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Generalized parton distributions for low-lying octet baryons with non-zero skewness 具有非零偏度的低洼八元重子的广义部分子分布
IF 2.6 3区 物理与天体物理
The European Physical Journal A Pub Date : 2025-04-29 DOI: 10.1140/epja/s10050-025-01565-x
Navpreet Kaur, Harleen Dahiya
{"title":"Generalized parton distributions for low-lying octet baryons with non-zero skewness","authors":"Navpreet Kaur,&nbsp;Harleen Dahiya","doi":"10.1140/epja/s10050-025-01565-x","DOIUrl":"10.1140/epja/s10050-025-01565-x","url":null,"abstract":"<div><p>We have performed the structural analysis of low-lying octet baryon members by assuming charge-isospin symmetry among quark flavors in transverse and longitudinal space. Using the light-cone spectator diquark model, we have investigated the electromagnetic form factors of the octet baryons and have compared them with the available data. A comparative analysis of PDFs and generalized parton distributions (GPDs) for non-zero skewness among octet baryons has also been demonstrated. Fourier transform of the deeply virtual Compton scattering amplitude with respect to skewness has been further applied to study the diffraction patterns in the boost-invariant longitudinal position space.</p></div>","PeriodicalId":786,"journal":{"name":"The European Physical Journal A","volume":"61 4","pages":""},"PeriodicalIF":2.6,"publicationDate":"2025-04-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143883587","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}
引用次数: 0
Deciphering spin-parity assignments of nuclear levels 破译核能级的自旋宇称赋值
IF 2.6 3区 物理与天体物理
The European Physical Journal A Pub Date : 2025-04-28 DOI: 10.1140/epja/s10050-025-01569-7
Christian Iliadis
{"title":"Deciphering spin-parity assignments of nuclear levels","authors":"Christian Iliadis","doi":"10.1140/epja/s10050-025-01569-7","DOIUrl":"10.1140/epja/s10050-025-01569-7","url":null,"abstract":"<div><p>Spin-parity assignments of nuclear levels are critical for understanding nuclear structure and reactions. However, inconsistent notation conventions and ambiguous reporting in research papers often lead to confusion and misinterpretations. This paper examines the policies of the Evaluated Nuclear Structure Data File (ENSDF) and the evaluations by Endt and collaborators, highlighting key differences in their approaches to spin-parity notation. Sources of confusion are identified, including ambiguous use of strong and weak arguments and the conflation of new experimental results with prior constraints. Recommendations are provided to improve clarity and consistency in reporting spin-parity assignments, emphasizing the need for explicit notation conventions, clear differentiation of argument strengths, community education, and separate reporting of new findings. These steps aim to enhance the accuracy and utility of nuclear data for both researchers and evaluators.</p></div>","PeriodicalId":786,"journal":{"name":"The European Physical Journal A","volume":"61 4","pages":""},"PeriodicalIF":2.6,"publicationDate":"2025-04-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143883743","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}
引用次数: 0
Machine learning based study of collective quadrupole–octupole excitations 基于机器学习的四极-八极集体激励研究
IF 2.6 3区 物理与天体物理
The European Physical Journal A Pub Date : 2025-04-28 DOI: 10.1140/epja/s10050-025-01564-y
Hadi Sobhani, Yan-An Luo
{"title":"Machine learning based study of collective quadrupole–octupole excitations","authors":"Hadi Sobhani,&nbsp;Yan-An Luo","doi":"10.1140/epja/s10050-025-01564-y","DOIUrl":"10.1140/epja/s10050-025-01564-y","url":null,"abstract":"<div><p>We use the collective quadrupole–octupole model of axial symmetric shapes to study excited states in different Th and Ra isotopes. In this model, we use one of the most commonly used potentials in nuclear physics: Woods–Saxon potential. Extending this model based on the potential suggested is able to describe excited states due to quadrupole–octupole deformations satisfactorily. In this work, the necessary Hamiltonian is diagonalized in suitable bases to yield states of the candidate nuclei. This procedure also necessitates optimization, which is done using machine learning methods for each isotope. The findings and outcomes are carefully examined and contrasted with experimental values.</p></div>","PeriodicalId":786,"journal":{"name":"The European Physical Journal A","volume":"61 4","pages":""},"PeriodicalIF":2.6,"publicationDate":"2025-04-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143883745","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}
引用次数: 0
Effects of energy levels on the double-differential cross sections for (n + ^{13})C reaction below 20 MeV 能级对20 MeV以下(n + ^{13}) C反应双微分截面的影响
IF 2.6 3区 物理与天体物理
The European Physical Journal A Pub Date : 2025-04-28 DOI: 10.1140/epja/s10050-025-01556-y
Fanglei Zou, Xiaojun Sun, Jingshang Zhang, Xiaodong Sun, Xi Tao, Ruirui Xu, Kang Xing, Yongli Jin
{"title":"Effects of energy levels on the double-differential cross sections for (n + ^{13})C reaction below 20 MeV","authors":"Fanglei Zou,&nbsp;Xiaojun Sun,&nbsp;Jingshang Zhang,&nbsp;Xiaodong Sun,&nbsp;Xi Tao,&nbsp;Ruirui Xu,&nbsp;Kang Xing,&nbsp;Yongli Jin","doi":"10.1140/epja/s10050-025-01556-y","DOIUrl":"10.1140/epja/s10050-025-01556-y","url":null,"abstract":"<div><p>The nuclear data of <span>(n + ^{13})</span>C reaction are very important in describing the evolution of nuclear astrophysics, understanding the cluster structure of light nuclei, and producting the radiocarbon. Based on the unified Hauser-Feshbach and exciton model, a statistical theory of light nucleus reaction (STLN) is improved to describe the effects of energy levels on the double-differential cross sections of neutron and charged particles for <span>(n + ^{13})</span>C reaction. The individual contributions of every energy level of the target and different residual nuclei have been analysed. The calculated results agree well with all of the existing experimental double-differential cross sections of outgoing neutron. And the theoretical analysis provides an evidence for the existence of the possible levels of <span>(^{13})</span>C. The results also indicate that the contributions of the direct inelastic scattering derived from DWBA theory and the three-body breakup reaction should be considered. Especially, the contributions of (<i>n</i>, 2<i>n</i>) channel of the 6-th energy level of <span>(^{13})</span>C have been considered. The doubt regarding the significant discrepancies observed near 3-MeV exit energy range for two closely spaced incident energies of 8.09 MeV and 8.24 MeV has been clarified. Furthermore, the total double-differential cross sections of outgoing proton, deuteron, triton, and <span>(alpha )</span> can be self-consistently predicted at arbitrary outgoing angles and incident energies for <span>(n+^{13}text {C})</span> reaction.</p></div>","PeriodicalId":786,"journal":{"name":"The European Physical Journal A","volume":"61 4","pages":""},"PeriodicalIF":2.6,"publicationDate":"2025-04-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143879632","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}
引用次数: 0
Beta-delayed particle emission and collective rotations 延迟粒子发射和集体旋转
IF 2.6 3区 物理与天体物理
The European Physical Journal A Pub Date : 2025-04-28 DOI: 10.1140/epja/s10050-025-01550-4
K. Riisager, E. A. M. Jensen, A. S. Jensen
{"title":"Beta-delayed particle emission and collective rotations","authors":"K. Riisager,&nbsp;E. A. M. Jensen,&nbsp;A. S. Jensen","doi":"10.1140/epja/s10050-025-01550-4","DOIUrl":"10.1140/epja/s10050-025-01550-4","url":null,"abstract":"<div><p>Beta-delayed proton emission in the lower half of the sd-shell will involve deformed nuclei. We derive the normalized matrix element connecting emission of one particle from an initial rotational nuclear state to another final rotating state, and we extract selection rules involving the <i>K</i> quantum number. The initial state is approximated as having a core identical to the final nuclear state. The formalism is then directly applicable to <span>(beta ^+)</span>-delayed proton decays of even-<i>Z</i>, odd-<i>N</i> nuclei or <span>(beta ^-)</span>-delayed neutron decays of odd-<i>Z</i>, even <i>N</i> nuclei. These beta-decay results are compared to the outcomes of possible transfer reactions. As an example the beta-delayed proton emission of <span>(^{21})</span>Mg is considered, where new structure information is obtained and quantum numbers assigned to several states in <span>(^{21})</span>Na.</p></div>","PeriodicalId":786,"journal":{"name":"The European Physical Journal A","volume":"61 4","pages":""},"PeriodicalIF":2.6,"publicationDate":"2025-04-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1140/epja/s10050-025-01550-4.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143879629","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}
引用次数: 0
The (alpha )-nucleus potential: towards a solution of a long-standing problem (alpha ) -核电位：解决一个长期存在的问题
IF 2.6 3区 物理与天体物理
The European Physical Journal A Pub Date : 2025-04-28 DOI: 10.1140/epja/s10050-025-01551-3
P. Mohr, Zs. Fülöp, Gy. Gyürky, Z. Halász, G. G. Kiss, S. R. Kovács, Zs. Mátyus, T. N. Szegedi, T. Szücs
{"title":"The (alpha )-nucleus potential: towards a solution of a long-standing problem","authors":"P. Mohr,&nbsp;Zs. Fülöp,&nbsp;Gy. Gyürky,&nbsp;Z. Halász,&nbsp;G. G. Kiss,&nbsp;S. R. Kovács,&nbsp;Zs. Mátyus,&nbsp;T. N. Szegedi,&nbsp;T. Szücs","doi":"10.1140/epja/s10050-025-01551-3","DOIUrl":"10.1140/epja/s10050-025-01551-3","url":null,"abstract":"<div><p>This study presents an overview over <span>(alpha )</span>-nucleus potentials which are the essential ingredient for the calculation of cross sections and astrophysical reaction rates for <span>(alpha )</span>-induced reactions on intermediate mass and heavy nuclei within the statistical model. Recent experimental data for Mo + <span>(alpha )</span> have been chosen as an example to illustrate the properties of several widely used <span>(alpha )</span>-nucleus potentials. The delicate role of the imaginary part of the potential at large radii is discussed which is the origin of the widely discrepant predictions of the different potentials at low energies far below the Coulomb barrier. The Atomki-V2 potential circumvents the complications with the imaginary part and provides very good predictions for the recent Mo + <span>(alpha )</span> data and also for most other recent reactions and is thus an excellent basis for the calculation of reaction rates. But further improvements are possible, and some ideas in this direction are given in the discussion.</p></div>","PeriodicalId":786,"journal":{"name":"The European Physical Journal A","volume":"61 4","pages":""},"PeriodicalIF":2.6,"publicationDate":"2025-04-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1140/epja/s10050-025-01551-3.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143883744","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}
引用次数: 0
Perturbative quantum Monte Carlo calculation with high-fidelity nuclear forces 具有高保真核力的微扰量子蒙特卡罗计算
IF 2.6 3区 物理与天体物理
The European Physical Journal A Pub Date : 2025-04-26 DOI: 10.1140/epja/s10050-025-01568-8
Jun Liu, Teng Wang, Bing-Nan Lu
{"title":"Perturbative quantum Monte Carlo calculation with high-fidelity nuclear forces","authors":"Jun Liu,&nbsp;Teng Wang,&nbsp;Bing-Nan Lu","doi":"10.1140/epja/s10050-025-01568-8","DOIUrl":"10.1140/epja/s10050-025-01568-8","url":null,"abstract":"<div><p>Quantum Monte Carlo (QMC) is a family of powerful tools for addressing quantum many-body problems. However, its applications are often plagued by the fermionic sign problem. A promising strategy is to simulate an interaction without sign problem as the zeroth order and treat the other pieces as perturbations. According to this scheme, we construct precision nuclear chiral forces on the lattice and make perturbative calculations around a sign-problem-free interaction respecting the Wigner-SU4 symmetry. We employ the recently developed perturbative QMC (ptQMC) method to calculate the perturbative energies up to the second order. This work presents the first ptQMC calculations for two-body next-to-next-to-next-to leading order (<span>(hbox {N}^3)</span>LO) chiral forces and elucidates how the hierarchical nature of the chiral interactions helps organize and simplify the ptQMC calculations. We benchmark the algorithm for the deuteron, where exact solutions serve as rigorous reference points. We also reproduce the famous Tjon line by correlating the perturbative <span>(^{4})</span>He binding energies with the non-perturbative <span>(^{3})</span>H binding energies. These comprehensive demonstrations underscore the efficacy of ptQMC in resolving high-fidelity nuclear interactions, establishing its potential as a robust tool for <i>ab initio</i> nuclear structure studies.</p></div>","PeriodicalId":786,"journal":{"name":"The European Physical Journal A","volume":"61 4","pages":""},"PeriodicalIF":2.6,"publicationDate":"2025-04-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143875406","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}
引用次数: 0
Measuring analyzing powers in the three-body break-up in the dd reaction using neutron detection with plastic scintillators 用塑料闪烁体中子探测测量dd反应中三体破裂的分析能力
IF 2.6 3区 物理与天体物理
The European Physical Journal A Pub Date : 2025-04-25 DOI: 10.1140/epja/s10050-025-01559-9
R. Ramazani-Sharifabadi, M. Mahjour-Shafiei, N. Kalantar-Nayestanaki, J. G. Messchendorp, A. Ramazani-Moghaddam-Arani
{"title":"Measuring analyzing powers in the three-body break-up in the dd reaction using neutron detection with plastic scintillators","authors":"R. Ramazani-Sharifabadi,&nbsp;M. Mahjour-Shafiei,&nbsp;N. Kalantar-Nayestanaki,&nbsp;J. G. Messchendorp,&nbsp;A. Ramazani-Moghaddam-Arani","doi":"10.1140/epja/s10050-025-01559-9","DOIUrl":"10.1140/epja/s10050-025-01559-9","url":null,"abstract":"<div><p>We report on the analysis of analyzing power measurements for coplanar configurations in the three-body breakup of deuteron-deuteron (<i>dd</i>) scattering obtained with a polarized deuteron beam with a kinetic energy of 130 MeV. This analysis includes both the <sup>2</sup><span>(textrm{H}(vec {d},dp){n})</span> and <sup>2</sup><span>(textrm{H}(vec {d},dn){p})</span> processes. To identify the processes of interest, we reconstruct the neutron kinematics from the time-of-flight data provided by the plastic scintillators of <i>B</i>ig-<i>I</i>nstrument for <i>N</i>uclear-Polarization <i>A</i>nalysis (BINA). The timing information is used to determine the neutrons’ positions. Also, time-of-flight data, coupled with the laws of momentum and energy conservation is use5Pd to accurately deduce the energy of the neutrons. Also, particle identification technique is used to identify the <i>dn</i> combination of the <sup>2</sup><span>(textrm{H}(vec {d},dn){p})</span> break-up reaction from the <i>pn</i> combination. Each step is meticulously validated by utilizing the protons from the <sup>2</sup><span>(textrm{H}(vec {d},dp)n)</span> reaction, which are analyzed as if they were neutrons in the <sup>2</sup><span>(textrm{H}(vec {d},dn)p)</span> reaction. The results of the analyzing powers of the <sup>2</sup><span>(textrm{H}(vec {d},dp){n})</span> break-up reaction obtained using the procedure of the neutron-kinematics reconstruction, discussed in this paper, are presented as an overall cross-check and compared with the conventional results presented in Ramazani-Sharifabadi et al. (Eur Phys J A 56:221, 2020). Within the error bars no significant disagreement are observed between the analyzing powers of <sup>2</sup><span>(textrm{H}(vec {d},dp){n})</span> and <sup>2</sup><span>(textrm{H}(vec {d},dn){p})</span> processes which confirms the charge symmetry of nuclear force.</p></div>","PeriodicalId":786,"journal":{"name":"The European Physical Journal A","volume":"61 4","pages":""},"PeriodicalIF":2.6,"publicationDate":"2025-04-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143871317","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}
引用次数: 0
Polarization options in inclusive DIS off tensor polarized deuteron 偏振选项在包容性DIS关闭张量极化氘核
IF 2.6 3区 物理与天体物理
The European Physical Journal A Pub Date : 2025-04-24 DOI: 10.1140/epja/s10050-025-01511-x
Wim Cosyn, Brandon Roldan Tomei, Alan Sosa, Allison Zec
{"title":"Polarization options in inclusive DIS off tensor polarized deuteron","authors":"Wim Cosyn,&nbsp;Brandon Roldan Tomei,&nbsp;Alan Sosa,&nbsp;Allison Zec","doi":"10.1140/epja/s10050-025-01511-x","DOIUrl":"10.1140/epja/s10050-025-01511-x","url":null,"abstract":"<div><p>In the near future, the Jefferson Lab <span>(b_1)</span> experiment will provide the second measurement of tensor polarized asymmetries in inclusive DIS on the deuteron. In this asymmetry, 4 independent tensor polarized structure functions contribute. This necessitates systematic approximations in the extraction of the leading twist structure function <span>(b_1)</span> from a single tensor asymmetry measurement. Contamination from higher twist structure functions and kinematic effects is discussed here. Using a deuteron convolution model, we quantify the systematic errors from these approximations for two different choices for the target polarization direction (momentum transfer, electron beam direction). For Jefferson Lab 12 GeV kinematics, the systematic error turns out to be comparable between the two polarization options, while at higher <span>(Q^2)</span> values the momentum transfer direction is preferred.</p></div>","PeriodicalId":786,"journal":{"name":"The European Physical Journal A","volume":"61 4","pages":""},"PeriodicalIF":2.6,"publicationDate":"2025-04-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143865477","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}
引用次数: 0
History of the concept of nuclear shape 核形状概念的历史
IF 2.6 3区 物理与天体物理
The European Physical Journal A Pub Date : 2025-04-22 DOI: 10.1140/epja/s10050-025-01545-1
David Verney
{"title":"History of the concept of nuclear shape","authors":"David Verney","doi":"10.1140/epja/s10050-025-01545-1","DOIUrl":"10.1140/epja/s10050-025-01545-1","url":null,"abstract":"<div><p>This article provides a comprehensive review of the evolution of the nuclear shape concept, a cornerstone in nuclear physics. Tracing its historical development from the early 20th century, we highlight key milestones and paradigm shifts that have shaped our understanding. The review explores the transition from the initial spherical model to the introduction of nuclear deformation, emphasizing the contributions of the liquid drop model and the unified model. The pivotal role of nuclear shapes in elucidating various nuclear phenomena and their profound impact on both theoretical and experimental nuclear physics are discussed in depth. The article underscores the relevance of nuclear shape in contemporary physics, particularly in light of groundbreaking findings from ultra-relativistic heavy ion collisions. These recent results illustrate the enduring significance of nuclear shape in advancing our comprehension of nuclear structure and reactions.</p></div>","PeriodicalId":786,"journal":{"name":"The European Physical Journal A","volume":"61 4","pages":""},"PeriodicalIF":2.6,"publicationDate":"2025-04-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1140/epja/s10050-025-01545-1.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143861261","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}
引用次数: 0
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