive to the gluon polarization inside the proton. We measured $A_{LL}^{J/\psi }$ by detecting the decay daughter muon pairs ${\mu }^{+}{\mu }^{-}$ within the PHENIX muon spectrometers in the rapidity range $1.2<|y|<2.2$. In this kinematic range, we measured the $A_{LL}^{J/\psi }$ to be $0.012\pm 0.010$~(stat)~$\pm$~$0.003$(syst). The $A_{LL}^{J/\psi }$ can be expressed to be proportional to the product of the gluon polarization distributions at two distinct ranges of Bjorken $x$: one at moderate range $x\approx 0.05$ where recent RHIC data of jet and ${\pi }^0$ double helicity spin asymmetries have shown evidence for significant gluon polarization, and the other one covering the poorly known small-$x$ region $x\approx 2\times 10^{-3}$. Thus our new results could be used to further constrain the gluon polarization for $x<0.05$.

   ↳ hep-exnucl-exPRD(2016)·22 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.