Nuclear Theory·nucl-th

Monday·October 2, 2023

13 papers—7 primary·6 cross-listed

01
[Submitted on 28 Sept 2023]
Isospectral Potentials and Quantum Mechanical Functions for Neutron-Neutron Scattering
Anil Khachi
In this paper we have constructed inverse isospectral potentials for 1S0-nn state by fitting the experimental SPS using Variational Monte-Carlo technique in tandem with PFM technique. The isospectral potentials are obtained such that the cost measure i.e., mean absolute error (MAE) between the obtained and experimental SPS are less than 1 and the parameters give the low energy scattering parameters (`a' and `re') very close to the experimental values. The S-channel SPS for 1S0-nn have been obtained, with a MAE with respect to experimental data for lab energies up to 350 MeV, to less than 1.
Comments:
15 pages, 5 figures
Subjects:
Nuclear Theory (nucl-th)
arXiv:
2309.16780 [pdf]
2 citations
02
[Submitted on 28 Sept 2023]
A Bayesian study of quark models in view of recent astrophysical constraints
Franciele M. da Silva🇧🇷 · Adamu Issifu🇧🇷 · Luiz L. Lopes🇧🇷 · Luis C. N. Santos🇵🇰 · Débora P. Menezes🇧🇷
In this work, we perform a comparative analysis between the density-dependent quark model and the vector MIT bag model using Bayesian analysis. We use the equations of state generated by these two models to describe quark stars. We impose four recent observational astrophysical constraints on both models to determine their model-dependent parameters in an optimized manner assuming that the compact objects observed are composed entirely of self-bound quarks. The restrictions are aimed at producing stars with maximum masses $2 - 2.35$ M $_{⊙}$ and a mass-radii diagram compatible with the observed pulsars: PSR J0740+6620, PSR J0952-0607, PSR J0030+0451 and the compact object XMMU J173203.3-344518. With this analysis, the parameter dependence of the nuclear equation of state (EoS) of both models is restricted.
Comments:
Published Version
Subjects:
Nuclear Theory (nucl-th)
arXiv:
2309.16865 [pdf]
PRD(2024)·15 citations
03
[Submitted on 28 Sept 2023]
Nucleonic Shells and Nuclear Masses
Landon Buskirk · Kyle Godbey · Witold Nazarewicz · Wojciech Satula
The binding energy of an isotope is a sensitive indicator of the underlying shell structure as it reflects the net energy content of a nucleus. Since magic nuclei are significantly lighter, or more bound, compared to their neighbors, the presence of nucleonic shell structure makes an imprint on nuclear masses. In this work, using a carefully designed binding-energy indicator, we catalog the appearance of spherical and deformed shell and subshell closures throughout the nuclear landscape. After presenting experimental evidence for shell and subshell closures as seen through the lens of nuclear masses, we study the ability of global nuclear mass models to predict local binding-energy variations related to shell effects.
Comments:
12 pages, 8 figures, 1 table
Subjects:
Nuclear Theory (nucl-th); Nuclear Experiment (nucl-ex)
arXiv:
2309.16871 [pdf]
PRC(2024)·15 citations
04
[Submitted on 28 Sept 2023]
Data-driven reevaluation of $f t$ -values in superallowed $β$ decays
Chien-Yeah Seng🇺🇸 · Mikhail Gorchtein🇩🇪
We present a comprehensive re-evaluation of the $f t$ values in superallowed nuclear $β$ decays crucial for the precise determination of $V_{u d}$ and low-energy tests of the electroweak Standard Model. It consists of the first, fully data-driven analysis of the nuclear $β$ decay form factor, that utilizes isospin relations to connect the nuclear charged weak distribution to the measurable charge distributions. This prescription supersedes previous shell-model estimations, and allows for a rigorous quantification of theory uncertainties in $f$ which is absent in the existing literature. Our new evaluation shows an overall downward shift of the central values of $f$ at the level of 0.01\%.
Comments:
Version accepted by PRC
Subjects:
Nuclear Theory (nucl-th); High Energy Physics — Experiment (hep-ex); High Energy Physics — Phenomenology (hep-ph); Nuclear Experiment (nucl-ex)
arXiv:
2309.16893 [pdf]
PRC(2024)·25 citations
05
[Submitted on 29 Sept 2023]
Possible inconsistency between phenomenological and theoretical determinations of charge symmetry breaking in nuclear energy density functionals
Tomoya Naito · Gianluca Colò · Tetsuo Hatsuda · Haozhao Liang · Xavier Roca-Maza · Hiroyuki Sagawa
We summarize the recent progress on the determination of the charge symmetry breaking term of nuclear energy density functionals. We point out that the strength of the term determined theoretically is remarkably smaller than that determined phenomenologically, which is still an open question.
Comments:
The 7th International Conference on Collective Motion in Nuclei under Extreme Conditions (COMEX7)
Subjects:
Nuclear Theory (nucl-th); Nuclear Experiment (nucl-ex)
arXiv:
2309.17060 [pdf]
Nuovo Cim.C(2024)·3 citations
06
[Submitted on 29 Sept 2023]
Nuclear Modification Factor in Pb-Pb and p-Pb collisions at $s_{N N}$ =5.02 TeV at LHC energies using Boltzmann Transport Equation with Tsallis Blast Wave Description
Aditya Kumar Singh🇮🇳 · Aviral Akhil🇮🇳 · Swatantra Kumar Tiwari🇮🇳 · Pooja Pareek🇮🇳
In this article, we have studied the nuclear modification factor measured in Pb-Pb collisions ( $R_{P b P b}$ ) for $π^{\pm}$ , $K^{\pm}$ , $p + p ˉ$ , $K^{* 0} + K^{* 0} ˉ$ , $ϕ$ and in p-Pb collisions ( $R_{pP b}$ ) for $π^{\pm}$ , $K^{\pm}$ , $p + p ˉ$ at Large hadron collider (LHC) energy of $s_{N N}$ = 5.02 TeV for the most central and peripheral collisions. We have also analysed the experimental data of transverse momentum ( $p_{T}$ ) spectra for these identified hadrons at LHC for Pb-Pb as well as for p-Pb collisions. We have used Boltzmann transport equation (BTE) in relaxation time approximation (RTA) for this analysis. The Tsallis statistics is used as an initial distribution function and The Tsallis blast wave (TBW) model is employed as an equilibrium distribution in BTE. The present model fits the measured transverse momentum spectra, $R_{P b P b}$ , and $R_{pP b}$ successfully upto $p_{T}$ = 8 GeV with a reasonable $χ^{2} / n df$ for all the considered hadrons at various centralities. The experimental data for $R_{pP b}$ are generated using the particle yields at pPb and pp collisions where number of binary collisions are taken from Glauber model calculations. We find that the average transverse flow velocity ( $< β_{r} >$ ) follows the mass and centrality ordering and decreases with the mass as well as when one move from the central collisions to peripheral collisions. These findings are inline with the results of the hydrodynamical calculations.
Comments:
10 pages, 5 figures, 1 table, submitted for publication as regular article
Subjects:
Nuclear Theory (nucl-th); High Energy Physics — Experiment (hep-ex); High Energy Physics — Phenomenology (hep-ph); Nuclear Experiment (nucl-ex)
arXiv:
2309.17071 [pdf]
Eur.Phys.J.Plus(2024)·5 citations
07
[Submitted on 29 Sept 2023]
Properties of charge-exchange giant spin-dipole resonances in medium-heavy closed-shell parent nuclei: a semimicroscopic description
V. I. Bondarenko · M. Y. Urin
The semimicroscopic particle-hole dispersive optical model is adapted for a description of main properties of charge-exchange giant spin-multipole resonances in medium-heavy closed-shell parent nuclei. The adapted model is implemented to evaluating the strength functions, transition densities, and branching ratios of direct one-nucleon decay for charge-exchange giant spin-dipole resonances in the ^{48}Ca, ^{90}Zr, ^{132}Sn, and ^{208}Pb parent nuclei. Some of calculation results are compared with available experimental data.
Comments:
41 pages, 11 figures
Subjects:
Nuclear Theory (nucl-th)
arXiv:
2309.17173 [pdf]
PRC(2024)·3 citations

Affiliations

first authorsco-authorsvia INSPIRE

Isospectral Potentials and Quantum Mechanical Functions for Neutron-Neutron Scattering

A Bayesian study of quark models in view of recent astrophysical constraints

Nucleonic Shells and Nuclear Masses

Data-driven reevaluation of ft-values in superallowed β decays

Possible inconsistency between phenomenological and theoretical determinations of charge symmetry breaking in nuclear energy density functionals

Nuclear Modification Factor in Pb-Pb and p-Pb collisions at sNN​​=5.02 TeV at LHC energies using Boltzmann Transport Equation with Tsallis Blast Wave Description

Properties of charge-exchange giant spin-dipole resonances in medium-heavy closed-shell parent nuclei: a semimicroscopic description

Affiliations

Data-driven reevaluation of $f t$ -values in superallowed $β$ decays

Nuclear Modification Factor in Pb-Pb and p-Pb collisions at $s_{N N}$ =5.02 TeV at LHC energies using Boltzmann Transport Equation with Tsallis Blast Wave Description