Fri·Sep 18, 2015Friday·September 18, 2015

1. 01*

   Production of antimatter ${}^{5,6}$Li nuclei in central Au+Au collisions at $\sqrt{s_{NN}}=200$ GeV

   Kai-Jia Sun🇨🇳 · Lie-Wen Chen🇨🇳

   Combining the covariant coalescence model and a blast-wave-like analytical parametrization for (anti-)nucleon phase-space freezeout configuration, we explore light (anti-)nucleus production in central Au+Au collisions at $\sqrt{s_{NN}}=200$ GeV. Using the nucleon freezeout configuration (denoted by FO1) determined from the measured spectra of protons (p), deutrons (d) and ${}^3$He, we find the predicted yield of ${}^4$He is significantly smaller than the experimental data. We show this disagreement can be removed by using a nucleon freezeout configuration (denoted by FO2) in which the nucleons are assumed to freeze out earlier than those in FO1 to effectively consider the effect of large binding energy value of ${}^4$He. Assuming the binding energy effect also exists for the production of ${}^5\text{Li}$, ${}^5\overline{\text{Li}}$, ${}^6\text{Li}$ and ${}^6\overline{\text{Li}}$ due to their similar binding energy values as ${}^4$He, we find the yields of these heavier (anti-)nuclei can be enhanced by a factor of about one order, implying that although the stable (anti-)${}^6$Li nucleus is unlikely to be observed, the unstable (anti-)${}^5$Li nucleus could be produced in observable abundance in Au+Au collisions at $\sqrt{s_{NN}}=200$ GeV where it may be identified through the p-${}^4\text{He}$ ($\overline{\text{p}}$-${}^4\overline{\text{He}}$) invariant mass spectrum. The future experimental measurement on (anti-)${}^5\text{Li}$ would be very useful to understand the production mechanism of heavier antimatter.

   ↳ nucl-thastro-ph.COhep-phnucl-exPLB(2015)·40 citations
2. 02*

   Green's Function Monte Carlo Calculations with Two- and Three-Nucleon Interactions from Chiral Effective Field Theory

   J. E. Lynn🇺🇸

   I discuss our recent work on Green's function Monte Carlo (GFMC) calculations of light nuclei using local nucleon-nucleon interactions derived from chiral effective field theory (EFT) up to next-to-next-to-leading order (N${}^2$LO). I present the natural extension of this work to include the consistent three-nucleon (3N) forces at the same order in the chiral expansion. I discuss our choice of observables to fit the two low-energy constants which enter in the 3N sector at N${}^2$LO and present some results for light nuclei.

   ↳ nucl-thnucl-exEPJ Web Conf.(2016)·1 citation

* 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.