Thu·Sep 1, 2016Thursday·September 1, 2016

1. 01*

   Proton distribution radii of ${}^{12-19}$C illuminate features of neutron halos

   R. Kanungo🇨🇦 · W. Horiuchi🇯🇵 · G. Hagen🇺🇸 · G. R. Jansen🇺🇸 · P. Navratil🇨🇦 · F. Ameil🇩🇪 · J. Atkinson · Y. Ayyad🇯🇵 · D. Cortina-Gil🇪🇸 · I. Dillmann🇨🇦 · A. Estradé🇬🇧 · A. Evdokimov and 26 other authors

   Proton radii of ${}^{12-19}$C densities derived from first accurate charge changing cross section measurements at 900$A$ MeV with a carbon target are reported. A thick neutron surface evolves from $\sim$ 0.5 fm in ${}^{15}$C to $\sim$ 1 fm in ${}^{19}$C. The halo radius in ${}^{19}$C is found to be 6.4$\pm$0.7 fm as large as ${}^{11}$Li. Ab initio calculations based on chiral nucleon-nucleon and three-nucleon forces reproduce well the radii.

   nucl-exnucl-thPRL(2016)·113 citations
2. 02*

   K-Long Facility for JLab and its Scientific Potential

   Igor I. Strakovsky🇺🇸

   Our main interest in creating a secondary high-quality KL-beam is to investigate hyperon spectroscopy through both formation and production processes. We propose to study two-body reactions induced by the KL-beam on the proton target. The experiment should measure both differential cross sections and self-analyzed polarizations of the produced $\Lambda$-, $\Sigma$-, and $\Xi$-hyperons using the GlueX detector at the Jefferson Lab Hall D. New data will greatly constrain partial-wave analysis and reduce model-dependent uncertainties in the extraction of strange resonance properties, providing a new benchmark for comparisons with QCD-inspired models and LQCD calculations. The measurements will span c.m. $\cos \theta$ from -0.95 to 0.95 in c.m. range above W = 1490MeV and up to 4000 MeV.

   nucl-exhep-exhep-phnucl-thEPJ Web Conf.(2016)·2 citations
3. 03*

   Two-Particle Correlations in Heavy-Light Ion Collisions

   Douglas E. Wertepny🇺🇸

   We study the initial, high-energy scatterings in heavy ion collisions using the saturation/Color Glass Condensate framework. We focus on two-particle long-range rapidity correlations which are modeled as two-gluon correlations. We calculate the two-gluon production cross section using the saturation framework in the heavy-light ion regime, including all-order saturation effects in the heavy nucleus while considering only two-orders in the light ion. The two-gluon production cross section generates four types of long-range in rapidity correlations: (i) geometric correlations, (ii) Hanbury Brown and Twiss (HBT) like correlations accompanied by a back-to-back maximum, (iii) near-side correlations, and (iv) away-side azimuthal correlations. The geometric correlations (i) are due to the fact that nucleons are correlated by simply being confined within the same nucleus. Correlations (iii) and (iv) have exactly the same amplitudes along with azimuthal and rapidity shapes: one centered around $\Delta \varphi =0$ and the other one centered around $\Delta \varphi =\pi$ (here $\Delta \varphi$ is the azimuthal angle between the two produced gluons). The geometry dependence of the correlation function leads to stronger azimuthal near- and away-side correlations in the tip-on-tip U+U collisions than in the side-on-side U+U collisions, an exactly opposite behavior from the correlations generated by the elliptic flow of the quark-gluon plasma: a study of azimuthal correlations in the U+U collisions may help to disentangle the two sources of correlations. Finally we rewrite our result for the two-gluon production cross-section in a $k_T$-factorized form resulting in an expression involving a convolution of one- and two-gluon Wigner distributions over the transverse momenta and impact parameters. This differs from the $k_T$-factorized forms used in the literature.

   ↳ nucl-thhep-phnucl-ex1 citation
4. 04*

   Dark Sectors 2016 Workshop: Community Report

   Jim Alexander🇺🇸 · Marco Battaglieri🇮🇹 · Bertrand Echenard🇺🇸 · Rouven Essig🇺🇸 · Matthew Graham🇺🇸 · Eder Izaguirre🇨🇦 · John Jaros🇺🇸 · Gordan Krnjaic🇺🇸 · Jeremy Mardon🇺🇸 · David Morrissey🇨🇦 · Tim Nelson🇺🇸 · Maxim Perelstein🇺🇸 and 192 other authors

   This report, based on the Dark Sectors workshop at SLAC in April 2016, summarizes the scientific importance of searches for dark sector dark matter and forces at masses beneath the weak-scale, the status of this broad international field, the important milestones motivating future exploration, and promising experimental opportunities to reach these milestones over the next 5-10 years.

   ↳ hep-phastro-ph.COhep-exnucl-ex743 citations
5. 05*

   The light-yield response of a NE-213 liquid-scintillator detector measured using 2 -- 6 MeV tagged neutrons

   J. Scherzinger🇸🇪 · R. Al Jebali🇬🇧 · J.R.M. Annand🇬🇧 · K.G. Fissum🇸🇪 · R. Hall-Wilton🇸🇪 · K. Kanaki🇩🇰 · M. Lundin🇸🇪 · B. Nilsson · H. Perrey🇸🇪 · A. Rosborg · H. Svensson

   The response of a NE-213 liquid-scintillator detector has been measured using tagged neutrons from 2--6 MeV originating from an Am/Be neutron source. The neutron energies were determined using the time-of-flight technique. Pulse-shape discrimination was employed to discern between gamma-rays and neutrons. The behavior of both the fast (35 ns) and the combined fast and slow (475 ns) components of the neutron scintillation-light pulses were studied. Three different prescriptions were used to relate the neutron maximum energy-transfer edges to the corresponding recoil-proton scintillation-light yields, and the results were compared to simulations. Parametrizations which predict the fast or total light yield of the scintillation pulses were also tested. Our results agree with both existing data and existing parametrizations. We observe a clear sensitivity to the portion and length of the neutron scintillation-light pulse considered.

   ↳ physics.ins-detnucl-exNucl.Instrum.Meth.A(2016)·13 citations
6. 06*

   Interplay of projectile breakup and target excitation in reactions induced by weakly-bound nuclei

   M. Gomez-Ramos🇪🇸 · A. M. Moro🇪🇸

   In this work, we reexamine the extension of the CDCC formalism to include target excitation and apply it to a variety of reactions to study the effect of breakup on inelastic cross sections. We use a transformed oscillator basis to discretize the continuum of the projectiles in the different reactions and use the extended CDCC method developed in this work to solve the resulting coupled differential equations. A new code has been developed to perform the calculations. Reactions 58Ni(d, d) 58Ni*, 24Mg(d, d) 24Mg* , 144Sm( 6Li, 6Li) 144Sm* and 9Be( 6Li, 6Li) 9Be* are studied. Satisfactory agreement is found between experimental data and extended CDCC calculations. The studied CDCC method is proved to be an accurate tool to describe target excitation in reactions with weakly-bound nuclei. Moderate effects of breakup on inelastic observables are found for the reactions studied. Cross section magnitudes are not modified much, but angular distributions present smoothing when opposed to calculations without breakup.

   ↳ nucl-thnucl-exPRC(2017)·25 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.