Nuclear Theory·nucl-th

Tuesday·May 28, 2019

17 papers—8 primary·9 cross-listed

01
[Submitted on 24 May 2019]
Rescattering effects in antiproton-induced exclusive $J / ψ$ and $ψ^{'}$ production on the deuteron
A.B. Larionov🇩🇪 · A. Gillitzer🇩🇪 · M. Strikman🇺🇸
On the basis of the generalized eikonal approximation we study the exclusive reactions $p ˉ d \to J / ψ n$ and $p ˉ d \to ψ^{'} n$ in vicinity of the thresholds for charmonium production on a free proton target. It is shown that the rescattering of the incoming antiproton and outgoing charmonium on the spectator neutron leads to a depletion of the charmonium production at low- and to an enhancement at high transverse momenta. This is in qualitative agreement with previous studies of hard proton knockout in proton-deuteron collisions. We analyze different physical sources of uncertainty which may influence the extraction of the total charmonium-neutron cross section. The color transparency effect for the incoming $p ˉ$ largely compensates the influence of charmonium rescattering both at low and high transverse momenta. Different choices of the deuteron wave function lead to significant uncertainties at high transverse momenta. As an outcome of the calculations of charmonium production, we also provide predictions on the production of open charm hadrons due to the dissociation of the charmonium on the neutron. It is shown that the open charm production cross section is proportional to the total charmonium-nucleon cross section and quite stable with respect to the variation of other parameters of the model. We thus suggest that open charm channels are most suited for future studies of charmonium-nucleon interactions at PANDA with a deuteron target.
Comments:
28 pages, 8 figures, modified sec. 1 and 2, new Fig. 2, added references, results unchanged, version accepted in EPJA
Subjects:
Nuclear Theory (nucl-th); High Energy Physics — Experiment (hep-ex); High Energy Physics — Phenomenology (hep-ph); Nuclear Experiment (nucl-ex)
arXiv:
1905.10419 [pdf]
EPJA(2019)·3 citations
02
[Submitted on 24 May 2019]
Ab initio limits of atomic nuclei
S. R. Stroberg · J. D. Holt · A. Schwenk · J. Simonis
We predict the limits of existence of atomic nuclei, the proton and neutron drip lines, from the light through medium-mass regions. Starting from a chiral two- and three-nucleon interaction with good saturation properties, we use the valence-space in-medium similarity renormalization group to calculate ground-state and separation energies from helium to iron, nearly 700 isotopes in total. We use the available experimental data to quantify the theoretical uncertainties for our ab initio calculations towards the drip lines. Where the drip lines are known experimentally, our predictions are consistent within the estimated uncertainty. For the neutron-rich sodium to chromium isotopes, we provide predictions to be tested at rare-isotope beam facilities.
Comments:
6 pages, 3 figures, supplementary material included; accepted for publication in Physical Review Letters
Subjects:
Nuclear Theory (nucl-th); Nuclear Experiment (nucl-ex)
arXiv:
1905.10475 [pdf]
PRL(2021)·267 citations
03
[Submitted on 25 May 2019]
A microscopic resolution of the chiral conundrum with crossing twin bands in Ag-106
P. W. Zhao · Y. K. Wang · Q. B. Chen
The nuclear chiral conundrum with crossing twin bands is investigated with three-dimensional tilted axis cranking covariant density functional theory in a fully self-consistent and microscopic way. The energy spectra and electromagnetic transition strengths for bands 1 and 2 in Ag-106 are well reproduced with two distinct configurations with two and four quasiparticles, respectively. For the four-quasiparticle configuration, a chiral vibrational band on top of band 2 is expected due to the soft Routhian curves. Therefore, it provides a microscopic and solid solution for the chiral conundrum in Ag-106. It also paves the way for understanding similar chiral structure in other nuclei in the future..
Comments:
6 pages, 4 figures
Subjects:
Nuclear Theory (nucl-th); Nuclear Experiment (nucl-ex)
arXiv:
1905.10544 [pdf]
PRC(2019)·22 citations
04
[Submitted on 25 May 2019]
Heavy flavor dissociation in the framework of multi-body Dirac equations
Shuzhe Shi🇨🇳 · Jiaxing Zhao🇨🇳 · Pengfei Zhuang🇨🇳
We study heavy flavor properties at finite temperature in the framework of a relativistic potential model. With an improved method to solve the three-body Dirac equation, we determine a universal set of model parameters for both mesons and baryons by fitting heavy flavor masses in vacuum. Taking heavy quark potential from lattice QCD simulations in hot medium, we systematically calculate heavy flavor binding energies and averaged sizes as functions of temperature. The meson and baryons are separately sequentially dissociated in the quark-gluon plasma, and the mesons can survive at higher temperature due to the stronger potential between quark-antiquark pairs than that between quark-quark pairs.
Comments:
10 pages, 5 figures; published version, previously entitled "Heavy flavor hadrons from multi-body Dirac equations"
Subjects:
Nuclear Theory (nucl-th); High Energy Physics — Phenomenology (hep-ph)
arXiv:
1905.10627 [pdf]
CPC(2020)·23 citations
05
[Submitted on 26 May 2019]
Effects of $ϕ_{0}$ -meson on the EOS of hyperon star in the relativistic mean field model
S. K. Biswal
Nuclear effective interactions are considered as a vital tool to guide into the region of the high degree of isospin asymmetry and density. We take varieties of parameter sets of the RMF model to show the parametric dependence of the hyperon star properties. We add $ϕ_{0}$ -meson to $σ$ - $ω$ - $ρ$ model. The effects of $ϕ_{0}$ -meson on the equation of state and consequently on the maximum mass of the hyperon star are discussed. Due to the inclusion of $ϕ_{0}$ -meson the threshold density of different hyperon production shift to higher density region. The effects of the hyperon-meson coupling constants on the maximum mass and radius of the hyperon stars are discussed.
Subjects:
Nuclear Theory (nucl-th)
arXiv:
1905.10880 [pdf]
AIP Conf.Proc.(2019)·8 citations
06
[Submitted on 27 May 2019]
Gravitational Wave Signatures of Highly Magnetized Neutron Stars
Cesar V. Flores🇧🇷 · Luiz L. Lopes🇧🇷 · Luis B. Castro🇧🇷 · Débora P. Menezes🇧🇷
Motivated by the recent gravitational wave detection by the LIGO-VIRGO observatories, we study the Love number and dimensionless tidal polarizability of highly magnetized stars. We also investigate the fundamental quasi-normal mode of neutron stars subject to high magnetic fields. To perform our calculations we use the chaotic field approximation and consider both nucleonic and hyperonic stars. As far as the fundamental mode is concerned, we conclude that the role played by the constitution of the stars is far more relevant than the intensity of the magnetic field and if massive stars are considered, the ones constituted by nucleons only present frequencies somewhat lower than the ones with hyperonic cores, a feature that can be used to point out the real internal structure of neutron stars. Moreover, our studies clearly indicate that strong magnetic fields play a crucial role in the deformability of low mass neutron stars, with possible consequences on the interpretation of the detected gravitational waves signatures.
Comments:
24 pages, 4 figures, 6 tables
Subjects:
Nuclear Theory (nucl-th); High Energy Astrophysical Phenomena (astro-ph.HE); High Energy Physics — Phenomenology (hep-ph)
arXiv:
1905.11170 [pdf]
EPJC(2020)·27 citations
07
[Submitted on 27 May 2019]
Parallel tale of seniority isomers in 130Cd and 206Hg: Testing the robustness of magic numbers
Bhoomika Maheshwari · Hasan Abu Kassim · Norhasliza Yusof · Ashok Kumar Jain
The neutron-rich nuclei 130Cd and 206Hg, so important in the astrophysical processes, may also be useful in tracking the evolution of nuclear shell gaps as one traverses the neutron-rich region. The high spin 8+ isomer in 130Cd and the 10+ isomer in 206Hg turn out to be the lampposts, which may shed light on the shell gaps and validity of the seniority scheme in the neutron-rich systems. We explore the robustness of the N=82 and N=126 magic numbers in the neutron-rich 130Cd and 206Hg nuclides, respectively. A parallel between the two nuclides in terms of the high-spin isomers allows us to investigate these waiting-point nuclei, which have limited experimental data, by using the concept of seniority as the stepping stone. In this paper, we report large scale shell model calculations by using the available realistic effective interactions derived from the Charge Dependent Bonn potential through the renormalized G matrix. We also explore if any change in the interaction is also required to consistently explain both the level structures as well the B(E2) values. A structural similarity between the 8+ isomer in 130Cd and the 10+ isomer in 206Hg is noticed due to goodness of seniority. They are found to possess a maximally aligned, seniority v = 2 configuration from their respective intruder orbits. No shell quenching seems to be needed for the seniority isomers in these nuclei. Therefore, N=82 and 126 appear to be very robust magic numbers even in the neutron-rich region.
Comments:
9 Figures
Subjects:
Nuclear Theory (nucl-th)
arXiv:
1905.11193 [pdf]
0 citations
08
[Submitted on 23 May 2019]
Constraining the properties of dense matter and neutron stars by combining nuclear physics and gravitational waves from GW170817
I. Tews🇺🇸 · J. Margueron🇫🇷 · S. Reddy🇺🇸
Gravitational waves from neutron-star mergers are expected to provide stringent constraints on the structure of neutron stars. At the same time, recent advances in nuclear theory have enabled reliable calculations of the low density equation of state using effective field theory based Hamiltonians and advanced techniques to solve the quantum many-body problem. In this paper, we address how the first observation of gravitational waves from GW170817 can be combined with modern calculations of the equation of state to extract useful insights about the equation of state of matter encountered inside neutron stars. We analyze the impact of various uncertainties and we show that the tidal deformability extracted from GW170817 is compatible, while less constraining, than modern nuclear physics knowledge.
Comments:
arXiv admin note: substantial text overlap with arXiv:1901.09874
Subjects:
Nuclear Theory (nucl-th); High Energy Astrophysical Phenomena (astro-ph.HE)
arXiv:
1905.11212 [pdf]
AIP Conf.Proc.(2019)·9 citations

Affiliations

first authorsco-authorsvia INSPIRE