Nuclear Theory·nucl-th

Wednesday·January 12, 2022

6 papers—4 primary·2 cross-listed

01
[Submitted on 10 Jan 2022]
Weak binding effects on the structure of $^{40}$ Mg
A. O. Macchiavelli · H. L. Crawford · P. Fallon · R. M. Clark · A. Poves
While the phenomenon of one- and two-neutron ground-state halo nuclei is well established, the effects of weak binding on nuclear excitation properties remain largely unexplored. Motivated by this question and by recent data in $^{40}$ Mg we investigate the coupling of weakly bound (halo) valence neutrons to a core using the known properties of $^{40}$ Mg to explore and illustrate possible particle-core coupling schemes and their impact on the low-lying excitation spectrum.
Comments:
7 pages, 7 figures
Subjects:
Nuclear Theory (nucl-th); Nuclear Experiment (nucl-ex)
arXiv:
2201.03618 [pdf]
EPJA(2022)·9 citations
02
[Submitted on 11 Jan 2022]
Study of threshold anomaly in elastic scattering of $^{14}$ N by $^{56}$ Fe and $^{90}$ Zr
K. K. Jena · S. Senapati · B. B. Sahu · Jajati K. Nayak · S. K. Agarwalla
We use a phenomenological nucleus-nucleus optical potential constructed in the light of a potential developed by Ginocchio to study the elastic angular distributions of different nuclear systems near Coulomb barrier. The differential cross section ratios of elastic to Rutherford are studied for systems $^{14}$ N+ $^{56}$ Fe and $^{14}$ N+ $^{90}$ Zr for several colliding energies. Our theoretical predictions are well competitive with the experimental data, and the significantly small imaginary part of the potential explains the elastic scattering cross section and threshold anomaly in both systems.
Comments:
9 pages, 17 figures
Subjects:
Nuclear Theory (nucl-th); Nuclear Experiment (nucl-ex)
arXiv:
2201.03805 [pdf]
2 citations
03
[Submitted on 11 Jan 2022]
Bayesian inference of finite-nuclei observables based on the KIDS model
Jun Xu · Panagiota Papakonstantinou
Bayesian analyses on both isoscalar and isovector nuclear interaction parameters are carried out based on the Korea-IBS-Daegu-SKKU (KIDS) model under the constraints of nuclear structure data of $^{208}$ Pb and $^{120}$ Sn. Under the constraint of the neutron-skin thickness, it is found that incorporating the curvature parameter $K_{sy m}$ of nuclear symmetry energy as an independent variable significantly broadens the posterior probability distribution function (PDF) of the slope parameter $L$ , and affects the related correlations. Typically, the anticorrelation between $L$ and the symmetry energy at saturation density disappears, while a positive correlation between $L$ and $K_{sy m}$ is observed. Under the constraint of the isoscalar giant monopole resonance (ISGMR), incorporating the skewness parameter as an independent variable also significantly broadens the posterior PDF of the nuclear matter incompressibility $K_{0}$ . Even with the broad uncertainties of higher-order parameters of the equation of state (EOS), robust constraints of $L < 90$ MeV and $K_{0} < 270$ MeV are obtained. Our study quantifies the consistency between the constraints on $L$ from the neutron-skin data of PREXII and isovector giant dipole resonance (IVGDR) data, and the constraints on $K_{0}$ from the data of ISGMR in $^{208}$ Pb and $^{120}$ Sn.
Comments:
18 pages, 17 figures
Subjects:
Nuclear Theory (nucl-th); Nuclear Experiment (nucl-ex)
arXiv:
2201.03835 [pdf]
PRC(2022)·26 citations
04
[Submitted on 11 Jan 2022]
Quarkyonic matter state of neutron stars
Gaoqing Cao🇨🇳
This work extends our previous study of isospin symmetric quarkyonic matter to quarkyonic neutron matter which might be relevant to the inner cores of neutron stars. The vector-isovector $ρ$ mesons are introduced to the model mainly to account for isospin density interactions, just like $ω$ meson for baryon density interactions. The modified Lagrangian still preserves approximate chiral symmetry which could be significantly broken at lower density. And new free parameters are fixed by adopting the experimental constraints on the symmetry energy and its slope at saturation density. Eventually, the pressure, mass-radius relation, and tidal deformability are explored in advance for the quarkyonic neutron stars. While the pressure and tidal deformability are well consistent with experimental and observational restrictions, the mass-radius relation is unable to reproduce the observed two solar mass of PSR J0740+6620.
Subjects:
Nuclear Theory (nucl-th); High Energy Physics — Phenomenology (hep-ph)
arXiv:
2201.03875 [pdf]
PRD(2022)·18 citations
05
[Submitted on 10 Jan 2022] (cross-list from physics.atom-ph)
Evidence of Two-Source King Plot Nonlinearity in Spectroscopic Search for New Boson
Joonseok Hur🇺🇸 · Diana P. L. Aude Craik🇺🇸 · Ian Counts🇺🇸 · Eugene Knyazev🇺🇸 · Luke Caldwell🇺🇸 · Calvin Leung🇺🇸 · Swadha Pandey🇺🇸 · Julian C. Berengut🇦🇺 · Amy Geddes🇦🇺 · Witold Nazarewicz🇺🇸 · Paul-Gerhard Reinhard🇩🇪 · Akio Kawasaki🇯🇵 and 3 other authors
Optical precision spectroscopy of isotope shifts can be used to test for new forces beyond the Standard Model, and to determine basic properties of atomic nuclei. We measure isotope shifts on the highly forbidden $^{2} S_{1/2} \to^{2} F_{7/2}$ octupole transition of trapped $^{168, 170, 172, 174, 176}$ Yb ions. When combined with previous measurements in Yb $^{+}$ and very recent measurements in Yb, the data reveal a King plot nonlinearity of up to 240 $σ$ . The trends exhibited by experimental data are explained by nuclear density functional theory calculations with the Fayans functional. We also find, with 4.3 $σ$ confidence, that there is a second distinct source of nonlinearity, and discuss its possible origin.
Subjects:
Atomic Physics (physics.atom-ph); High Energy Physics — Experiment (hep-ex); Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
arXiv:
2201.03578 [pdf]
PRL(2022)·75 citations
06
[Submitted on 7 Jan 2022] (cross-list from hep-ph)
Neutrinos at FPF
Ulrich Mosel🇩🇪 · Kai Gallmeister🇩🇪
The GiBUU model is used to obtain information on possible neutrino-nucleus events at the proposed Forward Physics Facility (FPF) at CERN. An FPF neutrino program could contribute to fundamental questions such as formation times, color transparency and the EMC effect for neutrinos.
Comments:
Contribution to Forward Physics Facility White Paper
Subjects:
High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Experiment (hep-ex); Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
arXiv:
2201.04008 [pdf]
7 citations

Affiliations

first authorsco-authorsvia INSPIRE

Weak binding effects on the structure of 40Mg

Study of threshold anomaly in elastic scattering of 14N by 56Fe and 90Zr

Bayesian inference of finite-nuclei observables based on the KIDS model

Quarkyonic matter state of neutron stars

Evidence of Two-Source King Plot Nonlinearity in Spectroscopic Search for New Boson

Neutrinos at FPF

Affiliations

Weak binding effects on the structure of $^{40}$ Mg

Study of threshold anomaly in elastic scattering of $^{14}$ N by $^{56}$ Fe and $^{90}$ Zr