Nuclear Theory·nucl-th

Tuesday·October 18, 2022

17 papers—9 primary·8 cross-listed

01
[Submitted on 15 Oct 2022]
Intense X-ray laser-induced proton emission from halo nuclei
Binbing Wu · Jie Liu
We investigate the intense X-ray laser-induced proton emission from halo nuclei within the framework of a nonperturbative quantum $S$ -matrix approach. We have analytically deduced the angular differential as well as the total multi-photon rates of the proton emissions. For a linearly polarized X-ray laser field, we find that the angular distributions of proton emission sensitively depend on the laser frequency and show an interesting petal structure with increasing the laser frequency as well as the number of absorbed photons. Meanwhile, we find the Coulomb repulsion potential between the proton and the remainder nucleus has a strong hindering effect on the total multi-photon rates of the proton emissions and leads to the blue shifts of the multi-photon transition frequency. Moreover, the polarization effects of laser fields on total rates of proton emission have also been addressed. We find that the polarized ellipticity corresponding to the maximum of the total rates depend on the laser frequency showing a transition from perturbative to nonperturbative proton emission. The underlying mechanism of the above findings is uncovered, and some implications are discussed.
Subjects:
Nuclear Theory (nucl-th)
arXiv:
2210.08199 [pdf]
PRC(2022)·3 citations
02
[Submitted on 15 Oct 2022]
Elliptic flow in heavy-ion collisions at intermediate energy: the role of impact parameter, mean field potential, and collision term
Bo Gao🇨🇳 · Yongjia Wang🇨🇳 · Zepeng Gao🇨🇳 · Qingfeng Li🇨🇳
Within the ultrarelativistic quantum molecular dynamics (UrQMD) model, by reverse tracing nucleons that are finally emitted at mid-rapidity (| $y_{0}$ | < 0.1) in the entire reaction process, the time evolution of elliptic flow ( $v_{2}$ ) of these traced nucleons produced in Au+Au collisions at beam energy of 0.4 GeV $/$ nucleon with different impact parameters ( $b$ ) is studied. The initial value of $v_{2}$ is positive and increases with $b$ , then it decreases as time passes and tends to saturate at a negative value. It is found that nucleon-nucleon collisions always depress the value of $v_{2}$ (enhance the out-of-plane emission), while the nuclear mean field potential may slightly raise the value of $v_{2}$ during the expansion stage in peripheral reactions. The related density mostly probed by $v_{2}$ of nucleons at mid-rapidity is found to be $\sim$ 60% of the maximum density reached during the collisions.
Comments:
7 pages, 5 figures
Subjects:
Nuclear Theory (nucl-th)
arXiv:
2210.08213 [pdf]
PLB(2023)·14 citations
03
[Submitted on 16 Oct 2022]
ARIEL experiments and theory
Petr Navratil🇨🇦
I present an overview of experiments at TRIUMF ARIEL and ISAC facilities covering both the current and the future envisioned programs. I also briefly review theory program at TRIUMF that relates to the ARIEL experimental program. I highlight several recent experimental results from the nuclear astrophysics, nuclear structure, fundamental symmetries, and the sterile neutrino search. Finally, I mention ongoing theoretical ab initio calculations of the proton capture on 7Li related to the X17 boson observation.
Comments:
Contribution to proceedings of the workshop New Scientific Opportunities with the TRIUMF ARIEL e-linac, 10 pages, 5 figures
Subjects:
Nuclear Theory (nucl-th); Nuclear Experiment (nucl-ex)
arXiv:
2210.08438 [pdf]
J.Phys.Conf.Ser.(2022)·4 citations
04
[Submitted on 16 Oct 2022]
Constraints on the nuclear Schiff moment from its correlation with electromagnetic properties
K. Yanase · N. Shimizu · K. Higashiyama · N. Yoshinaga
We study the nuclear Schiff moments of $^{129}$ Xe and $^{199}$ Hg induced by the nucleon electric dipole moment using large-scale shell model calculations. For $^{129}$ Xe, we find a linear relation between the leading-order contribution and magnetic moment, which would be useful in reducing the theoretical uncertainty. The conventional model space does not contain the $0 g_{9/2}$ and $0 h_{9/2}$ orbitals, which are connected to the spin-orbit partners by large matrix elements. Thus, to evaluate the influence of the relevant single-particle orbitals outside the conventional model space, we apply the quasiparticle vacua shell model method. Moreover, the next-to-leading-order contribution arises from parity and time-reversal violation inside the nucleus. We demonstrate that these secondary effects do not induce any significant disturbance to the correlation. Additionally, we report the shell model results for the nuclear Schiff moment coefficients of $^{199}$ Hg. Compared to previous studies, the results obtained in this study are rather large, indicating a higher sensitivity to the neutron electric dipole moment.
Subjects:
Nuclear Theory (nucl-th); High Energy Physics — Experiment (hep-ex); High Energy Physics — Phenomenology (hep-ph); Nuclear Experiment (nucl-ex)
arXiv:
2210.08498 [pdf]
PLB(2023)·10 citations
05
[Submitted on 16 Oct 2022]
Multi-Neutrino Entanglement and Correlations in Dense Neutrino Systems
Marc Illa🇺🇸 · Martin J. Savage🇺🇸
The time-evolution of multi-neutrino entanglement and correlations are studied in two-flavor collective neutrino oscillations, relevant for dense neutrino environments, building upon previous works. Specifically, simulations performed of systems with up to 12 neutrinos using Quantinuum's H1-1 20 qubit trapped-ion quantum computer are used to compute n-tangles, and two- and three-body correlations, probing beyond mean-field descriptions. n-tangle re-scalings are found to converge for large system sizes, signaling the presence of genuine multi-neutrino entanglement.
Comments:
7 pages + 10 pages of Supplementary Material, 9 figures and 11 tables; modified Sec 3; Published version
Subjects:
Nuclear Theory (nucl-th); High Energy Physics — Phenomenology (hep-ph); Quantum Physics (quant-ph)
arXiv:
2210.08656 [pdf]
PRL(2023)·58 citations
06
[Submitted on 17 Oct 2022]
Application of R-matrix and Lagrange-mesh methods to nuclear transfer reactions
Shubhchintak · P. Descouvemont
Background: Nuclear transfer reactions are a useful tool to study the structure of a nucleus. For reactions involving weekly bound nuclei, breakup effects can play significant role and theoretical calculations can be computational expensive in such cases. Purpose: To utilize the Lagrange-mesh and R-matrix methods for nuclear transfer reactions. Methods: We use the adiabatic distorted wave approximation (ADWA) method which can approximately treats the breakup effects in a simpler manner. In our approach, we apply the R-matrix method combining it with the Lagrange-mesh method, which is known to provide the fast and accurate computations. Results: As a test case, we calculate the angular distribution of the cross sections for the 54Fe(d, p)55Fe reaction, where deuteron breakup effects play important role. Conclusions: We show that these methods work well in the ADWA framework, and we look forward to applying these methods in coupled channel calculations.
Comments:
Presented in the online International conference on recent trends in nuclear physics, India
Subjects:
Nuclear Theory (nucl-th); Nuclear Experiment (nucl-ex)
arXiv:
2210.08820 [pdf]
J. Nucl. Phys. Mat. Sci. Rad. A. Vol. 9, …·0 citations
07
[Submitted on 17 Oct 2022]
Ab initio single-neutron spectroscopic overlaps in lithium isotopes
G. H. Sargsyan · K. D. Launey · R. M. Shaffer · S. T. Marley · N. Dudeck · A. Mercenne · T. Dytrych · J. P. Draayer
We calculate single-neutron spectroscopic overlaps for lithium isotopes in the framework of the \textit{ab initio} symmetry-adapted no-core shell model. We report the associated neutron-nucleus asymptotic normalization coefficients (ANCs) and spectroscopic factors (SFs) that are important ingredients in many reaction cross section calculations. While spectroscopic factors have been traditionally extracted from experimental cross sections, their sensitivity on the type of reactions, energy, and the underlying models point to the need for determining SF from first-principle structure considerations. As illustrative examples, we present $^{6}$ Li+n, $^{7}$ Li+n, and $^{8}$ Li+n, and we show that the results are in a good agreement with those of other \textit{ab initio} methods, where available, including the quantum Monte Carlo approach. We compare ANCs and SFs to available experimentally deduced values, with a view toward expanding this study to heavier nuclei and to extracting inter-cluster effective interactions for input into analyses of existing and future experimental data.
Comments:
10 pages, 8 figures
Subjects:
Nuclear Theory (nucl-th); Nuclear Experiment (nucl-ex)
arXiv:
2210.08843 [pdf]
PRC(2023)·9 citations
08
[Submitted on 17 Oct 2022]
Prediction for the synthesis cross sections of new moscovium isotopes in fusion-evaporation reactions
Peng-Hui Chen · Hao Wu · Zu-Xing Yang · Xiang-Hua Zeng · Zhao-Qing Feng
In the framework of the dinuclear system model, the synthesis mechanism of the superheavy nuclides with atomic number $Z = 112, 114, 115$ in the reactions of projectiles $^{40, 48}$ Ca bombarding on targets $^{238}$ U, $^{242}$ Pu, and $^{243}$ Am at a wide incident energies (excitation energy from 0-100 MeV) have been investigated systematically. Based on the available experimental excitation functions, the dependence of calculated synthesis cross sections on collision orientations has been studied thoroughly. The TKEs of these collisions with the fixed collision orientation show its orientation dependence which can be used to predict the tendency of kinetic energy diffusion. The TKEs are dependent on incident energies which have been discussed. The method of Coulomb barrier distribution function has been applied in our calculations which could treat all of the collision orientations from the tip-tip to side-side approximately. The calculations of excitation functions of $^{48}$ Ca + $^{238}$ U, $^{48}$ Ca + $^{242}$ Pu, and $^{48}$ Ca + $^{243}$ Am have a nice agreement with the available experimental data. The isospin effect of projectiles on production cross sections of moscovium isotopes and the influence of entrance channel effect on the synthesis cross sections of superheavy nuclei have been discussed. The synthesis cross section of new moscovium isotopes $^{278 - 286}$ Mc have been predicted as large as hundreds pb, in the fusion-evaporation reactions of $^{35, 37}$ Cl + $^{248}$ Cf, $^{38, 40}$ Ar + $^{247}$ Bk, $^{39, 41}$ K + $^{247}$ Cm, $^{40, 42, 44, 46}$ Ca + $^{238}$ Am, $^{45}$ Sc + $^{242}$ Pu, and $^{46, 48, 50}$ Ti + $^{243}$ Np, $^{51}$ V + $^{238}$ U at the excitation energy interval of 0-100 MeV.
Comments:
15 pages, 8 figures, 1 table
Subjects:
Nuclear Theory (nucl-th)
arXiv:
2210.08941 [pdf]
Nucl.Sci.Tech.(2023)·15 citations
09
[Submitted on 17 Oct 2022]
Multinucleon transfer mechanism in $^{250} Cf +^{232} Th$
S. Ayik · M. Arik · O. Yilmaz · B. Yilmaz · A. S. Umar
Production cross-sections of heavy neutron-rich isotopes are calculated by employing quantal transport description in $^{250} Cf +^{232} Th$ collisions. This quantal transport description is based on the stochastic mean-field (SMF) approach, and it provides a microscopic approach beyond time-dependent Hartree-Fock (TDHF) theory to include mean-field fluctuations. De-excitation of primary fragments is determined by employing the statistical GEMINI++ code. Calculations provide predictions for production cross-sections of neutron rich transfermium isotopes without any adjustable parameters.
Comments:
15 pages, 10 figures
Subjects:
Nuclear Theory (nucl-th)
arXiv:
2210.09106 [pdf]
0 citations
10
[Submitted on 14 Oct 2022] (cross-list from hep-lat)
Prospects for $γ^{⋆} γ^{⋆} \to π π$ via lattice QCD
Raúl A. Briceño🇺🇸 · Andrew W. Jackura🇺🇸 · Arkaitz Rodas🇺🇸 · Juan V. Guerrero🇺🇸
The $γ^{⋆} γ^{⋆} \to π π$ scattering amplitude plays a key role in a wide range of phenomena, including understanding the inner structure of scalar resonances as well as constraining the hadronic contributions to the anomalous magnetic moment of the muon. In this work, we explain how the infinite-volume Minkowski amplitude can be constrained from finite-volume Euclidean correlation functions. The relationship between the finite-volume Euclidean correlation functions and the desired amplitude holds up to energies where $3 π$ states can go on shell, and is exact up to exponentially small corrections that scale like $O (e^{- m_{π} L})$ , where $L$ is the spatial extent of the cubic volume and $m_{π}$ is the pion mass. In order to implement this formalism and remove all power-law finite volume errors, it is necessary to first obtain $π π \to π π$ , $π γ^{⋆} \to π$ , $γ^{⋆} \to π π$ , and $π π γ^{⋆} \to π π$ amplitudes; all of which can be determined via lattice quantum chromodynamic calculations.
Comments:
23 pages, 9 figures
Subjects:
High Energy Physics — Lattice (hep-lat); High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
arXiv:
2210.08051 [pdf]
PRD(2023)·8 citations
11
[Submitted on 15 Oct 2022] (cross-list from astro-ph.HE)
Evolution of collisional neutrino flavor instabilities in spherically symmetric supernova models
Zewei Xiong🇩🇪 · Meng-Ru Wu🇹🇼 · Gabriel Martínez-Pinedo🇩🇪 · Tobias Fischer🇵🇱 · Manu George🇹🇼 · Chun-Yu Lin🇹🇼 · Lucas Johns🇺🇸
We implement a multi-group and discrete-ordinate neutrino transport model in spherical symmetry which allows to simulate collective neutrino oscillations by including realistic collisional rates in a self-consistent way. We utilize this innovative model, based on strategic parameter rescaling, to study a recently proposed collisional flavor instability caused by the asymmetry of emission and absorption rates between $ν_{e}$ and $ν ˉ_{e}$ for four different static backgrounds taken from different stages in a core-collapse supernova simulation. Our results confirm that collisional instabilities generally exist around the neutrinosphere during the SN accretion and post-accretion phase, as suggested by [arXiv:2104.11369]. However, the growth and transport of flavor instabilities can only be fully captured by models with global simulations as done in this work. With minimal ingredient to trigger collisional instabilities, we find that the flavor oscillations and transport mainly affect (anti)neutrinos of heavy lepton flavors around their decoupling sphere, which then leave imprints on their energy spectra in the free-streaming regime. For electron (anti)neutrinos, their properties remain nearly intact. We also explore various effects due to the decoherence from neutrino-nucleon scattering, artificially enhanced decoherence from emission and absorption, neutrino vacuum mixing, and inhomogeneous matter profile, and discuss the implication of our work.
Comments:
20 pages, 13 figures
Subjects:
High Energy Astrophysical Phenomena (astro-ph.HE); High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
arXiv:
2210.08254 [pdf]
PRD(2023)·76 citations
12
[Submitted on 15 Oct 2022] (cross-list from hep-ph)
A journey into the proton structure: Progresses and challenges
Francesco Giovanni Celiberto🇮🇹
Unraveling the inner dynamics of gluons and quarks inside nucleons is a primary target of studies at new-generation colliding machines. Finding an answer to fundamental problems of Quantum ChromoDynamics, such as the origin of nucleon mass and spin, strongly depends on our ability of reconstructing the 3D motion of partons inside the parent hadrons. We present progresses and challenges in the extraction of TMD parton densities, with particular attention to the ones describing polarization states of gluons, which still represent an largely unexplored field. Then, we highlight connections with corresponding parton densities in the high-energy limit, the so-called unintegrated gluon distributions or UGDs and, more in general, to recent developments in high-energy physics.
Comments:
10 pages, 2 figures, version published in Universe
Subjects:
High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
arXiv:
2210.08322 [pdf]
Universe(2022)·23 citations
13
[Submitted on 16 Oct 2022] (cross-list from hep-ph)
Probing gluon TMDs with reconstructed and tagged heavy flavor hadron pairs at EIC
Xin Dong🇺🇸 · Yuanjing Ji🇺🇸 · Matthew Kelsey🇺🇸 · Sooraj Radhakrishnan🇺🇸 · Ernst Sichtermann🇺🇸 · Yuxiang Zhao🇨🇳
Study of the transverse structure of the proton is one of the major physics goals of the upcoming Electron Ion Collider (EIC). The gluon transverse momentum dependent distributions (TMD) form an essential focus of this effort and are important towards understanding the angular momentum contribution to proton spin as well as QCD factorization. However, very limited experimental constraints on the gluon TMD exist currently. As the heavy quark production in lepton-nucleon DIS gets a dominant contribution from the photon-gluon-fusion process, heavy quark production makes an attractive tool to probe gluon distributions in nucleons. In this paper we present a study of heavy flavor hadron pair reconstruction at a future EIC detector with MAPS based inner tracking and vertexing subsystems to constrain gluon TMD. We utilize the excellent track pointing resolution provided by the detector to exclusively reconstruct heavy flavor hadron pairs via their hadronic decay channels and also to develop a heavy flavor hadron tagging algorithm. Statistical uncertainty projections on azimuthal asymmetries corresponding to gluon TMD at the EIC is evaluated. The heavy flavor tagging is found to substantially enhance the purity of heavy flavor hadron pair selection, and the statistical precision of the measurement compared to that from exclusive reconstruction. The correlation between the azimuthal angle of the transverse momentum of the gluon initiating the process and that of the corresponding heavy flavor hadron pair was also studied and found to be well correlated. This study opens up heavy flavor hadron pair measurements as an attractive channel to access gluon TMD at the EIC.
Comments:
9 pages, 7 figures
Subjects:
High Energy Physics — Phenomenology (hep-ph); Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th); Instrumentation and Detectors (physics.ins-det)
arXiv:
2210.08609 [pdf]
PRD(2023)·3 citations
14
[Submitted on 17 Oct 2022] (cross-list from quant-ph)
A Quantum Algorithm for the Linear Response of Nuclei
Abhishek · Nifeeya Singh · Pooja Siwach · P. Arumugam
We present a quantum algorithm to obtain the response of the atomic nucleus to a small external electromagnetic perturbation. The Hamiltonian of the system is presented by a harmonic oscillator, and the linear combination of unitaries (LCU) based method is utilized to simulate the Hamiltonian on the quantum computer. The output of the Hamiltonian simulation is utilized in calculating the dipole response with the SWAP test algorithm. The results of the response function computed using the quantum algorithm are compared with the experimental data and provide a good agreement. We show the results for $^{120}$ Sn and $^{208}$ Pb to corroborate with the experimental data in Sn and Pb region and also compare the results with those obtained using the conventional linear response theory.
Comments:
18 pages, 9 figures
Subjects:
Quantum Physics (quant-ph); Nuclear Theory (nucl-th)
arXiv:
2210.08757 [pdf]
Indian J.Phys.(2025)·3 citations
15
[Submitted on 17 Oct 2022] (cross-list from hep-ph)
Hidden bottom pentaquark in the SU(5) version of the flavor-spin model
Fl. Stancu🇧🇪
We generalize to five distinct flavors the flavor-spin hyperfine interaction introduced previously for four flavors and used in the study of $uu d c c$ pentaquark. As a particular case here we study the lowest states of the pentaquark $uu d b b$ , of either positive or negative parity, in a constituent quark model with linear confinement and the presently extended hyperfine interaction. The positive parity states have one unit of angular momentum located in the subsystem of four quarks and are described by translationally invariant states of orbital permutation symmetry $[31]_{O}$ which requires the configuration $s^{3} p$ . The negative parity states are described by the configuration $s^{4}$ of permutation symmetry $[4]_{O}$ . We show that the lowest state has the quantum numbers $J^{P}$ = $1/ 2^{+}$ or $3/ 2^{+}$ and I = $1/2$ and is located below the $Σ_{b} B$ threshold by - 132 MeV. We present a comparison between the spectra of $uu d c c$ and $uu d b b$ pentaquarks.
Comments:
21 pages, 5 tables
Subjects:
High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Experiment (hep-ex); Nuclear Theory (nucl-th)
arXiv:
2210.08853 [pdf]
Few Body Syst.(2023)·2 citations
16
[Submitted on 17 Oct 2022] (cross-list from astro-ph.HE)
Constraining the equation of state of hybrid stars using recent information from multidisciplinary physics
Swarnim Shirke🇮🇳 · Suprovo Ghosh🇮🇳 · Debarati Chatterjee🇮🇳
At the ultra-high densities existing in the core of neutron stars, it is expected that a phase transition from baryonic to deconfined quark matter may occur. Such a phase transition would affect the underlying equation of state (EoS) as well as the observable astrophysical properties of neutron stars. Comparison of EoS model predictions with astronomical data from multi-messenger signals then provides us an opportunity to probe the behaviour of dense matter. In this work, we restrict the allowed parameter space of EoS models in neutron stars for both nucleonic (relativistic mean field model) and quark matter (bag model) sectors by imposing state-of-the-art constraints from nuclear calculations, multi-messenger astrophysical data and perturbative QCD (pQCD). We systematically investigate the effect of each constraint on the parameter space of uncertainties using a cut-off filter scheme, as well as the correlations among the parameters and with neutron star astrophysical observables. Using the constraints, we obtain limits for maximum NS mass, maximum central density, as well as for NS radii and tidal deformability. Although pQCD constraints are only effective at very high densities, they significantly reduce the parameter space of the quark model. We also conclude that astrophysical data supports high values of the bag parameter B and disfavors the existence of a pure quark matter core in hybrid stars.
Comments:
16 pages, 11 figures, 2 tables
Subjects:
High Energy Astrophysical Phenomena (astro-ph.HE); Nuclear Theory (nucl-th)
arXiv:
2210.09077 [pdf]
ApJ(2023)·19 citations
17
[Submitted on 17 Oct 2022] (cross-list from hep-ph)
Collision-induced flavor instability in dense neutrino gases with energy-dependent scattering
Yu-Chia Lin🇺🇸 · Huaiyu Duan (UNM)🇺🇸
We investigate the collision-induced flavor instability in homogeneous, isotropic, dense neutrino gases in the two-flavor mixing scenario with energy-dependent scattering. We uncover a simple expression of the growth rate of this instability in terms of the flavor-decohering collision rates and the electron lepton number distribution of the neutrino. This growth rate is common to the neutrinos and antineutrinos of different energies, and is independent of the mass-splitting and vacuum mixing angle of the neutrino, the matter density, and the neutrino density, although the initial amplitude of the unstable oscillation mode can be suppressed by a large matter density. Our results suggest that neutrinos are likely to experience collision-induced flavor conversions deep inside a core-collapse supernova even when both the fast and slow collective flavor oscillations are suppressed.
Comments:
7 pages, 4 figures. Minor changes for clarification purposes
Subjects:
High Energy Physics — Phenomenology (hep-ph); High Energy Astrophysical Phenomena (astro-ph.HE); Nuclear Theory (nucl-th)
arXiv:
2210.09218 [pdf]
PRD(2023)·55 citations

Affiliations

first authorsco-authorsvia INSPIRE