Nuclear Theory·nucl-th

Tuesday·November 5, 2019

20 papers—12 primary·8 cross-listed

01
[Submitted on 2 Nov 2019]
Beyond the charge radius: the information content of the fourth radial moment
P.-G. Reinhard🇩🇪 · W. Nazarewicz🇺🇸 · R.F. Garcia Ruiz🇨🇭
Measurements of atomic transitions in different isotopes offer key information on the nuclear charge radius. The anticipated high-precision experimental techniques, augmented by atomic calculations, will soon enable extraction of the higher-order radial moments of the charge density distribution. To assess the value of such measurements for nuclear structure research, we study the information content of the fourth radial moment $\rf$ by means of nuclear density functional theory and a multiple correlation analysis. We show that $\rf$ can be directly related to the surface thickness of nuclear density, a fundamental property of the atomic nucleus that is difficult to obtain for radioactive systems. Precise knowledge of these radial moments is essential to establish reliable constraints on the existence of new forces from precision isotope shift measurements .
Comments:
5 pages, 4 figures
Subjects:
Nuclear Theory (nucl-th)
arXiv:
1911.00699 [pdf]
PRC(2020)·49 citations
02
[Submitted on 3 Nov 2019]
Probing the partonic degrees of freedom in high multiplicity p-Pb collisions at $s_{N N} =$ 5.02 TeV
Wenbin Zhao🇨🇳 · Che Ming Ko🇺🇸 · Yu-Xin Liu🇨🇳 · Guang-You Qin🇨🇳 · Huichao Song🇨🇳
We investigate the role of partonic degrees of freedom in high multiplicity p-Pb collisions at $s_{N N} =$ 5.02 TeV carried out at the Large Hadron Collider (LHC) by studying the production and collective flow of identified hadrons at intermediate $p_{T}$ via the coalescence of soft and hard partons generated from viscous hydrodynamics (VISH2+1) and the energy loss model (LBT), respectively. We find that combining the intermediate $p_{T}$ hadrons from the coalescence with the low $p_{T}$ hadrons from hydrodynamics and high $p_{T}$ hadrons from the jet fragmentation, our Hydro-Coal-Frag model provides a nice description of the measured $p_{T}$ -spectra and the differential elliptic flow $v_{2} (p_{T})$ of pions, kaons and protons over the $p_{T}$ range from 0 to 6 GeV. We further demonstrate the necessity of including the quark coalescence contribution to reproduce the experimentally observed approximate number of constituent quark scaling of hadron $v_{2}$ at intermediate $p_{T}$ . Our results thus indicate the importance of partonic degrees of freedom and also hint at the possible formation of quark-gluon plasma in high multiplicity p+Pb collisions at the LHC.
Comments:
6 pages, 3 figures, published version
Subjects:
Nuclear Theory (nucl-th); High Energy Physics — Phenomenology (hep-ph); Nuclear Experiment (nucl-ex)
arXiv:
1911.00826 [pdf]
PRL(2020)·100 citations
03
[Submitted on 3 Nov 2019]
Pion-nucleon scattering to $O (p^{3})$ in heavy baryon SU(3) chiral perturbation theory
Bo-Lin Huang🇨🇳 · Jing Ou-Yang🇨🇳
We calculate the complete $T$ -matrices of pion-nucleon ( $π N$ ) scattering to the third order in heavy baryon SU(3) chiral perturbation theory. The baryon mass in the chiral limit $M_{0}$ and the low-energy constants are determined by fitting to phase shifts of $π N$ and the experimental octet-baryon masses simultaneously. By using these constants, we obtain the pion-nucleon sigma terms, $σ_{π N} = (34.57 \pm 11.85)$ MeV. We also find that a very small strangeness content of the proton, $y ≃ 0$ . The scattering lengths and the scattering volumes are predicted, which turn out to be in good agreement with those of other approaches and the available experiment data. The contributions from the third-order amplitudes are discussed in detail. We find that the contributions from the internal kaon lines of one-loop diagrams and the counterterms of the third order are sizeable. In addition, the issue of convergence is also discussed.
Comments:
18 pages, 7 figures, 3 tables
Subjects:
Nuclear Theory (nucl-th); High Energy Physics — Phenomenology (hep-ph)
arXiv:
1911.00846 [pdf]
PRD(2020)·16 citations
04
[Submitted on 3 Nov 2019]
Hyperon interaction with dense nuclear matter and link to neutron stars
Laura Tolos🇩🇪
The theoretical status of the hyperon-nucleon and hyperon-hyperon interactions is reviewed, paying a special attention to chiral effective field theories. Results on hyperons in dense matter are presented and the consequences for the properties of neutron stars are analyzed.
Comments:
6 pages, 2 figures, invited plenary talk, published In: Elia D., Bruno G.E., Colangelo P., Cosmai L. (eds). The XVIII International Conference on Strangeness in Quark Matter (SQM 2019)
Subjects:
Nuclear Theory (nucl-th); High Energy Astrophysical Phenomena (astro-ph.HE); High Energy Physics — Phenomenology (hep-ph)
arXiv:
1911.00853 [pdf]
Springer Proc.Phys.(2020)·0 citations
05
[Submitted on 3 Nov 2019]
Neutron Shell Closure at N=32 and N=40 in Ar and Ca Isotopes
M. El Adri · M. Oulne
In this paper, we investigate features of the ground state of some nuclei far from the stability for isotope chains with proton numbers Z=18 and 20. Our aim is to predict the eventual existence of magic numbers in these exotic nuclei. For this purpose, we use two methods: the non relativistic Hartree-Fock-Bogoliubov (HFB) approach based on SLy4 Skyrme functional and the relativistic (so-called covariant) density functional theory (CDFT) by using the DD-ME2 force parametrization. We compare our results with the available experimental data and with the predictions of other models such as Finite Range Droplet Model (FRDM). Our present investigation predicts that N=32 and N=40 are magic numbers for Ar and Ca isotopes.
Comments:
18p, 10 figures
Subjects:
Nuclear Theory (nucl-th)
arXiv:
1911.00860 [pdf]
Eur.Phys.J.Plus(2020)·11 citations
06
[Submitted on 4 Nov 2019]
$K^{-} p$ Correlation Function from High-Energy Nuclear Collisions and Chiral SU(3) Dynamics
Yuki Kamiya🇨🇳 · Tetsuo Hyodo🇯🇵 · Kenji Morita🇯🇵 · Akira Ohnishi🇯🇵 · Wolfram Weise🇩🇪
The two-particle momentum correlation function of a K^-p pair from high-energy nuclear collisions is evaluated in the KbarN-piSigma-piLambda coupled-channels framework. The effects of all coupled channels together with the Coulomb potential and the threshold energy difference between K^-p and Kbar0 n are treated completely for the first time. Realistic potentials based on the chiral SU(3) dynamics are used which fit the available scattering data. The recently measured correlation function is found to be well reproduced by allowing variations of the source size and the relative weight of the source function of piSigma with respect to that of KbarN. The predicted K^-p correlation function from larger systems, which is less affected by the piSigma source function, indicates that the investigation of its source size dependence is useful in providing further constraints in the study of the KbarN interaction.
Comments:
5 pages, 3 figures, published version
Subjects:
Nuclear Theory (nucl-th); High Energy Physics — Phenomenology (hep-ph)
arXiv:
1911.01041 [pdf]
PRL(2020)·85 citations
07
[Submitted on 4 Nov 2019]
Absorption of $ω$ and $ϕ$ mesons in the inclusive photonuclear reaction
Swapan Das🇮🇳
The $ω$ and $ϕ$ mesons dominantly decay outside the nucleus because the decay-lengths of them are much larger than the dimension of the nucleus. Therefore, the medium modification of the above mesons is studied through their absorption in the nucleus. CLAS collaboration at Jefferson Laboratory (Jlab) has investigated the absorption of the $ω$ and $ϕ$ mesons by measuring the nuclear transparency ratios for them in the $γ A \to ω (ϕ) X \to e^{+} e^{-} X$ reaction. The nuclear transparency ratios for both $ω$ and $ϕ$ mesons in the above reactions have been calculated, and those are compared with the experimental findings, reported from Jlab, to estimate the $ω$ meson nucleon and $ϕ$ meson nucleon cross sections in the nucleus.
Comments:
15 pages, 4 figures
Subjects:
Nuclear Theory (nucl-th); Nuclear Experiment (nucl-ex)
arXiv:
1911.01047 [pdf]
EPJA(2019)·6 citations
08
[Submitted on 4 Nov 2019]
Influence of surface effects on neutron skin in atomic nuclei
S.V. Lukyanov · A.I. Sanzhur
The influence of the diffuse surface layer of a finite nucleus on the mean square radii and their isotopic shift is investigated. We present the calculations within the Gibbs-Tolman approach using the experimental values of the nucleon separation energies. Results are compared with that obtained by means of direct variational method based on Fermi-like trial functions.
Comments:
16 pages, 7 figures; 1 figure, some discussions and references added, published version
Subjects:
Nuclear Theory (nucl-th)
arXiv:
1911.01104 [pdf]
Nucl.Phys.Atom.Energy(2020)·1 citation
09
[Submitted on 4 Nov 2019]
Dynamical freeze-out phenomena: The case of $K^{\pm}, ϕ$ transverse momentum spectra in collisions of Au(1.23 A GeV) + Au
B. Rabe🇩🇪 · B. Kämpfer🇩🇪
We argue on a continuous (dynamical) kinetic freeze-out of $K^{\pm}, ϕ$ observed at midrapidity in collisions Au(1.23 A GeV) + Au. The simulations by means of a transport model of BUU type point to time independent transverse momentum slope parameters after 20 fm/c. The complex interplay of expansion dynamics and strangeness production/exchange/absorption as well as elastic scatterings involved in the reaction network does not support the previous interpretation of a late freeze-out of $K^{-}$ due to larger cross sections.
Subjects:
Nuclear Theory (nucl-th)
arXiv:
1911.01142 [pdf]
Particles(2019)·0 citations
10
[Submitted on 4 Nov 2019]
Quark number scaling of $p_{T}$ spectra for $Ω$ and $ϕ$ in relativistic heavy-ion collisions
Jun Song🇨🇳 · Feng-lan Shao🇨🇳 · Zuo-tang Liang🇨🇳
We show that the experimental data of transverse momentum ( $p_{T}$ ) spectra of $Ω$ baryon and $ϕ$ meson at mid-rapidity in heavy-ion collisions exhibit the constituent quark number scaling in a wide energy range from RHIC to LHC. Such a scaling behavior is a direct consequence of quark combination mechanism via equal velocity combination and provides a very convenient way to extract the $p_{T}$ spectrum of strange quarks at hadronization. We present the results of strange quarks obtained from the available data and study the properties in particular the energy dependence of the averaged transverse momentum $⟨ p_{T} ⟩$ and the transverse radial flow velocity $⟨ β ⟩$ with a hydrodynamics-motivated blast-wave model.
Comments:
7 pages, 5 figures
Subjects:
Nuclear Theory (nucl-th); Nuclear Experiment (nucl-ex)
arXiv:
1911.01152 [pdf]
PRC(2020)·16 citations
11
[Submitted on 4 Nov 2019]
Theory Summary at Strangeness in Quark Matter 2019
Jacquelyn Noronha-Hostler🇺🇸
This is the theory summary of Strangeness in Quark Matter 2019 conference. Results include the state-of-the-art updates to the Quantum Chromodynamics (QCD) phase diagram with contributions both from heavy-ion collisions and nuclear astrophysics, studies on the QCD freeze-out lines, and several aspects regarding small systems including collectivity, heavy flavor dynamics, strangeness, and hard probes.
Comments:
7 pages, 1 figure, proceedings from the 18th International Conference on Strangeness in Quark Matter (SQM 2019)
Subjects:
Nuclear Theory (nucl-th); High Energy Astrophysical Phenomena (astro-ph.HE); High Energy Physics — Lattice (hep-lat); High Energy Physics — Phenomenology (hep-ph)
arXiv:
1911.01328 [pdf]
Springer Proc.Phys.(2020)·2 citations
12
[Submitted on 4 Nov 2019]
D meson sensitivity to a system size scan at LHC
Roland Katz🇫🇷 · Jacquelyn Noronha-Hostler🇺🇸 · Caio A. G. Prado🇨🇳 · Alexandre A. P. Suaide🇧🇷
Experimental measurements in pA collisions indicate no D meson suppression ( $R_{pPb} \sim 1$ ) but a surprisingly large $v_{2}$ . To better understand these results we propose a system size scan at the LHC involving $^{16}$ OO, $^{40}$ ArAr, $^{129}$ XeXe and $^{208}$ PbPb collisions. Using Trento+ v-USPhydro+DAB-MOD to make predictions, we find that the $R_{AA}$ tends towards unity when the system size is decreased, but nonetheless, in the most central collisions $v_{2} {2}$ is almost independent of the colliding system. These results are analyzed in light of path length and initial eccentricity variations.
Comments:
4 pages, proceeding of Strangeness in Quark Matter (SQM 2019)
Subjects:
Nuclear Theory (nucl-th); High Energy Physics — Experiment (hep-ex); High Energy Physics — Phenomenology (hep-ph)
arXiv:
1911.01396 [pdf]
Springer Proc.Phys.(2020)·1 citation

Affiliations

first authorsco-authorsvia INSPIRE