Tue·Mar 20, 2018Tuesday·March 20, 2018

1. 01*

   Exclusive vector meson production at an electron-ion collider

   Michael Lomnitz🇺🇸 · Spencer Klein🇺🇸

   Coherent exclusive vector meson electroproduction is a key physics channel at an electron-ion collider. It probes the gluon structure of nuclei over a wide range of $Q^2$, and can be used to measure nuclear shadowing and to search for gluon saturation and/or the colored glass condensate. In this paper, we present calculations of the kinematic distributions for a variety of exclusive vector meson final states: the $\rho$, $\varphi$, J/$\psi$, ${\psi }^{\prime }$ and the ${\rm Y}$ states. The cross-sections for light and $c\overline{c}$ mesons are large, while ${\rm Y}$ states should be produced in moderate numbers at a medium energy EIC (the proposed U.S. designs) and in large numbers at the LHeC. We investigate the acceptances for these states, as a function of detector rapidity coverage. A large-acceptance detector is needed to cover the full range photon-nucleon collision energies produced at an EIC; a forward detector is required to observe vector mesons from the most energetic photon interactions, and thereby probe gluons at the lowest possible Bjorken-$x$ values.

   nucl-exhep-phnucl-thPRC(2019)·55 citations
2. 02*

   Proton-${\eta }^{\prime }$ interactions at threshold

   A. V. Anisovich🇩🇪 · V. Burkert🇺🇸 · M. Dugger🇺🇸 · E. Klempt🇩🇪 · V. A. Nikonov🇩🇪 · B. G. Ritchie🇺🇸 · A. V. Sarantsev🇩🇪 · U. Thoma🇩🇪

   Recent data on photoproduction of ${\eta }^{\prime }$ mesons off protons have been included in the data base for the Bonn-Gatchina partial wave analysis. The real and imaginary parts of the $S$-wave ${\eta }^{\prime }p\to {\eta }^{\prime }p$ scattering amplitude in the threshold region were fit to yield the ${\eta }^{\prime }p$ scattering length and the interaction range. This new analysis found $|a_{{\eta }^{\prime }p}|=(0.403\pm 0.015\pm 0.060)$ fm and a phase $\varphi =(87\pm 2{)}^{\circ }$, while the range parameter is not well-constrained. The striking behavior of the GRAAL data on the beam asymmetry in the threshold region suggests that a narrow proton-${\eta }^{\prime }$ resonance might exist. However, the scattering length was found to be relatively insensitive to the possible existence of this narrow resonance.

   nucl-exPLB(2018)·34 citations
3. 03*

   Main features of detectors and isotopes to investigate double beta decay with increased sensitivity

   A.S. Barabash🇷🇺

   The current situation in double beta decay experiments , the characteristics of modern detectors and the possibility of increasing the sensitivity to neutrino mass in future experiments are discussed. The issue of the production and use of enriched isotopes in double beta decay experiments is discussed in addition.

   nucl-exphysics.ins-detInt.J.Mod.Phys.A(2018)·23 citations
4. 04*

   Polar polarization: a new method for polarimetry analysis

   D. Izraeli (1)🇮🇱 · I. Mardor (1,2)🇮🇱 · E.O. Cohen (1)🇮🇱 · M. Duer (1)🇮🇱 · T.Y. Izraeli (3) · I. Korover (1,4)🇮🇱 · J. Lichtenstadt (1)🇮🇱 · E. Piasetzky (1) ((1) School of Physics and Astronomy, Tel Aviv University, Tel Aviv 6997801, Israel., (2) Soreq NRC, Yavne 81800, Israel., (3) Guardian Optical Technologies, Derech Hashalom 7, Tel Aviv 6789208, Israel., (4) Department of Physics, NRCN, P.O. Box 9001, Beer-Sheva 8419001, Israel.)🇮🇱

   We present a novel analysis method for measurements of polarization transferred in $A(\vec{e},e^{\prime }\vec{N})$ experiments, which can be applied to other kinds of polarization measurements as well. In this method the polarization transfer components are presented in spherical coordinates using an efficient likelihood numerical maximization based on an analytic derivation. We also propose a formalism that accounts for multi-parameter models, and which yields a smooth and continuous representation of the data (rather than using standard binning). Applying this method on simulated data generates results with reduced statistical and systematic uncertainties and enables revealing physical information that is lost in standard binning of the data. The obtained results can be compared easily to theoretical models and other measurements. Furthermore, CPU time is significantly reduced using this method.

   ↳ nucl-thhep-phnucl-exJINST(2018)·2 citations
5. 05*

   Impact of the ${}^7$Be($\alpha ,\gamma$)${}^{11}$C reaction on the primordial abundance of ${}^7$Li

   M. Hartos · C. A. Bertulani🇺🇸 · Shubhchintak🇺🇸 · A. M. Mukhamedzhanov🇺🇸 · S. Hou🇹🇼

   We calculate the radiative capture cross section for ${}^7$Be($\alpha ,\gamma$)${}^{11}$C and its reaction rate of relevance for the big bang nucleosynthesis. The impact of this reaction on the primordial ${}^7$Li abundance is revised including narrow and broad resonances in the pertinent energy region. Our calculations show that it is unlikely that very low energy resonances in ${}^{11}$C of relevance for the big bang nucleosynthesis would emerge within a two-body potential model. Based on our results and a comparison with previous theoretical and experimental analyses, we conclude that the impact of this reaction on the so-called "cosmological lithium puzzle" is completely irrelevant.

   ↳ nucl-thastro-ph.COnucl-exApJ(2018)·11 citations
6. 06*

   Multipole Modes for Triaxially Deformed Superfluid Nuclei

   Kouhei Washiyama · Takashi Nakatsukasa🇯🇵

   To study shape fluctuations of nuclei in transitional regions, the collective Hamiltonian method has often been employed. We intend to construct the quadrupole collective Hamiltonian with the collective inertial functions given by the local quasiparticle random-phase approximation (QRPA) based on the Skyrme energy density functional. For this purpose, we first construct a practical framework of Skyrme QRPA for triaxial nuclear shapes with the finite amplitude method (FAM). We show quadrupole strength functions for a triaxial superfluid nucleus ${}^{188}$Os and the Thouless-Valatin rotational moment of inertia by the local FAM-QRPA for ${}^{106}$Pd.

   ↳ nucl-thnucl-exJPS Conf.Proc.(2018)·4 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.