Nuclear Theory·nucl-th

Tuesday·April 23, 2019

11 papers—6 primary·5 cross-listed

01
[Submitted on 20 Apr 2019]
Total number of $J$ levels for identical particles in a single- $j$ shell using coefficients of fractional parentage
Jean-Christophe Pain🇫🇷
Analytical expressions of the total number of $J$ levels for three and four fermions in a nuclear $j^{n}$ shell are provided. The formulas were derived using a combination of sum rules for coefficients of fractional parentage, and "unusual" identities, i.e. which do not contain the weighting factor $(2 J + 1)$ involving $6 j$ and $9 j$ symbols.
Comments:
submitted to Phys. Rev. C
Subjects:
Nuclear Theory (nucl-th); Quantum Physics (quant-ph)
arXiv:
1904.09499 [pdf]
PRC(2019)·3 citations
02
[Submitted on 21 Apr 2019]
Quantal diffusion approach for multi-nucleon transfers in Xe + Pb collisions
S. Ayik · B. Yilmaz · O. Yilmaz · A. S. Umar
Employing a quantal diffusion description based on the stochastic mean-field (SMF) approach, we analyze the mass distribution of the primary fragments in the collisions of $^{136} Xe +^{208} Pb$ system at the bombarding energy $E_{c.m.} = 526$ ~MeV. This quantal approach provides a good description of the primary fragment distribution without any adjustable parameter, including the effects of shell structure.
Comments:
11 pages, 8 figures. arXiv admin note: text overlap with arXiv:1802.05564
Subjects:
Nuclear Theory (nucl-th)
arXiv:
1904.09619 [pdf]
PRC(2019)·51 citations
03
[Submitted on 21 Apr 2019]
Nuclear matter properties at finite temperatures from effective interactions
Jun Xu · Arianna Carbone · Zhen Zhang · Che Ming Ko
We study if commonly used nucleon-nucleon effective interactions, obtained from fitting the properties of cold nuclear matter and of finite nuclei, can properly describe the hot dense nuclear matter produced in intermediate-energy heavy-ion collisions. We use two representative effective interactions, i.e., an improved isospin- and momentum-dependent interaction with its isovector part calibrated by the results from the \emph{ab initio} non-perturbative self-consistent Green's function (SCGF) approach with chiral forces, and a Skyme-type interaction fitted to the equation of state of cold nuclear matter from chiral effective many-body perturbation theory and the binding energy of finite nuclei. In the mean-field approximation, we evaluate the equation of state and the single-nucleon potential for nuclear matter at finite temperatures and compare them to those from the SCGF approach. We find that the improved isospin- and momentum-dependent interaction reproduces reasonably well the SCGF results due to its weaker momentum dependence of the mean-field potential than in the Skyrme-type interaction. Our study thus indicates that effective interactions with the correct momentum dependence of the mean-filed potential can properly describe the properties of hot dense nuclear matter and are thus suitable for use in transport models to study heavy-ion collisions at intermediate energies.
Comments:
10 pages, 7 figures
Subjects:
Nuclear Theory (nucl-th); Nuclear Experiment (nucl-ex)
arXiv:
1904.09669 [pdf]
PRC(2019)·17 citations
04
[Submitted on 22 Apr 2019]
Do the current astronomical observations exclude the existence of non-strange quark stars?
Tong Zhao🇨🇳 · Wei Zheng🇨🇳 · Fei Wang🇨🇳 · Cheng-Ming Li🇨🇳 · Yan Yan🇨🇳 · Yong-Feng Huang🇨🇳 · Hong-Shi Zong🇨🇳
As is pointed out in a recent work (Phys. Rev. Lett. 120, 222001), quark matter may not be strange. Inspired by this argument, we use a new self-consistent mean field approximation method to study the equation of state of cold dense matter within the framework of the two-flavor NJL model. Then the mass-radius relationship of two-flavor pure quark stars is studied. In the new self-consistent mean field approximation method we introduced, there is a free parameter $α$ , which reflects the weight of different interaction channels. In principal, $α$ should be determined by experiments rather than the self-consistent mean field approximation itself. In this paper, thus, the influence of the variation of $α$ on the critical chemical potential of chiral phase transition and the stiffness of the EOS are thoroughly explored. It is found that the stiffness of EOS can be increased greatly to support a two-solar-mass pure quark star when $α$ is greater than 0.95. This means that current theoretical calculations and astronomical observations cannot rule out the possibility of a two-flavor pure quark star.
Comments:
6 pages,5 figures, 2tables
Subjects:
Nuclear Theory (nucl-th)
arXiv:
1904.09744 [pdf]
PRD(2019)·54 citations
05
[Submitted on 22 Apr 2019]
Structure of the nucleon and its first radial excitation
Jorge Segovia🇪🇸
A Poincaré-covariant continuum approach to the three valence-quark bound-state problem in quantum field theory is used to perform a detailed analysis of the nucleon's ground and first excited states: the so-called $N (940) \frac{1}{2}^{+}$ and $N (1440) \frac{1}{2}^{+}$ . Such analysis predicts the presence of nonpointlike, fully-interacting quark-quark (diquark) correlations within them, being the isoscalar-scalar and isovector-pseudovector diquarks overwhelmingly dominant with similar relative strengths in both states. Moreover, the rest-frame wave functions of both states are largely $S$ -wave in nature and the first excited state in this $1/ 2^{+}$ channel has the appearance of a radial excitation of the ground state. All these features have numerous observable consequences, we show herein those related with the nucleon's elastic, Roper's elastic and nucleon-to-Roper transition electromagnetic form factors, for both charged and neutral channels.
Comments:
16 pages, 7 figures, Contribution to a Special Issue of Few-Body Systems, dedicated to Ludwig Faddeev
Subjects:
Nuclear Theory (nucl-th); High Energy Physics — Experiment (hep-ex); High Energy Physics — Lattice (hep-lat); High Energy Physics — Phenomenology (hep-ph); Nuclear Experiment (nucl-ex)
arXiv:
1904.09842 [pdf]
Few Body Syst.(2019)·5 citations
06
[Submitted on 22 Apr 2019]
Intertwined Quantum Phase Transitions in the Zr Isotopes
N. Gavrielov · A. Leviatan · F. Iachello
We explore the situation of intertwined quantum phase transitions (IQPTs), for which a QPT involving a crossing of two configurations is accompanied by a shape evolution of each configuration with its own separate QPT. We demonstrate the relevance of IQPTs to the Zr isotopes, with such coexisting Type I and Type II QPTs, and ground state shapes changing from spherical to prolate axially deformed and finally to gamma-unstable. Evidence for this scenario is provided by a detailed comparison with experimental data, using a definite symmetry-based conceptual framework.
Comments:
6 pages, 4 figures, 1 table, final version, accepted for publication in Physical Review C
Subjects:
Nuclear Theory (nucl-th)
arXiv:
1904.09919 [pdf]
PRC(2019)·51 citations
07
[Submitted on 20 Apr 2019] (cross-list from hep-lat)
Hadrons and Nuclei
William Detmold🇺🇸 · Robert G. Edwards🇺🇸 · Jozef J. Dudek🇺🇸 · Michael Engelhardt🇺🇸 · Huey-Wen Lin🇺🇸 · Stefan Meinel🇺🇸 · Kostas Orginos🇺🇸 · Phiala Shanahan🇺🇸
This document is one of a series of whitepapers from the USQCD collaboration. Here, we discuss opportunities for lattice QCD calculations related to the structure and spectroscopy of hadrons and nuclei. An overview of recent lattice calculations of the structure of the proton and other hadrons is presented along with prospects for future extensions. Progress and prospects of hadronic spectroscopy and the study of resonances in the light, strange and heavy quark sectors is summarized. Finally, recent advances in the study of light nuclei from lattice QCD are addressed, and the scope of future investigations that are currently envisioned is outlined.
Comments:
45 pages
Subjects:
High Energy Physics — Lattice (hep-lat); High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
arXiv:
1904.09512 [pdf]
EPJA(2019)·104 citations
08
[Submitted on 21 Apr 2019] (cross-list from astro-ph.SR)
The Nucleosynthesis and Reaction Rates of Fluorine 19 ( $^{19} F$ ) in the Sun
Mohammad K. Mardini · Nidal Ershiadat · Mashhoor A. Al-Wardat · Ali A. Taani · Sergen Ozdemir · Hamid Al-Naimiy · Awni Khasawneh
We investigate the abundance of $^{19} F$ in the Sun through the nucleosynthesis scenario. In addition, we calculate the rate equations and reaction rates of the nucleosynthesis of $^{19} F$ at different temperature scale. Other important functions of this nucleosynthesis (nuclear partition function and statistical equilibrium conditions) are also obtained. The resulting stability of $^{19} F$ occurs at nucleus with A = 19 and Mass Excess= -1.4874 MeV. As a result, this will tend to a series of neutron captures and beta-decay until $^{19} F$ is produced. The reaction rate of $^{15} N$ ( $α$ , $γ$ ) $^{19} F$ was dominated by the contribution of three low-energy resonances, which enhanced the final $^{19} F$ abundance in the envelope.
Comments:
arXiv admin note: substantial text overlap with arXiv:astro-ph/0407551 by other authors
Subjects:
Solar and Stellar Astrophysics (astro-ph.SR); Astrophysics of Galaxies (astro-ph.GA); Nuclear Theory (nucl-th)
arXiv:
1904.09608 [pdf]
J.Phys.Conf.Ser.(2019)·3 citations
09
[Submitted on 22 Apr 2019] (cross-list from hep-lat)
The Role of Lattice QCD in Searches for Violations of Fundamental Symmetries and Signals for New Physics
Vincenzo Cirigliano🇺🇸 · Zohreh Davoudi🇺🇸 · Tanmoy Bhattacharya🇺🇸 · Taku Izubuchi🇺🇸 · Phiala E. Shanahan🇺🇸 · Sergey Syritsyn🇺🇸 · Michael L. Wagman🇺🇸
This document is one of a series of whitepapers from the USQCD collaboration. Here, we discuss opportunities for Lattice Quantum Chromodynamics (LQCD) in the research frontier in fundamental symmetries and signals for new physics. LQCD, in synergy with effective field theories and nuclear many-body studies, provides theoretical support to ongoing and planned experimental programs in searches for electric dipole moments of the nucleon, nuclei and atoms, decay of the proton, $n$ - $n$ oscillations, neutrinoless double- $β$ decay of a nucleus, conversion of muon to electron, precision measurements of weak decays of the nucleon and of nuclei, precision isotope-shift spectroscopy, as well as direct dark matter detection experiments using nuclear targets. This whitepaper details the objectives of the LQCD program in the area of Fundamental Symmetries within the USQCD collaboration, identifies priorities that can be addressed within the next five years, and elaborates on the areas that will likely demand a high degree of innovation in both numerical and analytical frontiers of the LQCD research.
Comments:
A whitepaper by the USQCD Collaboration, 30 pages, 9 figures
Subjects:
High Energy Physics — Lattice (hep-lat); High Energy Physics — Experiment (hep-ex); High Energy Physics — Phenomenology (hep-ph); Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
arXiv:
1904.09704 [pdf]
EPJA(2019)·66 citations
10
[Submitted on 22 Apr 2019] (cross-list from astro-ph.SR)
Observability of sharp phase transitions in neutron stars
Sophia Han🇺🇸
With central densities as high as 5-10 times the nuclear saturation density, neutron stars exhibit extreme conditions that cannot be observed elsewhere. They are ideal astrophysical laboratories for probing the composition and properties of cold, ultra-dense matter. We shall discuss taking into account currently available data from observation, how to reveal possible sharp phase transitions in dense neutron star cores.
Comments:
8 pages, 4 figures; contribution to the AIP Proceedings of the Xiamen-CUSTIPEN Workshop on the EOS of Dense Neutron-Rich Matter in the Era of Gravitational Wave Astronomy, Jan. 3-7, 2019, Xiamen, China
Subjects:
Solar and Stellar Astrophysics (astro-ph.SR); High Energy Astrophysical Phenomena (astro-ph.HE); Nuclear Theory (nucl-th)
arXiv:
1904.09918 [pdf]
AIP Conf.Proc.(2019)·4 citations
11
[Submitted on 22 Apr 2019] (cross-list from hep-lat)
Lattice QCD and Neutrino-Nucleus Scattering
Andreas S. Kronfeld🇺🇸 · David G. Richards🇺🇸 · William Detmold🇺🇸 · Rajan Gupta🇺🇸 · Huey-Wen Lin🇺🇸 · Keh-Fei Liu🇺🇸 · Aaron S. Meyer🇺🇸 · Raza Sufian🇺🇸 · Sergey Syritsin🇺🇸
This document is one of a series of whitepapers from the USQCD collaboration. Here, we discuss opportunities for lattice QCD in neutrino-oscillation physics, which inevitably entails nucleon and nuclear structure. In addition to discussing pertinent lattice-QCD calculations of nucleon and nuclear matrix elements, the interplay with models of nuclei is discussed. This program of lattice- QCD calculations is relevant to current and upcoming neutrino experiments, becoming increasingly important on the timescale of LBNF/DUNE and HyperK.
Comments:
33 pp. One of seven whitepapers from the USQCD Collaboration
Subjects:
High Energy Physics — Lattice (hep-lat); High Energy Physics — Experiment (hep-ex); High Energy Physics — Phenomenology (hep-ph); Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
arXiv:
1904.09931 [pdf]
EPJA(2019)·94 citations

Affiliations

first authorsco-authorsvia INSPIRE