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        <title>Frontiers in Physics | Nuclear Physics​ section | New and Recent Articles</title>
        <link>https://www.frontiersin.org/journals/physics/sections/nuclear-physics</link>
        <description>RSS Feed for Nuclear Physics​ section in the Frontiers in Physics journal | New and Recent Articles</description>
        <language>en-us</language>
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        <pubDate>2026-04-05T03:50:46.472+00:00</pubDate>
        <ttl>60</ttl>
        <item>
        <guid isPermaLink="true">https://www.frontiersin.org/articles/10.3389/fphy.2026.1750902</guid>
        <link>https://www.frontiersin.org/articles/10.3389/fphy.2026.1750902</link>
        <title><![CDATA[Exact Bethe Ansatz for the vibron model: a critical reassessment of q-deformation and parameterization]]></title>
        <pubdate>2026-02-18T00:00:00Z</pubdate>
        <category>Original Research</category>
        <author>Amir Jalili</author><author>Ziba Saleki</author><author>E. Guliyev</author><author>H. Quliyev</author><author>Ai-Xi Chen</author>
        <description><![CDATA[The vibron model classifies energy spectra through U(n)→ SO(n) irreducible representation (irrep) branching, enabling exploration of quantum phase transitions between vibrational and rotational regimes. We advance a solvable Bethe Ansatz framework, deriving exact solutions for the vibron Hamiltonian and addressing discrepancies in prior studies. By applying algebraic techniques, we demonstrate that precise control parameters—rather than q-deformation—are essential for accurate spectral predictions. This study critically reassesses existing computational methods, emphasizing parameter optimization to improve alignment with experimental data. Our refined approach accurately reproduces the procedure for obtaining reproducible molecular energy spectra, elucidating the impact of control parameters on quantum phase transitions.]]></description>
      </item><item>
        <guid isPermaLink="true">https://www.frontiersin.org/articles/10.3389/fphy.2025.1688864</guid>
        <link>https://www.frontiersin.org/articles/10.3389/fphy.2025.1688864</link>
        <title><![CDATA[Estimation of the effect of Tsallis non-extensive statistics on the 14C(n,γ)15C reaction rate]]></title>
        <pubdate>2025-11-25T00:00:00Z</pubdate>
        <category>Original Research</category>
        <author>A. S. Tkachenko</author><author>N. A. Burkova</author><author>B. M. Yeleusheva</author><author>S. B. Dubovichenko</author>
        <description><![CDATA[The total cross-section of the radiative neutron capture reaction 14С(n,γ0+1)15C—for energies ranging from 10 meV to 5 MeV—is considered. Calculations performed in the framework of the modified potential cluster model with forbidden states show an agreement of total cross-section σ (23.3 keV) = 4.75 μb with the presently recommended value 4.86(48) μb by Ma et al., 2020. The efficiency of carbon isotope 15C production is illustrated by the 14С(n,γ0+1)15C reaction rate calculated at temperatures from T9 = 0.001 to T9 = 10. The conventional Maxwell–Boltzmann weighted reaction rate σvMB of the present work is comparable, with less than 10% accuracy, with the latest calculations by Ma et al., 2020 and Bhattacharyya et al., 2021. The estimation of non-extensive effects is implemented using our data on the reaction rate σvMB as reference values. The efficiency of carbon isotope production in radiative capture reactions 12-14С(n,γ)13-15C is estimated based on the calculated reaction rates. The influence of the Maxwellian-weighted 12-14C(n,γ)13-15C reaction rates on the ratios 12C/13C and 13C/14C is examined. Tsallis statistics is applied for the first time to the calculation of the 14С(n,γ0)15C reaction rate with values of non-extensive parameter 0.7 ≤ q ≤ 1.3 on the background of Maxwell–Boltzmann statistics corresponding to q = 1. The reaction rate σvq shows a factor ∼4 increase for q = 0.7 and a factor ∼0.6 decrease for q = 1.3 compared to q = 1.]]></description>
      </item><item>
        <guid isPermaLink="true">https://www.frontiersin.org/articles/10.3389/fphy.2025.1644477</guid>
        <link>https://www.frontiersin.org/articles/10.3389/fphy.2025.1644477</link>
        <title><![CDATA[Atomic mass measurements of neutron-rich nuclides on the path to 78Ni with a β-TOF-equipped MRTOF device]]></title>
        <pubdate>2025-11-18T00:00:00Z</pubdate>
        <category>Original Research</category>
        <author>W. Xian</author><author>M. Rosenbusch</author><author>V. H. Phong</author><author>M. Wada</author><author>P. Schury</author><author>D. Hou</author><author>A. Takamine</author><author>S. Chen</author><author>T. Niwase</author><author>Y. Hirayama</author><author>H. Ishiyama</author><author>S. Iimura</author><author>Y. Ito</author><author>T. M. Kojima</author><author>S. Kimura</author><author>J. Liu</author><author>J. Lee</author><author>S. Michimasa</author><author>H. Miyatake</author><author>J. Y. Moon</author><author>M. Mukai</author><author>S. Nishimura</author><author>S. Naimi</author><author>T. Sonoda</author><author>Y. X. Watanabe</author><author>H. Wollnik</author><author>S. Yan</author>
        <description><![CDATA[We report atomic mass measurements of the unstable nuclides 73−75Ni, 73−78Cu, and 74−78Zn, which have been accomplished using multi-reflection time-of-flight mass spectrometry combined with new technical developments to resolve challenges for exotic-isotope identification and selection. The isotopes were produced in-flight at the RIKEN’s Radioactive Ion Beam Facility and delivered to the combined gas cell and multi-reflection system installed downstream of the ZeroDegree spectrometer. The incoming high-energy beam was energy-degraded and subsequently stopped in a helium gas cell. The energy degrader thickness was optimized using a new method that employs signals from plastic scintillators located upstream and downstream of the helium-filled gas cell. Extracted isotopes of interest were mass-selected by the in-MRTOF deflector method, for which we discuss simultaneous selection of multiple isobar chains. The ions of interest were identified unambiguously using β-decay-correlated mass measurements for the first time, which is demonstrated for 78Zn. The new mass values are compared with literature values and recent measurements performed at JYFLTRAP and ISOLTRAP, where a generally good agreement is observed.]]></description>
      </item><item>
        <guid isPermaLink="true">https://www.frontiersin.org/articles/10.3389/fphy.2025.1713658</guid>
        <link>https://www.frontiersin.org/articles/10.3389/fphy.2025.1713658</link>
        <title><![CDATA[Kinetic freeze-out properties from transverse momentum spectra of kaon, pion, and (anti-)proton production in U+U collisions at sNN = 193 GeV]]></title>
        <pubdate>2025-11-11T00:00:00Z</pubdate>
        <category>Original Research</category>
        <author>Ying Yuan</author>
        <description><![CDATA[In the framework of the multi-source thermal model employing the Tsallis distribution, the transverse momentum distributions of kaon, pion, and (anti-)proton production in U + U collisions at sNN = 193 GeV with varying centrality are investigated. The transverse momentum spectra are appropriately characterized. The dependencies of parameters (average transverse momenta, effective temperature, and entropy index) on event centrality are determined. It is observed that the q parameters increase as the average number of particles participating in the collisions rises, which implies that the nuclear stopping degree elevates with the increase of collision centrality. The T value remains fundamentally consistent for the same particle under different collision parameters, suggesting that the kinetic freezing temperature of particle ejection in this collision system is independent of the collision parameters. However, the q value exceeded the previously determined research range, which might be related to the deformation of the U-nucleus.]]></description>
      </item><item>
        <guid isPermaLink="true">https://www.frontiersin.org/articles/10.3389/fphy.2025.1653635</guid>
        <link>https://www.frontiersin.org/articles/10.3389/fphy.2025.1653635</link>
        <title><![CDATA[The pn interaction and isospin symmetry]]></title>
        <pubdate>2025-09-25T00:00:00Z</pubdate>
        <category>Original Research</category>
        <author>R. B. Cakirli</author><author>K. Blaum</author><author>R. F. Casten</author>
        <description><![CDATA[A possible correlation between isospin symmetry/breaking and the average proton-neutron interaction of the last particles, δVpn, is discussed. This correlation is tested for Tz = ±1/2 mirror nuclei in terms of a differential of δVpn, Δ(δVpn), and their low-lying excited levels. Some nuclei, whose mass measurements will be useful for future studies, are suggested.]]></description>
      </item><item>
        <guid isPermaLink="true">https://www.frontiersin.org/articles/10.3389/fphy.2025.1629987</guid>
        <link>https://www.frontiersin.org/articles/10.3389/fphy.2025.1629987</link>
        <title><![CDATA[Electric dipole polarizability constraints on neutron skin and symmetry energy]]></title>
        <pubdate>2025-08-22T00:00:00Z</pubdate>
        <category>Review</category>
        <author>Peter von Neumann-Cosel</author><author>Atsushi Tamii</author>
        <description><![CDATA[We review the experimental knowledge on the dipole polarizability (DP) of nuclei and its relation to the neutron skin thickness and properties of the neutron-rich matter equation of state (EOS). The discussion focuses on recent experiments using relativistic Coulomb excitation in inelastic proton scattering at extreme forward angles covering a mass range from 40Ca to 208Pb. Constraints on the neutron skins and the density dependence of the symmetry energy are derived from a systematic comparison to calculations based on density functional theory (DFT) and ab initio methods utilizing interactions derived from chiral effective field theory (χEFT). The results consistently favor a soft EOS around or slightly below the saturation point. An outlook is provided on possible improvements in the precision achievable in stable nuclei and studies of exotic neutron-rich unstable nuclei with upcoming experimental facilities.]]></description>
      </item><item>
        <guid isPermaLink="true">https://www.frontiersin.org/articles/10.3389/fphy.2025.1637560</guid>
        <link>https://www.frontiersin.org/articles/10.3389/fphy.2025.1637560</link>
        <title><![CDATA[Editorial: Neutron skin thickness in atomic nuclei: current status and recent theoretical, experimental and observational developments]]></title>
        <pubdate>2025-07-01T00:00:00Z</pubdate>
        <category>Editorial</category>
        <author>Masayuki Matsuzaki</author><author>Tomotsugu Wakasa</author><author>Mitko Gaidarov</author><author>Oscar Moreno</author>
        <description></description>
      </item><item>
        <guid isPermaLink="true">https://www.frontiersin.org/articles/10.3389/fphy.2025.1537948</guid>
        <link>https://www.frontiersin.org/articles/10.3389/fphy.2025.1537948</link>
        <title><![CDATA[Direct reactions for astrophysical p-capture rates with ORRUBA and GODDESS]]></title>
        <pubdate>2025-06-26T00:00:00Z</pubdate>
        <category>Review</category>
        <author>S. D. Pain</author>
        <description><![CDATA[Understanding the nucleosynthesis and energy generation in quiescent and explosive stellar burning requires a detailed understanding of reaction rates on many unstable nuclides. Such reaction rates are often governed by the properties of low-lying, isolated proton resonances. Though direct measurements of resonance strengths are ultimately desired, and are a focus of rare isotope beam facilities worldwide, such tour-de-force experiments must be guided by indirect techniques, in order to know resonance energies, Jπ assignments, and estimated widths, to inform targeted measurements. Furthermore, some important low-lying resonances may be too weak for direct measurements with radioactive beams, and indirect techniques provide the only practical constraints. Additionally, there has been growing interest in the astrophysical role of isomeric states, which can influence the reaction flow in nucleosynthetic reaction networks, and hence impact the quantitative interpretation of astronomical observables, such as γ-ray signatures, and elemental and isotopic ratios. Properties of single-proton resonances can be obtained by exploiting the selectivity of direct reactions, such as single-nucleon transfer and charge-exchange reactions. Constraining proton-capture rates via direct reactions has been a focus of the astrophysics program at ORNL for over two decades, spurring the development of the ORRUBA and GODDESS detector systems. Herein, a review of recent developments in instrumentation and radioactive beam delivery (including isomeric beam experiments) is presented, along with some specific examples of astrophysically interesting sd-shell nuclides, which have been a target of recent ORRUBA and GODDESS experiments.]]></description>
      </item><item>
        <guid isPermaLink="true">https://www.frontiersin.org/articles/10.3389/fphy.2025.1643501</guid>
        <link>https://www.frontiersin.org/articles/10.3389/fphy.2025.1643501</link>
        <title><![CDATA[Editorial: Modern advances in direct reactions for nuclear structure]]></title>
        <pubdate>2025-06-20T00:00:00Z</pubdate>
        <category>Editorial</category>
        <author>A. H. Wuosmaa</author><author>S. J. Freeman</author><author>B. P. Kay</author>
        <description></description>
      </item><item>
        <guid isPermaLink="true">https://www.frontiersin.org/articles/10.3389/fphy.2025.1525170</guid>
        <link>https://www.frontiersin.org/articles/10.3389/fphy.2025.1525170</link>
        <title><![CDATA[Systematic study of the propagation of uncertainties to transfer observables]]></title>
        <pubdate>2025-06-05T00:00:00Z</pubdate>
        <category>Original Research</category>
        <author>C. Hebborn</author><author>F. M. Nunes</author>
        <description><![CDATA[A systematic study of parametric uncertainties in transfer reactions is performed using the recently developed uncertainty quantified global optical potential (KDUQ). We consider reactions on the doubly-magic spherical nucleus 48Ca and explore the dependence of the predicted (d,p) angular distribution uncertainties at different beam energies and for different properties of the final single-particle state populated by the reaction. Our results show that correlations between the uncertainties associated with the bound state potential and with the optical potentials may be important for correctly determining the uncertainty in the transfer cross sections (in our case, these do not add in quadrature). In general, we find small uncertainties in the predicted transfer observables: half-width of the 68% credible interval is roughly 5−10%, which is comparable to the experimental error on the transfer data. Finally, our results show that the relative magnitude of the parametric uncertainty in transfer observables increases with the beam energy and does not depend strongly on the properties of the final state.]]></description>
      </item><item>
        <guid isPermaLink="true">https://www.frontiersin.org/articles/10.3389/fphy.2025.1581854</guid>
        <link>https://www.frontiersin.org/articles/10.3389/fphy.2025.1581854</link>
        <title><![CDATA[Nuclear radii from first principles]]></title>
        <pubdate>2025-05-09T00:00:00Z</pubdate>
        <category>Review</category>
        <author>Takayuki Miyagi</author>
        <description><![CDATA[With the combination of nuclear interactions from chiral effective field theory and various many-body techniques, one can perform systematically improvable ab initio calculations. As the improvable framework enables us to quantify the uncertainty, it is particularly useful to make a prediction for which performing experiments is difficult or even impossible. Neutron skin thickness, the difference between neutron and proton distribution radii, is a key quantity related to the properties of infinite nuclear matter. Since neutrons do not have a net electric charge, the neutron-distribution radius is difficult to measure, preventing precise measurement of neutron skin thickness. On the other hand, recent developments in laser spectroscopy techniques can provide detailed information on the charge distribution and opportunities for detailed comparisons to theoretical results. Testing the theoretical frameworks with the measurable charge radii should be a step toward predicting other quantities, such as neutron skin thickness. This contribution reviews recent advances in nuclear radii and neutron skin from ab initio calculations.]]></description>
      </item><item>
        <guid isPermaLink="true">https://www.frontiersin.org/articles/10.3389/fphy.2025.1539148</guid>
        <link>https://www.frontiersin.org/articles/10.3389/fphy.2025.1539148</link>
        <title><![CDATA[Direct reactions with the AT-TPC]]></title>
        <pubdate>2025-03-24T00:00:00Z</pubdate>
        <category>Original Research</category>
        <author>Yassid Ayyad</author><author>Daniel Bazin</author><author>Francesca Bonaiti</author><author>Jie Chen</author><author>Xiaobin Li</author><author>Adam Anthony</author><author>Melina Avila</author><author>Saul Beceiro-Novo</author><author>Khushi Bhatt</author><author>Cristina Cabo</author><author>Tatsuya Furuno</author><author>Valdir Guimarães</author><author>Alex Hall-Smith</author><author>Curtis Hunt</author><author>Heshani Jayatissa</author><author>Takahiro Kawabata</author><author>Harriet Kumi</author><author>Jose Manuel López-González</author><author>Juan Lois-Fuentes</author><author>Augusto Macchiavelli</author><author>Gordon McCann</author><author>Claus Müller-Gatermann</author><author>Alicia Muñoz-Ramos</author><author>Wolfgang Mittig</author><author>Bruno Olaizola</author><author>Zarif Rahman</author><author>Daniel Regueira</author><author>Javier Rufino</author><author>Soki Sakajo</author><author>Clementine Santamaria</author><author>Michael Z. Serikow</author><author>Tianxudong Tang</author><author>Ivan Tolstukhin</author><author>Nathan Turi</author><author>Nathan Watwood</author><author>Juan Zamora</author>
        <description><![CDATA[IntroductionDirect reactions are crucial tools for accessing properties of the atomic nucleus. Fundamental and exotic phenomena such as collective modes, pairing, weakbinding effects and evolution of single-particles energies can be investigated in peripheral collisions between a heavy nucleus and a light target. The necessity of using inverse kinematics to reveal how these structural properties change with isospin imbalance renders direct reactions a challenging technique when using the missing mass method.MethodsIn this scenario, Active Target Time Projection Chambers (AT-TPC) have demonstrated an outstanding performance in enabling these types of reactions even under conditions of very low beam intensities. The AT-TPC of the Facility for Rare Isotope Beams (FRIB) is a next generation multipurpose Active Target. When operated inside a solenoidal magnet, direct reactions benefit from the measurement of the magnetic rigidity that enables particle identification and the determination of the excitation energy with high resolution without the need of auxiliary detectors. Additionally, the AT-TPC can be coupled to a magnetic spectrometer improving even further its spectroscopic investigation capability.ResultsIn this contribution, we discuss inelastic scattering and transfer reaction data obtained via the AT-TPC and compare them to theory. In particular, we present the results for the 14C(p,p′) and 12Be (p,d)11Be reactions.DiscussionFor 14C, we compare the experimental excitation energy of the first 1– excited state with coupled-cluster calculationsbased on nuclear interactions from chiral effective field theory and with available shell-model predictions. For 12Be, we determine the theoretical spectroscopic factors of the 12Be (p,d)11Be transfer reaction in the shell modeland compare them to the experimental excitation spectrum from a qualitative standpoint.]]></description>
      </item><item>
        <guid isPermaLink="true">https://www.frontiersin.org/articles/10.3389/fphy.2025.1530428</guid>
        <link>https://www.frontiersin.org/articles/10.3389/fphy.2025.1530428</link>
        <title><![CDATA[Some aspects of the quenching of single-particle strength in atomic nuclei]]></title>
        <pubdate>2025-03-19T00:00:00Z</pubdate>
        <category>Original Research</category>
        <author>Augusto O. Macchiavelli</author><author>Stefanos Paschalis</author><author>Marina Petri</author>
        <description><![CDATA[In this article, we discuss some aspects of the quenching of the single-particle strength with emphasis on the isospin dependence of long- and short-range correlations. A phenomenological analysis that connects recent Jefferson Laboratory studies with data on spectroscopic factors, is contrasted with the results of the Dispersive Optical Model approach. We consider some consequences of the model on the nature of the dressed nucleons in the nuclear medium, their effective masses, as well as other aspects of nuclear structure such as charge radii, effective charges, and spin-spin correlations. Qualitative estimates indicate that short-range correlations must play a significant role on those aspects. Despite the fact that our conclusions are perhaps speculative at this stage, we trust that the results will stimulate further experimental and theoretical work, specifically on exotic nuclei far from stability.]]></description>
      </item><item>
        <guid isPermaLink="true">https://www.frontiersin.org/articles/10.3389/fphy.2025.1484460</guid>
        <link>https://www.frontiersin.org/articles/10.3389/fphy.2025.1484460</link>
        <title><![CDATA[Re-examining the impact of 63Co and 63Ni in the stellar environment]]></title>
        <pubdate>2025-03-10T00:00:00Z</pubdate>
        <category>Original Research</category>
        <author>Abdul Kabir</author><author>Jameel-Un Nabi</author><author>Hamad Almujibah</author><author>Izzah Anwaar</author><author>Noor-Ul Ain Raza</author>
        <description><![CDATA[The nuclear ground state properties of 63Co and 63Ni nuclei have been investigated within the framework of the relativistic mean field (RMF) approach. The RMF model with density-dependent meson-exchange (DD-ME2) interaction is used to calculate the potential energy curves (PECs) and nuclear ground state deformation parameters (β2) of 63Co and 63Ni. The blocking effects of the unpaired nucleon are considered using the equal filling approach for the odd-A system. Later, the β-decay properties, including the stellar weak rates and Gamow–Teller (GT) strength of 63Co and 63Ni, are studied using the proton-neutron quasiparticle random-phase approximation (pn-QRPA) model. The β2 values computed from the RMF model are employed in the pn-QRPA framework as an input parameter for the calculations of β-decay properties for 63Co and 63Ni. The stellar rates are compared with the projected shell model (PSM) results. For all densities, the pn-QRPA rates are found to be higher than the stellar rates computed via the PSM to a factor of 1.3 or more. The findings reported in the present investigation might be useful for simulating the late-stage stellar evolution of massive stars and the s-process of nucleosynthesis.]]></description>
      </item><item>
        <guid isPermaLink="true">https://www.frontiersin.org/articles/10.3389/fphy.2025.1510848</guid>
        <link>https://www.frontiersin.org/articles/10.3389/fphy.2025.1510848</link>
        <title><![CDATA[Systematic trends in the spin-orbit splitting toward weak-binding]]></title>
        <pubdate>2025-02-18T00:00:00Z</pubdate>
        <category>Brief Research Report</category>
        <author>Jie Chen</author>
        <description><![CDATA[Spin–orbital (SO) splitting in atomic nuclei results from the coupling between a nucleon’s spin and its orbital angular momentum, fundamentally influencing nuclear structure, especially near the magic numbers. This paper reviews the impact of various effects on SO-splitting, including tensor and weak-binding effects in neutron-rich and weakly bound nuclei, focusing on both theoretical interpretations and recent experimental results. The study summarizes new experimental results on SO-splitting in isotopes such as 34Si, 32Si, and 132Sn, showing a consistent smooth reduction in SO energy for weakly bound orbits, attributed to extended radial wave functions rather than a reduced SO potential strength. These findings reinforce the need for further experimental research with advanced radioactive ion beam facilities to understand the intricate behaviors of SO interactions in exotic nuclei.]]></description>
      </item><item>
        <guid isPermaLink="true">https://www.frontiersin.org/articles/10.3389/fphy.2025.1518626</guid>
        <link>https://www.frontiersin.org/articles/10.3389/fphy.2025.1518626</link>
        <title><![CDATA[Distance of interaction: a phenomenological analysis of elastic scattering data induced by light projectiles]]></title>
        <pubdate>2025-02-11T00:00:00Z</pubdate>
        <category>Original Research</category>
        <author>Valdir Guimarães</author><author>Pierre Camilo Nistal</author><author>Sunday D. Olorunfunmi</author><author>Roberto Linares</author><author>Jesus Lubian</author>
        <description><![CDATA[IntroductionA phenomenological analysis, based on distances, has been performed for elastic scattering data induced by tightly bound (11B, 12C, and 16O), weakly bound (6Li, 7Li, 7Be, and 9Be), and exotic (6He, 8B, 11Be, and 15C) nuclei on light (27Al), medium (58Ni and 120Sn), and heavy mass (208Pb) targets, respectively, at energies close to the Coulomb barrier.MethodsThe cross-section data on the angular distributions have been converted as a function of the distance of the closest approach.ResultsFrom a fitting analysis, critical interaction and strong absorption distances were extracted from the data.DiscussionCorrelation was observed with the projectile cluster configuration for the data on the target 208Pb.]]></description>
      </item><item>
        <guid isPermaLink="true">https://www.frontiersin.org/articles/10.3389/fphy.2024.1531475</guid>
        <link>https://www.frontiersin.org/articles/10.3389/fphy.2024.1531475</link>
        <title><![CDATA[Novel features of asymmetric nuclear matter from terrestrial experiments and astrophysical observations of neutron stars]]></title>
        <pubdate>2025-02-06T00:00:00Z</pubdate>
        <category>Review</category>
        <author>Tsuyoshi Miyatsu</author><author>Myung-Ki Cheoun</author><author>Kyungsik Kim</author><author>Koichi Saito</author>
        <description><![CDATA[The accurate measurement of neutron skin thickness of 208Pb by the PREX Collaboration suggests a large value of the nuclear symmetry energy slope parameter, L, whereas the smaller L is preferred to account for the small neutron-star radii from NICER observations. To resolve this discrepancy between nuclear experiments and astrophysical observations, new effective interactions have been developed using relativistic mean-field models with the isoscalar- and isovector-meson mixing. We investigate the effects of δ-nucleon coupling and σ–δ mixing on the ground-state properties of finite nuclei, as well as the characteristics of isospin-asymmetric nuclear matter and neutron stars. Additionally, we explore the role of the quartic ρ-meson self-interaction in dense nuclear matter to mitigate the stiff equation of state for neutron stars resulting from the large δ-nucleon coupling. It is found that the nuclear symmetry energy undergoes a sudden softening at approximately twice the saturation density of nuclear matter, taking into account the PREX-2 result, the recent NICER observation of PSR J0437−4715, and the binary neutron star merger, GW170817.]]></description>
      </item><item>
        <guid isPermaLink="true">https://www.frontiersin.org/articles/10.3389/fphy.2025.1490337</guid>
        <link>https://www.frontiersin.org/articles/10.3389/fphy.2025.1490337</link>
        <title><![CDATA[Consistent analyses for determination of the point-nucleon distributions by electron and proton scattering]]></title>
        <pubdate>2025-01-31T00:00:00Z</pubdate>
        <category>Original Research</category>
        <author>Toshio Suzuki</author><author>Rika Danjo</author><author>Toshimi Suda</author><author>Masayuki Matsuzaki</author><author>Tomotsugu Wakasa</author>
        <description><![CDATA[Electron scattering cross section, as well as proton scattering cross section, observes the point-proton and the point-neutron distributions, ρτ(r),(τ=p,n), but both cross sections are not able to determine them separately. If they are analyzed consistently with each other, there is a possibility to determine them with less ambiguity. The consistency can be examined through the moments of the charge distribution, ρc(r), which linearly depend on the moments of the point-proton and -neutron distributions, ρτ(r), (τ=p,n). The fourth moment, ⟨ r4 ⟩c, of ρc(r) in 208Pb observed in electron scattering is well-reproduced by the mean square radii, ⟨ r2 ⟩τ, of ρτ(r) obtained consistently in the non-relativistic analyses of electron and proton scattering cross sections. The regression analyses of the non-relativistic mean-field models reproduce well those values of the moments.]]></description>
      </item><item>
        <guid isPermaLink="true">https://www.frontiersin.org/articles/10.3389/fphy.2024.1507544</guid>
        <link>https://www.frontiersin.org/articles/10.3389/fphy.2024.1507544</link>
        <title><![CDATA[Gas jet targets for direct reaction studies]]></title>
        <pubdate>2025-01-29T00:00:00Z</pubdate>
        <category>Perspective</category>
        <author>K. A. Chipps</author>
        <description><![CDATA[The study of direct reactions is of broad interest in nuclear physics, providing constraint to models of nuclear structure evolution and data to better understand the creation of the elements. In many cases, however, the data of interest are hindered by backgrounds and poor resolution from contaminants in either the beam, the target, or both. The use of a gas jet can overcome some of these issues through clever engineering, providing a reaction target that is chemically pure and thin enough to significantly reduce the impact on experimental resolution. This Perspective will discuss the effort to design, construct, and operate gas jet targets for direct reaction studies in the rare isotope era.]]></description>
      </item><item>
        <guid isPermaLink="true">https://www.frontiersin.org/articles/10.3389/fphy.2024.1505076</guid>
        <link>https://www.frontiersin.org/articles/10.3389/fphy.2024.1505076</link>
        <title><![CDATA[Estimation of the freezeout parameters using strange hadrons with changing multiplicity in pp collisions at 7 TeV]]></title>
        <pubdate>2025-01-09T00:00:00Z</pubdate>
        <category>Original Research</category>
        <author>Hilal Ahmad</author><author>Hailong Zhu</author><author>Fu-Hu Liu</author><author>M. Waqas</author><author>Murad Badshah</author><author>Refka Ghodhbani</author>
        <description><![CDATA[We explore the spectra of transverse momenta of hadrons with strange quark content (KS0, ϕ, Λ+Λ̄, Ξ̄+Ξ̄+, and Ω−+Ω̄+) produced in proton–proton collisions at sNN = 7 TeV. We applied Tsallis statistics in a blast wave model (TBW) to the ALICE Collaboration’s experimental data and extracted the freezeout parameters (Tsallis temperature, transverse flow velocity, and the parameter q, which is the non-extensive parameter). The changing trend of these parameters is studied with changing multiplicity. The parameter q decreases while the parameter T and βT increases toward higher multiplicities. βT is noted to drop to zero in the system with the lowest multiplicities. In addition, the interrelationships between the parameters T with βT and T with q are presented where the former correlation is positive and the latter one is negative.]]></description>
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