The European Physical Journal A最新文献

{"title":"Correction to: Superallowed beta-decay between isobaric analog states up to A = 99","authors":"Thomas Faestermann","doi":"10.1140/epja/s10050-026-01886-5","DOIUrl":"10.1140/epja/s10050-026-01886-5","url":null,"abstract":"","PeriodicalId":786,"journal":{"name":"The European Physical Journal A","volume":"62 6","pages":""},"PeriodicalIF":3.0,"publicationDate":"2026-06-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1140/epja/s10050-026-01886-5.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148323119","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":"Density- and energy-dependent LOCV effective interactions based on Reid68 and (triangle )-Reid68 potentials for (^{12})C and (^{16})O elastic scattering","authors":"M. Rahmat","doi":"10.1140/epja/s10050-026-01896-3","DOIUrl":"10.1140/epja/s10050-026-01896-3","url":null,"abstract":"<div><p>Elastic scattering of <span>(^{12})</span>C and <span>(^{16})</span>O ions at several incident energies is investigated within the double-folding model using a density-dependent average effective interaction (DDAEI) derived microscopically from the lowest-order constrained variational (LOCV) approach for symmetric nuclear matter (SNM) based on the bare <i>Reid68</i> and <span>(triangle )</span>-<i>Reid</i>68 nucleon–nucleon (NN) potentials. To account explicitly for the energy dependence of heavy-ion (HI) scattering, a simple linear energy-dependent factor, <i>g</i>(<i>E</i>), is introduced into the effective interaction. This modification provides a realistic description of the energy evolution of the optical potential without resorting to phenomenological density-dependent parametrizations. In addition, the proposed energy-dependent factor significantly improves the numerical convergence of the iterative procedure used to evaluate the exchange part of the folded potential, leading to a noticeable reduction in computational effort. The calculated cross sections for the <span>(^{12})</span>C+<span>(^{12})</span>C and <span>(^{16})</span>O+<span>(^{16})</span>O and <span>(^{16})</span>O+<span>(^{12})</span>C systems are in very good agreement with available experimental data over the full angular range. The results are comparable to those obtained with the widely used DDM3Y1-Reid interaction, while eliminating the need for phenomenological density-dependent adjustments. Moreover, inclusion of the <span>(triangle )</span> isobar in the <span>(triangle )</span>-<i>Reid</i>68 interaction yields consistently improved agreement with measured angular distributions. These findings demonstrate that LOCV-based, energy-dependent effective interactions provide a robust and predictive microscopic framework for heavy-ion elastic scattering.</p></div>","PeriodicalId":786,"journal":{"name":"The European Physical Journal A","volume":"62 6","pages":""},"PeriodicalIF":3.0,"publicationDate":"2026-06-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148281715","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":"Probing alternating-parity bands in even–even nuclei within an axial quadrupole–octupole–hexadecapole collective model","authors":"M. Chabab,&nbsp;A. El Batoul,&nbsp;L. El Ouaourti","doi":"10.1140/epja/s10050-026-01885-6","DOIUrl":"10.1140/epja/s10050-026-01885-6","url":null,"abstract":"<div><p>An analytic quadrupole octupole hexadecapole (QOH) axially symmetric model is used to provide a coherent framework for describing both octupole vibrations and octupole deformations in even–even nuclei. The model offers analytical solutions for the energy spectra and electric E1, E2 and E3 transition probabilities. The spectroscopic features are governed by three physically meaningful parameters: the stiffness constant <span>(c_2)</span>, the hexadecapole deformation parameter <span>(phi _{02})</span>, and the sextic potential parameter <span>(alpha )</span>, directly linked to <span>(phi _{01}^{pi })</span> which represents the interplay between the quadrupole and octupole deformations for both even and odd angular momentum states. The model is applied across a broad range of nuclei including Ra, Th, Sm, Ba, U, Gd, Nd, Rn, Pu, Xe, and Ce isotopes, effectively capturing the characteristic properties of alternating parity bands. Detailed calculations of E1, E2, and E3 transition matrix elements have been performed for <span>(^{220,222})</span>Rn, <span>(^{222,224,228})</span>Ra, and <span>(^{144,146})</span>Ba yielding results in good agreement with available experimental data.</p></div>","PeriodicalId":786,"journal":{"name":"The European Physical Journal A","volume":"62 6","pages":""},"PeriodicalIF":3.0,"publicationDate":"2026-06-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148281716","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":"Digit anomalies in the hadronic mass spectrum, classical and quantum information entropies, and the dynamical QCD scale","authors":"R. da Rocha,&nbsp;R. D. Vilela","doi":"10.1140/epja/s10050-026-01884-7","DOIUrl":"10.1140/epja/s10050-026-01884-7","url":null,"abstract":"<div><p>Quantum Chromodynamics (QCD) has an emergent dynamical energy scale <span>(Lambda _{textrm{QCD}})</span> which sets the threshold between perturbative and nonperturbative regimes. This characteristic scale causes hadronic masses to cluster within certain mass ranges, instead of following a uniform distribution. Analyzing the Shannon information entropy underlying the hadronic mass spectrum, and also other classical information entropies, provides novel insight into this phenomenon, revealing a pronounced deviation from the law of anomalous numbers. This deviation quantifies the emergence of the dynamical scale in strongly interacting systems, also encoding the information-entropy cost associated with the breaking of scale invariance in QCD. Quantum entanglement entropy also reveals correlations across energy scales through the Shannon entropy of the bipartitioned probability distribution, reflecting how the emergence of <span>(Lambda _{textsc {QCD}})</span> shapes the hierarchical structure of the hadronic mass spectrum.</p></div>","PeriodicalId":786,"journal":{"name":"The European Physical Journal A","volume":"62 6","pages":""},"PeriodicalIF":3.0,"publicationDate":"2026-06-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1140/epja/s10050-026-01884-7.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148281409","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":"Photoabsorption cross section in the low-x and low-(Q^2) domain, and DGLAP evolution","authors":"G. R. Boroun,&nbsp;M. Kuroda,&nbsp;Dieter Schildknecht","doi":"10.1140/epja/s10050-026-01874-9","DOIUrl":"10.1140/epja/s10050-026-01874-9","url":null,"abstract":"<div><p>The behavior of the gluon distribution of the proton in the low-<i>x</i>,  low-<span>(Q^2)</span> domain of deep inelastic electron-proton scattering (DIS) is investigated. By considering two-gluon exchange as the dominant interaction in the low-<i>x</i>,  low-<span>(Q^2)</span> domain, we imply the well-known result of scaling of the photoabsorption cross section in terms of the scaling variable <span>(eta (W^2,Q^2).)</span> From this, we derive a reliable result for the gluon distribution at the leading order of the perturbative quantum chromodynamics (pQCD) improved parton model, based on evolution from a starting scale of <span>(Q_0^2cong 2)</span> GeV<span>(^2.)</span> The validity of evolution, when considering its quantitative modification at low-<span>(Q^2)</span> without any alteration at larger values of <span>(Q^2,)</span> leads to a quantitative improvement in the extraction of the gluon distribution based on evolution from a starting scale of <span>(Q^2)</span>, conventionally chosen as <span>(Q^2= Q_0^2cong 2)</span> GeV<span>(^2.)</span></p></div>","PeriodicalId":786,"journal":{"name":"The European Physical Journal A","volume":"62 6","pages":""},"PeriodicalIF":3.0,"publicationDate":"2026-06-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148281509","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":"Few is different: deciphering many-body dynamics in mesoscopic quantum gases","authors":"Juergen Berges,&nbsp;Sandra Brandstetter,&nbsp;Jasmine Brewer,&nbsp;Georg Bruun,&nbsp;Tilman Enss,&nbsp;Stefan Floerchinger,&nbsp;Keisuke Fujii,&nbsp;Maciej Gałka,&nbsp;Giuliano Giacalone,&nbsp;Qingze Guan,&nbsp;Carl Heintze,&nbsp;Lars H. Heyen,&nbsp;Ilya Selyuzhenkov,&nbsp;Selim Jochim,&nbsp;Jesper Levinsen,&nbsp;Philipp Lunt,&nbsp;Silvia Masciocchi,&nbsp;Aleksas Mazeliauskas,&nbsp;Nir Navon,&nbsp;Alice Ohlson,&nbsp;Meera Parish,&nbsp;Stephanie M. Reimann,&nbsp;Francesco Scazza,&nbsp;Thomas Schäfer,&nbsp;Derek Teaney,&nbsp;Joseph Thywissen,&nbsp;Raju Venugopalan,&nbsp;Yangqian Yan,&nbsp;Matteo Zaccanti,&nbsp;Torsten V. Zache","doi":"10.1140/epja/s10050-026-01843-2","DOIUrl":"10.1140/epja/s10050-026-01843-2","url":null,"abstract":"<div><p>Emergent macroscopic descriptions of matter, such as hydrodynamics, are central to our description of complex physical systems across a wide spectrum of energy scales. The conventional understanding of these many-body phenomena has recently been shaken by a number of experimental findings. Collective behavior of matter has been observed in <i>mesoscopic</i> systems, such as high-energy hadron–hadron collisions, or ultracold gases with only a few strongly interacting fermions. In such systems, the separation of scales between macroscopic and microscopic dynamics (at the heart of any effective theory) is inapplicable. To address the conceptual challenges that arise from these observations and explore the universality of emergent descriptions of matter, the EMMI Rapid Reaction Task Force was assembled. This document summarizes the RRTF discussions on recent theoretical and experimental advances in this rapidly developing field. Leveraging technological breakthroughs in the control of quantum systems, we can now quantitatively explore what it means for a system to exhibit behavior beyond the sum of its individual parts. In particular, the report highlights how the (in)applicability of hydrodynamics and other effective theories can be probed across three principal frontiers: the size frontier, the equilibrium frontier, and the interaction frontier.</p></div>","PeriodicalId":786,"journal":{"name":"The European Physical Journal A","volume":"62 6","pages":""},"PeriodicalIF":2.8,"publicationDate":"2026-06-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1140/epja/s10050-026-01843-2.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148237272","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":"Evolution of the nuclear structure in neutron-rich Cu isotopes: first spectroscopy of odd-odd (^{74})Cu and (^{76})Cu","authors":"L. G. Pedersen,&nbsp;E. Sahin,&nbsp;A. Görgen,&nbsp;F. L. Bello Garrote,&nbsp;Y. Tsunoda,&nbsp;T. Otsuka,&nbsp;M. Niikura,&nbsp;S. Nishimura,&nbsp;Z. Xu,&nbsp;H. Baba,&nbsp;G. Benzoni,&nbsp;F. Browne,&nbsp;A. M. Bruce,&nbsp;S. Ceruti,&nbsp;F. C. L. Crespi,&nbsp;R. Daido,&nbsp;G. de Angelis,&nbsp;M. C. Delattre,&nbsp;Zs. Dombradi,&nbsp;P. Doornenbal,&nbsp;Y. Fang,&nbsp;S. Franchoo,&nbsp;G. Gey,&nbsp;A. Gottardo,&nbsp;T. Isobe,&nbsp;P. R. John,&nbsp;H. S. Jung,&nbsp;I. Kojouharov,&nbsp;T. Kubo,&nbsp;N. Kurz,&nbsp;I. Kuti,&nbsp;Z. Li,&nbsp;G. Lorusso,&nbsp;I. Matea,&nbsp;K. Matsui,&nbsp;D. Mengoni,&nbsp;T. Miyazaki,&nbsp;V. Modamio,&nbsp;S. Momiyama,&nbsp;A. I. Morales,&nbsp;P. Morfouace,&nbsp;D. R. Napoli,&nbsp;F. Naqvi,&nbsp;H. Nishibata,&nbsp;A. Odahara,&nbsp;R. Orlandi,&nbsp;Z. Patel,&nbsp;S. Rice,&nbsp;H. Sakurai,&nbsp;H. Schaffner,&nbsp;L. Sinclair,&nbsp;P.-A. Söderström,&nbsp;D. Sohler,&nbsp;I. G. Stefan,&nbsp;T. Sumikama,&nbsp;D. Suzuki,&nbsp;R. Taniuchi,&nbsp;J. Taprogge,&nbsp;Z. Vajta,&nbsp;J. J. Valiente Dobón,&nbsp;H. Watanabe,&nbsp;V. Werner,&nbsp;J. Wu,&nbsp;A. Yagi,&nbsp;M. Yalcinkaya,&nbsp;R. Yokoyama,&nbsp;K. Yoshinaga","doi":"10.1140/epja/s10050-026-01873-w","DOIUrl":"10.1140/epja/s10050-026-01873-w","url":null,"abstract":"<div><p>Excited states in the odd-odd isotopes <span>(^{74})</span>Cu and <span>(^{76})</span>Cu were observed for the first time in a spectroscopic study following the <span>(beta )</span> decay of <span>(^{74})</span>Ni and <span>(^{76})</span>Ni. The experiment was performed at the Radioactive Isotope Beam Factory at RIKEN Nishina Center using the EURICA setup and the BigRIPS separator. Level schemes were constructed based on the analysis of <span>(gamma )</span>-<span>(gamma )</span> coincidences. The time correlations between <span>(beta )</span> and <span>(gamma )</span> decay showed no evidence for population of isomeric states in either nucleus. The experimental results are compared to large-scale Monte Carlo shell-model calculations with the A3DA-m interaction. The low-lying states in <span>(^{74})</span>Cu and <span>(^{76})</span>Cu are interpreted as spin multiplets arising from the coupling of an odd proton in the <span>(2p_{3/2})</span> or <span>(1f_{5/2})</span> orbital with an odd neutron in the <span>(1g_{9/2})</span> or <span>(2p_{1/2})</span> orbital. The results provide information on the evolution of single-particle orbitals along the chain of neutron-rich Cu isotopes and on the proton-neutron interaction in the vicinity of <span>(^{78})</span>Ni, which serve as important benchmarks for shell-model calculations. The non-observation of the low-energy isomeric state at 65 keV in <span>(^{76})</span>Cu, combined with the observed decay pattern from higher-lying states, strongly supports a spin-parity assignment of <span>(3^{(-)})</span> for the ground state and (<span>(6^{-})</span>) for the isomeric state, resolving a long-standing ambiguity discussed in previous studies.</p></div>","PeriodicalId":786,"journal":{"name":"The European Physical Journal A","volume":"62 6","pages":""},"PeriodicalIF":2.8,"publicationDate":"2026-06-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1140/epja/s10050-026-01873-w.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148236564","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":"Model bias and parameter optimisation with the example of the combination of nuclear models INCL and ABLA","authors":"J. Hirtz,&nbsp;J.-C. David,&nbsp;I. Leya,&nbsp;J. L. Rodríguez-Sánchez,&nbsp;G. Schnabel","doi":"10.1140/epja/s10050-026-01881-w","DOIUrl":"10.1140/epja/s10050-026-01881-w","url":null,"abstract":"<div><p>The accuracy and precision of high-energy spallation models play a crucial role in the design and development of new applications and experiments, as well as in data analysis. We discuss the complementarity between parameter optimisation and model bias estimation approaches within a Bayesian framework. This is illustrated using the IntraNuclear Cascade model of Liège (INCL) together with the Ablation model (ABLA), for which these two approaches for model bias estimation have been applied independently in previous works.</p></div>","PeriodicalId":786,"journal":{"name":"The European Physical Journal A","volume":"62 6","pages":""},"PeriodicalIF":2.8,"publicationDate":"2026-06-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1140/epja/s10050-026-01881-w.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148236529","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":"Probability distribution of observables from a Bogoliubov vacuum projected onto good particle number: application to scission configurations of an actinide","authors":"Alice Bernard,&nbsp;David Regnier,&nbsp;Junah Newsome,&nbsp;Paul Carpentier,&nbsp;Noël Dubray,&nbsp;Nathalie Pillet","doi":"10.1140/epja/s10050-026-01878-5","DOIUrl":"10.1140/epja/s10050-026-01878-5","url":null,"abstract":"<div><p>Nuclear fission dynamics described within nuclear energy density functional frameworks (EDF) have seen substantial advances in the last decade. Part of this success stems from projection techniques, which allow the computation of probability distribution functions (pdf) for selected observables such as particle number and angular momentum of the fragments. Predicting the pdf of other observables, such as the total kinetic energy of the fragments, remains undone. This work proposes a method to determine the complete pdf of a new category of observables from a Bogoliubov vacuum projected onto good particle number. It relies on sampling nucleonic configurations in coordinate and intrinsic-spin representation. We assess the feasibility and convergence properties of the method and apply it to states representative of the scission of an actinide. Fluctuations in fragment shapes, inter-fragment Coulomb and nuclear interaction as well as the corresponding torques are analyzed. We find that a significant fraction of the fluctuation of several measured fission observables is already present within the mean-field picture.</p></div>","PeriodicalId":786,"journal":{"name":"The European Physical Journal A","volume":"62 6","pages":""},"PeriodicalIF":2.8,"publicationDate":"2026-06-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1140/epja/s10050-026-01878-5.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148172986","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":"Systematic study of deformation dependence in nuclear charge radii by a hybrid method combining refined empirical formulas with Bayesian neural networks","authors":"Cai-Xin Yuan,&nbsp;Zhi-Yin Liu,&nbsp;Ying-Chen Mao","doi":"10.1140/epja/s10050-026-01872-x","DOIUrl":"10.1140/epja/s10050-026-01872-x","url":null,"abstract":"<div><p>We update the global compilation of ground-state rms charge radii by adding 48 collinear-laser-spectroscopy measurements reported since 2021, yielding 1061 nuclei with <span>(Zge 8)</span> and <span>(Age 16)</span>. Ten representative empirical formulas are refitted and augmented with a unified multipole-deformation correction using <span>(beta _{lambda })</span>. By contrasting WS<span>(^{*})</span>4, FRDM, and HFB deformation bases, we analyze how higher-order shapes enter charge-radius systematics. The quadrupole component <span>(beta _2)</span> provides the dominant, basis-robust improvement because it captures the leading change of nuclear size with static elongation. Higher-order terms (<span>(beta _3)</span>, <span>(beta _4)</span>, <span>(beta _6)</span>) contribute modestly on average but become essential in regions with strong surface restructuring, where they encode reflection asymmetry and hexadecapole-driven radius stretching. Their impact is strongly basis dependent: macroscopic–microscopic bases (WS<span>(^{*})</span>4/FRDM) supply largely independent geometric information that complements phenomenological baselines, whereas self-consistent HFB deformations already embed microscopic correlations and can become redundant with shell or collectivity terms, distorting fits when forced into simple formulas. To overcome fixed functional forms, we further build hybrid predictors with a Bayesian neural network that learns residuals and quantifies uncertainties, reducing systematic errors and reproducing local structures such as Ca odd–even staggering and the Pb kink, with best testing RMSDs of <span>(sim 1.5times 10^{-2})</span> fm.</p></div>","PeriodicalId":786,"journal":{"name":"The European Physical Journal A","volume":"62 6","pages":""},"PeriodicalIF":2.8,"publicationDate":"2026-06-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148172660","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}