Nuclear Theory·nucl-th

Friday·December 8, 2023

12 papers—5 primary·7 cross-listed

01
[Submitted on 6 Dec 2023]
Excitation of multipolar transitions in nuclei by twisted photons
P.O. Kazinski · A.A. Sokolov
The explicit expression for the probability of absorption of a twisted photon by an atomic nucleus has been obtained. It is shown that photoabsorption obeys the selection rule $j ⩾ ∣ m_{γ} ∣$ , where $j$ is the multipolarity of the nuclear transition, when the nuclei lie near the axis along which a twisted photon with a projection of the total angular momentum $m_{γ}$ propagates. In the long-wave limit, the main contribution to the probability of absorption of a twisted photon comes from the multipole transition with $j = ∣ m_{γ} ∣$ . The absorption coefficient for twisted photons in a target consisting of many nuclei has been found.
Comments:
15 pp; some misprints corrected
Subjects:
Nuclear Theory (nucl-th)
arXiv:
2312.03803 [pdf]
Phys.Atom.Nucl.(2024)·10 citations
02
[Submitted on 6 Dec 2023]
On the Destabilization of High-Mass Neutron Stars by the Emergence of $d^{*}$ -Hexaquarks
Marcos O. Celi🇦🇷 · Mikhail Bashkanov🇬🇧 · Mauro Mariani🇦🇷 · Milva G. Orsaria🇦🇷 · Alessandro Pastore🇫🇷 · Ignacio F. Ranea-Sandoval🇦🇷 · Fridolin Weber🇺🇸
We study the effects of the first nontrivial hexaquark, $d^{*}$ (2380), on the equation of state of dense neutron star matter and investigate the consequences of its existence for neutron stars. The matter in the core regions of neutron stars is described using density-dependent relativistic mean-field theory. Our results show that within the parameter spaces examined in our paper, (i) the critical density at which the $d^{*}$ condensate emerges lies between 4 and 5 times the nuclear saturation density, (ii) $d^{*}$ hexaquarks are found to exist only in rather massive neutron stars, (iii) only relatively small fractions of the matter in the core of a massive neutron star may contain hexaquarks.
Comments:
15 pages, 7 figures. Accepted for publication in Physical Review D
Subjects:
Nuclear Theory (nucl-th); High Energy Astrophysical Phenomena (astro-ph.HE); Solar and Stellar Astrophysics (astro-ph.SR)
arXiv:
2312.03880 [pdf]
PRD(2024)·12 citations
03
[Submitted on 7 Dec 2023]
Global density-dependent $α$ -nucleon interaction for $α$ -nucleus elastic scattering
T. Furumoto · K. Tsubakihara · S. Ebata · W. Horiuchi
We provide a global density-dependent $^{4}$ He-nucleon (DD- $α N$ ) interaction to construct the $α$ -nucleus optical model potential (OMP) in a wide range of incident energies. The global parametrization for the DD- $α N$ interaction is obtained based on the proton- $^{4}$ He OMP which reproduces the elastic scattering cross-section data very well in the incident energies of 12.04--500 MeV per nucleon. We derive the $α$ -nucleus potential by a folding procedure with the point-nucleon density obtained by a microscopic mean-field model using the present DD- $α N$ interaction. The density dependence of the DD- $α N$ interaction is fixed phenomenologically to reproduce the $α$ -nucleus elastic scattering cross-section data by the $^{16}$ O, $^{40}$ Ca, $^{58}$ Ni, $^{90}$ Zr, and $^{208}$ Pb targets at $E / A =$ 10--342.5 MeV. We also show the total reaction cross sections, which are helpful in fixing one free parameter, the renormalization factor for the imaginary part of the $α$ -nucleus potential. Lastly, we show some examples, which clearly demonstrate the validity and power of the present DD- $α N$ approach.
Comments:
20 pages, 11 figures
Subjects:
Nuclear Theory (nucl-th); Nuclear Experiment (nucl-ex)
arXiv:
2312.03960 [pdf]
PTEP(2024)·2 citations
04
[Submitted on 7 Dec 2023]
The charge density and neutron skin thickness of Skyrmions
Alberto García Martín-Caro🇪🇸 · Chris Halcrow🇸🇪
Motivated by recent parity violating electron scattering experiments, we compute the Neutron Skin Thickness (NST) of nuclei modelled as (quantized) Skyrmions, the topological solitons of the Skyrme model. We show how in a certain approximation, the result for the NST is oblivious to the fine details of the (generally very complicated) quantum state of the soliton and only depends on the total baryon number and the isospin number. Moreover, in the leading order, the linear dependence on the asymmetry parameter is recovered, as expected both from experimental data and other models of nuclei such as the liquid drop model.
Comments:
14 pages, 7 figures
Subjects:
Nuclear Theory (nucl-th); High Energy Physics — Theory (hep-th)
arXiv:
2312.04335 [pdf]
4 citations
05
[Submitted on 6 Dec 2023]
Multimodality of $^{187}$ Ir fission studied by Langevin approach
Y.G. Huang · F.C. Gu · Y.J. Feng · H. Wang · E.X. Xiao · X. Lei · L. Zhu · J. Su
[Background] The fission mechanism of sub-lead nuclides remains unclear, especially the types of fission modes involved and their corresponding shell effects. [Purpose] The aim is to identify the different modes in the fission of $^{187}$ Ir, and investigate the corresponding mechanism. [Method] The three-dimensional Langevin approach considering nucleus elongation, deformation, and mass asymmetry is applied to simulate fission dynamics. The macro-microscopic models are used to calculate the transport coefficients. [Results] The fragment mass, deformation, and total kinetic energy (TKE) of $^{187}$ Ir fission at different excitation energies are calculated. Based on the mass-TKE correlations, four fission modes are identified, namely two asymmetric standard modes, a symmetric super-long mode, and a symmetric liquid-drop mode. Strong excitation-energy resistance of two asymmetric modes is found. The mass distributions show the dominance of single-peak shape, which is in good agreement with experimental data. The fission potential energy surface and the fission dynamics are analyzed to investigate the origins of the modes and the competition between neutron and proton shell effects. [Conclusions] Multiple fission modes are included in the $^{187}$ Ir fission behind the single-peak-like distribution of observables. The proton and neutron magic numbers with different asymmetry parameter might heighten the sensitivity to the uncertainties of shell corrections.
Comments:
18 pages, 9 figures
Subjects:
Nuclear Theory (nucl-th)
arXiv:
2312.04568 [pdf]
PRC(2024)·4 citations
06
[Submitted on 7 Dec 2023] (cross-list from hep-ph)
Spin-flip gluon GTMD $F_{1, 2}$ at small- $x$
Sanskriti Agrawal🇮🇳 · Nahid Vasim🇮🇳 · Raktim Abir🇮🇳
Until recently the spin-flip processes in the deep inelastic scatterings are thought to be suppressed in the high energy. We found a positive intercept for the spin-flip generalized transverse momentum-dependent parton distribution (GTMDs) $Re (F_{1, 2})$ as, \begin{eqnarray} {\rm Re}(F_{1,2}) \sim \left(\frac{1}{x}\right)^{{\bar \alpha}_s\left(4\ln2-8/3\right)} \left(\cos 3\phi_{k\Delta} +\cos \phi_{k\Delta}\right). \nonumber \end{eqnarray} This is done by analytically solving the integro-differential evolution equation for $Re (F_{1, 2})$ , recently proposed by Hatta and Zhou, in the dilute regime. Interestingly, the surviving solution corresponds to conformal spin $n = 2$ and carries an explicit $cos 3 ϕ_{k Δ} + cos ϕ_{k Δ}$ azimuthal dependence. As the imaginary part of $F_{1, 2}$ , is related to the spin-dependent odderon or gluon Siver function and scales as $Im (F_{1, 2}) \sim x^{0}$ , the positive intercept for $Re (F_{1, 2})$ , implies that it is expected to dominate over the gluon Siver function in the small- $x$ limit - and may directly impact the modeling of unpolarised GTMDs and associated spin-flip processes.
Subjects:
High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Lattice (hep-lat); Nuclear Theory (nucl-th)
arXiv:
2312.04132 [pdf]
PRD(2024)·9 citations
07
[Submitted on 7 Dec 2023] (cross-list from hep-ph)
Energy dependent nuclear suppression from gluon saturation in exclusive vector meson production
Heikki Mäntysaari🇫🇮 · Farid Salazar🇺🇸 · Björn Schenke🇺🇸
We calculate the exclusive $J / ψ$ photoproduction cross section at high energies from the Color Glass Condensate approach. The results are compared to the center-of-mass energy dependent $γ + A \to J / ψ + A$ cross sections extracted from measurements in ultra peripheral heavy ion collisions at RHIC and LHC. We predict strong saturation-driven nuclear suppression at high energies, while LHC data prefers even stronger suppression. We explore the effect of nucleon shape fluctuations on the nuclear suppression in the coherent and incoherent cross sections, and show that the most recent measurement of the $∣ t ∣$ -differential incoherent $J / ψ$ cross section prefers large event-by-event fluctuations of the nucleon substructure in heavy nuclei, comparable to that found for a free proton.
Comments:
9 pages, 5 figures. v2 published in PRD
Subjects:
High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
arXiv:
2312.04194 [pdf]
PRD(2024)·39 citations
08
[Submitted on 7 Dec 2023] (cross-list from nucl-ex)
Photonuclear reactions on the stable isotopes of selenium at bremsstrahlung end-point energies of 10-23 MeV
F.A. Rasulova · N.V. Aksenov · S.I. Alekseev · R.A. Aliev · S.S. Belyshev · I. Chuprakov · N.Yu. Fursova · A.S. Madumarov · J.H. Khushvaktov · A.A. Kuznetsov · B.S. Yuldashev
The experiments were performed at bremsstrahlung end-point energies of 10-23 MeV with the beam from the MT-25 microtron with the use of the {\gamma}-activation technique. The experimental values of relative yields were compared with theoretical results obtained on the basis of TALYS with the standard parameters and the combined model of photonucleon reactions. Including isospin splitting in the combined model of photonucleon reactions allows to describe experimental data on reactions with proton escape in energies range from 10 to 23 MeV. Therefore, taking into account isospin splitting is necessary for a correct description of the decay of the GDR.
Comments:
22 pages, 8 figures
Subjects:
Nuclear Experiment (nucl-ex); Instrumentation and Methods for Astrophysics (astro-ph.IM); Nuclear Theory (nucl-th)
arXiv:
2312.04213 [pdf]
PRC(2025)·2 citations
09
[Submitted on 7 Dec 2023] (cross-list from astro-ph.HE)
Pulse profile variability associated with the glitch of PSR J1048 $-$ 5832
P. Liu · J.-P. Yuan · M.-Y. Ge · W.-T. Ye · S.-Q. Zhou · S.-J. Dang · Z.-R. Zhou · E. Gügercinoğlu · W.-H. Wang · P. Wang · A. Li · D. Li · N. Wang
PSR J1048 $-$ 5832 (B1046 $-$ 58) is a Vela-like pulsar that has exhibited multiple glitch events. In this study, we analyze the timing data spanning nearly 16 years, acquired from both the Fermi Gamma-ray Space Telescope and the Parkes 64 m radio telescope. As a result, a total of five glitches are detected within this dataset. Among them, a previously unknown small glitch is newly found at MJD 56985(9) (November 24, 2014), making it the smallest glitch recorded from this source so far. The increments of the spin frequency and its first derivative are $Δ ν \approx 2.2 (3) \times 1 0^{- 8}$ Hz, and $Δ ν ˙ \approx 3 (2) \times 1 0^{- 15}$ s $^{- 2}$ , respectively. Significant changes in the integrated normalized mean pulse profile are detected following three of the five glitch events, notably in the radio band. Although no evidence of a correlation is found between the spin-down rate and profile evolution, the jump phenomenon of $W_{55}$ (pulse width at the 55% peak amplitude) after the glitch in the narrow mode suggests that the glitch may influence the profile change. We discuss the influence of glitches on the pulsar's emission properties in terms of platelet motion by a crustquake and also put constraints on the equation of state from the moment of inertia and response timescales of involved superfluid layers inside the neutron star.
Comments:
14 pages, 7 figures, 6 tables, MNRAS (2024) accepted
Subjects:
High Energy Astrophysical Phenomena (astro-ph.HE); Nuclear Theory (nucl-th)
arXiv:
2312.04305 [pdf]
MNRAS(2024)·14 citations
10
[Submitted on 7 Dec 2023] (cross-list from hep-ph)
Revisiting inclusive production of J/psi and Upsilon in high-energy gamma-gamma collisions
Yelyzaveta Yedelkina🇫🇷 · Jean-Philippe Lansberg🇫🇷 · Maxim Nefedov🇫🇷
The impact of Next-to-Leading Order (NLO) QCD corrections to the differential distributions of J/psi and Upsilon mesons produced inclusively in gamma-gamma collisions is discussed for the kinematical conditions of LEP II for DELPHI and at the future Circular Electron-Positron Collider (CEPC). We take into account all sizeable contributions at LO in v^2 in NRQCD factorisation: 1) pure QED process gamma + gamma -> J/psi(3S^1_1) + \gamma up to alpha^3 alpha_s, 2) single-resolved-photon contributions up to alpha_s^4, 3) gamma+gamma -> J/psi + c c-bar up to alpha^2 alpha_s and 4) gamma+gamma -> J/psi + ggg up to alpha^2 alpha_s^3. We will also discuss the pure QED process as a contribution to the exclusive production in ultra-peripheral heavy-ion collisions (UPC) at the LHC.
Comments:
LaTeX, 6 pages, 16 figures, uses pos.sty. Talk given by Y. Yedelkina at "The European Physical Society Conference on High Energy Physics (EPS-HEP2023)", 21-25 August 2023, Hamburg, Germany; submitted to PoS - Proceedings of Science
Subjects:
High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Experiment (hep-ex); Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
arXiv:
2312.04389 [pdf]
PoS(2024)·2 citations
11
[Submitted on 7 Dec 2023] (cross-list from hep-ph)
Investigation of the analog of the $P_{c}$ states-the doubly charmed molecular pentaquarks
Xuejie Liu🇨🇳 · Yue Tan🇨🇳 · Xiaoyun Chen🇨🇳 · Dianyong Chen🇨🇳 · Hongxia Huang🇨🇳 · Jialun Ping🇨🇳
Motivated by the LHCb Collaboration's observation of a doubly charmed tetraquark state $T_{cc} (3875)$ , we systematically investigate the existence of doubly charmed pentaquark states using the resonating group method based on the QDCSM framework. The effective potential of the two involved hadrons and the bound state dynamics are included in the present work. Moreover, we have also calculated the scattering phase shifts of open channels by channel coupling to look for possible resonance states. Our estimations indicate that there is a bound state in $I (J^{P}) = \frac{3}{2} (\frac{5}{2}^{-})$ , with a mass of $4461.7$ MeV. Additionally, five resonance states can be obtained by coupling the open channel, which are $Ξ_{cc} ρ$ and $Σ_{c} D^{*}$ with $I (J^{P}) = \frac{1}{2} (\frac{1}{2}^{-})$ , $Λ_{c} D^{*}$ and $Σ_{c} D^{*}$ with $I (J^{P}) = \frac{1}{2} (\frac{3}{2}^{-})$ and $Σ_{c} D^{*}$ with $I (J^{P}) = \frac{3}{2} (\frac{1}{2}^{-})$ respectively. The existence of these predicted doubly charmed pentaquark states needs to be supported by experimental measurements and discoveries. We hope that some experiments can find evidence of these states.
Comments:
arXiv admin note: text overlap with arXiv:2211.09433
Subjects:
High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
arXiv:
2312.04390 [pdf]
PRC(2026)·14 citations
12
[Submitted on 7 Dec 2023] (cross-list from hep-ph)
Incoherent diffractive dijet production and gluon Bose enhancement in the nuclear wave function
Tiyasa Kar🇺🇸 · Alexander Kovner🇺🇸 · Ming Li🇺🇸 · Vladimir V. Skokov🇺🇸
We investigate the effect of gluon Bose enhancement in the nuclear wave function on the dijet production in incoherent diffractive processes in DIS and ultraperipheral collisions. We demonstrate that Bose enhancement leads to an enhancement of diffractive dijet production cross section when the transverse momenta of the two jets are aligned at zero relative angle. This enhancement is maximal when the magnitude of the transverse momenta of the two jets are equal, and disappears rather quickly as a function of the ratio of the two momenta. We study both the dilute limit and fully nonlinear dense regime where the nuclear wave function is evolved with the leading order JIMWLK equation. In both cases we observe a visible effect, with it being enhanced by the evolution due to the dynamical generation of the color neutralization scale.
Comments:
15 pages, 4 figures
Subjects:
High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
arXiv:
2312.04493 [pdf]
JHEP(2024)·6 citations

Affiliations

first authorsco-authorsvia INSPIRE