Mon·Apr 25, 2016Monday·April 25, 2016

1. 01*

   Update on nuclear structure effects in light muonic atoms

   Oscar Javier Hernandez🇨🇦 · Nir Nevo Dinur🇨🇦 · Chen Ji🇨🇦 · Sonia Bacca🇨🇦 · Nir Barnea🇮🇱

   We present calculations of the nuclear structure corrections to the Lamb shift in light muonic atoms, using state-of-the-art nuclear potentials. We outline updated results on finite nucleon size contributions.

   ↳ nucl-thnucl-exHyperfine Interact.(2016)·18 citations
2. 02*

   Luneburg-lens-like universal structural Pauli attraction in nucleus-nucleus interactions: origin of emergence of cluster structures and nuclear rainbows

   Shigeo Ohkubo🇯🇵

   The Pauli exclusion principle plays an important role in many-body fermion systems preventing them from collapsing by repulsion. For example, the Pauli principle causes a repulsive potential at short distances between two $\alpha$ particles. On the other hand, the existence of nuclear rainbows demonstrates that the inter-nuclear potential is sufficiently attractive in the internal region to cause refraction. The two concepts of repulsion and attraction are seemingly irreconcilable. Contrary to traditional understanding, it is shown that the Pauli principle causes a {\it universal structural Pauli attraction} between nuclei rather than a {\it structural repulsive core}. Through systematic studies of $\alpha$+$\alpha$, $\alpha$+${}^{16}$O, $\alpha$+${}^{40}$Ca and ${}^{16}$O+${}^{16}$O systems, it is shown that the emergence of cluster structures near the threshold energy at low energies and nuclear rainbows at high energies is a direct consequence of the Pauli principle.

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

   Exploring universality of transversity in proton-proton collisions

   Marco Radici🇮🇹 · Alessandro M. Ricci🇮🇹 · Alessandro Bacchetta🇮🇹 · Asmita Mukherjee🇮🇳

   We consider the azimuthal correlations of charged hadron pairs with large total transverse momentum and small relative momentum, produced in proton-proton collisions with one transversely polarized proton. One of these correlations directly probes the chiral-odd transversity parton distribution in connection with a chiral-odd interference fragmentation function. We present predictions for this observable based on previous extractions of transversity (from charged pion pair production in semi-inclusive deep-inelastic scattering) and of the interference fragmentation function (from the production of back-to-back charged pion pairs in electron-positron annihilations). All analyses are performed in the framework of collinear factorization. We compare our predictions to the recent data on proton-proton collisions released by the STAR collaboration at RHIC, and we find them reasonably compatible. This comparison confirms for the first time the predicted role of transversity in proton-proton collisions and it allows to test its universality.

   ↳ hep-phhep-exnucl-exnucl-thPRD(2016)·41 citations
4. 04*

   On Single Particle Energies and Nuclear g Factors

   Shadow Robinson · Larry Zamick🇺🇸

   If we add one neutron to doubly magic ^{100}Sn, we can associate the low lying states in^{101} Sn with single particle states.The the J=5/2^{+} and J= 7/2^{+} states are identified as d_{5/2}and g_{7/2}states respectively...They are separated by an energy of 0.18 MeV.Unfortunately there is a disputeas to the ordering of these states.We examine how the 2 scenarios-- J=5/2^{+} ground state or J=7/2^{+}ground state-- affect spectra of higher Sn isotopes .

   ↳ nucl-thnucl-exIJMPE(2017)·2 citations
5. 05*

   Octupole correlations in the nucleus ${}^{144}$Ba described with symmetry conserving configuration mixing calculations

   Rémi N. Bernard🇫🇷 · Luis M. Robledo🇪🇸 · Tomás R. Rodríguez🇪🇸

   We study the interplay of quadrupole and octupole degrees of freedom in the structure of the isotope ${}^{144}$Ba. A symmetry conserving configuration mixing method (SCCM) based on a Gogny energy density functional (EDF) has been used. The method includes particle number, parity and angular momentum restoration as well as axial quadrupole and octupole shape mixing within the generator coordinate method. Predictions both for excitation energies and electromagnetic transition probabilities are in good agreement with the most recent experimental data.

   ↳ nucl-thnucl-exPRC(2016)·53 citations
6. 06*

   Strangeness production as a function of charged particle multiplicity in proton-proton collisions

   Livio Bianchi (for the ALICE Collaboration)🇺🇸

   Recent measurements performed in high-multiplicity proton-proton (pp) and proton-lead (p-Pb) collisions have shown features that are reminiscent of those observed in lead-lead (Pb-Pb) collisions. These observations warrant a comprehensive measurement of the production of identified particles. We report on the production of \allparts at mid-rapidity measured as a function of multiplicity in pp collisions at $\sqrt{s}$ = 7 TeV with the ALICE experiment. Spectral shapes studied both for individual particles and via particle ratios such as ($\Lambda /K_S^0$) as a function of $p_T$ exhibit an evolution with event multiplicity and the production rates of hyperons are observed to increase more strongly than those of non-strange hadrons. These phenomena are qualitatively similar to the ones observed in p-Pb and Pb-Pb collisions.

   ↳ hep-exnucl-exNPA(2016)·15 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.