The European Physical Journal A最新文献

{"title":"Neutron Star Properties and Femtoscopic Constraints","authors":"I. Vidaña,&nbsp;V. Mantovani Sarti,&nbsp;J. Haidenbauer,&nbsp;D. L. Mihaylov,&nbsp;L. Fabbietti","doi":"10.1140/epja/s10050-025-01539-z","DOIUrl":"10.1140/epja/s10050-025-01539-z","url":null,"abstract":"<div><p>We construct the equation of state of hypernuclear matter and study the structure of neutron stars employing a chiral hyperon-nucleon interaction of the Jülich–Bonn group tuned to femtoscopic <span>(varLambda p)</span> data of the ALICE Collaboration, and <span>(varLambda varLambda )</span> and <span>(varXi )</span>N interactions determined from lattice QCD calculations by the HAL QCD Collaboration that reproduce the femtoscopic <span>(varLambda varLambda )</span> and <span>(varXi ^-p)</span> data. We employ the ab-initio microscopic Brueckner–Hartree–Fock theory extended to the strange baryon sector. A special focus is put on the uncertainties of the hyperon interactions and how they are effectively propagated to the composition, equation of state, mass-radius relation and tidal deformability of neutron stars. To such end, we consider the uncertainty due to the experimental error of the femtoscopic <span>(varLambda p)</span> data used to fix the chiral hyperon-nucleon interaction and the theoretical uncertainty, estimated from the residual cut-off dependence of this interaction. We find that the final maximum mass of a neutron star with hyperons is in the range 1.3–1.4 <span>(M_odot )</span>, in agreement with previous works. The hyperon puzzle, therefore, remains still an open issue if only two-body hyperon-nucleon and hyperon-hyperon interactions are considered. Predictions for the tidal deformability of neutron stars with hyperons are found to be in agreement with the observational constraints from the gravitational wave event GW170817 in the mass range 1.1–1.3 <span>(M_odot )</span>.</p></div>","PeriodicalId":786,"journal":{"name":"The European Physical Journal A","volume":"61 3","pages":""},"PeriodicalIF":2.6,"publicationDate":"2025-03-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143688381","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Topical issue on radiative corrections: from medium to high energy experiments","authors":"Andrei Afanasev,&nbsp;Jan C. Bernauer,&nbsp;Ethan W. Cline,&nbsp;Ronald Gilman,&nbsp;Andre Peshier,&nbsp;Hubert Spiesberger","doi":"10.1140/epja/s10050-025-01528-2","DOIUrl":"10.1140/epja/s10050-025-01528-2","url":null,"abstract":"","PeriodicalId":786,"journal":{"name":"The European Physical Journal A","volume":"61 3","pages":""},"PeriodicalIF":2.6,"publicationDate":"2025-03-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143698533","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Proton capture on (^{90})Zr revisited","authors":"A. Simon,&nbsp;J. Koros,&nbsp;O. Olivas-Gomez,&nbsp;R. Kelmar,&nbsp;E. Churchman,&nbsp;A. M. Clark,&nbsp;C. Harris,&nbsp;S. L. Henderson,&nbsp;S. E. Kelly,&nbsp;P. Millican,&nbsp;A. Palmisano-Kyle,&nbsp;C. S. Reingold,&nbsp;D. Robertson,&nbsp;E. Stech,&nbsp;A. Spyrou,&nbsp;W. P. Tan","doi":"10.1140/epja/s10050-025-01521-9","DOIUrl":"10.1140/epja/s10050-025-01521-9","url":null,"abstract":"<div><p>The <span>(^{90})</span>Zr(p,<span>(gamma )</span>)<span>(^{91})</span>Nb reaction is one of the important reactions in the <span>(Aapprox 90)</span> mass region and part of the nucleosynthesis path responsible for production of <span>(^{92})</span>Mo during the <span>(gamma )</span>-process. Discrepant data in the literature provide a cross section that varies up to 30% within the Gamow window for the <span>(^{90})</span>Zr(p,<span>(gamma )</span>)<span>(^{91})</span>Nb reaction. Thus, the cross section measurements of <span>(^{90})</span>Zr(p,<span>(gamma )</span>)<span>(^{91})</span>Nb reaction were revisited using the <span>(gamma )</span>-summing technique. The results are consistent with the lower-value cross sections found in the literature. Based on the new data an updated reaction rate for <span>(^{90})</span>Zr(p,<span>(gamma )</span>)<span>(^{91})</span>Nb is provided that is up to 20% higher than that obtained from the <span>non-smoker</span> code.</p></div>","PeriodicalId":786,"journal":{"name":"The European Physical Journal A","volume":"61 3","pages":""},"PeriodicalIF":2.6,"publicationDate":"2025-03-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1140/epja/s10050-025-01521-9.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143645589","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Silicon spin qubits: a viable path towards industrial manufacturing of large-scale quantum processors","authors":"Tristan Meunier,&nbsp;Nicolas Daval,&nbsp;François Perruchot,&nbsp;Maud Vinet","doi":"10.1140/epja/s10050-025-01514-8","DOIUrl":"10.1140/epja/s10050-025-01514-8","url":null,"abstract":"<div><p>Based on silicon, modern computers are engineered and manufactured using advanced Very-Large-Scale Integration technology (VLSI). After significant progress over a series of decades in controlling silicon-based spin qubits, researchers recently demonstrated that good spin qubits can be made out of silicon nanocircuits using the same advanced VLSI technology. This means that it may be possible to leverage all the knowledge of VLSI technology to efficiently build the future of large-scale quantum machines. In this review, we will survey the recent developments in silicon spin qubits and discuss the challenges that remain for building silicon quantum machines.</p></div>","PeriodicalId":786,"journal":{"name":"The European Physical Journal A","volume":"61 3","pages":""},"PeriodicalIF":2.6,"publicationDate":"2025-03-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1140/epja/s10050-025-01514-8.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143645590","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Novel scalings of neutron star properties from analyzing dimensionless Tolman–Oppenheimer–Volkoff equations","authors":"Bao-Jun Cai,&nbsp;Bao-An Li","doi":"10.1140/epja/s10050-025-01507-7","DOIUrl":"10.1140/epja/s10050-025-01507-7","url":null,"abstract":"<div><p>The Tolman–Oppenheimer–Volkoff (TOV) equations govern the radial evolution of pressure and energy density in static neutron stars (NSs) in hydrodynamical equilibrium. Using the reduced pressure and energy density with respect to the NS central energy density, the original TOV equations can be recast into dimensionless forms. While the traditionally used integral approach for solving the original TOV equations require an input nuclear Equation of State (EOS), the dimensionless TOV equations can be anatomized by using the reduced pressure and energy density as polynomials of the reduced radial coordinate without using any input nuclear EOS. It has been shown in several of our recent works that interesting and novel perspectives about NS core EOS can be extracted directly from NS observables by using the latter approach. Our approach is based on <u>i</u>ntrinsic and <u>p</u>erturbative <u>a</u>nalyses of the <u>d</u>imensionless (IPAD) TOV equations (IPAD-TOV). In this review article, we first discuss the length and energy density scales of NSs as well as the dimensionless TOV equations for scaled variables and their perturbative solutions near NS cores. We then review several new insights into NS physics gained from solving perturbatively the scaled TOV equations. Whenever appropriate, comparisons with the traditional approach from solving the original TOV equations will be made. In particular, we first show that the nonlinearity of the TOV equations basically excludes a linear EOS for dense matter in NS cores. We then show that perturbative analyses of the scaled TOV equations enable us to reveal novel scalings of the NS mass, radius and the compactness with certain combinations of the NS central pressure and energy density. Thus, observational data on either mass, radius or compactness can be used to constrain directly the core EOS of NS matter independent of the still very uncertain nuclear EOS models. As examples, the EOS of the densest visible matter in our Universe before the most massive neutron stars collapse into black holes (BHs) as well as the central EOS of a canonical or a 2.1 solar mass NS are extracted without using any nuclear EOS model. In addition, we show that causality in NSs sets an upper bound of about 0.374 for the ratio of pressure over energy density and correspondingly a lower limit for trace anomaly in supra-dense matter. We also demonstrate that the strong-field gravity plays a fundamental role in extruding a peak in the density/radius profile of the speed of sound squared (SSS) in massive NS cores independent of the nuclear EOS. Finally, some future perspectives of NS research using the new approach reviewed here by solving perturbatively the dimensionless TOV equations are outlined.</p></div>","PeriodicalId":786,"journal":{"name":"The European Physical Journal A","volume":"61 3","pages":""},"PeriodicalIF":2.6,"publicationDate":"2025-03-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1140/epja/s10050-025-01507-7.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143638637","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Photon Leading Twist Transverse Momentum Dependent Parton Distributions","authors":"Satyajit Puhan,&nbsp;Narinder Kumar,&nbsp;Harleen Dahiya","doi":"10.1140/epja/s10050-025-01527-3","DOIUrl":"10.1140/epja/s10050-025-01527-3","url":null,"abstract":"<div><p>In this work, we have calculated the photon leading-twist T-even transverse momentum dependent parton distribution functions (TMDs). For these calculations, we have treated photon as a state of quark anti-quark pair and represent the TMDs in explicit form of helicity amplitudes. We have presented all the T-even TMDs for the photon being massless (real) and massive (virtual). We have also compared our longitudinally and transversely polarized TMDs results for different photon masses. The collinear parton distribution functions (PDFs) have been predicted for both the real and virtual photon cases. The results for the unpolarized PDF of our calculations are in good agreement with other model predictions. In addition to this, we have also discussed the spin-spin correlations between the quark and photon.</p></div>","PeriodicalId":786,"journal":{"name":"The European Physical Journal A","volume":"61 3","pages":""},"PeriodicalIF":2.6,"publicationDate":"2025-03-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143638633","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Effective theories for nuclei at high energies","authors":"Oscar Garcia-Montero,&nbsp;Sören Schlichting","doi":"10.1140/epja/s10050-025-01523-7","DOIUrl":"10.1140/epja/s10050-025-01523-7","url":null,"abstract":"<div><p>We discuss the application of the Color Glass Condensate (CGC), an effective field theory of Quantum Chromodynamics (QCD), to describe high-energy nuclear interactions. We first provide an introduction to the methods and language of the CGC, its role in understanding gluon saturation in heavy-ion collisions at the LHC and RHIC, and its relevance in various scattering processes such as Deep Inelastic Scattering (DIS). The application of the CGC effective field theory to describe hadron-hadron collisions is discussed in the scope of asymmetric <i>dilute-dense</i> collisions, and Heavy-Ion Collisions in the <i>dense-dense</i> limit. The review covers theoretical foundations, recent advancements, and phenomenological applications, focusing on using the CGC to determine the initial conditions of heavy-ion collisions.</p></div>","PeriodicalId":786,"journal":{"name":"The European Physical Journal A","volume":"61 3","pages":""},"PeriodicalIF":2.6,"publicationDate":"2025-03-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1140/epja/s10050-025-01523-7.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143638627","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Study of the deuterons emission time in pp collisions at the LHC via kaon-deuteron correlations","authors":"O. Vázquez Doce,&nbsp;D. L. Mihaylov,&nbsp;L. Fabbietti","doi":"10.1140/epja/s10050-025-01534-4","DOIUrl":"10.1140/epja/s10050-025-01534-4","url":null,"abstract":"<div><p>The femtoscopy correlation between positively charged kaons and deuterons measured in pp collisions at <span>(sqrt{s}=)</span> 13 TeV at the LHC with the ALICE experiment is employed to determine the upper limit for the time delay of the deuteron emission in such collisions with respect to all other hadrons. Two scenarios are considered: the first assumes that deuterons form following the decays of short-lived strong resonances, while the second assumes that deuteron production occurs simultaneously with all other primary hadrons. For both scenarios, an additional delay time for deuteron formation can be introduced using the CECA source model and its upper limit can be extracted by fitting the femtoscopy correlation, incorporating models of the final state K<span>(^+)</span> d strong interaction. For the scenario where deuterons production is affected by baryonic resonances the upper limit of the time delay is 2.25 fm/<i>c</i>, while for the primary production scenario the upper limit is 4.75 fm/<i>c</i>. These results align with the hypothesis of an early formation of the deuteron as an extended, weakly bound composite object in ultra-relativistic proton-proton collisions at the LHC.</p></div>","PeriodicalId":786,"journal":{"name":"The European Physical Journal A","volume":"61 3","pages":""},"PeriodicalIF":2.6,"publicationDate":"2025-03-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143632561","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Nuclear reaction modeling of neutron induced reactions on (^{208})Pb","authors":"Wenqing Du,&nbsp;Xiuniao Zhao","doi":"10.1140/epja/s10050-025-01532-6","DOIUrl":"10.1140/epja/s10050-025-01532-6","url":null,"abstract":"<div><p>Theoretical calculation of neutron induced reactions on <span>(^{208})</span>Pb is undertaken. Neutron reaction modeling for this double-magic target nucleus is challenging. A dispersive optical model combined with the distorted wave Born approximation (DWBA) method, exciton model and Hauser-Feshbach theory width fluctuation corrections are used to calculate neutron induced reactions on <span>(^{208})</span>Pb. Calculation results are shown to be in good agreement with experimental data. This comprehensive calculation allows to derive consistent elastic cross section up to 10 MeV, where both the direct and compound contributions are important. Present calculations will be used as a basis of new evaluation of neutron induced reactions of lead nuclei.</p></div>","PeriodicalId":786,"journal":{"name":"The European Physical Journal A","volume":"61 3","pages":""},"PeriodicalIF":2.6,"publicationDate":"2025-03-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143632506","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Plasma-delay studies on heavy ion detection using PIPS at the LOHENGRIN recoil separator","authors":"Ana M. Gómez L.,&nbsp;Ali Al-Adili,&nbsp;Diego Tarrío,&nbsp;Andreas Solders,&nbsp;Zhihao Gao,&nbsp;Alf Göök,&nbsp;Stephan Pomp,&nbsp;André Poussette,&nbsp;Samuel Bennett,&nbsp;Yung Hee Kim,&nbsp;Ulli Köster,&nbsp;Andreas Oberstedt,&nbsp;Gavin Smith,&nbsp;Nikolay V. Sosnin,&nbsp;Stephan Oberstedt","doi":"10.1140/epja/s10050-025-01509-5","DOIUrl":"10.1140/epja/s10050-025-01509-5","url":null,"abstract":"<div><p>The VERDI fission spectrometer is designed to measure fragment velocities and kinetic energies to achieve high-precision yield measurements. It consists of two time-of-flight (TOF) sections, each hosting a micro-channel plate (MCP) and up to 32 passivated implanted planar silicon (PIPS) detectors. The main challenge to achieve accurate fragment velocities is the so-called plasma delay time (PDT) phenomena in the PIPS detectors. In this work, we present a dedicated experimental campaign at the LOHENGRIN fission-fragment recoil separator, to solve the pending PDT challenges. The PDT effect was systematically investigated, as a function of mass and energy, using a dedicated time-of-flight setup. In addition, the pulse height defect (PHD) was determined simultaneously. The studies were conducted for five PIPS detectors, in energies and mass numbers ranging from 20 to 110 MeV and A = 85 to 149, respectively. Using digital signal processing, an excellent timing resolution was achieved, reaching as low as 60 ps (one <span>(sigma )</span>) for the heavy ions. The PDT revealed a strong positive correlation with the ion energy and a weak negative correlation with the mass. The experimental PDT values determined from five detectors confirm a consistent systematic behavior with respect to mass and energy. Some systematic discrepancies were exhibited by two detectors, possibly due to the use of different pre-amplification chains. The PDT measurements ranged between 1 and 3.5 ns, for heavy ions relative to <span>(alpha )</span>-particles. The PHD values showed also a strong correlation with the ion energy, and moreover with the ion mass. The PHD for heavy ions was found to range between 2 and 8 MeV, relative to <span>(alpha )</span>-particles. Finally, a two-dimensional parameterisation was developed to model the experimental PDT data, as a function of mass and energy. This new model, which is valid in the fission fragment mass and energy regime, will be of benefit for heavy-ion velocity measurements, using silicon detectors, as done in VERDI.</p></div>","PeriodicalId":786,"journal":{"name":"The European Physical Journal A","volume":"61 3","pages":""},"PeriodicalIF":2.6,"publicationDate":"2025-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1140/epja/s10050-025-01509-5.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143622117","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}