Few-Body Systems最新文献

{"title":"Low-Energy Dipole Strength in (^8)He","authors":"Francesca Bonaiti,&nbsp;Sonia Bacca","doi":"10.1007/s00601-024-01903-7","DOIUrl":"10.1007/s00601-024-01903-7","url":null,"abstract":"<div><p>In this work, we present new ab initio coupled-cluster calculations of dipole-excited state properties of <span>(^8)</span>He based on the chiral effective field theory interaction 1.8/2.0 (EM). We focus on the dipole polarizability, and compare the results to our previous study [Phys. Rev. C 105, 034313 (2022)] and subsequent theoretical work. With the aim of connecting the presence of low-lying dipole strength to structure properties of <span>(^8)</span>He, we compute the point-neutron radius, finding excellent agreement with available experimental data, and investigate its correlation with the dipole polarizability.</p></div>","PeriodicalId":556,"journal":{"name":"Few-Body Systems","volume":"65 2","pages":""},"PeriodicalIF":1.7,"publicationDate":"2024-05-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s00601-024-01903-7.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140889645","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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":"Universality for Three Bosons with Large, Negative Effective Range: Aspects and Addenda","authors":"Harald W. Grießhammer","doi":"10.1007/s00601-024-01923-3","DOIUrl":"10.1007/s00601-024-01923-3","url":null,"abstract":"<div><p>Resummed-range Effective Field Theory is the consistent non-relativistic Effective Field Theory of point interactions in systems with large two-body scattering length <i>a</i> and an effective range <span>(r_0)</span> large in magnitude but negative. Its leading order is non-perturbative, and its observables depend only on the dimensionless ratio <span>(xi :=2r_0/a)</span> once <span>(|r_0|)</span> is chosen as base unit. This presentation highlights aspects for three identical spinless bosons and adds details to a previous discussion (Griesshammer and van Kolck in Eur Phys J A 59:289, 2023). At leading order, no three-body interaction is needed. A ground state exists only in the range <span>(0.366ldots ge xi ge -8.72ldots )</span>, and excited states display self-similarity and Discrete Scale Invariance, with small corrections for nonzero <span>(r_0)</span>.</p></div>","PeriodicalId":556,"journal":{"name":"Few-Body Systems","volume":"65 2","pages":""},"PeriodicalIF":1.7,"publicationDate":"2024-05-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140889613","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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":"Correction: The Story Around the First 4n Signal","authors":"F. Miguel Marqués","doi":"10.1007/s00601-024-01926-0","DOIUrl":"10.1007/s00601-024-01926-0","url":null,"abstract":"","PeriodicalId":556,"journal":{"name":"Few-Body Systems","volume":"65 2","pages":""},"PeriodicalIF":1.7,"publicationDate":"2024-05-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142409644","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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":"Correction: Discrete Scale Invariance and U(2) Family of Two-Body Contact Interactions in One Dimension","authors":"Satoshi Ohya","doi":"10.1007/s00601-024-01925-1","DOIUrl":"10.1007/s00601-024-01925-1","url":null,"abstract":"","PeriodicalId":556,"journal":{"name":"Few-Body Systems","volume":"65 2","pages":""},"PeriodicalIF":1.7,"publicationDate":"2024-05-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s00601-024-01925-1.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141014939","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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":"(^6{textrm{Li}}) as a Three-Body System in the (p,(^3{textrm{He}})) Reaction at Astrophysical Energies","authors":"Salvatore Simone Perrotta,&nbsp;Jesús Casal,&nbsp;Stefano Burrello,&nbsp;Maria Colonna,&nbsp;José Antonio Lay","doi":"10.1007/s00601-024-01909-1","DOIUrl":"10.1007/s00601-024-01909-1","url":null,"abstract":"<div><p>Several astrophysical processes are governed by the occurrence of nuclear reactions involving light nuclei at energies below the Coulomb barrier. Among other effects, their understanding is challenged by the appearance of clustered structures in the ground-state configuration of some of these nuclei, which may have a significant impact on the reaction cross section. In this contribution, we focus on the <span>(^6{textrm{Li}})</span>(<span>({textrm{p}})</span>, <span>(^3{textrm{He}})</span>)<span>(^4{textrm{He}})</span> reaction, to probe the role of clustered configurations of <span>(^6{textrm{Li}})</span>. In particular, we consider a three-body ab-initio calculation, based on the hyperspherical harmonics (HH) method, of the <span>(^6{textrm{Li}})</span> wave function (WF), together with a more phenomenological three-body model. We observe that the HH WF entails a degree of clustering much larger than obtained from the phenomenological WFs. However, the corresponding reaction cross section, evaluated as a direct two-nucleon transfer in distorted-wave Born approximation, still follows the scaling with the clustering strength already pointed out in a previous work (Perrotta et al. in Phys Rev C 108(4), 044614, 2023, https://doi.org/10.1103/PhysRevC.108.044614) and exhibits an energy trend very similar to that obtained with realistic phenomenological WFs. This opens up interesting perspectives towards constraining the extent of clustering effects in ground state configurations from the comparison to cross-section experimental data.\u0000</p></div>","PeriodicalId":556,"journal":{"name":"Few-Body Systems","volume":"65 2","pages":""},"PeriodicalIF":1.7,"publicationDate":"2024-04-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140812750","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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":"Structure of Resonance States in Three-Alpha Systems","authors":"Souichi Ishikawa","doi":"10.1007/s00601-024-01922-4","DOIUrl":"10.1007/s00601-024-01922-4","url":null,"abstract":"<div><p>Geometrical structures of low-energy states in the <span>({}^{12})</span>C nucleus are investigated using density distributions obtained from three <span>(alpha )</span>-particle wave functions calculated for a set of phenomenological <span>(2alpha )</span>- and <span>(3alpha )</span> potentials by Faddeev technique. Calculated shapes of triangles that three <span>(alpha )</span>-particles form are classified to either an equilateral triangle, an isosceles triangle, or a mixture of these with various sizes, which may characterize the excitation mechanism of the states</p></div>","PeriodicalId":556,"journal":{"name":"Few-Body Systems","volume":"65 2","pages":""},"PeriodicalIF":1.7,"publicationDate":"2024-04-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140831627","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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":"Electron Scattering on (^4)He from Coupled-Cluster Theory","authors":"Joanna E. Sobczyk","doi":"10.1007/s00601-024-01913-5","DOIUrl":"10.1007/s00601-024-01913-5","url":null,"abstract":"<div><p>We present a coupled-cluster calculation for the electron-<span>(^4)</span>He scattering in the region of the quasi-elastic peak. We show the longitudinal and transverse responses separately, and discuss results within two distinct theoretical methods: the Lorentz integral transform and spectral functions. The comparison between them allows to investigate the role of final state interactions, two-body currents and relativistic effects.</p></div>","PeriodicalId":556,"journal":{"name":"Few-Body Systems","volume":"65 2","pages":""},"PeriodicalIF":1.7,"publicationDate":"2024-04-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s00601-024-01913-5.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140658762","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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":"Determination of Nuclear Matter Radii by Means of Microscopic Optical Potentials: The Case of (^{78})Kr","authors":"Matteo Vorabbi,&nbsp;Paolo Finelli,&nbsp;Carlotta Giusti","doi":"10.1007/s00601-024-01919-z","DOIUrl":"10.1007/s00601-024-01919-z","url":null,"abstract":"<div><p>In this work we use microscopic Nucleon–Nucleus Optical Potentials (OP) to analyze elastic scattering data for the differential cross section of the <span>(^{78})</span>Kr (p,p) <span>(^{78})</span>Kr reaction, with the goal of extracting the matter radius and estimating the neutron skin, quantities that are both needed to determine the slope parameter <i>L</i> of the nuclear symmetry energy. Our analysis is performed with the factorized version of the microscopic OP obtained in a previous series of papers within the Watson multiple scattering theory at the first order of the spectator expansion, which is based on the underlying nucleon–nucleon dynamics and is free from phenomenological inputs. Differently from our previous applications, the proton and neutron densities are described with a two-parameter Fermi (2pF) distribution, which makes the extraction of the matter radius easier and allows us to make a meaningful comparison with the original analysis, that was performed with the Glauber model. With standard minimization techniques we performed data analysis and extracted the matter radius and the neutron skin. Our analysis produces a matter radius of <span>(R_m^{mathrm{(rms)}} = 4.12)</span> fm, in good agreement with previous matter radii extracted from <span>(^{76})</span>Kr and <span>(^{80})</span>Kr, and a neutron skin of <span>(Delta R_{np} simeq - 0.1)</span> fm, compatible with a previous analysis. Our factorized microscopic OP, supplied with 2pF densities, is a valuable tool to perform the analysis of the experimental differential cross section and extract information such as matter radius and neutron skin. Without any free parameters it provides a reasonably good description of the experimental differential cross section for scattering angles up to <span>(approx )</span> 40 degrees. Compared to the Glauber model our OP can be applied to a wider range of scattering angles and allows one to probe the nuclear systems in a more internal region.</p></div>","PeriodicalId":556,"journal":{"name":"Few-Body Systems","volume":"65 2","pages":""},"PeriodicalIF":1.7,"publicationDate":"2024-04-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s00601-024-01919-z.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140798316","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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":"Positronium Negative Ion Embedded in Non-ideal Classical Plasmas: Doubly Excited Singlet S States","authors":"Netai Das,&nbsp;Arijit Ghoshal,&nbsp;Yew Kam Ho","doi":"10.1007/s00601-024-01914-4","DOIUrl":"10.1007/s00601-024-01914-4","url":null,"abstract":"<div><p>The effects of the non-ideality (NI) of the classical plasmas on the doubly excited singlet S states in the positronium negative ion (Ps<span>(^-)</span>) are investigated. The organised effect of the plasma is taken care of by means of a pseudopotential which is characterised by the Debye length <i>D</i> and the non-ideality parameter <span>(gamma )</span>. Using an extensive wavefunction within the framework of the stabilization method, it has been possible to identify four doubly excited states (DES) in Ps<span>(^-)</span>. The convergence of the energy and the width of those states are corroborated by increasing the number of terms in the wavefunction. Our present calculation for the plasma-free case reproduces the established results. An inclusive study is made to quantify and qualify the changes experienced by the energies and the widths of those states due to the influence of the NI over a wide range. It is observed that the energy of each DES increases and the width of each DES diminishes due to the effect of the increasing NI of the plasma.\u0000</p></div>","PeriodicalId":556,"journal":{"name":"Few-Body Systems","volume":"65 2","pages":""},"PeriodicalIF":1.7,"publicationDate":"2024-04-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140626110","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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":"Impact of the (hbox {N}^4hbox {LO}) Short-Range Three-Nucleon Force Components on the Nucleon-Deuteron Spin Correlation Coefficients","authors":"Roman Skibiński,&nbsp;Henryk Witała,&nbsp;Jacek Golak","doi":"10.1007/s00601-024-01911-7","DOIUrl":"10.1007/s00601-024-01911-7","url":null,"abstract":"<div><p>The spin correlation coefficients in the neutron-deuteron elastic scattering process at incoming neutron laboratory energies <span>(hbox {E}=10)</span>, 135, 190, and 250 MeV are determined by solving the momentum space three-nucleon (3N) Faddeev equations. The chiral two-nucleon (2N) interaction with momentum-space semi-local (SMS) regularization up to the fifth order of chiral expansion (<span>(hbox {N}^4hbox {LO})</span>), supplemented by the F-waves terms from the sixth order (<span>(hbox {N}^5hbox {LO})</span>), is used. Additionally, the consistent 3N force (3NF) at the third order of chiral expansion, supplemented by the short-range contributions from <span>(hbox {N}^4hbox {LO})</span> is applied. As a results, we give predictions for the complete set of spin correlation coefficients <span>(C_{alpha ,beta })</span>. We find that the effect of the investigated three-nucleon <span>(hbox {N}^4hbox {LO})</span> components amounts up to several dozen percent, depending on reaction energy, scattering angle and type of spin correlation coefficient itself. Our results can serve as a guide for future measurements of the spin correlation coefficients.</p></div>","PeriodicalId":556,"journal":{"name":"Few-Body Systems","volume":"65 2","pages":""},"PeriodicalIF":1.7,"publicationDate":"2024-04-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s00601-024-01911-7.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140576359","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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}