Nuclear Theory·nucl-th

Monday·July 3, 2023

7 papers—2 primary·5 cross-listed

01
[Submitted on 29 Jun 2023]
Improved sd shell effective interactions from Daejeon16
Ik Jae Shin🇰🇷 · Nadezda A. Smirnova🇫🇷 · Andrey M. Shirokov🇷🇺 · Zuxing Yang🇯🇵 · Bruce R. Barrett🇺🇸 · Zhen Li🇫🇷 · Youngman Kim🇰🇷 · Pieter Maris🇺🇸 · James P. Vary🇺🇸
We present new microscopic effective shell-model interactions in the valence sd shell, obtained from the modern Daejeon16 nucleon-nucleon potential using no-core shell-model (NCSM) wave functions of 18F at Nmax=6 (total oscillator quanta of excitation) model space and the Okubo-Lee-Suzuki transformation. First, we explore the convergence properties of our calculations and show that the excitation energies of states in 18F, characterized by the largest valence-like configurations, are reasonably converged and the lowest states are in sensible agreement with experiment. Then, we investigate the monopole properties of that interaction in comparison with the phenomenological universal sd-shell interaction, USDB, and with the previously derived interaction at Nmax=4. Theoretical binding energies and low-energy spectra of the O isotopes, as well as low-energy spectra of a selection of $s d$ -shell nuclei, are presented. We conclude that the use of larger-space NCSM wave functions leads to a noticeable improvement in the quality of the derived effective interaction. We propose monopole modifications of the Daejeon16 centroids which further improve the agreement with experiment throughout the sd shell, as demonstrated by a compilation of spectra contained in Supplemental Material.
Comments:
arXiv admin note: text overlap with arXiv:1909.00628
Subjects:
Nuclear Theory (nucl-th)
arXiv:
2306.17289 [pdf]
PRC(2024)·4 citations
02
[Submitted on 30 Jun 2023]
Repulsive $Λ$ potentials in dense neutron star matter and binding energy of $Λ$ in hypernuclei
Asanosuke Jinno🇯🇵 · Koichi Murase🇯🇵 · Yasushi Nara🇯🇵 · Akira Ohnishi🇯🇵
The repulsive three-body force between the lambda ( $Λ$ ) hyperon and medium nucleons is a key element in solving the hyperon puzzle in neutron stars. We investigate the binding energies of $Λ$ hyperon in hypernuclei to verify the repulsive $Λ$ potentials from the chiral effective field theory ( $χ$ EFT) employing the Skyrme Hartree-Fock method. We find that the $χ$ EFT $Λ$ potential with the $Λ N N$ three-body forces reproduces the existing hypernuclear binding energy data, whereas the $Λ$ binding energies are overestimated without the $Λ N N$ three-body force. Additionally, we search for the parameter space of the $Λ$ potentials by varying the Taylor coefficients of the $Λ$ potential and the effective mass of $Λ$ at the saturation density. Our analysis demonstrates that the parameter region consistent with the $Λ$ binding energy data spans a wide range of the parameter space, including even more repulsive potentials than the $χ$ EFT prediction. We confirm that these strong repulsive $Λ$ potentials suppress the presence of $Λ$ in the neutron star matter. We found that the $Λ$ potentials repulsive at high densities are favored when the depth of the $Λ$ potential at the saturation density, $U_{Λ} (ρ_{0}) = J_{Λ}$ , is $J_{Λ} ≳ - 29 MeV$ , while attractive ones are favored when $J_{Λ} ≲ - 31 MeV$ . This suggests that the future high-resolution data of hypernuclei could rule out the scenario in which $Λ$ s appear through the precise determination of $J_{Λ}$ within the accuracy of $1 MeV$ .
Comments:
15 pages, 11 figures, 3 tables, figures updated and extended, (Published in Physical Review C)
Subjects:
Nuclear Theory (nucl-th); Nuclear Experiment (nucl-ex)
arXiv:
2306.17452 [pdf]
PRC(2023)·25 citations
03
[Submitted on 30 Jun 2023] (cross-list from astro-ph.HE)
Influence of Dark Matter on the Magnetized Neutron Star
Vishal Parmar🇮🇳 · H. C. Das🇮🇹 · M. K. Sharma🇮🇳 · S. K. Patra🇮🇳
Over the past two decades, significant strides have been made in the study of Dark Matter (DM) admixed neutron stars and their associated properties. However, an intriguing facet regarding the effect of DM on magnetized neutron stars still remains unexplored. This study is carried out to analyze the properties of DM admixed magnetized neutron stars. The equation of state for the DM admixed neutron star is calculated using the relativistic mean-field model with the inclusion of a density-dependent magnetic field. Several macroscopic properties, such as mass, radius, particle fractions, tidal deformability, and the $f$ -mode frequency, are calculated with different magnetic field strengths and DM configurations. The equation of state is softer with the presence of DM as well as for the parallel components of the magnetic field and vice-versa for the perpendicular one. Other macroscopic properties, such as mass, radius, tidal deformability, etc., are also affected by both DM and magnetic fields. The change in the magnitude of different neutron star observables is proportional to the amount of DM percentage and the strength of the magnetic field. We observe that the change is seen mainly in the core part of the star without affecting the crustal properties.
Comments:
10 pages, 6 figures, Published in Phys. Rev. D
Subjects:
High Energy Astrophysical Phenomena (astro-ph.HE); Nuclear Theory (nucl-th)
arXiv:
2306.17510 [pdf]
PRD(2023)·8 citations
04
[Submitted on 30 Jun 2023] (cross-list from nucl-ex)
Study of Reaction Mechanism and Dependence of Incomplete Fusion on Projectile Energy and Entrance Channel Mass-Asymmetry of 12C + 169Tm, 16O + 169Tm And 16O + 75As Systems At 4-7.5MeV/Nucleon Energy Beam
Getahun Kebede
This study focus on the correlation between entrance channel properties and incomplete fusion reaction. The dynamics of heavy-ion fusion reactions involved in the interaction of 12C and 16O with 169Tm and 75As targets were examined at 3-8MeV/nucleon specific energies. The influence of projectile energy and entrance channel mass-asymmetry on the incomplete fusion process in the interaction of 12C + 169Tm, 16O + 169Tm and 16O + 75As systems at energies ranging from 4-7.5 MeV/Nucleon was examined in this study. The PACE4 statistical model was used to compare and analyze the measured cross sections from the EXFOR data base. The values of level density parameter, which is a sensitive input parameter, were optimized using a representative non-a-emitting channel from the respective systems. The experimentally measured excitation functions for representative non {\alpha}-emitting channels were found to be in good agreement with the theoretical predictions in general. However, for {\alpha}-emitting channels in the current systems, the measured excitation functions were greater than the theoretical model code predictions, which could be attributed to incomplete fusion reaction at these energies. The observed enhancements in {\alpha}-emitting channels were attributable to the contribution coming from incomplete fusion reactions. The incomplete fusion fraction, which explains the relative relevance of incomplete fusion processes, was attempted to be approximated. The incomplete fusion fraction was shown to be sensitive to the projectile energy and mass-asymmetry of the entrance channel. Further, the results showed that incomplete fusion reactions were higher for more mass-asymmetric systems than mass-symmetric one.
Comments:
arXiv admin note: text overlap with arXiv:1907.01836 by other authors
Subjects:
Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
arXiv:
2306.17552 [pdf]
0 citations
05
[Submitted on 30 Jun 2023] (cross-list from hep-ph)
HBT signature for clustered substructures probing primordial inhomogeneity in hot and dense QCD matter
Kenji Fukushima🇯🇵 · Yoshimasa Hidaka🇯🇵 · Katsuya Inoue🇯🇵 · Kenta Shigaki🇯🇵 · Yorito Yamaguchi🇯🇵
We propose a novel approach to probe primordial inhomogeneity in hot and dense matter which could be realized in non-central heavy-ion collisions. Although the Hanbury Brown and Twiss (HBT) interferometry is commonly used to infer the system size, the cluster size should be detected if substructures emerge in space. We demonstrate that a signal peak in the HBT two-particle correlation stands at the relative momentum corresponding to the spatial scale of pseudo one-dimensional modulation. We assess detectability using the data prepared by an event generator (AMPT model) with clustering implemented in the particle distribution.
Comments:
5 pages, 4 figures
Subjects:
High Energy Physics — Phenomenology (hep-ph); Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
arXiv:
2306.17619 [pdf]
PRC(2024)·13 citations
06
[Submitted on 30 Jun 2023] (cross-list from hep-ph)
Proton structure functions in the dipole picture at next-to-leading order
Henri Hänninen🇫🇮 · Heikki Mäntysaari🇫🇮 · Risto Paatelainen🇫🇮 · Jani Penttala🇫🇮
We predict heavy quark production cross sections in Deep Inelastic Scattering at high energy by applying the CGC effective theory. We demonstrate that when the calculation is performed consistently at next-to-leading order accuracy with massive quarks it becomes possible, for the first time in the dipole picture with perturbatively calculated center-of-mass energy evolution, to simultaneously describe both light and heavy quark production data at small $x$ . We furthermore show how the heavy quark cross section data provides additional strong constraints on the extracted non-perturbative initial condition for the small- $x$ evolution equations.
Comments:
5 pages, 4 figures. Talk by H.M. at DIS2023
Subjects:
High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
arXiv:
2306.17707 [pdf]
0 citations
07
[Submitted on 30 Jun 2023] (cross-list from hep-ph)
Ambiguities in Partial Wave Analysis of Two Spinless Meson Photoproduction
JPAC Collaboration: W. A. Smith🇺🇸 · D. I. Glazier🇬🇧 · V. Mathieu🇪🇸 · M. Albaladejo🇪🇸 · M. Albrecht🇺🇸 · Z. Baldwin🇺🇸 · C. Fernández-Ramírez🇪🇸 · N. Hammoud🇵🇱 · M. Mikhasenko🇩🇪 · G. Montaña🇺🇸 · R. J. Perry🇪🇸 · A. Pilloni🇮🇹 and 3 other authors
We describe the formalism to analyze the mathematical ambiguities arising in partial-wave analysis of two spinless mesons produced with a linearly polarized photon beam. We show that partial waves are uniquely defined when all accessible observables are considered, for a wave set which includes $S$ and $D$ waves. The inclusion of higher partial waves does not affect our results, and we conclude that there are no mathematical ambiguities in partial-wave analysis of two mesons produced with a linearly polarized photon beam. We present Monte Carlo simulations to illustrate our results.
Comments:
11 pages, 8 figures
Subjects:
High Energy Physics — Phenomenology (hep-ph); Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
arXiv:
2306.17779 [pdf]
PRD(2023)·10 citations

Affiliations

first authorsco-authorsvia INSPIRE

Improved sd shell effective interactions from Daejeon16

Repulsive Λ potentials in dense neutron star matter and binding energy of Λ in hypernuclei

Influence of Dark Matter on the Magnetized Neutron Star

Study of Reaction Mechanism and Dependence of Incomplete Fusion on Projectile Energy and Entrance Channel Mass-Asymmetry of 12C + 169Tm, 16O + 169Tm And 16O + 75As Systems At 4-7.5MeV/Nucleon Energy Beam

HBT signature for clustered substructures probing primordial inhomogeneity in hot and dense QCD matter

Proton structure functions in the dipole picture at next-to-leading order

Ambiguities in Partial Wave Analysis of Two Spinless Meson Photoproduction

Affiliations

Repulsive $Λ$ potentials in dense neutron star matter and binding energy of $Λ$ in hypernuclei