Nuclear Theory·nucl-th

Tuesday·December 10, 2019

10 papers—3 primary·7 cross-listed

01
[Submitted on 6 Dec 2019]
Connection between Elliott SU(3) and spherical shell model bases
A. Martinou · N. Minkov · S. Sarantopoulou · S. Peroulis · I. E. Assimakis · D. Bonatsos
In the Elliott SU(3) symmetry scheme the single particle basis is derived from the isotropic harmonic oscillator Hamiltonian in the Cartesian coordinate system. These states are transformed into the solutions of the same Hamiltonian within the spherical coordinate system. Then the spin-orbit coupling can be added in a straightforward way. The outcome is a transformation between the Elliott single particle basis and the spherical shell model space.
Comments:
10 pages
Subjects:
Nuclear Theory (nucl-th)
arXiv:
1912.03319 [pdf]
Bulg.J.Phys.(2019)·1 citation
02
[Submitted on 9 Dec 2019]
Neutron stars from crust to core within the Quark-meson coupling model
Sofija Antic🇦🇺 · Jirina R. Stone🇬🇧 · Anthony W. Thomas🇦🇺
Recent years continue to be an exciting time for the neutron star physics, providing many new observations and insights to these natural laboratories of cold dense matter. To describe them, there are many models on the market but still none that would reproduce all observed and experimental data. The quark-meson coupling model stands out with its natural inclusion of hyperons as dense matter building blocks, and fewer parameters necessary to obtain the nuclear matter equation of state. The latest advances of the QMC model and its application to the neutron star physics will be presented, within which we build the neutron star's outer crust from finite nuclei up to the neutron drip line. The appearance of different elements and their position in the crust of a neutron star is explored and compared to the predictions of various models, giving the same quality of the results for the QMC model as for the models when the nucleon structure is not taken into account.
Comments:
4 pages, 1 figure, conference proceedings HIAS2019
Subjects:
Nuclear Theory (nucl-th)
arXiv:
1912.03815 [pdf]
EPJ Web Conf.(2020)·4 citations
03
[Submitted on 9 Dec 2019]
An overview of the scientific contribution of Andrea Vitturi to Nuclear Physics (being an account of the recent TNP19 meeting held in Padova)
L. Fortunato🇮🇹 · C.E. Alonso🇪🇸 · J.M. Arias🇪🇸 · J. Casal🇮🇹 · K. Hagino🇯🇵 · J.A. Lay🇪🇸 · E.G. Lanza🇮🇹 · S.M. Lenzi🇮🇹 · J. Lubian🇧🇷 · T. Oishi🇭🇷 · F. Pérez-Bernal🇪🇸
We give an account of the main achievements of the scientific career of Andrea Vitturi so far, that have recently been discussed during the workshop "Theoretical Nuclear Physics in Padova" on the occasion of his retirement from full professor at the University of Padova. He has oftentimes been the driving force behind numerous contributions to nuclear structure and nuclear reactions that are here reviewed: giant resonances, pairing correlations, collective modes, algebraic models, inelastic excitations, electromagnetic response, break-up and transfer reactions, coupled-channel formalism, clustering, subbarrier fusion processes, etc. Among these topics several inspirational works and ideas can be found that we would like to highlight.
Subjects:
Nuclear Theory (nucl-th); Nuclear Experiment (nucl-ex)
arXiv:
1912.03932 [pdf]
EPJA(2020)·0 citations
04
[Submitted on 6 Dec 2019] (cross-list from hep-ph)
Production of the (predicted) $K^{*} (4307)$ in $B$ decays
Xiu-Lei Ren🇩🇪 · K. P. Khemchandani🇧🇷 · A. Martinez Torres🇧🇷
In this work we study the production of $K^{*} (4307)$ in $B$ decays by determining the $J / ψ π^{+ (0)} K^{0}$ and $J / ψ π^{-} K^{+}$ invariant mass distributions of the processes $B^{+} \to J / ψ π^{+} π^{0} K^{0}$ and $B^{+} \to J / ψ π^{+} π^{-} K^{+}$ , respectively. Such $K^{*} (4307)$ has been recently predicted as a three-body state originated from the dynamics involved in the $K D D ˉ^{*}$ system, with the $K D$ subsystem forming the $D_{s 0}^{*} (2317)$ in isospin 0, and the $D D ˉ^{*}$ subsystem generating the $X (3872)$ in isospin 0 and the $Z_{c} (3900)$ in isospin 1. The hidden charm content of $K^{*} (4307)$ favors its decay to a state like $J / ψ π K$ and the study of $B$ -decays with these particles in their final states can constitute a way of finding experimental evidences for such an exotic vector meson, whose width, in spite of its large mass, is still quite narrow (around 18 MeV).
Subjects:
High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
arXiv:
1912.03369 [pdf]
PRD(2020)·8 citations
05
[Submitted on 7 Dec 2019] (cross-list from hep-ph)
Contributions of box diagrams and $Δ (1940)$ resonance to $K^{0} Σ^{+}$ photoproduction
Xuyang Liu🇨🇳 · Daris Samart🇹🇭 · Kai Xu🇹🇭 · Ayut Limphirat🇹🇭 · Yupeng Yan🇹🇭 · Qiang Zhao🇨🇳
We study first the box-diagram contribution to the $γ p \to K^{0} Σ^{+}$ process to understand the anomaly of the kaon photoproduction cross section from CBELSA/TAPS experiment at Electron Stretcher Accelerator (ELSA), where the imaginary part of the scattering amplitude from the box-diagrams is calculated by using Cutkosky's rules in the on-shell approximation while the real part of the amplitude is derived by dispersion relation calculations. Together with the results of the K-MAID model, the contribution of the box-diagrams fails to provide the sudden drop of the differential cross-section between the $K^{*} Λ$ and $K^{*} Σ$ thresholds. In addition, we include the $Δ (1940)$ resonance in the process to complete the description of the differential cross-section. Combining the contributions from the K-MAID model, the box-diagrams and the $Δ (1940)$ resonance, we have obtained the theoretical differential cross-section the $γ p \to K^{0} Σ^{+}$ process, which is compatible with the CBELSA/TAPS experimental data.
Comments:
14 pages, 3 figures
Subjects:
High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
arXiv:
1912.03477 [pdf]
1 citation
06
[Submitted on 7 Dec 2019] (cross-list from quant-ph)
Systematically Localizable Operators for Quantum Simulations of Quantum Field Theories
Natalie Klco🇺🇸 · Martin J. Savage🇺🇸
Correlations and measures of entanglement in ground state wavefunctions of relativistic quantum field theories are spatially localized over length scales set by the mass of the lightest particle. We utilize this localization to design digital quantum circuits for preparing the ground states of lattice scalar quantum field theories. Controlled rotations that are exponentially localized in their position-space extent are found to provide exponentially convergent wavefunction fidelity. These angles scale with the correlation between sites and the classical two-point correlation function, as opposed to the more localized mutual information or the hyper-localized negativity. We anticipate that further investigations will uncover quantum circuit designs with controlled rotations dictated by the measures of entanglement. This work is expected to impact quantum simulations of systems of importance to nuclear physics, high-energy physics, and basic energy sciences research.
Comments:
22 pages, 7 figures, 6 appendices
Subjects:
Quantum Physics (quant-ph); High Energy Physics — Lattice (hep-lat); High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Theory (hep-th); Nuclear Theory (nucl-th)
arXiv:
1912.03577 [pdf]
PRA(2020)·46 citations
07
[Submitted on 8 Dec 2019] (cross-list from hep-lat)
EspressoDB: A scientific database for managing high-performance computing workflow
Chia Cheng Chang🇯🇵 · Christopher Körber🇺🇸 · André Walker-Loud🇺🇸
Leadership computing facilities around the world support cutting-edge scientific research across a broad spectrum of disciplines including understanding climate change, combating opioid addiction, or simulating the decay of a neutron. While the increase in computational power has allowed scientists to better evaluate the underlying model, the size of these computational projects have grown to a point where a framework is desired to facilitate managing the workflow. A typical scientific computing workflow includes: Defining all input parameters for every step of the computation; Defining dependencies of computational tasks; Storing some of the output data; Post-processing these data files; Performing data analysis on output. EspressoDB is a programmatic object-relational data management framework implemented in Python and based on the Django web framework. EspressoDB was developed to streamline data management workflows, centralize and guarantee data integrity, while providing domain flexibility and ease of use. The framework provided by EspressoDB aims to support the ever increasing complexity of workflows of scientific computing at leadership computing facilities, with the goal of reducing the amount of human time required to manage the jobs, thus giving scientists more time to focus on science.
Comments:
Repository: https://github.com/callat-qcd/espressodb, use case: https://github.com/callat-qcd/lattedb; published version
Subjects:
High Energy Physics — Lattice (hep-lat); Nuclear Theory (nucl-th); Computational Physics (physics.comp-ph)
arXiv:
1912.03580 [pdf]
J.Open Source Softw.(2020)·9 citations
08
[Submitted on 8 Dec 2019] (cross-list from physics.atom-ph)
Electric dipole moments of atoms and molecules produced by enhanced nuclear Schiff moments
V.V. Flambaum🇦🇺 · V.A. Dzuba🇦🇺
We perform calculations of the CP-violating atomic and molecular electric dipole moments (EDM) induced by the interaction of the nuclear Schiff moments with electrons. EDM of atoms Eu, Dy, Gd, Ac, Th, Pa, U, Np and Pu are of special interest since they have isotopes with strongly enhanced nuclear Schiff moments caused by the octupole nuclear deformation or soft octupole vibration mode. These atoms have open 4f or 5f shells making the calculations complicated. We use our special version of the configuration interaction method combined with the many-body perturbation theory method adopted for open f-shell case. To validate the method we perform similar calculations for simpler atoms (Xe, Hg, Tl+, Pb, Pb++, Rn, Ra) where some earlier results are available. In addition we present the estimates of the CP-violating nuclear spin - molecular axis interaction constants for molecules which may be of experimental interest including AcF, EuN, ThO, PbO and TlF. We also present updated values of the nuclear Schiff moments and atomic and molecular EDM expressed in terms of the CP-violating pi-meson - nucleon interaction constants g_0,g_1, g_2, QCD parameter theta and quark chromo-EDMs. The results may be used to test CP-violation theories and search for axion dark matter in atomic, molecular and solid state experiments.
Subjects:
Atomic Physics (physics.atom-ph); High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
arXiv:
1912.03598 [pdf]
PRA(2020)·57 citations
09
[Submitted on 9 Dec 2019] (cross-list from hep-ph)
The proton radius: From a puzzle to precision
Hans-Werner Hammer🇩🇪 · Ulf-G. Meißner🇩🇪
We comment on the status and history of the proton charge radius determinations.
Comments:
3 pp, solicited article for News&Views, Science Bulletin, accepted for publication, abstract only for the arXiv version
Subjects:
High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Experiment (hep-ex); High Energy Physics — Lattice (hep-lat); Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
arXiv:
1912.03881 [pdf]
Sci.Bull.(2020)·59 citations
10
[Submitted on 9 Dec 2019] (cross-list from hep-lat)
Does confinement imply CP invariance of the strong interactions?
Y. Nakamura🇯🇵 · G. Schierholz🇩🇪
The strong coupling constant $1/ g^{2}$ and the vacuum angle $θ$ of the SU(3) Yang-Mills theory are investigated in the infrared limit under the renormalization group flow. It is shown that the theory has an infrared attractive fixed point at $1/ g^{2} = θ = 0$ , which leads to linear confinement and naturally solves the strong CP problem. In particular, any initial value of $θ \neq = 0$ is found to be driven to $θ = 0$ at macroscopic distances, where quarks and gluons freeze into hadrons by the confinement mechanism.
Comments:
7 pages, 9 figures, talk at Lattice2019, typos corrected
Subjects:
High Energy Physics — Lattice (hep-lat); High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Theory (hep-th)
arXiv:
1912.03941 [pdf]
PoS(2019)·10 citations

Affiliations

first authorsco-authorsvia INSPIRE