Nuclear Theory·nucl-th

Thursday·September 12, 2024

12 papers—5 primary·7 cross-listed

06
[Submitted on 10 Sept 2024] (cross-list from hep-ph)
Baryon stopping and charge deposition in heavy-ion collisions due to gluon saturation
Oscar Garcia-Montero🇩🇪 · Sören Schlichting🇩🇪
We compute baryon and electric charge deposition in high-energy heavy-ion collisions using the Color Glass Condensate (CGC) Effective Field Theory, where at leading order charge is deposited through multiple scatterings of valence quarks with a saturated gluon target. A simplified phenomenological formula is derived to describe charge deposition, from which the parametrical dependence with collisional energy and geometry can be extracted. We present an approximate analytical prediction of the so-called baryon stopping parameter $α_{B}$ , which shows excellent agreement with the state-of-the art extractions of $α_{B}$ from experimental data. These results are further validated using the McDIPPER framework, by computing charge deposition at midrapidity across a range of collision energies ( $s_{NN} = 62.4 - 5020$ GeV).
Subjects:
High Energy Physics — Phenomenology (hep-ph); Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
arXiv:
2409.06788 [pdf]
PRC(2025)·9 citations
07
[Submitted on 10 Sept 2024] (cross-list from hep-ph)
Unified and optimal frame choice for generalized parton distributions
Jian-Wei Qiu🇺🇸 · Nobuo Sato🇺🇸 · Zhite Yu🇺🇸
Reconstructing the internal three-dimensional quark and gluon structures of hadrons through generalized parton distributions (GPDs) from hard exclusive scattering processes is one of the most challenging tasks in nuclear and particle physics. In this paper, we introduce a new optimized reference frame that, for the first time, enables a unified view of all the reactions sensitive to GPDs and facilitates the interpretation of a variety of phase-space patterns that were previously hardly accessible and interpretable. Similarly to how the heliocentric description advanced our understanding of the solar system and gravitation, our new frame centers around a quasireal state, allows for a consistent separation of physical scales, and reveals a novel quantum interference mechanism.
Comments:
5 pages, 3 figures, plus a 3-page supplemental material
Subjects:
High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Experiment (hep-ex); High Energy Physics — Lattice (hep-lat); Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
arXiv:
2409.06882 [pdf]
PRD(2025)·5 citations
08
[Submitted on 11 Sept 2024] (cross-list from astro-ph.HE)
Investigations on the equation of state of neutron star matter with density-dependent relativistic mean-field model
Kaixuan Huang🇨🇳 · Jinniu Hu🇨🇳
The compact object with a mass of $2.50 - 2.67 M_{⊙}$ observed by LIGO Scientific and Virgo collaborations in GW190814, as well as the recent report of a light compact object with a mass and radius of $M = 0.7 7_{- 0.17}^{+ 0.20} M_{⊙}$ and $R = 10. 4_{- 0.78}^{+ 0.86}$ km within the supernova remnant HESS J1731-347, have posed a great challenge to the investigations into the supranuclear matter. In the inner core region of the neutron star, the strangeness degrees of freedom, such as the hyperons, can be present, which is also named as a hyperonic star. In this work, the neutron star consisting of nucleons and leptons, and the hyperonic star including the hyperons will be studied in the framework of the density-dependent relativistic mean-field (DDRMF) model. Some popular DDRMF parameterizations will be adopted to investigate the properties of nuclear matter and the mass, radius, tidal deformability, and other properties of neutron star and hyperonic stars. We find that the maximum masses of neutron star calculated by DD-MEX, DD-MEX1, DD-MEX2, DD-MEXY and DD-LZ1 sets can be around $2.5 - 2.6 M_{⊙}$ with quite stiff equations of state (EOSs) generated by their strong repulsive contributions from vector potentials at high densities. Moreover, by investigating the influence of the crust EOS and core EOS on the neutron stars, we find that the observational data from HESS J1731-347 suggest the requirement of a crust EOS with a higher $L$ parameter and a core EOS with a lower $L$ parameter, and the $M - R$ relations from the constructed EOSs can also be consistent with the observables of PSR J0740+6620, PSR J0030+0451 from NICER and the GW170817 event. With the inclusion of hyperons, the hyperonic star matter becomes softer compared to the neutron star matter. But the massive hyperonic star can also be obtained with DDRMF parameter sets if the vector coupling constants are strong.
Comments:
arXiv admin note: substantial text overlap with arXiv:2203.12357; text overlap with arXiv:2008.04491
Subjects:
High Energy Astrophysical Phenomena (astro-ph.HE); Nuclear Theory (nucl-th)
arXiv:
2409.07038 [pdf]
Nucl.Phys.Rev.(2024)·3 citations
09
[Submitted on 11 Sept 2024] (cross-list from physics.med-ph)
Unraveling the Effects of Cluster Transfer-Induced Breakups on $^{12}$ C Fragmentation in Hadron Therapy
Arunima Dev T V · Anagha P. K · Midhun C.V · M.M Musthafa · Vafiya Thaslim T.T · Shaima Akbar · Swapna B · Nicemon Thomas · Antony Joseph · S. Ganesan
The capability of standard Geant4 PhysicsLists to address the fragmentation of $^{12}$ C $-^{12}$ C was assessed through a comparative analysis with experimental cross sections reported by Divay et al. and Dudouet et al. The standard PhysicsLists were found to be inadequate in explaining the fragmentation systematics. To address this limitation, the breakup component of fragmentation was systematically integrated into the standard PhysicsList, which successfully replicated the differential and double differential cross sections for $α$ production. This breakup component was modeled using fresco CDCC-CRC calculations. This novel physics process was then incorporated into the Geant4 framework, facilitating the calculation of dose distributions in water and tissue. The application of this method demonstrated a precise reproduction of the dose deposited at the Bragg peak region, corroborating the experimental data from Liedner et al., thereby enhancing the accurate visibility of dose tailing.
Subjects:
physics.med-ph (physics.med-ph); Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
arXiv:
2409.07090 [pdf]
J.Subatomic Part.Cosmol.(2026)·2 citations
10
[Submitted on 11 Sept 2024] (cross-list from hep-ph)
Anisotropic linear waves and breakdown of the momentum expansion in spin magnetohydrodynamics
Zhe Fang🇨🇳 · Koichi Hattori🇨🇳 · Jin Hu🇨🇳
We formulate spin magnetohydrodynamics (MHD) by including the magnetic-flux and total angular momentum conservation laws in the hydrodynamic framework. To specify the local angular momentum conservation, we choose the totally antisymmetric spin current. The entropy-current analysis allows for ten dissipative first-order transport coefficients including anisotropic spin relaxation rates and the conversion rate between a vorticity (shear) to a symmetric stress (antisymmetric torque), as well as anisotropic viscosities and resistivities. By employing the linear-mode analysis, we solve the first-order spin MHD equations to determine the dispersion relations with the complete information of anisotropy retained. Our analytic solutions indicate that the small-momentum expansion is spoiled by blow up of the higher-order terms when the angle between the momentum and the magnetic field approaches the right angle. This also reveals the existence of another expansion parameter, and, in light of it, we provide solutions in an alternative series expression beyond the critical angle. We confirm that these two series expansions work well in the appropriate angle ranges as compared with numerical results. Building on our findings regarding the breakdown of the small-momentum expansion in first-order theory, we proceed to discussing how these first-order solutions are modified when we include the relaxation dynamics for dissipative modes with the Israel-Stewart framework. We find that, due to the presence of the critical behavior in the first-order solutions, there remains a diffusive window even after the relaxation dynamics is introduced.
Comments:
18 pages, 4 figures. Analyses of IS extension added in Sec.IV.D
Subjects:
High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
arXiv:
2409.07096 [pdf]
PRD(2025)·12 citations
11
[Submitted on 11 Sept 2024] (cross-list from hep-ph)
Phenomenological model for the $γ^{*} γ \to η π^{+} π^{-}$ reaction in the $f_{1} (1285)$ energy region
Xiu-Lei Ren🇩🇪 · Igor Danilkin🇩🇪 · Marc Vanderhaeghen🇩🇪
Motivated by the ongoing analysis by the BESIII Collaboration on the single-tagged $e^{+} e^{-} \to e^{+} e^{-} η π^{+} π^{-}$ reaction, we present a phenomenological study of the diphoton fusion to $η π^{+} π^{-}$ , focusing on the production mechanism of the $f_{1} (1285)$ resonance. Contributions from the $f_{1} (1285) \to a_{0} (980)^{\pm} π^{\mp}$ and $f_{1} (1285) \to σ / f_{0} (500) η$ channels are included without introducing free parameters within an effective Lagrangian approach. Assuming the destructive interference between the amplitudes, we predict the invariant mass distributions, angular distributions, and total cross sections of the $γ^{*} γ \to η π^{+} π^{-}$ process, which will be tested by the forthcoming BESIII measurements.
Comments:
10 pages, 6 figures, 1 table, version to appear in Phys. Rev. D
Subjects:
High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Experiment (hep-ex); Nuclear Theory (nucl-th)
arXiv:
2409.07235 [pdf]
PRD(2024)·4 citations
12
[Submitted on 11 Sept 2024] (cross-list from nucl-ex)
$^{61}$ Cr as a Doorway to the N = 40 Island of Inversion
L. Lalanne🇧🇪 · M. Athanasakis-Kaklamanakis🇧🇪 · D. D. Dao🇫🇷 · Á. Koszorús🇧🇪 · Y. C. Liu🇨🇳 · R. Mancheva🇧🇪 · F. Nowacki🇫🇷 · J. Reilly🇬🇧 · C. Bernerd🇨🇭 · K. Chrysalidis🇨🇭 · T. E. Cocolios🇧🇪 · R. P. de Groote🇧🇪 and 15 other authors
This paper reports on the measurement of the ground-state spin and nuclear magnetic dipole moment of $^{61}$ Cr. The radioactive ion beam was produced at the CERN-ISOLDE facility and was probed using high-resolution resonance ionization laser spectroscopy with the CRIS apparatus. The present ground-state spin measurement $I = \frac{1}{2}$ , differing from the previously adopted $I = (\frac{5}{2})$ , has significant consequences on the interpretation of existing beta decay data and nuclear structure in the region. The structure and shape of $^{61}$ Cr is interpreted with state-of-the-art Large-Scale Shell Model and Discrete-Non-Orthogonal Shell Model calculations. From the measured magnetic dipole moment $μ (^{61}$ Cr $) = + 0.539 (7) μ_{N}$ and the theoretical findings, its configuration is understood to be driven by 2 particle - 2 hole neutron excitations with an unpaired $1 p_{1/2}$ neutron. This establishes the western border of the $N = 40$ Island Of Inversion (IoI), characterized by 4 particle - 4 hole neutron components. We discuss the shape evolution along the Cr isotopic chain as a quantum phase transition at the entrance of the $N = 40$ IoI.
Subjects:
Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
arXiv:
2409.07324 [pdf]
PRC(2025)·3 citations

Affiliations

first authorsco-authorsvia INSPIRE

Baryon stopping and charge deposition in heavy-ion collisions due to gluon saturation

Unified and optimal frame choice for generalized parton distributions

Investigations on the equation of state of neutron star matter with density-dependent relativistic mean-field model

Unraveling the Effects of Cluster Transfer-Induced Breakups on 12C Fragmentation in Hadron Therapy

Anisotropic linear waves and breakdown of the momentum expansion in spin magnetohydrodynamics

Phenomenological model for the γ∗γ→ηπ+π− reaction in the f1​(1285) energy region

61Cr as a Doorway to the N = 40 Island of Inversion

Affiliations

Unraveling the Effects of Cluster Transfer-Induced Breakups on $^{12}$ C Fragmentation in Hadron Therapy

Phenomenological model for the $γ^{*} γ \to η π^{+} π^{-}$ reaction in the $f_{1} (1285)$ energy region

$^{61}$ Cr as a Doorway to the N = 40 Island of Inversion