Wed·Jul 31, 2019Wednesday·July 31, 2019

1. 01*

   Chirality of ${}^{135}$Nd reexamined: Evidence for multiple chiral doublet bands

   B.F. Lv🇫🇷 · C. M. Petrache🇫🇷 · Q. B. Chen🇩🇪 · J. Meng🇨🇳 · A. Astier🇫🇷 · E. Dupont🇫🇷 · P. Greenlees🇫🇮 · H. Badran🇫🇮 · T. Calverley🇫🇮 · D. M. Cox🇫🇮 · T. Grahn🇫🇮 · J. Hilton🇫🇮 and 26 other authors

   One new pair of positive-parity chiral doublet bands have been identified in the odd-$A$ nucleus ${}^{135}$Nd which together with the previously reported negative-parity chiral doublet bands constitute a third case of multiple chiral doublet (M$\chi$D) bands in the $A\approx 130$ mass region. The properties of the M$\chi$D bands are well reproduced by constrained covariant density functional theory and particle rotor model calculations. The newly observed M$\chi$D bands in ${}^{135}$Nd represents an important milestone in supporting the existence of M$\chi$D in nuclei.

   nucl-exnucl-thPRC(2019)·32 citations
2. 02*

   Production of multi-charmed hadrons by recombination in heavy ion collisions

   Sungtae Cho🇰🇷 · Su Houng Lee🇰🇷

   We study the production of multi-charmed hadrons by recombination in heavy ion collisions by focusing on the production of ${\Xi }_{cc}$, ${\Xi }_{cc}^{\ast }$, ${\Omega }_{scc}$, ${\Omega }_{scc}^{\ast }$, ${\Omega }_{ccc}$ baryons and X(3872) mesons. Starting from the estimation of yields for those hadrons at chemical freeze-out in both the statistical and coalescence model, we evaluate their transverse momentum distributions at mid-rapidity in the coalescence model. We show that yields of multi-charmed hadrons in heavy ion collisions at RHIC and LHC are large enough, and thereby not only multi-charmed hadrons observed so far, e.g., the ${\Xi }_{cc}$ but also those which have not been observed yet, can be discovered sufficiently in heavy ion collisions. We also find that the transverse momentum distribution ratio between various multi-charmed hadrons sensitively reflects the interplay between quark contents of corresponding hadrons as well as the transverse momentum distribution of charm quarks at the hadronization point, and therefore we insist that studying both the transverse momentum distributions of multi-charmed hadrons themselves and transverse momentum distribution ratios between various multi-charmed hadrons provide us with useful information on hadron production mechanism involving charm quarks in heavy ion collisions.

   ↳ nucl-thhep-phnucl-exPRC(2020)·29 citations
3. 03*

   Uncertainties in $\nu$p-process nucleosynthesis from Monte Carlo variation of reaction rates

   N. Nishimura🇯🇵 · T. Rauscher🇨🇭 · R. Hirschi🇬🇧 · G. Cescutti🇮🇹 · A. St. J. Murphy🇬🇧 · C. Fröhlich🇺🇸

   It has been suggested that a $\nu$p process can occur when hot, dense, and proton-rich matter is expanding within a strong flux of anti-neutrinos. In such an environment, proton-rich nuclides can be produced in sequences of proton captures and (n,p) reactions, where the free neutrons are created in situ by ${\overline{\nu }}_{\mathrm{e}}+\mathrm{p}\to \mathrm{n}+{\mathrm{e}}^{+}$ reactions. The detailed hydrodynamic evolution determines where the nucleosynthesis path turns off from N = Z line and how far up the nuclear chart it runs. In this work, the uncertainties on the final isotopic abundances stemming from uncertainties in the nuclear reaction rates were investigated in a large-scale Monte Carlo approach, simultaneously varying ten thousand reactions. A large range of model conditions was investigated because a definitive astrophysical site for the $\nu$p process has not yet been identified. The present parameter study provides, for each model, identification of the key nuclear reactions dominating the uncertainty for a given nuclide abundance. As all rates appearing in the $\nu$p process involve unstable nuclei, and thus only theoretical rates are available, the final abundance uncertainties are larger than those for nucleosynthesis processes closer to stability. Nevertheless, most uncertainties remain below a factor of three in trajectories with robust nucleosynthesis. More extreme conditions allow production of heavier nuclides but show larger uncertainties because of the accumulation of the uncertainties in many rates and because the termination of nucleosynthesis is not at equilibrium conditions. It is also found that the solar ratio of the abundances of ${}^{92}$Mo and ${}^{94}$Mo could be reproduced within uncertainties.

   ↳ astro-ph.SRastro-ph.HEnucl-exnucl-thMNRAS(2019)·35 citations
4. 04*

   Coupling Constant Corrections in a Holographic Model of Heavy Ion Collisions with Nonzero Baryon Number Density

   Åsmund Folkestad🇺🇸 · Sašo Grozdanov🇺🇸 · Krishna Rajagopal🇺🇸 · Wilke van der Schee🇨🇭

   Sufficiently energetic collisions of heavy ions result in the formation of a droplet of a strongly coupled liquid state of QCD matter known as quark-gluon plasma. By using gauge-gravity duality (holography), a model of a rapidly hydrodynamizing and thermalizing process like this can be constructed by colliding sheets of energy density moving at the speed of light and tracking the subsequent evolution. In this work, we consider the dual gravitational description of such collisions in the most general bulk theory with a four-derivative gravitational action containing a dynamical metric and a gauge field in five dimensions. Introducing the bulk gauge field enables the analysis of collisions of sheets which carry nonzero "baryon" number density in addition to energy density. Introducing the four-derivative terms enables consideration of such collisions in a gauge theory with finite gauge coupling, working perturbatively in the inverse coupling. While the dynamics of energy and momentum in the presence of perturbative inverse-coupling corrections has been analyzed previously, here we are able to determine the effect of such finite coupling corrections on the dynamics of the density of a conserved global charge, which we take as a model for the dynamics of nonzero baryon number density. In accordance with expectations, as the coupling is reduced we observe that after the collisions less baryon density ends up stopped at mid-rapidity and more of it ends up moving near the lightcone.

   ↳ hep-thhep-phnucl-exnucl-thJHEP(2019)·16 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.