物理最新文献

{"title":"Precise 113Cd (beta ) decay spectral shape measurement and interpretation in terms of possible (g_A) quenching","authors":"I. Bandac,&nbsp;L. Bergé,&nbsp;J. M. Calvo-Mozota,&nbsp;P. Carniti,&nbsp;M. Chapellier,&nbsp;F. A. Danevich,&nbsp;T. Dixon,&nbsp;L. Dumoulin,&nbsp;F. Ferri,&nbsp;A. Giuliani,&nbsp;C. Gotti,&nbsp;Ph. Gras,&nbsp;D. L. Helis,&nbsp;L. Imbert,&nbsp;H. Khalife,&nbsp;V. V. Kobychev,&nbsp;J. Kostensalo,&nbsp;P. Loaiza,&nbsp;P. de Marcillac,&nbsp;S. Marnieros,&nbsp;C. A. Marrache-Kikuchi,&nbsp;M. Martinez,&nbsp;C. Nones,&nbsp;E. Olivieri,&nbsp;A. Ortiz de Solórzano,&nbsp;G. Pessina,&nbsp;D. V. Poda,&nbsp;J. A. Scarpaci,&nbsp;J. Suhonen,&nbsp;V. I. Tretyak,&nbsp;M. Zarytskyy,&nbsp;A. Zolotarova","doi":"10.1140/epjc/s10052-024-13538-3","DOIUrl":"10.1140/epjc/s10052-024-13538-3","url":null,"abstract":"<div><p>Highly forbidden <span>(beta )</span> decays provide a sensitive test to nuclear models in a regime in which the decay goes through high spin-multipole states, similar to the neutrinoless double-<span>(beta )</span> decay process. There are only 3 nuclei (⁵⁰V, ¹¹³Cd, ¹¹⁵In) which undergo a <span>(4^textrm{th})</span> forbidden non-unique <span>(beta )</span> decay. In this work, we compare the experimental ¹¹³Cd spectrum to theoretical spectral shapes in the framework of the spectrum-shape method. We measured with high precision, with the lowest energy threshold and the best energy resolution ever, the <span>(beta )</span> spectrum of ¹¹³Cd embedded in a 0.43 kg <span>(hbox {CdWO}_4)</span> crystal, operated over 26 days as a bolometer at low temperature in the Canfranc underground laboratory (Spain). We performed a Bayesian fit of the experimental data to three nuclear models (IBFM-2, MQPM and NSM) allowing the reconstruction of the spectral shape as well as the half-life. The fit has two free parameters, one of which is the effective weak axial-vector coupling constant, <span>(g_A^{text {eff}})</span>, which resulted in <span>(g_A^{text {eff}})</span> between 1.0 and 1.2, compatible with a possible quenching. Based on the fit, we measured the half-life of the ¹¹³Cd <span>(beta )</span> decay including systematic uncertainties as <span>(7.73^{+0.60}_{-0.57} times 10^{15})</span> yr, in agreement with the previous experiments. These results represent a significant step towards a better understanding of low-energy nuclear processes.</p></div>","PeriodicalId":788,"journal":{"name":"The European Physical Journal C","volume":"84 11","pages":""},"PeriodicalIF":4.2,"publicationDate":"2024-11-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1140/epjc/s10052-024-13538-3.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142645379","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}

{"title":"Erratum: Exact rotating black hole solutions for f(R) gravity by modified Newman Janis algorithm","authors":"Pankaj Chaturvedi,&nbsp;Utkarsh Kumar,&nbsp;Udaykrishna Thattarampilly,&nbsp;Vishnu Kakkat","doi":"10.1140/epjc/s10052-024-13562-3","DOIUrl":"10.1140/epjc/s10052-024-13562-3","url":null,"abstract":"","PeriodicalId":788,"journal":{"name":"The European Physical Journal C","volume":"84 11","pages":""},"PeriodicalIF":4.2,"publicationDate":"2024-11-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1140/epjc/s10052-024-13562-3.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142636771","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}

{"title":"PEDOT:PSS as a conductive polymer binder for ecologically and economically sustainable, carbon-free NMC electrodes","authors":"Michał Grygiel,&nbsp;Maciej Ratyński,&nbsp;Andrzej Czerwiński,&nbsp;Bartosz Hamankiewicz","doi":"10.1007/s00339-024-08039-9","DOIUrl":"10.1007/s00339-024-08039-9","url":null,"abstract":"<div><p>In this work new dispersion medium for positive electrode slurries for lithium-ion batteries, dimethyl sulfoxide (DMSO), is proposed, in combination with PEDOT:PSS conductive polymer as a binder. Dispersion of PEDOT:PSS in concentration of 2.5% w/w with anhydrous DMSO is prepared. The electrodes were prepared with NMC622 active material and prepared PEDOT:PSS/DMSO dispersion with and without addition of conductive carbon. SEM imaging with EDS mapping confirms creation of binding film of the polymer on grains of active material. Chronopotentiometry tests of the electrodes in half-cell lithium-ion setup reveal that the best electrochemical performance was achieved for 97.5% active material and 2.5% PEDOT:PSS without conductive carbon addition (ca. 170 mAh g⁻¹ at 0.1 C, 90% retention after 51 cycles). PEDOT:PSS enabled the elimination of the conductive carbon additive from the electrode and reduction of the binder content. It resulted in enhancement of the capacity per gram of electrode paste by approximately 17% compared with standard electrode composition.</p></div>","PeriodicalId":473,"journal":{"name":"Applied Physics A","volume":"130 12","pages":""},"PeriodicalIF":2.5,"publicationDate":"2024-11-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s00339-024-08039-9.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142645743","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Electroweak metastability and Higgs inflation","authors":"Isabella Masina,&nbsp;Mariano Quiros","doi":"10.1140/epjc/s10052-024-13522-x","DOIUrl":"10.1140/epjc/s10052-024-13522-x","url":null,"abstract":"<div><p>Extrapolating the Standard Model Higgs potential at high energies, we study the barrier between the electroweak and Planck scale minima. The barrier arises by taking the central values of the relevant experimental inputs, that is the strong coupling constant and the top quark and Higgs masses. We then extend the Standard Model by including a non-minimal coupling to gravity, and explore the phenomenology of the Higgs inflation model. We point out that even configurations that would be metastable in the Standard Model, become viable for inflation if the non-minimal coupling is large enough to flatten the Higgs potential at field values below the barrier; we find that the required value of the non-minimal coupling is smaller than the one needed for the conventional Higgs inflation scenario (which relies on a stable Standard Model Higgs potential, without any barrier); in addition, values of the top mass which are larger than those required in the conventional scenario are allowed.</p></div>","PeriodicalId":788,"journal":{"name":"The European Physical Journal C","volume":"84 11","pages":""},"PeriodicalIF":4.2,"publicationDate":"2024-11-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1140/epjc/s10052-024-13522-x.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142645383","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}

{"title":"Structure stability of confined bismuth sesquioxide phases – low-temperature experimental and computational studies","authors":"Maciej Nowagiel,&nbsp;Jerzy E. Garbarczyk,&nbsp;Marek Wasiucionek,&nbsp;Pawel Keblinski,&nbsp;Tomasz K. Pietrzak","doi":"10.1007/s00339-024-07991-w","DOIUrl":"10.1007/s00339-024-07991-w","url":null,"abstract":"<div><p>Several bismuth sesquioxide (Bi<span>(_{2})</span>O<span>(_{3})</span>) phases (namely <span>(upbeta)</span>, <span>(upgamma)</span> and <span>(updelta)</span>-like) were previously stabilized at room temperature by nanocrystallization of bismuthate glasses. Normally, a monoclinic <span>(upalpha)</span> phase is the stable one at ambient conditions in polycrystalline materials. In this work, we wanted to observe if any phase transitions would occur below the room temperature for <span>(upbeta)</span>, <span>(upgamma)</span> and <span>(updelta)</span>-like phases confined in a residual glassy matrix. Observations were made down to 100 K using X-ray diffractometry (XRD) and differential scanning calorimetry (DSC). Both experimental techniques showed no traces of phase transition upon cooling to the temperature limit of our equipment. From XRD studies, the lattice parameter of the δ-like phase was determined. The values were compared to the values calculated by molecular dynamics studies of overcooled <span>(updelta)</span>-Bi<span>(_{2})</span>O<span>(_{3})</span> phase.</p></div>","PeriodicalId":473,"journal":{"name":"Applied Physics A","volume":"130 12","pages":""},"PeriodicalIF":2.5,"publicationDate":"2024-11-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s00339-024-07991-w.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142645742","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Microstructure based fatigue behavior prediction model for AA 7075-T651 Al Alloy with emphasis on the role played by pre-fractured particles in crack initiation","authors":"Zhongwen Zhang,&nbsp;Yan Jin,&nbsp;Haisheng Han,&nbsp;Tongguang Zhai","doi":"10.1007/s00339-024-08058-6","DOIUrl":"10.1007/s00339-024-08058-6","url":null,"abstract":"<div><p>A 3D microstructure-based model was established to quantify the distribution of accumulated plastic strain as a fatigue damage indicator in 7075-T651 alloy, using crystal plasticity finite element method (CPFEM). It was found that the cross-sectional size of pre-fractured particles significantly influences the stress intensity factor at the micro-notch front, as well as the resolved shear stresses (RSS) on the slip systems and the accumulated plastic strain nearby, thereby governing crack initiation. Larger the cross-sectional size of a pre-fractured particle the easier crack initiation at the particle. It also revealed that the larger the Schmid factor of the grain with a pre-fractured particle in surface, the more fatigue damage accumulated, i.e., the easier crack initiation occurred at the particle. However, the grain orientation effect might come second to the effect of the cross-sectional area of the particle on crack initiation.</p></div>","PeriodicalId":473,"journal":{"name":"Applied Physics A","volume":"130 12","pages":""},"PeriodicalIF":2.5,"publicationDate":"2024-11-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142645744","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Effect of Hall current generated by a radial magnetic field on transient natural convection between vertical annuli","authors":"Vijay Kumar Sukariya,&nbsp; Anurag,&nbsp;Atul Jakhar,&nbsp;Anand Kumar","doi":"10.1140/epjp/s13360-024-05786-9","DOIUrl":"10.1140/epjp/s13360-024-05786-9","url":null,"abstract":"<div><p>The Hall effect phenomena has a long standing history, yet its relevance and application continue to grow across numerous industries. Spanning from technological advancements to innovations in medical equipment, the influence of Hall current effects remains critical for enhancing efficiency and driving innovation. Despite its origins over a century ago, the phenomena remains highly relevant and is constantly being integrated into modern systems, reflecting its enduring significance and versatility across both scientific and industrial domains. Building on these historical context, the present study examines the effects of Hall current on transient natural convective flow within cylindrical annuli subjected to a radial magnetic field. The system of partial differential equations derived from the mathematical model is first transformed into a nondimensional form by applying the relevant nondimensional parameters. Subsequently, these nondimensional PDEs are addressed using the implicit Crank–Nicolson finite difference method. Furthermore, the results section offers detailed graphical representations of both primary and secondary velocity profiles, as well as quantities data on temperature and velocities, along with the Nusselt number and skin friction at the cylinder boundaries. These results are systematically presented across a range of flow parameters, providing in-depth analysis of the system’s response to varying conditions. The key outcomes of this study indicate that both the Hall parameter and the radii ratio play a significant role in augmenting the primary and secondary velocities, as well as increasing skin friction values. On the other hand, the Prandtl number and Hartmann number exhibit opposing influences on the primary velocity, each influencing it in a contrasting manner.\u0000</p></div>","PeriodicalId":792,"journal":{"name":"The European Physical Journal Plus","volume":"139 11","pages":""},"PeriodicalIF":2.8,"publicationDate":"2024-11-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142636976","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":"Hadron-ion collisions in Pythia and the vector-meson dominance model for photoproduction","authors":"Ilkka Helenius,&nbsp;Marius Utheim","doi":"10.1140/epjc/s10052-024-13543-6","DOIUrl":"10.1140/epjc/s10052-024-13543-6","url":null,"abstract":"<div><p>We present an extension to the <span>Pythia</span> Monte Carlo event generator that enables simulations of collisions between a generic hadron beam on a nuclear target with energy variation in event-by-event basis. This builds upon <span>Pythia</span> ’s module for heavy ions, <span>Angantyr</span>, as well as previous work on simulating hadron-proton collisions. As such, the extensions in this work are largely technical, except for a rudimentary model for hadronic fluctuations. With hadron-ion simulations, we implement an explicit vector-meson dominance (VMD) model that can be used to simulate interactions of hadronic component of real photons in photo-nuclear collisions. Such processes can be studied in ultra-peripheral heavy-ion collisions and in the future also with the upcoming Electron-Ion Collider. Our work also has applications to hadronic showers, e.g. air showers initiated by high-energy cosmic rays. We first validate the VMD model by comparing to HERA photoproduction data on proton target. Then we apply this to generate events for ultra-peripheral heavy-ion collisions at the LHC and present the results corresponding to the event-selection criteria matching to a recent ATLAS analysis. We find that single-particle multiplicity and rapidity distributions are well in line with the measured ones. We also construct the Fourier coefficients from two-particle correlations for the simulated events and study whether the resulting azimuthal anisotropies are consistent with the ATLAS results.</p></div>","PeriodicalId":788,"journal":{"name":"The European Physical Journal C","volume":"84 11","pages":""},"PeriodicalIF":4.2,"publicationDate":"2024-11-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1140/epjc/s10052-024-13543-6.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142636770","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}

{"title":"Thermodynamics and kinetics of state switching for the asymptotically flat black hole in a cavity","authors":"Ran Li,&nbsp;Jin Wang","doi":"10.1140/epjc/s10052-024-13535-6","DOIUrl":"10.1140/epjc/s10052-024-13535-6","url":null,"abstract":"<div><p>We propose that the thermodynamics and the kinetics of state switching for the asymptotically flat black hole enclosed by a cavity can be studied in terms of the free energy landscape formalism. The generalized free energy for the black hole enclosed by a cavity in the canonical ensemble is derived by using the York’s approach, where the temperature on the cavity and the charges inside the cavity are kept as the fixed parameters. By quantifying the corresponding free energy landscape, we obtain the phase diagrams for the black hole in cavity, which reveal a Hawking–Page type transition for the uncharged black hole and a Van der Waals type transition for the charged black hole. We further assume that the dynamics of black hole state switching is mutually determined by the gradient force and the stochastic force arising from the free energy landscape and the thermal noises respectively. We then derive a recurrence relation for the <i>n</i>-momentum of the first passage time distribution function, which enables the calculation of the kinetic times characterized by the mean first passage time and its relative fluctuation. Our analysis illustrates that the kinetics of black hole state switching is determined by the ensemble temperature and the barrier height on the free energy landscape.</p></div>","PeriodicalId":788,"journal":{"name":"The European Physical Journal C","volume":"84 11","pages":""},"PeriodicalIF":4.2,"publicationDate":"2024-11-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1140/epjc/s10052-024-13535-6.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142645418","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}

{"title":"Enhanced thermoelectric properties of zinc porphyrin dimers-based molecular devices","authors":"Dhia Saiwan Preesam,&nbsp;Hossain Milani Moghaddam,&nbsp;Mohammed Deia Noori","doi":"10.1140/epjd/s10053-024-00932-5","DOIUrl":"10.1140/epjd/s10053-024-00932-5","url":null,"abstract":"<div><p>In this study, we investigated the electrical and thermoelectric properties of the zinc porphyrin dimer and the double-dimer zinc porphyrin molecular junctions using density functional theory (DFT) combined with the non-equilibrium Green’s function method. Our results demonstrate that the electronic transport and thermoelectric properties of these junctions can be significantly improved in the presence of another dimer. By adding a new zinc porphyrin dimer, the electrical conductance (G) increased up to an order of magnitude and showed further enhancement in the Seebeck coefficient for a good range of Fermi energies. However, the situation is the opposite in the case of the structure of zinc porphyrin dimer without any additives. These results imply that through modifications in the molecular configuration, there exists a promising potential for enhancing the figure of merit (<i>ZT</i>) value, thereby these systems can be potentially utilized to increase the opportunities for versus application in molecular-scale thermoelectric energy generators we conducted a comparative analysis between the zinc porphyrin dimer and the double-dimer zinc porphyrin molecular junctions.</p><h3>Graphic abstract</h3><div><figure><div><div><picture><source><img></source></picture></div><div><p>Zinc porphyrin dimers-based molecular wire</p></div></div></figure></div></div>","PeriodicalId":789,"journal":{"name":"The European Physical Journal D","volume":"78 11","pages":""},"PeriodicalIF":1.5,"publicationDate":"2024-11-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142636675","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}