Nuclear Theory·nucl-th

Monday·October 9, 2023

10 papers—1 primary·9 cross-listed

02
[Submitted on 5 Oct 2023] (cross-list from hep-lat)
Negative Coupling $ϕ^{4}$ on the Lattice
Paul Romatschke🇺🇸
Triviality of $ϕ^{4}$ theory in four dimensions can be avoided if the bare coupling constant is negative in the UV. Theories with negative coupling can be put on the lattice if the integration domain for $ϕ (x)$ is contour-deformed from the real to the complex domain. In 0+1d (quantum mechanics), one can recover results from $P T$ -symmetric quantum mechanics in this way. In this work, I report on an attempt to put negative coupling $ϕ^{4}$ theory in 4 dimensions on the lattice.
Comments:
7 pages, 3 figures, comments/criticism welcome
Subjects:
High Energy Physics — Lattice (hep-lat); High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Theory (hep-th); Nuclear Theory (nucl-th)
arXiv:
2310.03815 [pdf]
PoS(2024)·12 citations
03
[Submitted on 5 Oct 2023] (cross-list from physics.atom-ph)
Towards Precision Muonic X-Ray Measurements of Charge Radii of Light Nuclei
Ben Ohayon · Andreas Abeln · Silvia Bara · Thomas Elias Cocolios · Ofir Eizenberg · Andreas Fleischmann · Loredana Gastaldo · César Godinho · Michael Heines · Daniel Hengstler · Guillaume Hupin · Paul Indelicato and 11 other authors
We propose an experiment to measure the nuclear charge radii of light elements with up to 20~times higher accuracy. These are essential both for understanding nuclear physics at low energies, and for experimental and theoretical applications in simple atomic systems. Such comparisons advance the understanding of bound-state quantum electrodynamics and are useful for searching for new physics beyond the Standard Model. The energy levels of muonic atoms are highly susceptible to nuclear structure, especially to the mean square charge radius. The radii of the lightest nuclei (with the atomic number, $Z = 1, 2$ ) have been determined with high accuracy using laser spectroscopy in muonic atoms, while those of medium mass and above were determined using X-ray spectroscopy with semiconductor detectors. In this communication, we present a new experiment, aiming to obtain precision measurements of the radii of light nuclei $3 \leq Z \leq 10$ using single-photon energy measurements with cryogenic microcalorimeters; a quantum-sensing technology capable of high efficiency with outstanding resolution for low-energy X-rays.
Subjects:
Atomic Physics (physics.atom-ph); Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
arXiv:
2310.03846 [pdf]
MDPI Physics(2024)·28 citations
04
[Submitted on 6 Oct 2023] (cross-list from hep-ph)
Reduced cross sections of electron and neutrino charged current quasielastic scattering on nuclei
A.V. Butkevich🇷🇺
The semi-exclusive averaged reduced cross sections for (anti)neutrino charged current quasi-elastic scattering on carbon, oxygen, and argon are analyzed within the relativistic distorted wave impulse approximation. We found that these cross sections as functions of missing nucleon energy are similar to those of electron scattering and are in agreement with electron scattering data for three nuclei. The difference between the electron and neutrino cross sections can be attributed to Coulomb distortion on the electron wave function. The averaged reduced cross sections depend slowly upon incoming lepton energy. The approach presented in this paper provide novel constraints on nuclear models of quasi-elastic neutrino-nucleus scattering and can be easily applied to test spectral functions and final state interactions, employed in neutrino event generators.
Comments:
24 pages, 12 figures. arXiv admin note: text overlap with arXiv:0705.1051
Subjects:
High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
arXiv:
2310.04061 [pdf]
PRC(2024)·4 citations
05
[Submitted on 6 Oct 2023] (cross-list from hep-ph)
The Dilatonic Dynamics of Baryonic Crystals, Branes and Spheres
Jahmall Bersini🇯🇵 · Alessandra D'Alise🇮🇹 · Matias Torres🇮🇹 · Francesco Sannino🇮🇹
We systematically analyze the impact of dilatonic dynamics on Skyrme spheres, crystals and branes. The effects of the dilatonic model parameters, encompassing different underlying near-conformal dynamics, on the macroscopic properties of Skyrmions such as their mass and radius, are discussed. For spheres and crystals we identify special values of the ratio of the decay constants for which the second order differential equations reduce to a solvable first order system. Additionally, in the case of the crystals, the dilaton presence spatially separates the baryon and isospin charge distributions. For branes, we show how the dilaton smooths out their configurations. Our results are expected to have wide implications from the study of near-conformal dynamics stemming from QCD-like theories to phenomenological investigations of nuclear matter in extreme regimes.
Comments:
35 pages, 19 figures
Subjects:
High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Lattice (hep-lat); High Energy Physics — Theory (hep-th); Nuclear Theory (nucl-th)
arXiv:
2310.04083 [pdf]
PRD(2024)·4 citations
06
[Submitted on 6 Oct 2023] (cross-list from hep-ph)
Probing the hidden-bottom pentaquark resonances in photonuclear bottomonium production near threshold: differential observables
E. Ya. Paryev🇷🇺
We study the near-threshold $Υ (1 S)$ meson photoproduction from protons and nuclei by considering incoherent direct non-resonant ( $γ p \to Υ (1 S) p$ , $γ n \to Υ (1 S) n$ ) and two-step resonant ( $γ p \to P_{bi}^{+} \to Υ (1 S) p$ , $γ n \to P_{bi}^{0} \to Υ (1 S) n$ , $i = 1$ , 2, 3; $P_{b 1}^{+, 0} = P_{b}^{+, 0} (11080)$ , $P_{b 2}^{+, 0} = P_{b}^{+, 0} (11125)$ , $P_{b 3}^{+, 0} = P_{b}^{+, 0} (11130)$ ) bottomonium production processes with the main goal of clarifying the possibility to observe the non-strange hidden-bottom pentaquark states $P_{bi}^{+, 0}$ in this production via differential observables. We calculate the absolute excitation functions, energy and momentum distributions for the non-resonant, resonant and for the combined (non-resonant plus resonant) production of $Υ (1 S)$ mesons on protons, on carbon and tungsten target nuclei at near-threshold incident photon beam energies by assuming the spin-parity assignments of the hypothetical hidden-bottom resonances $P_{b}^{+, 0} (11080)$ , $P_{b}^{+, 0} (11125)$ and $P_{b}^{+, 0} (11130)$ as $J^{P} = (1/2)^{-}$ , $J^{P} = (1/2)^{-}$ and $J^{P} = (3/2)^{-}$ within four different realistic choices for the branching ratios of their decays to the $Υ (1 S) p$ and $Υ (1 S) n$ modes (0.125, 0.25, 0.5 and 1\%) as well as for two options for the background contribution. We demonstrate that the measurements of these combined observables on proton and nuclear targets in the near-threshold energy region in future experiments at the planned high-luminosity electron-ion colliders EIC and EicC in the US and China should provide evidence for the existence of the above hidden-bottom pentaquark resonances as well as clarify their decay rates.
Comments:
33 pages, 13 figures. arXiv admin note: text overlap with arXiv:2211.16037, arXiv:2304.03978; references and some additional comments are added
Subjects:
High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Experiment (hep-ex); Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
arXiv:
2310.04123 [pdf]
NPA(2024)·9 citations
07
[Submitted on 6 Oct 2023] (cross-list from nucl-ex)
Study of neutron multiplicity in $^{232}$ Th (n,f) reaction using TALYS-1.96
Punit Dubey · Ajay Kumar
The nuclear scientific community views $^{232}$ Th as an option for fuel in the future nuclear energy program. Numerous experimental studies have been conducted to determine the cross-section; however, very few have been performed to calculate the total neutron multiplicity above 10 MeV energy. In this work, we have compared the experimental data of average neutron multiplicity at different incident energies from EXFOR with the evaluated data from ENDF/B-VI, JENDL-4.0, and the calculated data from TALYS-1.96. The experimental data are in good agreement with the evaluated data from both the ENDF/B-VI and JENDL-4.0 libraries and at high incident energy (7 MeV), the TALYS-1.96 data are also in agreement with the experimental data.
Subjects:
Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
arXiv:
2310.04151 [pdf]
0 citations
08
[Submitted on 6 Oct 2023] (cross-list from nucl-ex)
Variation of Tensor Force due to Nuclear Medium Effect
Ziming Li🇨🇳 · Jie Zhu🇨🇳 · Taofeng Wang🇨🇳 · Minliang Liu🇨🇳 · Jiansong Wang🇨🇳 · Yanyun Yang🇨🇳 · Chengjian Lin🇨🇳 · Zhiyu Sun🇨🇳 · Qinghua He🇨🇳 · M. Assié🇫🇷 · Y. Ayyad🇺🇸 · D. Beaumel🇫🇷 and 24 other authors
The enhancement of $J^{π} (T)$ =3 $^{+}$ (0) state with isospin $T = 0$ excited by the tensor force in the free $^{6}$ Li nucleus has been observed, for the first time, relative to a shrinkable excitation in the $^{6}$ Li cluster component inside its host nucleus. Comparatively, the excitation of $J^{π} (T)$ =0 $^{+}$ (1) state with isospin $T = 1$ for these two $^{6}$ Li formations take on an approximately equal excitation strength. The mechanism of such tensor force effect was proposed due to the intensive nuclear medium role on isospin $T$ =0 state.
Comments:
6 pages, 4 figures
Subjects:
Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
arXiv:
2310.04261 [pdf]
0 citations
09
[Submitted on 6 Oct 2023] (cross-list from nucl-ex)
Aspect of Clusters Correlation at Light Nuclei Excited State
Ziming Li🇨🇳 · Jie Zhu🇨🇳 · Taofeng Wang🇨🇳 · Minliang Liu🇨🇳 · Jiansong Wang🇨🇳 · Yanyun Yang🇨🇳 · Chengjian Lin🇨🇳 · Zhiyu Sun🇨🇳 · Qinghua He🇨🇳 · M. Assié🇫🇷 · Y. Ayyad🇺🇸 · D. Beaumel🇫🇷 and 24 other authors
The correlation of $α α$ was probed via measuring the transverse momentum $p_{T}$ and width $δ p_{T}$ of one $α$ , for the first time, which represents the spatial and dynamical essentialities of the initial coupling state in $^{8}$ Be nucleus. The weighted interaction vertex of 3 $α$ reflected by the magnitudes of their relative momentums and relative emission angles proves the isosceles triangle configuration for 3 $α$ at the high excited energy analogous Hoyle states.
Comments:
8 pages, 9 figures
Subjects:
Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
arXiv:
2310.04274 [pdf]
0 citations
10
[Submitted on 6 Oct 2023] (cross-list from nucl-ex)
Multi-alpha Boson Gas state in Fusion Evaporation Reaction and Three-body Force
Taofeng Wang🇨🇳 · Ziming Li🇨🇳 · R. B. Wiringa🇺🇸 · Minliang Liu🇨🇳 · Jiansong Wang🇨🇳 · Yanyun Yang🇨🇳 · Qinghua He🇨🇳 · Zhiyu Sun🇨🇳 · Chengjian Lin🇨🇳 · M. Assié🇫🇷 · Y. Ayyad🇺🇸 · D. Beaumel🇫🇷 and 24 other authors
The experimental evidence for the $α$ Boson gas state in the $^{11}$ C+ $^{12}$ C $\to$ $^{23}$ Mg $^{*}$ fusion evaporation reaction is presented. By measuring the $α$ emission spectrum with multiplicity 2 and 3, we provide insight into the existence of a three-body force among $α$ particles. The observed spectrum exhibited distinct tails corresponding to $α$ particles emitted in pairs and triplets consistent well with the model-calculations of AV18-UX and chiral effective field theory of NV2-3-la*, indicating the formation of $α$ clusters with three-body force in the Boson gas state.
Comments:
7 pages, 6 figures
Subjects:
Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
arXiv:
2310.04282 [pdf]
0 citations

Affiliations

first authorsco-authorsvia INSPIRE