Mon·Jul 31, 2017Monday·July 31, 2017

1. 01*

   Proton and neutron electromagnetic form factors and uncertainties

   Zhihong Ye🇺🇸 · John Arrington🇺🇸 · Richard J. Hill🇨🇦 · Gabriel Lee🇮🇱

   We determine the nucleon electromagnetic form factors and their uncertainties from world electron scattering data. The analysis incorporates two-photon exchange corrections, constraints on the low-Q2 and high-Q2 behavior, and additional uncertainties to account for tensions between different data sets and uncertainties in radiative corrections.

   nucl-exhep-phnucl-thPLB(2018)·182 citations
2. 02*

   A Review of Elliptic Flow of Light Nuclei in Heavy-Ion Collisions at RHIC and LHC Energies

   Md. Rihan Haque🇳🇱 · Chitrasen Jena🇮🇳 · Bedangadas Mohanty🇮🇳

   We present a review of the measurements of elliptic flow ($v_2$) of light nuclei ($d$,$\bar{d}$, $t$, ${}^3\mathrm{He}$, and ${}^3\overline{\mathrm{He}}$) from the RHIC and LHC experiments. Light (anti)nuclei $v_2$ have been compared with that of (anti)proton. We observed a similar trend in light nuclei $v_2$ to that in identified hadron $v_2$ with respect to the general observations such as ($p_{\mathrm{T}}$) dependence, low $p_{\mathrm{T}}$ mass ordering, and centrality dependence. We also compared the difference of nuclei and antinuclei $v_2$ with the corresponding difference of $v_2$ of proton and antiproton at various collision energies. Qualitatively they depict similar behavior. We also compare the data on light nuclei $v_2$ to various theoretical models such as blast-wave and coalescence. We then present a prediction of $v_2$ for ${}^3\mathrm{He}$ and ${}^4\mathrm{He}$ using coalescence and blast-wave models.

   nucl-exAdv.High Energy Phys.(2017)·7 citations
3. 03*

   Delta isobars and nuclear saturation

   A. Ekström🇸🇪 · G. Hagen🇺🇸 · T. D. Morris🇺🇸 · T. Papenbrock🇺🇸 · P. D. Schwartz🇺🇸

   We construct a nuclear interaction in chiral effective field theory with explicit inclusion of the $\Delta$-isobar $\Delta (1232)$ degree of freedom at all orders up to next-to-next-to-leading order (NNLO). We use pion-nucleon ($\pi N$) low-energy constants (LECs) from a Roy-Steiner analysis of $\pi N$ scattering data, optimize the LECs in the contact potentials up to NNLO to reproduce low-energy nucleon-nucleon scattering phase shifts, and constrain the three-nucleon interaction at NNLO to reproduce the binding energy and point-proton radius of ${}^4$He. For heavier nuclei we use the coupled-cluster method to compute binding energies, radii, and neutron skins. We find that radii and binding energies are much improved for interactions with explicit inclusion of $\Delta (1232)$, while $\Delta$-less interactions produce nuclei that are not bound with respect to breakup into $\alpha$ particles. The saturation of nuclear matter is significantly improved, and its symmetry energy is consistent with empirical estimates.

   ↳ nucl-thnucl-exPRC(2018)·132 citations
4. 04*

   Maris polarization in neutron-rich nuclei

   Shubhchintak🇺🇸 · C.A. Bertulani🇺🇸 · T. Aumann🇩🇪

   We present a theoretical study of the Maris polarization effect and its application in quasi-free reactions to assess information on the structure of exotic nuclei. We discuss the uncertainties in the calculations of triple differential cross sections and of analyzing powers due the choices of various nucleon-nucleon interactions the optical potentials and limitations of the method. Our calculations explore a large number of choices for the nucleon-nucleon (NN) interactions and the optical potential for nucleon-nucleus scattering. Our study implies that polarization variables in (p,2p) reactions in inverse kinematics can be an effective probe of single-particle structure of nuclei in radioactive-beam facilities.

   ↳ nucl-thnucl-exPLB(2018)·7 citations
5. 05*

   Multi-layer plastic scintillation detector for intermediate- and high-energy neutrons with $n$-$\gamma$ discrimination capability

   L.Yu🇨🇳 · S.Terashima🇨🇳 · H.J.Ong🇯🇵 · P.Y.Chan · I.Tanihata🇯🇵 · C.Iwamoto🇯🇵 · D.T.Tran · A.Tamii🇯🇵 · N.Aoi🇯🇵 · H.Fujioka🇯🇵 · G.Gey🇯🇵 · H.Sakaguchi🇯🇵 and 6 other authors

   A new type of neutron detector, named Stack Structure Solid organic Scintillator (S${}^4$), consisting of multi-layer plastic scintillators with capability to suppress low-energy $\gamma$ rays under high-counting rate has been constructed and tested. To achieve $n$-$\gamma$ discrimination, we exploit the difference in the ranges of the secondary charged particles produced by the interactions of neutrons and $\gamma$ rays in the scintillator material. The thickness of a plastic scintillator layer was determined based on the results of Monte Carlo simulations using the Geant4 toolkit. With layer thicknesses of 5 mm, we have achieved a good separation between neutrons and $\gamma$ rays at 5 MeV${}_{\mathrm{ee}}$ threshold setting. We have also determined the detection efficiencies using monoenergetic neutrons at two energies produced by the $d$+$d\to n$+${}^3$He reaction. The results agree well with the Geant4 simulations implementing the Li$\grave{\mathrm{e}}$ge Intranuclear Cascade hadronic model (INCL++) and the high-precision model of low-energy neutron interactions (NeutronHP).

   ↳ physics.ins-detnucl-exNucl.Instrum.Meth.A(2017)·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.