Physics Letters B最新文献

{"title":"Unbound neutron ν0d3/2 strength in 17C and the N=16 shell gap","authors":"J. Lois-Fuentes ,&nbsp;B. Fernández-Domínguez ,&nbsp;F. Delaunay ,&nbsp;X. Pereira-López ,&nbsp;N.A. Orr ,&nbsp;M. Płoszajczak ,&nbsp;N. Michel ,&nbsp;T. Otsuka ,&nbsp;T. Suzuki ,&nbsp;W.N. Catford ,&nbsp;O. Sorlin ,&nbsp;N.L. Achouri ,&nbsp;M. Assié ,&nbsp;S. Bailey ,&nbsp;B. Bastin ,&nbsp;Y. Blumenfeld ,&nbsp;R. Borcea ,&nbsp;M. Caamaño ,&nbsp;L. Caceres ,&nbsp;E. Clément ,&nbsp;C. Wheldon","doi":"10.1016/j.physletb.2025.139600","DOIUrl":"10.1016/j.physletb.2025.139600","url":null,"abstract":"<div><div>Significant continuum strength has been observed to be populated in ¹⁷C produced in the d(¹⁶C,p) reaction at a beam energy of 17.2 MeV/nucleon. The strength appears at greater than ∼2 MeV above the single-neutron decay threshold and has been identified as arising from transfer into the neutron <span><math><mn>0</mn><msub><mrow><mi>d</mi></mrow><mrow><mn>3</mn><mo>/</mo><mn>2</mn></mrow></msub></math></span> orbital. Guided by shell model predictions the greater majority of the strength is associated with a 3/2⁺ state at an excitation energy of 4.40<span><math><msubsup><mrow></mrow><mrow><mo>−</mo><mn>0.14</mn></mrow><mrow><mo>+</mo><mn>0.33</mn></mrow></msubsup></math></span> MeV and a much weaker 3/2⁺ level at 5.60<span><math><msubsup><mrow></mrow><mrow><mo>−</mo><mn>0.45</mn></mrow><mrow><mo>+</mo><mn>1.35</mn></mrow></msubsup></math></span> MeV. The corresponding total widths were determined to be 3.45<span><math><msubsup><mrow></mrow><mrow><mo>−</mo><mn>0.78</mn></mrow><mrow><mo>+</mo><mn>1.82</mn></mrow></msubsup></math></span> and 1.6<span><math><msubsup><mrow></mrow><mrow><mo>−</mo><mn>1.4</mn></mrow><mrow><mo>+</mo><mn>4.6</mn></mrow></msubsup></math></span> MeV, respectively. From the backward angle proton differential cross sections and the branching ratios for neutron decay to the ¹⁶C(2<span><math><msubsup><mrow></mrow><mrow><mn>1</mn></mrow><mrow><mo>+</mo></mrow></msubsup></math></span>) level, the corresponding spectroscopic factors to the ground state were deduced to be 0.47±10 and &lt;0.09. Shell-model calculations employing the phenomenological SFO-tls interaction as well as Gamow Shell-Model calculations including continuum effects are in reasonable agreement with experiment, although the predicted strength lies at somewhat lower energy. The size of the N=16 shell gap (<span><math><msub><mrow><mi>ε</mi></mrow><mrow><mi>ν</mi><mn>0</mn><msub><mrow><mi>d</mi></mrow><mrow><mn>3</mn><mo>/</mo><mn>2</mn></mrow></msub></mrow></msub><mo>−</mo><msub><mrow><mi>ε</mi></mrow><mrow><mi>ν</mi><mn>1</mn><msub><mrow><mi>s</mi></mrow><mrow><mn>1</mn><mo>/</mo><mn>2</mn></mrow></msub></mrow></msub></math></span>) was estimated to be 5.08<span><math><msubsup><mrow></mrow><mrow><mo>−</mo><mn>0.33</mn></mrow><mrow><mo>+</mo><mn>0.43</mn></mrow></msubsup></math></span> MeV - some 1.3 MeV larger than found in the SFO-tls shell model calculation.</div></div>","PeriodicalId":20162,"journal":{"name":"Physics Letters B","volume":"867 ","pages":"Article 139600"},"PeriodicalIF":4.3,"publicationDate":"2025-05-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144169959","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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":"Towards a first principles light-front Hamiltonian for the nucleon","authors":"Siqi Xu ,&nbsp;Yiping Liu ,&nbsp;Chandan Mondal ,&nbsp;Jiangshan Lan ,&nbsp;Xingbo Zhao ,&nbsp;Yang Li ,&nbsp;James P. Vary ,&nbsp;BLFQ Collaboration","doi":"10.1016/j.physletb.2025.139599","DOIUrl":"10.1016/j.physletb.2025.139599","url":null,"abstract":"<div><div>We solve the nucleon's wave functions from the eigenstates of the light-front quantum chromodynamics Hamiltonian for the first time, using a fully relativistic and nonperturbative approach based on light-front quantization, without an explicit confining potential. These eigenstates are determined for the three-quark, three-quark-gluon, and three-quark-quark-antiquark Fock representations, making them suitable for low-resolution probes. From this, we calculate the nucleon's quark and gluon matter densities, helicity, and transversity distributions, which show qualitative consistency with experimental extractions. We also compute the contributions of quark and gluon helicity to the proton spin and the tensor charges.</div></div>","PeriodicalId":20162,"journal":{"name":"Physics Letters B","volume":"867 ","pages":"Article 139599"},"PeriodicalIF":4.3,"publicationDate":"2025-05-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144134817","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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":"Competing structures in the beyond neutron N=104 midshell nucleus 184Pb","authors":"J. Ojala ,&nbsp;J. Pakarinen ,&nbsp;R. Wadsworth ,&nbsp;H. Badran ,&nbsp;D.M. Cox ,&nbsp;A.D. Briscoe ,&nbsp;A. Brown ,&nbsp;T. Calverley ,&nbsp;T. Grahn ,&nbsp;P.T. Greenlees ,&nbsp;J. Hilton ,&nbsp;R. Julin ,&nbsp;J. Konki ,&nbsp;R. Llewellyn ,&nbsp;S. Juutinen ,&nbsp;M. Leino ,&nbsp;P. Papadakis ,&nbsp;J. Partanen ,&nbsp;P. Rahkila ,&nbsp;M. Sandzelius ,&nbsp;B. Wallis","doi":"10.1016/j.physletb.2025.139601","DOIUrl":"10.1016/j.physletb.2025.139601","url":null,"abstract":"<div><div>Proton-neutron configurations in atomic nuclei can manifest in a variety of different structures, and exotic nuclei provide fruitful ground for exploring their relation to fundamental symmetries. Here, we report on in-beam <em>γ</em>-ray spectroscopy of the very neutron-deficient ¹⁸⁴Pb nucleus using the <span>jurogam II</span> spectrometer at the <span>ritu</span> separator in a recoil-decay tagging experiment. For the first time, transitions from the non-yrast states have been observed in a Pb nucleus beyond the neutron <span><math><mi>N</mi><mo>=</mo><mn>104</mn></math></span> midshell. In comparison to neighboring Pb isotopes and theoretical models, de-excitation patterns from these states are similar to those associated with predominantly oblate shapes in heavier Pb isotopes. Together with the known predominantly prolate yrast band and the spherical ground state, this suggests that triple-shape coexistence prevails in the ¹⁸⁴Pb nucleus.</div></div>","PeriodicalId":20162,"journal":{"name":"Physics Letters B","volume":"867 ","pages":"Article 139601"},"PeriodicalIF":4.3,"publicationDate":"2025-05-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144134816","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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":"Effect of environment-induced interatomic interaction on entanglement generation for uniformly accelerated atoms with a boundary","authors":"Chenhao Ma,&nbsp;Zixu Zhao","doi":"10.1016/j.physletb.2025.139593","DOIUrl":"10.1016/j.physletb.2025.139593","url":null,"abstract":"<div><div>Considering environment-induced interatomic interaction, we study the entanglement dynamics of two uniformly accelerated atoms that interact with fluctuating massless scalar fields in the Minkowski vacuum in the presence of a reflecting boundary. The two atoms are initially prepared in a state such that one is in the ground state and the other is in the excited state, which is separable. When the acceleration is small, the rate of entanglement generation at the initial time and the maximum of concurrence generated during evolution oscillate with the distance between the atoms and the boundary before reaching a stable value, and may decrease non-monotonically with the acceleration, which means the anti-Unruh phenomenon can exist for some situations even when environmental considerations are taken into account. The results show that there exists the competition of the vacuum fluctuations caused by the boundary and the acceleration. In addition, the time evolution of concurrence will not be affected by the environment-induced interatomic interaction under certain conditions. For a larger acceleration, when the environment-induced interatomic interaction is considered, the concurrence may disappear later compared with the result when the environment-induced interatomic interaction is neglected.</div></div>","PeriodicalId":20162,"journal":{"name":"Physics Letters B","volume":"867 ","pages":"Article 139593"},"PeriodicalIF":4.3,"publicationDate":"2025-05-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144115730","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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":"Energy extraction from rotating black hole with quintessential energy through the Penrose process","authors":"K.Q. Abbasi ,&nbsp;F.L. Carneiro ,&nbsp;M.Z.A. Moughal","doi":"10.1016/j.physletb.2025.139592","DOIUrl":"10.1016/j.physletb.2025.139592","url":null,"abstract":"<div><div>We investigate the geometry, dynamics, and collision mechanisms in the ergoregion of Kerr-Newman-AdS black hole influenced by quintessential energy. Particle splittings within the ergoregion are analyzed, demonstrating their role in energy extraction via the Penrose process. Increased spin elongates the ergosphere, while higher quintessential parameters expand static limits and distort photon regions. Prograde orbits benefit from reduced energy and angular momentum due to frame-dragging, whereas retrograde orbits require higher energy. Quintessential energy weakens the gravitational pull, shifts stable orbit radii, and enhances orbital chaos, as indicated by Lyapunov exponents. The Penrose process demonstrates efficiencies ranging from 5% to 35%, with peak efficiency achieved at high spin, but diminishing with increased charge or quintessential energy due to reduced frame-dragging. We derive the expression for irreducible mass and discuss its dependence on cosmological and quintessence parameters, revealing their role in limiting extractable energy.</div></div>","PeriodicalId":20162,"journal":{"name":"Physics Letters B","volume":"867 ","pages":"Article 139592"},"PeriodicalIF":4.3,"publicationDate":"2025-05-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144134815","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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":"On refined Vogel's universality","authors":"Liudmila Bishler ,&nbsp;Andrei Mironov","doi":"10.1016/j.physletb.2025.139596","DOIUrl":"10.1016/j.physletb.2025.139596","url":null,"abstract":"<div><div>In accordance with P. Vogel, a set of algebra structures in Chern-Simons theory can be made universal, independent of a particular family of simple Lie algebras. In particular, this means that various quantities in the adjoint representations of these simple Lie algebras such as dimensions and quantum dimensions, Racah coefficients, etc. are simple rational functions of two parameters on Vogel's plane, giving three lines associated with <em>sl</em>, <span><math><mi>s</mi><mi>o</mi><mo>/</mo><mi>s</mi><mi>p</mi></math></span> and exceptional algebras correspondingly. By analyzing the partition function of refined of Chern-Simons theory, it was suggested earlier that the refinement may preserve the universality for simply laced algebras. Here we support this conjecture by analyzing the Macdonald dimensions, i.e. values of Macdonald polynomials at <span><math><msup><mrow><mi>q</mi></mrow><mrow><mi>ρ</mi></mrow></msup></math></span>, where <em>ρ</em> is the Weyl vector: there is a universality formula that describes these dimensions for the simply laced algebras as a function on the Vogel's plane.</div></div>","PeriodicalId":20162,"journal":{"name":"Physics Letters B","volume":"867 ","pages":"Article 139596"},"PeriodicalIF":4.3,"publicationDate":"2025-05-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144107418","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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":"Kadomtsev-Petviashvili hierarchies with non-formal pseudo-differential operators, non-formal solutions, and a Yang-Mills–like formulation","authors":"Jean-Pierre Magnot ,&nbsp;Enrique G. Reyes","doi":"10.1016/j.physletb.2025.139589","DOIUrl":"10.1016/j.physletb.2025.139589","url":null,"abstract":"<div><div>We start from the classical Kadomtsev-Petviashvili (KP) hierarchy posed on formal pseudo-differential operators, and we produce new hierarchies of non-linear equations in the context of non-formal pseudo-differential operators lying in the Kontsevich and Vishik's odd class. In particular, we show that it is possible to <em>lift</em> the standard KP hierarchy to hierarchies of differential equations for non-formal pseudo-differential operators, and to recover the former starting from the latter. We prove that the corresponding Zakharov-Shabat equations hold in this context, and we express one of our hierarchies as the minimization of a class of Yang-Mills action functionals on a space of pseudo-differential connections whose curvature takes values in the Dixmier ideal. We finish by comparing our Kadomtsev-Petviashvili hierarchies in terms of the kind of solutions that they produce for the KP-II equation.</div></div>","PeriodicalId":20162,"journal":{"name":"Physics Letters B","volume":"867 ","pages":"Article 139589"},"PeriodicalIF":4.3,"publicationDate":"2025-05-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144115729","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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":"Thermodynamic insights into evolving Lorentzian wormholes in f(R,T) gravity","authors":"C.S. Varsha ,&nbsp;L. Sudharani ,&nbsp;N.S. Kavya ,&nbsp;V. Venkatesha","doi":"10.1016/j.physletb.2025.139590","DOIUrl":"10.1016/j.physletb.2025.139590","url":null,"abstract":"<div><div>This study explores the thermodynamic properties of evolving Lorentzian wormholes within the framework of <span><math><mi>f</mi><mo>(</mo><mi>R</mi><mo>,</mo><mi>T</mi><mo>)</mo></math></span> gravity. This modified gravity theory extends general relativity by incorporating the Ricci scalar (<span><math><mi>R</mi></math></span>) and the trace of the energy-momentum tensor (<span><math><mi>T</mi></math></span>). We investigate the thermodynamics of wormholes at their dynamic apparent horizon, deriving expressions for the entropy variation and testing the validity of the generalized second law of thermodynamics (GSL). Employing both the first law of thermodynamics and the area law formalism, which relates entropy to the horizon area, we explore the evolution of entropy and confirm the consistency of thermodynamic principles within this framework. Furthermore, we examine key physical properties such as stability conditions, active gravitational mass, and total gravitational energy. Our findings provide deeper knowledge into wormhole thermodynamics and wormhole physics, particularly within modified gravity models, and contribute to the broader understanding of the thermodynamic behavior of evolving wormhole spacetimes.</div></div>","PeriodicalId":20162,"journal":{"name":"Physics Letters B","volume":"867 ","pages":"Article 139590"},"PeriodicalIF":4.3,"publicationDate":"2025-05-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144107314","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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":"Primordial gravitational waves from spontaneous Lorentz symmetry breaking","authors":"Mohsen Khodadi ,&nbsp;Gaetano Lambiase ,&nbsp;Leonardo Mastrototaro ,&nbsp;Tanmay Kumar Poddar","doi":"10.1016/j.physletb.2025.139597","DOIUrl":"10.1016/j.physletb.2025.139597","url":null,"abstract":"<div><div>We study the effect of Spontaneous Lorentz Symmetry Breaking (SLSB) on Primordial Gravitational Waves (PGWs) generated during inflation. The SLSB is induced by a time-like Bumblebee vector field which is non-minimally coupled to the Ricci tensor in the Friedmann-Lemaître-Robertson-Walker background. The power spectrum and GW amplitude are computed to investigate how Lorentz violation leaves observable imprints. We calculate the GW strain amplitude over frequencies <span><math><mo>(</mo><msup><mrow><mn>10</mn></mrow><mrow><mo>−</mo><mn>10</mn></mrow></msup><mspace></mspace><mrow><mi>Hz</mi></mrow><mo>,</mo><msup><mrow><mn>10</mn></mrow><mrow><mn>4</mn></mrow></msup><mspace></mspace><mrow><mi>Hz</mi></mrow><mo>)</mo></math></span>, for a range of the dimensionless Lorentz-violating parameter, <span><math><mo>−</mo><msup><mrow><mn>10</mn></mrow><mrow><mo>−</mo><mn>3</mn></mrow></msup><mo>≤</mo><mi>l</mi><mo>≤</mo><msup><mrow><mn>10</mn></mrow><mrow><mo>−</mo><mn>4</mn></mrow></msup></math></span>, which essentially comes from a slight sensitivity to the equation of state for dark energy. For positive <em>l</em> values, the amplitude of GW shows a mild suppression compared to the standard cosmological scenario (<span><math><mi>l</mi><mo>=</mo><mn>0</mn></math></span>). This effect could be observable with detectors like SKA, <em>μ</em>-Ares, and BBO. Conversely, negative <em>l</em> values amplify the GW amplitude, enhancing detectability by both SKA, <em>μ</em>-Ares, and BBO, as well as by THEIA and DECIGO. Notably, the GW strain amplitude increases by an order of magnitude as <em>l</em> moves from 0 to <span><math><mo>−</mo><msup><mrow><mn>10</mn></mrow><mrow><mo>−</mo><mn>3</mn></mrow></msup></math></span>, improving prospects for detection in high-sensitivity detectors like THEIA and DECIGO.</div></div>","PeriodicalId":20162,"journal":{"name":"Physics Letters B","volume":"867 ","pages":"Article 139597"},"PeriodicalIF":4.3,"publicationDate":"2025-05-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144107313","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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":"The nucleon properties in finite temperature and density with Gaussian fluctuations","authors":"Peixin Weng ,&nbsp;Bingtao Li ,&nbsp;Yiming Lyu ,&nbsp;Song Shu ,&nbsp;Hui Zhang","doi":"10.1016/j.physletb.2025.139587","DOIUrl":"10.1016/j.physletb.2025.139587","url":null,"abstract":"<div><div>We investigate the properties of nucleons at finite temperature and density using a two-flavor quark meson model with Gaussian fluctuations that extend beyond the mean-field approximation. Our findings suggest that Gaussian fluctuations lead to a non-monotonic behavior of the nucleon mass as a function of temperature and density, which may play an important role in the study of the hadronization process of relativistic heavy-ion collisions. Moreover, we observe an increase in the nucleon radius due to Gaussian fluctuations, suggesting an effective repulsive force akin to the Casimir effect, as observed in the gold-bromobenzene-silica system. This study offers new insights into how temperature, density, and quantum fluctuations affect the structure and properties of nucleons under extreme conditions.</div></div>","PeriodicalId":20162,"journal":{"name":"Physics Letters B","volume":"867 ","pages":"Article 139587"},"PeriodicalIF":4.3,"publicationDate":"2025-05-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144115728","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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}