Nuclear Theory·nucl-th

Thursday·November 28, 2024

15 papers—5 primary·10 cross-listed

01
[Submitted on 26 Nov 2024]
Neutron emission from the photon-induced reactions in ultraperipheral ultrarelativistic heavy-ion collisions
Pawel Jucha🇵🇱 · Mariola Klusek-Gawenda🇵🇱 · Antoni Szczurek🇵🇱 · Michal Ciemala🇵🇱 · Katarzyna Mazurek🇵🇱
The ultraperipheral collisions are the source of various interesting phenomena based on photon-induced reactions. We calculate cross sections for single and any number of n, p, $α$ , $γ$ -rays in ultraperipheral heavy-ion collision for LHC energies. We analyze the production of a given number of neutrons relevant for a recent ALICE experiment, for $s_{N N}$ = 5.02~TeV. In our approach, we include both single and multiple photon exchanges as well as the fact that not all photon energies are used in the process of equilibration of the residual nucleus. We propose a simple two-component model in which only part of photon energy $E_{γ}$ is changed into the excitation energy of the nucleus ( $E_{e x c} \neq = E_{γ}$ ) and compare its results with outcomes of HIPSE and EMPIRE codes. The role of high photon energies for small neutron multiplicities is discussed. Emission of a small number of neutrons at high photon energies seems to be crucial to understand the new ALICE data. All effects work in the desired direction, but the description of the cross section of four- and five-neutron emission cross sections from first principles is rather demanding. The estimated emission of charged particles such as protons, deuterons and $α$ is shortly discussed and confronted with very recent ALICE data, obtained with the proton Zero Degree Calorimeter.
Comments:
16 pages, 17 figures, 6 tables
Subjects:
Nuclear Theory (nucl-th); High Energy Physics — Phenomenology (hep-ph)
arXiv:
2411.17865 [pdf]
PRC(2025)·6 citations
02
[Submitted on 27 Nov 2024]
Impact of tensor forces on quasifission product yield distributions
Liang Li · Lu Guo · K. Godbey · A. S. Umar
We employ the microscopic time-dependent Hartree-Fock (TDHF) theory to study the 48Ca+249Bk and 48Ti+238U systems, taking into account the dependence on orientation for deformed nuclei and full range of impact parameters. By analyzing fragment distributions of neutron and proton numbers, we assess the influence of different isoscalar and isovector tensor coupling constants of the effective nucleon-nucleon interaction. The quasifission yield distributions of 48Ca + 249Bk collision system utilizing SLy5t and T31 parametrizations exhibit more pronounced spherical shell effects compared to those using SLy5, T44 and T62 sets. Furthermore, within each parametrization group, the distributions for SLy5t and T31 are closely aligned, as are those for SLy5, T44, and T62. Similarly, the yield distributions for the 48Ti + 238U system using SLy5t and T31 also reflect the more pronounced spherical shell effects relative to SLy5 and T62, while the charge distribution shows much better agreement with experimental results for the SLy5t and T62 parametrizations compared to SLy5 and T31. The yield distributions for the 48Ca+249Bk and 48Ti+238U systems, when compared across the SLy5, SLy5t, T31, T44, and T62 parametrizations, indicate that the influence of tensor forces on quasifission fragments is reflected in the prominence of shell effects. This influence appears to be sensitive only in specific regions within the isoscalar and isovector coupling constant parameter space. In the 48Ti + 238U system, the prominence of shell effects is manifested not only through shifts in peak positions but also through narrower yield distributions.
Comments:
Phys. Rev. C (in press), 15 pages, 11 figures
Subjects:
Nuclear Theory (nucl-th)
arXiv:
2411.18057 [pdf]
PRC(2024)·8 citations
03
[Submitted on 27 Nov 2024]
Exploring the nuclear momentum anisotropy based on intermediate-energy heavy-ion collisions
Xiao-Hua Fan · Zu-Xing Yang · Peng-Hui Chen · Zhi-Pan Li · Wei Zuo · Masaaki Kimura · Shunji Nishimura
We simulate ultra-central collisions of prolate uranium-uranium nuclei at intermediate energies using the isospin-dependent Boltzmann-Uehling-Uhlenbeck model to investigate the impact of momentum anisotropy on spatial geometric effects. By defining the quadrupole deformation parameter in momentum space $β_{p}$ , we establish an ellipsoidal Fermi surface, aligning its rotational symmetry axis with the one in coordinate space. It is found that oblate momentum density enhances elliptic flow $v_{2}$ , while prolate momentum density has the opposite effect, particularly pronounced in the outer, high transverse momentum $p_{t}$ region. Momentum anisotropy also causes differences in the initial momentum mean projection along the beam direction, with larger projections producing more pion mesons. Additionally, significant effects on mean square elliptic flow are observed in non-polarized collisions. We further examine the relationship between the $v_{2}$ - $p_{t}$ slope and $β_{p}$ , eliminating systematic errors through the two-system ratio. These findings provide important references for experimentalists in heavy-ion collisions and valuable feedback to theorists regarding nuclear structure.
Subjects:
Nuclear Theory (nucl-th)
arXiv:
2411.18079 [pdf]
PLB(2025)·0 citations
04
[Submitted on 27 Nov 2024]
High density symmetry energy: A key to the solution of the hyperon puzzle
Jun-Ting Ye🇨🇳 · Rui Wang🇮🇹 · Si-Pei Wang🇨🇳 · Lie-Wen Chen🇨🇳
The recently developed nuclear effective interaction based on the so-called N3LO Skyrme pseudopotential is extended to include the hyperon-nucleon and hyperon-hyperon interactions by assuming the similar density, momentum, and isospin dependence as for the nucleon-nucleon interaction. The parameters in these interactions are determined from either experimental information if any or chiral effective field theory or lattice QCD calculations of the hyperon potentials in nuclear matter around nuclear saturation density $ρ_{0}$ . We find that varying the high density behavior of the symmetry energy $E_{sym} (ρ)$ can significantly change the critical density for hyperon appearance in the neutron stars and thus the maximum mass $M_{TOV}$ of static hyperon stars. In particular, a symmetry energy which is soft around $2 - 3 ρ_{0}$ but stiff above about $4 ρ_{0}$ , can lead to $M_{TOV} ≳ 2 M_{⊙}$ for hyperon stars and simultaneously be compatible with (1) the constraints on the equation of state of symmetric nuclear matter at suprasaturation densities obtained from flow data in heavy-ion collisions; (2) the microscopic calculations of the equation of state for pure neutron matter; (3) the star tidal deformability extracted from gravitational wave signal GW170817; (4) the mass-radius relations of PSR J0030+0451, PSR J0740+6620 and PSR J0437-4715 measured from NICER; (5) the observation of the unusually low mass and small radius in the central compact object of HESS J1731-347. Furthermore, the sound speed squared of the hyperon star matter naturally displays a strong peak structure around baryon density of $3 - 4 ρ_{0}$ , consistent with the model-independent analysis on the multimessenger data. Our results suggest that the high density symmetry energy could be a key to the solution of the hyperon puzzle in neutron star physics.
Comments:
21 pages, 5 figures, 2 tables. Presentation improved and discussions significantly expanded, especially on the implications of a symmetry energy soft at intermediate densities but stiff at high densities. Accepted version to appear in ApJ
Subjects:
Nuclear Theory (nucl-th); High Energy Astrophysical Phenomena (astro-ph.HE); High Energy Physics — Phenomenology (hep-ph); Nuclear Experiment (nucl-ex)
arXiv:
2411.18349 [pdf]
ApJ(2025)·24 citations
05
[Submitted on 27 Nov 2024]
Iterative solutions of the ATDHFB equations to determine the nuclear collective inertia
Xuwei Sun · Jacek Dobaczewski · Markus Kortelainen · David Muir · Jhilam Sadhukhan · Adrian Sánchez-Fernández · Herlik Wibowo
An iterative adiabatic time-dependent Hartree-Fock-Bogoliubov (ATDHFB) method is developed within the framework of Skyrme density functional theory. The ATDHFB equation is solved iteratively to avoid explicitly calculating the stability matrix. The contribution of the time-odd mean fields to the ATDHF(B) moment of inertia is incorporated self-consistently, and the results are verified by comparing them with the dynamical cranking predictions. The inertia mass tensor is calculated with the density-derivative term evaluated by numerical differentiation.
Comments:
9 pages, 4 figures
Subjects:
Nuclear Theory (nucl-th)
arXiv:
2411.18404 [pdf]
Acta Phys.Polon.Supp.(2025)·1 citation
06
[Submitted on 26 Nov 2024] (cross-list from hep-ph)
Chiral effective theory of scalar and vector diquarks revisited
Yonghee Kim🇯🇵 · Makoto Oka🇯🇵 · Kei Suzuki🇯🇵
Chiral effective theory of light diquarks is revisited. We construct an effective Lagrangian based on the linear representation of three-flavor chiral symmetry. Here, we focus on the effect of a chiral and $U (1)_{A}$ symmetric term originated from an eight-point quark interaction. From this model, we obtain the mass formulas of scalar, pseudoscalar, vector, and axial-vector diquarks, which also describe the dependence of diquark masses on the spontaneous chiral symmetry breaking and the $U (1)_{A}$ anomaly. We regard singly heavy baryons as two-body systems composed of one heavy quark and one diquark and then predict the fate of the mass spectrum and the strong decay widths under chiral symmetry restoration.
Comments:
16 pages, 8 figures, 5 tables; published version
Subjects:
High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Experiment (hep-ex); Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
arXiv:
2411.17803 [pdf]
PRD(2025)·7 citations
07
[Submitted on 26 Nov 2024] (cross-list from hep-ph)
CP violation in cold dense quark matter and axion effects on the non-radial oscillations of neutron stars
Deepak Kumar🇮🇳 · Hiranmaya Mishra🇮🇳
Charge-conjugation and parity violation in strong interaction for cold dense quark matter is studied with axions of quantum chromodynamic within the three flavor Nambu--Jona-Lasinio model that includes the coupling of axions to quarks. We first calculate the effective potential for axions at finite baryon density and zero temperature including the effects of a first order chiral phase transition. Using the equation of state for quark matter with axions and a hadronic matter equation of state in the ambit of a relativistic mean field theory in quantum hadrodynamics, we discuss the hadron-quark phase transition. Inclusion of axions reduces the critical density for chiral transition. We use a Gibbs construct for the hadron-quark phase transition satisfying the constraints of beta equilibrium and charge neutrality as appropriate for the neutron star matter. The equation of state so obtained is used to investigate the structure of hybrid neutron stars. It is found that with the presence of axions, it is possible to have stable hybrid neutron stars having an inner core of quark matter both in pure quark matter phase as well as in a mixed phase with hyperonic matter along with a outer core of hyperonic matter and is in agreement with modern astrophysical constraints. We also discuss the properties of non-radial oscillations of such hybrid neutron stars. It is observed that the quadrupolar fundamental modes ( $f$ -modes) for such hybrid neutron stars get substantial enhancements both due to a larger quark core in the presence of axions and from the hyperons as compared to a canonical nucleonic neutron stars.
Comments:
25 pages, 12 figures
Subjects:
High Energy Physics — Phenomenology (hep-ph); High Energy Astrophysical Phenomena (astro-ph.HE); Nuclear Theory (nucl-th)
arXiv:
2411.17828 [pdf]
JCAP(2026)·11 citations
08
[Submitted on 26 Nov 2024] (cross-list from astro-ph.SR)
"Nuclear thermometers" reveal the origin of the universal r-process nucleosynthesis
José Nicolás Orce
The resembling behaviour of giant dipole resonances built on ground and excited states supports the validity of the Brink-Axel hypothesis and assigns giant dipole resonances as spectroscopic probes -- or ``nuclear thermometers'' -- to explore the cooling of the kilonova ejecta in neutron-star mergers down to the production of heavy elements beyond iron through the rapid-neutron capture or r-process. In previous work, we found a slight energy increase in the giant dipole resonance built on excited states at the typical temperatures of $1.0 ⪆ T ⪆ 0.7$ MeV where seed nuclei are produced, before ongoing neutron capture. Crucial data are presented here supporting an enhanced symmetry energy at $T = 0.51$ MeV (or $5.9 \times 1 0^{9}$ K) -- where the r-process occurs -- that lowers the binding energy in the Bethe-Weizsäcker semi-empirical mass formula and results in the close in of the neutron drip line. Ergo, providing an origin to the universality of elemental abundances by limiting the reaction network for r-process nucleosynthesis. An enhanced symmetry energy away from the ground state is further supported by shell-model calculations of the nuclear electric dipole ({\sc E1}) polarizability -- inversely proportional to the symmetry energy -- as a result of the destructive contribution of the products of off-diagonal {\sc E1} matrix elements.
Comments:
5 pages, 5 figures
Subjects:
Solar and Stellar Astrophysics (astro-ph.SR); Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
arXiv:
2411.17852 [pdf]
0 citations
09
[Submitted on 27 Nov 2024] (cross-list from hep-ph)
Fully charmed P-wave tetraquark resonant states in the quark model
Wei-Lin Wu🇨🇳 · Shi-Lin Zhu🇨🇳
We conduct the first comprehensive P-wave four-body dynamical calculations of the fully charmed tetraquark systems within the quark potential model. We apply the Gaussian expansion method to solve the four-body Schrödinger equation, incorporating both dimeson and diquark-antidiquark spatial configurations. The matrix elements of P-wave states are calculated analytically using the infinitesimally-shifted Gaussian basis functions. With the complex scaling method, we obtain several fully charmed P-wave resonant states with compact tetraquark configuration in the mass region of $(7.0, 7.2)$ GeV, including states with exotic quantum numbers $J^{P C} = 0^{--}, 1^{-+}$ . However, we find no resonant states with the mass $M < 7$ GeV and width $Γ < 200$ MeV. Combining the present investigation with our previous results on S-wave fully charmed tetraquark systems, we find no candidates for the experimental states $X (6400)$ and $X (6600)$ in the quark model.
Comments:
version accepted by PRD
Subjects:
High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Experiment (hep-ex); High Energy Physics — Lattice (hep-lat); Nuclear Theory (nucl-th)
arXiv:
2411.17962 [pdf]
PRD(2025)·11 citations
10
[Submitted on 27 Nov 2024] (cross-list from hep-ph)
The Equation of State and Multiparticle Production
R. N. Rogalyov🇷🇺
We discuss the distribution of fireballs produced in heavy-ion collisions in the net-baryon number and argue that neither the Free-Quark Model (FQM) nor the Hadron Resonance Gas (HRG) model can provide a comprehensive explanation of the distribution observed at the LHC. The concept of net-baryon number freezeout temperature is suggested and the role of sea quarks as a possible source of net-baryon number fluctuations is emphasized.
Comments:
10 pages. Talk given at the the XXXV International Workshop on High Energy Physics "From Quarks to Galaxies: Elucidating Dark Sides", Protvino, 2023; published in Phys.Part.Nucl., 2024
Subjects:
High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
arXiv:
2411.18190 [pdf]
Phys.Part.Nucl.(2024)·0 citations
11
[Submitted on 27 Nov 2024] (cross-list from hep-ph)
On the possible existence of a $S = - 3, I = 1$ pentaquark
Albert Feijoo🇩🇪 · Isaac Vidaña🇮🇹
We analyze the possible existence of a strangeness $S = - 3$ , isospin $I = 1$ pentaquark state $P_{sss}$ generated dynamically from the $K ˉ Ξ$ interaction. We employ a unitarized scheme in coupled channels based on the chiral Lagrangian expanded up to next-to-leading order (NLO), and show that the inclusion of the NLO terms is crucial to provide the necessary attraction that favors the existence of such triply strange pentaquark. The $K ˉ Ξ$ femtoscopic correlation functions are calculated as example of a possible experimental measurement in which a direct signal of the $P_{sss}$ state could be observed.
Comments:
7 pages, 4 figures
Subjects:
High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Theory (hep-th); Nuclear Theory (nucl-th)
arXiv:
2411.18248 [pdf]
EPJA(2025)·6 citations
12
[Submitted on 27 Nov 2024] (cross-list from hep-ph)
Production of exotic hadrons in $pp$ and nuclear collisions
Jinhui Chen · Feng-Kun Guo · Yu-Gang Ma · Cheng-Ping Shen · Qiye Shou · Qian Wang · Jia-Jun Wu · Bing-Song Zou
Exotic hadrons beyond the conventional quark model have been discovered in the past two decades. Investigations of these states can lead to deep understanding of nonperturbative dynamics of the strong interaction. In this concise review, we focus on the productions of exotic hadrons in $pp$ , $p p ˉ$ , and nuclear collisions. Experimental observations of light nuclei and hypernuclei, as prototypes of hadronic molecules, in heavy ion collisions will also be briefly discussed.
Comments:
17 pages, 16 figures. This review is dedicated to Professor Wenqing Shen on the occasion to celebrate his 80th birthday. All authors contributed equally to this work
Subjects:
High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Experiment (hep-ex); Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
arXiv:
2411.18257 [pdf]
Nucl.Sci.Tech.(2025)·47 citations
13
[Submitted on 27 Nov 2024] (cross-list from nucl-ex)
On formation of the $^{12}$ C(0 $_{2}^{+}$ ) and $^{12}$ C(3 $^{-}$ ) states in relativistic dissociation of light nuclei
A.A. Zaitsev · P.I. Zarubin
The formation of the excited states $^{12}$ C(0 $_{2}^{+}$ ) and $^{12}$ C(3 $^{-}$ ) is investigated in the dissociation of $^{12}$ C $\to$ 3 $α$ and $^{16}$ O $\to$ 4 $α$ at the energy of 3.65 GeV per nucleon in the nuclear emulsion. The identification becomes possible by reconstructing the invariant mass from measurements of emission angles in the approximation of conservation of momentum per nucleon of the parent nucleus. The contribution of the decays $^{12}$ C(0 $_{2}^{+}$ ) and $^{12}$ C(3 $^{-}$ ) to the dissociation $^{12}$ C $\to$ 3 $α$ is 11 and 19%, and in $^{16}$ O $\to$ 4 $α$ it is - 20 and 30%, correspondingly.
Comments:
The article to be published in Physics of atomic Nuclei as proceedings of The 7th International Conference on Particle Physics and Astrophysics (ICPPA-2024) (https://indico.particle.mephi.ru/event/436/contributions/4186/)
Subjects:
Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
arXiv:
2411.18394 [pdf]
Phys.Atom.Nucl.(2025)·0 citations
14
[Submitted on 27 Nov 2024] (cross-list from hep-ph)
Collectivity in ultra-peripheral heavy-ion and e+A collisions
Björn Schenke · Chun Shen · Wenbin Zhao
We review recent theoretical progress in describing collective effects in photon+nucleus collisions. The approaches considered range from the color glass condensate where correlations are encoded in the initial state, to hydrodynamic frameworks, where a strong final state response to the initial geometry of the collision is the key ingredient to generate momentum-space correlations.
Comments:
8 pages, 1 figure, presented at "Diffraction and Low- $x$ 2024'', Trabia (Palermo, Italy), September 8-14, 2024
Subjects:
High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
arXiv:
2411.18407 [pdf]
Acta Phys.Polon.Supp.(2025)·3 citations
15
[Submitted on 20 Nov 2024] (cross-list from astro-ph.SR)
Re examination of \b{eta} decay in Hg, Pb and Po Isotopes
Jameel-Un Nabi · Tuncay Bayram · Muhammad Riaz · Asim Ullah · Anes Hayder · Sevki Senturk · Mahmut Boyukata
This study re examines the effect of nuclear deformation on the calculated Gamow Teller (GT) strength distributions of neutron deficient (178 192Hg, 185 194Pb and 196 206Po) nuclei. The nuclear ground state properties and shape parameters were calculated using the Relativistic Mean Field model. Three different density dependent interactions were used in the calculation. Estimated shape parameters were later used within the framework of deformed proton-neutron quasi random phase approximations model, with a separable interaction, to calculate the GT strength distributions, half lives and branching ratios for these neutron deficient isotopes. It was concluded that half lives and GT strength distributions vary considerably with change in shape parameter.
Comments:
20 Paeges, 11Figures and 4 Tables
Subjects:
Solar and Stellar Astrophysics (astro-ph.SR); Nuclear Theory (nucl-th)
arXiv:
2411.18411 [pdf]
Phys.Scripta(2023)·0 citations

Affiliations

first authorsco-authorsvia INSPIRE