Physics Letters B最新文献_第9页

Hypernuclear cluster states of BΛ12 unveiled through neural network-driven microscopic calculation

IF 4.3 2区物理与天体物理

Physics Letters B Pub Date : 2025-03-01 DOI: 10.1016/j.physletb.2025.139338

Jiaqi Tian , Mengjiao Lyu , Zheng Cheng , Masahiro Isaka , Akinobu Doté , Takayuki Myo , Hisashi Horiuchi , Hiroki Takemoto , Niu Wan , Qing Zhao

{"title":"Hypernuclear cluster states of BΛ12 unveiled through neural network-driven microscopic calculation","authors":"Jiaqi Tian , Mengjiao Lyu , Zheng Cheng , Masahiro Isaka , Akinobu Doté , Takayuki Myo , Hisashi Horiuchi , Hiroki Takemoto , Niu Wan , Qing Zhao","doi":"10.1016/j.physletb.2025.139338","DOIUrl":"10.1016/j.physletb.2025.139338","url":null,"abstract":"<div><div>We investigate the hypernuclear cluster states of <span><math><mmultiscripts><mrow><mi>B</mi></mrow><mprescripts></mprescripts><mrow><mi>Λ</mi></mrow><mrow><mn>12</mn></mrow></mmultiscripts></math></span> using a neural-network-driven microscopic model. We extend the Control Neural Networks (Ctrl.NN) method and systematically calculate the positive-parity spectrum of <span><math><mmultiscripts><mrow><mi>B</mi></mrow><mprescripts></mprescripts><mrow><mi>Λ</mi></mrow><mrow><mn>12</mn></mrow></mmultiscripts></math></span>. By incorporating <em>sd</em>-shell excitations and parity-coupling effects into the <span><math><mmultiscripts><mrow><mi>B</mi></mrow><mprescripts></mprescripts><mrow><mi>Λ</mi></mrow><mrow><mn>12</mn></mrow></mmultiscripts></math></span> hypernuclear system, we reveal structural changes, including clustering effects and new configurations such as isosceles-triangle and <em>α</em>-<em>t</em>-<em>α</em> linear-chain structures. Furthermore, by comparing with experimental data, we identify that many peaks (#6 and #8) can be interpreted as <span><math><msub><mrow><mi>p</mi></mrow><mrow><mi>Λ</mi></mrow></msub></math></span> dominant states, which is consistent with shell-model predictions. Notably, based on our analysis of the excited states of <span><math><mmultiscripts><mrow><mi>B</mi></mrow><mprescripts></mprescripts><mrow><mi>Λ</mi></mrow><mrow><mn>12</mn></mrow></mmultiscripts></math></span>, we propose possible candidates for previously unexplained or controversial experimental peaks.</div></div>","PeriodicalId":20162,"journal":{"name":"Physics Letters B","volume":"862 ","pages":"Article 139338"},"PeriodicalIF":4.3,"publicationDate":"2025-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143509653","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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

Geometrical origin of inflation in Weyl-invariant Einstein-Cartan gravity

IF 4.3 2区物理与天体物理

Physics Letters B Pub Date : 2025-03-01 DOI: 10.1016/j.physletb.2025.139343

Georgios K. Karananas

引用次数: 0

Gravitational wave emission in binary neutron star early post-merger within a dark environment

IF 4.3 2区物理与天体物理

Physics Letters B Pub Date : 2025-03-01 DOI: 10.1016/j.physletb.2025.139358

D. Suárez-Fontanella, D. Barba-González, C. Albertus, M. Ángeles Pérez-García

{"title":"Gravitational wave emission in binary neutron star early post-merger within a dark environment","authors":"D. Suárez-Fontanella, D. Barba-González, C. Albertus, M. Ángeles Pérez-García","doi":"10.1016/j.physletb.2025.139358","DOIUrl":"10.1016/j.physletb.2025.139358","url":null,"abstract":"<div><div>Using an effective Lagrangian model inspired by Takami et al. <span><span>[1]</span></span> we qualitatively study the early post-merger of a nearly symmetric binary Neutron Star (BNS) merger event with a non-vanishing ambient fraction of dark matter. For this we first mimic the dynamics of two oscillating Neutron Star (NS) masses in the gravitational potential well as they merge. We parametrize the dynamics and ejecta properties in the coalescence event allowing the formation of a surrounding debris disk that may be containing a non-vanishing dark matter fraction. In order to analyze the possible novel dark contribution, we start from a dark-matter free modelization as a benchmark. Using Monte Carlo Markov Chain (MCMC) techniques we approximately recover the gravitational waveforms, restricted to early post-merger time interval from existing simulations in the CoRe database. Later, we explore the impact of an additional dark viscous fluid under a prescribed velocity dependent force in the Lagrangian and obtain the resulting waveforms and some spectral features originating in the first few ms in the BNS post-merger. Finally we discuss our qualitative findings and its range of validity in light of the prospects of detectability in present or future experimental settings.</div></div>","PeriodicalId":20162,"journal":{"name":"Physics Letters B","volume":"862 ","pages":"Article 139358"},"PeriodicalIF":4.3,"publicationDate":"2025-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143519506","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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 Weinberg no-go theorem for cosmological constant and nonlocal gravity

IF 4.3 2区物理与天体物理

Physics Letters B Pub Date : 2025-03-01 DOI: 10.1016/j.physletb.2025.139370

Salvatore Capozziello , Anupam Mazumdar , Giuseppe Meluccio

引用次数: 0

Classical dynamics of particles with non-abelian gauge charges

IF 4.3 2区物理与天体物理

Physics Letters B Pub Date : 2025-03-01 DOI: 10.1016/j.physletb.2025.139349

Jan W. van Holten

引用次数: 0

Signals of nonrenormalizable Lorentz and CPT violation at the LHC

IF 4.3 2区物理与天体物理

Physics Letters B Pub Date : 2025-03-01 DOI: 10.1016/j.physletb.2025.139366

Enrico Lunghi , Nathaniel Sherrill

引用次数: 0

Neutron activation as benchmark for cross section evaluations: Demonstration through the MACS of 50Cr for nuclear technology applications

IF 4.3 2区物理与天体物理

Physics Letters B Pub Date : 2025-03-01 DOI: 10.1016/j.physletb.2025.139360

P. Pérez-Maroto , C. Guerrero , B. Fernández , A. Casanovas-Hoste , M.E. Stamati

{"title":"Neutron activation as benchmark for cross section evaluations: Demonstration through the MACS of 50Cr for nuclear technology applications","authors":"P. Pérez-Maroto , C. Guerrero , B. Fernández , A. Casanovas-Hoste , M.E. Stamati","doi":"10.1016/j.physletb.2025.139360","DOIUrl":"10.1016/j.physletb.2025.139360","url":null,"abstract":"<div><div>Neutron cross section libraries often differ with each other due to the limited availability of differential cross section data from time-of-flight experiments. These are indeed challenging, requiring state-of-the-art facilities and detectors, as well as an involved data analysis. However, in some cases, an easier alternative can be found in simpler integral experiments, as it is demonstrated herein. The capture cross section of <sup>50</sup>Cr plays an important role in nuclear reactors and recent criticality safety benchmarks pointed to an increase of 20%, which has been incorporated in the recent INDEN (2023) evaluated library. In this work we have carried out an epithermal neutron activation measurement on <sup>50</sup>Cr at the CNA HiSPANoS facility. The resulting Maxwellian Average Cross Section (MACS) at 30 keV, 37.1(20) mb, provides enough evidence to discard the proposed increase in the cross section. Furthermore, it illustrates the suitability of the activation technique to benchmark cross section evaluations in the epithermal energy region. This can in principle be extended to other reactions (as far as they result in radioactive nuclei) and to the fast neutron range by employing mono-energetic beams from D-D and D-T reactions in similarly simple experiments.</div></div>","PeriodicalId":20162,"journal":{"name":"Physics Letters B","volume":"862 ","pages":"Article 139360"},"PeriodicalIF":4.3,"publicationDate":"2025-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143519023","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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

Determining the duration of the hadronic stage at RHIC-BES energies via resonance suppression using a full set of rate equations

IF 4.3 2区物理与天体物理

Physics Letters B Pub Date : 2025-03-01 DOI: 10.1016/j.physletb.2025.139339

Tim Neidig , Apiwit Kittiratpattana , Tom Reichert , Amine Chabane , Carsten Greiner , Marcus Bleicher

{"title":"Determining the duration of the hadronic stage at RHIC-BES energies via resonance suppression using a full set of rate equations","authors":"Tim Neidig , Apiwit Kittiratpattana , Tom Reichert , Amine Chabane , Carsten Greiner , Marcus Bleicher","doi":"10.1016/j.physletb.2025.139339","DOIUrl":"10.1016/j.physletb.2025.139339","url":null,"abstract":"<div><div>We present realistic estimates for the duration of the hadronic stage in central Au+Au reactions in the RHIC-BES energy regime. To this aim, we employ a full set of coupled rate equations to describe the time evolution of the system from chemical to kinetic freeze-out. Combined with the recently measured data by the STAR collaboration on <span><math><msup><mrow><mi>K</mi></mrow><mrow><mo>⁎</mo></mrow></msup><mo>/</mo><mi>K</mi></math></span> ratios, we show that the previous estimates substantially underestimated the duration of this stage due to the omission of the regeneration of hadron resonances. We provide an improved relation between the <span><math><msup><mrow><mi>K</mi></mrow><mrow><mo>⁎</mo></mrow></msup><mo>/</mo><mi>K</mi></math></span> ratio at chemical and kinetic freeze-out and the life time of the hadronic phase. The calculated improved life times are now in line with estimates from other methods and are relevant for the NA61 and STAR collaborations and for upcoming experiments at the FAIR facility.</div></div>","PeriodicalId":20162,"journal":{"name":"Physics Letters B","volume":"862 ","pages":"Article 139339"},"PeriodicalIF":4.3,"publicationDate":"2025-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143529203","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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

Determination of resonances in Gamow window for 12C+12C fusion reaction via thick-target inverse kinematics method

IF 4.3 2区物理与天体物理

Physics Letters B Pub Date : 2025-03-01 DOI: 10.1016/j.physletb.2025.139341

Weike Nan , Youbao Wang , Jun Su , Yaode Sheng , Richard James deBoer , Yuqiang Zhang , Luyang Song , Fuqiang Cao , Chen Chen , Chao Dong , Yunju Li , Zhihong Li , Gang Lian , Wei Nan , Yangping Shen , Na Song , Shengquan Yan , Seng Zeng , Bing Guo , Weiping Liu

{"title":"Determination of resonances in Gamow window for 12C+12C fusion reaction via thick-target inverse kinematics method","authors":"Weike Nan , Youbao Wang , Jun Su , Yaode Sheng , Richard James deBoer , Yuqiang Zhang , Luyang Song , Fuqiang Cao , Chen Chen , Chao Dong , Yunju Li , Zhihong Li , Gang Lian , Wei Nan , Yangping Shen , Na Song , Shengquan Yan , Seng Zeng , Bing Guo , Weiping Liu","doi":"10.1016/j.physletb.2025.139341","DOIUrl":"10.1016/j.physletb.2025.139341","url":null,"abstract":"<div><div>The <sup>12</sup>C+<sup>12</sup>C fusion reaction at deep subbarrier energies is important for understanding the carbon burning process in massive star and explosive binary systems. However, its reaction rates are very difficult to measure directly or evaluate by simple extrapolation due to the extremely small cross sections and complex resonance structures near the Gamow window. In this work, we use one of its exit channels, <em>i.e.</em> <sup>23</sup>Na+<em>p</em> to populate the excited states of the compound nucleus <sup>24</sup>Mg via the conventional thick-target inverse kinematics method. By applying <em>γ</em>-charged particle coincidence, we have obtained excitation functions for the proton and <em>α</em> emission channels, respectively, and derived the resonance parameters through a simultaneous multi-channel R-matrix analysis. It is clear that a series of discrete resonances exist in the most relevant excitation energy region of <sup>24</sup>Mg. The astrophysical <em>S</em>-factor of the <sup>12</sup>C+<sup>12</sup>C fusion reaction is evaluated by adopting a systematic reduced width for the entrance channel. In particular, branching ratios of the dominant four decay channels are estimated across the entire Gamow window of the <sup>12</sup>C+<sup>12</sup>C fusion reactions. Significant fluctuations are shown that may have strong impacts on the final outcome of the carbon burning process.</div></div>","PeriodicalId":20162,"journal":{"name":"Physics Letters B","volume":"862 ","pages":"Article 139341"},"PeriodicalIF":4.3,"publicationDate":"2025-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143509648","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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

(Quasi-)normal modes of rotating black holes and new solitons in Einstein-Gauss-Bonnet

IF 4.3 2区物理与天体物理

Physics Letters B Pub Date : 2025-03-01 DOI: 10.1016/j.physletb.2025.139347

Lilianne Tapia , Monserrat Aguayo , Andrés Anabalón , Dumitru Astefanesei , Nicolás Grandi , Fernando Izaurieta , Julio Oliva , Cristian Quinzacara

{"title":"(Quasi-)normal modes of rotating black holes and new solitons in Einstein-Gauss-Bonnet","authors":"Lilianne Tapia , Monserrat Aguayo , Andrés Anabalón , Dumitru Astefanesei , Nicolás Grandi , Fernando Izaurieta , Julio Oliva , Cristian Quinzacara","doi":"10.1016/j.physletb.2025.139347","DOIUrl":"10.1016/j.physletb.2025.139347","url":null,"abstract":"<div><div>In this paper, we analyze the scalar field (quasi-)normal modes of recently derived rotating black holes within the framework of Einstein-Gauss-Bonnet theory at the Chern-Simons point in five dimensions. We also examine the mode spectrum of these probes on new static gravitational solitons. These solitons, featuring a regular center, are constructed from static black holes with gravitational hair via a double analytic continuation. By imposing ingoing boundary conditions at the horizons of rotating black holes, ensuring regularity at the soliton centers, and imposing Dirichlet boundary conditions at infinity, we obtain numerical spectra for the rotating black holes and solitons. For static black holes, we demonstrate analytically that the imaginary part of the mode frequencies is negative. Our analysis of the massless Klein-Gordon equation on five-dimensional geometries reveals an infinite family of gapped, massive three-dimensional Klein-Gordon fields, despite the presence of a non-compact extended direction. For the static solitons, the frequencies are real and non-equispaced, whereas in the rotating black holes, counter-rotating modes are absorbed more quickly, and the imaginary part of the co-rotating modes approaches zero as extremality is approached. Additionally, we show that both the rotating black holes and solitons can be equipped with non-trivial torsion, leading to a novel branch of solutions.</div></div>","PeriodicalId":20162,"journal":{"name":"Physics Letters B","volume":"862 ","pages":"Article 139347"},"PeriodicalIF":4.3,"publicationDate":"2025-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143519510","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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