The European Physical Journal A最新文献

{"title":"Impact of correlations on nuclear binding energies","authors":"A. Scalesi,&nbsp;T. Duguet,&nbsp;P. Demol,&nbsp;M. Frosini,&nbsp;V. Somà,&nbsp;A. Tichai","doi":"10.1140/epja/s10050-024-01424-1","DOIUrl":"10.1140/epja/s10050-024-01424-1","url":null,"abstract":"<div><p>A strong effort will be dedicated in the coming years to extend the reach of ab initio nuclear-structure calculations to heavy doubly open-shell nuclei. In order to do so, the most efficient strategies to incorporate dominant many-body correlations at play in such nuclei must be identified. With this motivation in mind, the present work analyses the step-by-step inclusion of many-body correlations and their impact on binding energies of Calcium and Chromium isotopes. Employing an empirically-optimal Hamiltonian built from chiral effective field theory, binding energies along both isotopic chains are studied via a hierarchy of approximations based on polynomially-scaling expansion many-body methods. More specifically, calculations are performed based on (i) the spherical Hartree–Fock–Bogoliubov mean-field approximation plus correlations from second-order Bogoliubov many-body perturbation theory or Bogoliubov coupled cluster with singles and doubles on top of it, along with (ii) the axially-deformed Hartree–Fock–Bogoliubov mean-field approximation plus correlations from second-order Bogoliubov many-body perturbation theory built on it. The corresponding results are compared to experimental data and to those obtained via valence-space in-medium similarity renormalization group calculations at the normal-ordered two-body level that act as a reference in the present study. The spherical mean-field approximation is shown to display specific shortcomings in Ca isotopes that can be understood analytically and that are efficiently corrected via the consistent addition of low-order dynamical correlations on top of it. While the same setting cannot appropriately reproduce binding energies in doubly open-shell Cr isotopes, allowing the unperturbed mean-field state to break rotational symmetry permits to efficiently capture the static correlations responsible for the phenomenological differences observed between the two isotopic chains. Eventually, the present work demonstrates that polynomially-scaling expansion methods based on unperturbed states that possibly break (and restore) symmetries constitute an optimal route to extend ab initio calculations to heavy closed- and open-shell nuclei.</p></div>","PeriodicalId":786,"journal":{"name":"The European Physical Journal A","volume":"60 10","pages":""},"PeriodicalIF":2.6,"publicationDate":"2024-10-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1140/epja/s10050-024-01424-1.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142453019","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":"Pion-production cross sections in neutrino reactions for studying generalized parton distributions of the nucleon","authors":"Xurong Chen,&nbsp;S. Kumano,&nbsp;R. Kunitomo,&nbsp;Siyu Wu,&nbsp;Ya-Ping Xie","doi":"10.1140/epja/s10050-024-01425-0","DOIUrl":"10.1140/epja/s10050-024-01425-0","url":null,"abstract":"<div><p>Spacelike and timelike generalized parton distributions (GPDs) have been investigated at charged-lepton accelerator facilities, for example, by the virtual Compton scattering and the two-photon process, respectively. In this work, we show the <span>(pi ^pm )</span> and <span>(pi ^0)</span> production cross sections in neutrino (antineutrino) reactions <span>(nu ,(bar{nu }) + N rightarrow ell + pi + N')</span> for studying the GPDs of the nucleon by using the theoretical formalism of Pire, Szymanowski, and Wagner. The <span>(pi ^pm )</span>-production cross sections are useful for finding mainly gluon GPDs, whereas the <span>(pi ^0)</span> production probes quark GPDs, although there are sizable quark-gluon interference terms in the <span>(pi ^pm )</span> production. In particular, we show the roles of the pion- and rho-pole terms, the contribution from each GPD term (<i>H</i>, <i>E</i>, <span>({tilde{H}})</span>, <span>({tilde{E}})</span>), the effects of the gluon GPDs <span>(H_g)</span> and <span>(E_g)</span>, and the dependence on the energy of the process in the neutrino cross sections. These cross sections could be measured at Fermilab in future. The neutrino GPD studies will play a complementary role to the projects of charged-lepton and hadron reactions for determining the accurate GPDs.</p></div>","PeriodicalId":786,"journal":{"name":"The European Physical Journal A","volume":"60 10","pages":""},"PeriodicalIF":2.6,"publicationDate":"2024-10-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142447412","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":"Dynamics of identified particles production in oxygen–oxygen collisions at (sqrt{s_{textrm{NN}}}=7) TeV using EPOS4","authors":"A. M. Khan,&nbsp;M. U. Ashraf,&nbsp;H. M. Alfanda,&nbsp;M. Uzair Aslam","doi":"10.1140/epja/s10050-024-01419-y","DOIUrl":"10.1140/epja/s10050-024-01419-y","url":null,"abstract":"<div><p>The Large Hadron Collider (LHC) aims to inject oxygen (¹⁶<i>O</i>) ions in the next run into its experiments. This include the anticipated one-day physics run focusing on <span>({O+O},)</span>collisions at center-of-mass energy <span>(sqrt{s_{textrm{NN}}}=7)</span> TeV . In this study, we have used recently developed version of the EPOS (EPOS4) to study the production of identified particles (<span>(pi ^pm )</span>, <span>(K^pm )</span> and <span>(p({overline{p}}))</span>) in <span>({O+O},)</span>collisions at <span>(sqrt{s_{textrm{NN}}}=7)</span> TeV . Predictions of transverse momentum (<span>({p_{textrm{T}}},)</span>) spectra, <span>({langle p_{textrm{T}} rangle },)</span>, integrated yield (<span>({{mathrm d}N{/}{mathrm d}{textit{y}}},)</span>) for different centrality classes are studied. To provide insight into the collective nature of the produced particles, we look into the <span>({p_{textrm{T}}},)</span>-differential particle ratios (<span>(K/pi )</span> and <span>(p/pi )</span>) and <span>({p_{textrm{T}}},)</span>-integrated particle ratios to (<span>(pi ^++pi ^-)</span>) as a function of charge particle multiplicity. The shape of the charge particle multiplicity (<span>({textrm{d}N_textrm{ch}/textrm{d}eta },)</span>) and mean transverse momentum (<span>({langle p_{textrm{T}} rangle },)</span>) is well described by EPOS4. The predictions for the ratios of <span>(K/pi )</span> and <span>(p/pi )</span> from EPOS4 exhibit a systematic overestimation compared to the trends observed in <span>({p+p},)</span>, <span>({p+Pb},)</span>and <span>({Pb+Pb},)</span>systems as a function of charged-particle multiplicity. Interestingly, the <span>({O+O},)</span>results of <span>({p_{textrm{T}}},)</span>-integrated particle ratios shows a clear final state multiplicity overlap with <span>({p+p},)</span>, <span>({p+Pb},)</span>and <span>({Pb+Pb},)</span>collisions. EPOS4 does not only mimics signs of collectivity, but embeds collective expansion by construction, since it relies on relativistic hydrodynamics to model the evolution of the so-called core and is one of the suitable candidates to study ultra-relativistic heavy-ion collisions. Furthermore, the foreseen data from <span>({O+O},)</span>collisions at the LHC, when available, will help to better understand the heavy-ion-like behavior in small systems as well as help to put possible constraints on the model parameters.</p></div>","PeriodicalId":786,"journal":{"name":"The European Physical Journal A","volume":"60 10","pages":""},"PeriodicalIF":2.6,"publicationDate":"2024-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142438846","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":"Reflections on the science and impact of Bent Herskind","authors":"S. Leoni,&nbsp;A. Maj,&nbsp;M. A. Riley,&nbsp;J. Simpson,&nbsp;E. Vigezzi,&nbsp;J. N. Wilson","doi":"10.1140/epja/s10050-024-01401-8","DOIUrl":"10.1140/epja/s10050-024-01401-8","url":null,"abstract":"<div><p>Bent Herskind was a <i>Gamma-Ray Grand Master</i>, who helped trigger the modern revolution in <span>(gamma )</span>-ray spectroscopy, opening the door to new vistas in nuclear structure physics. His story is a remarkable one and the contributions he made to the field in terms of its scientific richness and to the development of ever more powerful detector systems, were unique. The enthusiasm and excitement he put into everything were infectious and the brilliance of his insights was compelling. His legacy will live on, not only in the significant discoveries that he made, but also in the way he instilled his deep commitment to unravelling nature’s secrets in this quest and the pleasure of physics discovery with his close collaborators. This review article summarises his career and highlights some of his scientific achievements in which the authors had the privilege to collaborate with him.</p></div>","PeriodicalId":786,"journal":{"name":"The European Physical Journal A","volume":"60 10","pages":""},"PeriodicalIF":2.6,"publicationDate":"2024-10-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1140/epja/s10050-024-01401-8.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142434768","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":"Parton distribution functions and fragmentation functions of spin-1 hadrons","authors":"S. Kumano","doi":"10.1140/epja/s10050-024-01411-6","DOIUrl":"10.1140/epja/s10050-024-01411-6","url":null,"abstract":"<div><p>Structure functions of the spin-1 deuteron will be investigated experimentally from the late 2020’s at various facilities such as Thomas Jefferson National Accelerator Facility, Fermi National Accelerator Laboratory, nuclotron-based ion collider facility, and electron-ion colliders. We expect that a new high-energy spin-physics field could be created by these projects. In this paper, the current theoretical status is explained for the structure functions of spin-1 hadrons, especially on parton distribution functions, transverse-momentum dependent parton distributions, and fragmentation functions. Related multiparton distribution functions are also shown.</p></div>","PeriodicalId":786,"journal":{"name":"The European Physical Journal A","volume":"60 10","pages":""},"PeriodicalIF":2.6,"publicationDate":"2024-10-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142411241","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":"Masses of transuranium nuclides measured with the PI-ICR technique at TRIGA-Trap","authors":"S. Chenmarev,&nbsp;K. Blaum,&nbsp;M. Block,&nbsp;R. B. Cakirli,&nbsp;Ch. E. Düllmann,&nbsp;M. J. Gutiérrez,&nbsp;Sz. Nagy,&nbsp;D. Renisch","doi":"10.1140/epja/s10050-024-01414-3","DOIUrl":"10.1140/epja/s10050-024-01414-3","url":null,"abstract":"<div><p>We have revisited the region of the actinides in the vicinity of the neutron number <i>N</i>=152 and conducted high-precision mass measurements using the newly implemented Phase-Imaging Ion-Cyclotron-Resonance (PI-ICR) technique. The masses of <span>(^{244})</span>Pu and <span>(^{249})</span>Cf were found to deviate by 5.4 and 2.9 combined sigmas, respectively, from our previous results published in 2014. This indicates the presence of systematic errors in the earlier measurements. Consequently, we decided to remeasure all the nuclides from our 2014 study, along with <span>(^{248})</span>Cm, to ensure accuracy and reliability. With our greatly improved apparatus, we have measured the masses of <span>(^{244})</span>Pu, <span>(^{241})</span>Am, <span>(^{243})</span>Am, <span>(^{248})</span>Cm, and <span>(^{249})</span>Cf, using <span>(^{208})</span>Pb and <span>(^{238})</span>U as mass references. The masses of these reference ions were recently determined with ultra-high precision at <span>Pentatrap</span>. Our results were implemented in the latest Atomic Mass Evaluation (AME), showing good consistency. The region related to the masses measured in this study, especially for isotopes near the <i>N</i>=152 deformed shell gap, is discussed in terms of two-neutron separation energies, first excited 2<span>(^+)</span> energy levels and their differentials, as well as <span>(delta V_{pn})</span> values, the average proton-neutron interaction of the most loosely bound two nucleons.</p></div>","PeriodicalId":786,"journal":{"name":"The European Physical Journal A","volume":"60 10","pages":""},"PeriodicalIF":2.6,"publicationDate":"2024-10-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1140/epja/s10050-024-01414-3.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142411237","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":"Measurement of cross section of proton-induced reactions on oxygen with silicon dioxide target","authors":"Joanna Matulewicz,&nbsp;Izabela Skwira-Chalot,&nbsp;Sebastian Kusyk,&nbsp;Tomasz Matulewicz,&nbsp;Przemyslaw Sȩkowski,&nbsp;Adam Spyra,&nbsp;Jan Swakoń,&nbsp;Wiktoria Szcześniak,&nbsp;Agata Taranienko,&nbsp;Damian Wróbel","doi":"10.1140/epja/s10050-024-01420-5","DOIUrl":"10.1140/epja/s10050-024-01420-5","url":null,"abstract":"<div><p>Oxygen is one of the most common elements in the human body. Proton beams used in therapy induce nuclear reactions that cause a loss of fluence along the beam path. These reactions often lead to production of <span>(beta ^+)</span> emitters with relatively short half-lives (less than 20 min). Cross sections for reactions on oxygen are not sufficiently known, particularly at proton energies above few tens of MeV. This contribution presents the results of an experiment, where silicon dioxide targets were used to study nuclear reactions induced by protons with energy below 60 MeV on oxygen. The proton beam was delivered by the AIC-144 cyclotron of the Institute of Nuclear Physics in Kraków. Cross sections of reactions leading to production of <span>( ^{11})</span>C, <span>( ^{13})</span>N and <span>( ^{15})</span>O were obtained. They agree well with the measurements using Cherenkov radiation in bulk SiO<span>(_2)</span>. The recent measurements performed with a PET scanner provided similar results, except in the case of <span>( ^{16})</span>O(p,x)<span>( ^{11})</span>C reaction studied in the energy of up to 200 MeV, where our results are 30% lower.</p></div>","PeriodicalId":786,"journal":{"name":"The European Physical Journal A","volume":"60 10","pages":""},"PeriodicalIF":2.6,"publicationDate":"2024-10-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1140/epja/s10050-024-01420-5.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142410935","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":"A study of the fine-structure constant dependence of radiative capture in Halo-EFT","authors":"Ulf-G. Meißner,&nbsp;Bernard Ch. Metsch,&nbsp;Helen Meyer","doi":"10.1140/epja/s10050-024-01408-1","DOIUrl":"10.1140/epja/s10050-024-01408-1","url":null,"abstract":"<div><p>We study the fine structure constant dependence of the rates of some selected radiative capture reactions within the framework of so-called Halo Effective Field Theory in order to assess the adequacy of some assumptions made on the Coulomb penetrability. We find that this dependence deviates from that implied by a parameterization of the cross sections of this effect via a simple penetration factor. Some features of this fine-structure dependence are discussed, in particular its potential impact on the abundances of the light elements in primordial nucleosynthesis.</p></div>","PeriodicalId":786,"journal":{"name":"The European Physical Journal A","volume":"60 10","pages":""},"PeriodicalIF":2.6,"publicationDate":"2024-10-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11458678/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142397005","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":"Investigating fusion–fission and quasifission in reaction populating (^{188})Pt compound nucleus","authors":"Vikas,&nbsp; Kavita,&nbsp;T. K. Ghosh,&nbsp;K. S. Golda,&nbsp;A. Jhingan,&nbsp;P. Sugathan,&nbsp;A. Chatterjee,&nbsp; Mohit,&nbsp;Abhishek Yadav,&nbsp;C. Yadav,&nbsp;N. Saneesh,&nbsp;B. R. Behera,&nbsp;Ashok Kumar,&nbsp;Kavita Rani,&nbsp;S. Appannababu,&nbsp;Ranjeet Dalal,&nbsp;Meenu Thakur,&nbsp;Rakesh Dubey,&nbsp;S. K. Duggi,&nbsp;Neeraj Kumar,&nbsp;A. Banerjee,&nbsp;A. Rani,&nbsp;Rakesh Kumar,&nbsp; Kajal,&nbsp;Shoaib Noor,&nbsp;Jaimin Acharya,&nbsp;Hardev Singh","doi":"10.1140/epja/s10050-024-01416-1","DOIUrl":"10.1140/epja/s10050-024-01416-1","url":null,"abstract":"<div><p>Fission dynamics of <span>(^{188})</span>Pt, a neutron deficient nucleus in newly discovered mass asymmetric sub-Pb region, have been explored via fission fragments mass-angle and mass-total kinetic energy distributions, at energies around and above the barrier. The observed correlations of fragment mass and emission angle indicate the presence of fission events originating from a non-equilibrated source. Mass-total kinetic energy spectra are relatively broader and the dependence of measured mean total-kinetic-energy on fragment mass is also broader than the expected parabolic dependence for liquid drop fission behaviour, at all studied energies. The measured mean total kinetic energy values are higher than the prediction of Viola systematics. The widths of measured total kinetic energy distributions are also inconsistent with the observed systematic behaviour of compound nucleus (CN) in this mass region. These observation of mass-angle and mass-total kinetic energy distributions revealed the clear signatures of the presence of slow quasifission in the fission of <span>(^{188})</span>Pt compound nucleus. These findings indicate the role of entrance channel parameters such as mass asymmetry and charge product <span>(hbox {Z}_{P})</span> <span>(hbox {Z}_{T})</span> in Fusion-Fission and quasi-fission dynamics. Dynamical model calculations do not predict the presence of quasi-fission for the present reaction system.</p></div>","PeriodicalId":786,"journal":{"name":"The European Physical Journal A","volume":"60 10","pages":""},"PeriodicalIF":2.6,"publicationDate":"2024-10-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142410424","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":"Tagged deep inelastic scattering measurement on deuterium with the LAD experiment","authors":"F. Hauenstein,&nbsp;C. Ayerbe Gayoso,&nbsp;S. Ratliff,&nbsp;H. Szumila-Vance,&nbsp;A. Schmidt,&nbsp;L. Ehinger,&nbsp;O. Hen,&nbsp;D. Higinbotham,&nbsp;I. Korover,&nbsp;T. Kutz,&nbsp;D. Nguyen,&nbsp;E. Piasetzky,&nbsp;L. B. Weinstein","doi":"10.1140/epja/s10050-024-01356-w","DOIUrl":"10.1140/epja/s10050-024-01356-w","url":null,"abstract":"<div><p>The origin of the modification of the quark structure of nucleons in the nuclear medium can be tested with tagged recoil nucleon measurements from deep inelastic scattering off electrons on deuterium. The LAD experiment at the Thomas Jefferson National Laboratory (JLab) will measure the modification of the neutron structure function for high-momentum, highly-virtual neutrons by measuring the spectator recoil protons in coincidence with the scattered electron. An update on the experimental setup and projected results is presented. The experiment will collect data in Fall 2024.</p></div>","PeriodicalId":786,"journal":{"name":"The European Physical Journal A","volume":"60 10","pages":""},"PeriodicalIF":2.6,"publicationDate":"2024-10-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142410388","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}