Bulgarian Journal of Physics最新文献_第9页

A Unified Description of Spectra of Different Configurations, Deformation and Energy Regions 不同构型、变形和能区光谱的统一描述

Bulgarian Journal of Physics Pub Date : 2021-12-18 DOI: 10.55318/bgjp.2021.48.5-6.524

G. Riczu

引用次数: 2

Present-Day Research Opportunities with Quasimonochromatic γ Beams 当前准单色γ光束的研究机会

Bulgarian Journal of Physics Pub Date : 2021-12-18 DOI: 10.55318/bgjp.2021.48.5-6.597

D. Balabanski

引用次数: 0

Symmetry and Shape Coexistence in 10Be 10Be中的对称与形状共存

Bulgarian Journal of Physics Pub Date : 2021-12-08 DOI: 10.55318/bgjp.2022.49.1.057

M. Caprio, A. McCoy, P. Fasano, T. Dytrych

引用次数: 1

Global Performance of Covariant Density Functional Theory in Description of Charge Radii and Related Indicators 协变密度泛函理论在电荷半径及相关指标描述中的全局性能

Bulgarian Journal of Physics Pub Date : 2021-11-08 DOI: 10.55318/bgjp.2021.48.5-6.375

A. Afanasjev, U. Perera, P. Ring

引用次数: 1

Microscopic Version of the Bohr-Mottelson Model and Its Application 玻尔-莫特森模型的微观版本及其应用

Bulgarian Journal of Physics Pub Date : 2021-11-02 DOI: 10.55318/bgjp.2021.48.5-6.421

H. Ganev

引用次数: 2

Thermal Effects on Tidal Deformability of a Coalescing Binary Neutron Star System 合并双中子星系统潮汐变形的热效应

Bulgarian Journal of Physics Pub Date : 2021-10-19 DOI: 10.55318/bgjp.2021.48.5-6.567

A. Kanakis-Pegios, P. Koliogiannis, C. Moustakidis

{"title":"Thermal Effects on Tidal Deformability of a Coalescing Binary Neutron Star System","authors":"A. Kanakis-Pegios, P. Koliogiannis, C. Moustakidis","doi":"10.55318/bgjp.2021.48.5-6.567","DOIUrl":"https://doi.org/10.55318/bgjp.2021.48.5-6.567","url":null,"abstract":"The study of neutron star mergers by the detection of the emitted gravitational waves is one of the most promised tools to study the properties of dense nuclear matter at high densities. It is worth claiming that, at the moment, strong evidence that the temperature of the stars is zero during the last orbits before coalescing does not exist. Contrariwise, there are some theoretical predictions suggesting that the star’s temperature might even be a few MeV. According to the main theory, the tides transfer mechanical energy and angular momentum to the star at the expense of the orbit, where friction within the star converts the mechanical energy into heat. During the inspiral these effects are potentially detectable. Different treatments have been used to estimate the transfer of the mechanical energy and the size of the tidal friction, leading to different conclusions about the importance of pre-merger tidal effects. The present work is dedicated to the study of the effect of temperature on the tidal deformability of neutron stars during the inspiral of a neutron star system just before the merger. We applied a class of hot equations of state originated from various nuclear models and found that even for low values of temperature (T < 1 MeV) the effects on the basic ingredients of tidal deformability are not negligible. However, according to the main finding, the effect of the temperature on the tidal deformability is indistinguishable. The consequences of this unexpected result are discussed and analyzed.","PeriodicalId":217381,"journal":{"name":"Bulgarian Journal of Physics","volume":"37 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-10-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133207271","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Unified Picture of Nucleon Pairs Playing Leading Roles in Nuclear Collectivity 核子对在核集体中起主导作用的统一图景

Bulgarian Journal of Physics Pub Date : 2021-10-15 DOI: 10.55318/bgjp.2021.48.5-6.441

D. Bonatsos, A. Martinou, I. E. Assimakis, S. Peroulis, S. Sarantopoulou, N. Minkov

{"title":"Unified Picture of Nucleon Pairs Playing Leading Roles in Nuclear Collectivity","authors":"D. Bonatsos, A. Martinou, I. E. Assimakis, S. Peroulis, S. Sarantopoulou, N. Minkov","doi":"10.55318/bgjp.2021.48.5-6.441","DOIUrl":"https://doi.org/10.55318/bgjp.2021.48.5-6.441","url":null,"abstract":"Proxy-SU(3) symmetry is an approximation scheme extending the Elliott SU(3) algebra of the sd shell to heavier shells. When introduced in 2017, the approximation had been justified by calculations carried out within the Nilsson model, with nucleon pairs differing by $Delta K [Delta N Delta n_z Delta Lambda]=0[110]$ in the Nilsson quantum numbers playing a major role in the approximation. Recently our group managed to map the cartesian basis of the Elliott SU(3) model onto the spherical shell model basis, fully clarifying the approximations used within the proxy-SU(3) scheme and paving the way for using the proxy-SU(3) approximation in shell model calculations for heavy nuclei. As a by-product, the relation of the 0[110] Nilsson pairs used in proxy-SU(3) to the earlier used de Shalit-Goldhaber pairs $|Delta n Delta l Delta j Delta m_jrangle = | 0110rangle$ in spherical shell model notation is clarified, while the Federman-Pittel (FP) pairs known to play a major role at the onset of deformation are identified as $| 0010rangle$ pairs, and the FP pairs further increasing the deformation after its onset are found to be $| 0110rangle$ pairs, i.e. identical to the de-Shalit-Goldhaber pairs. The connection between the proxy-SU(3) scheme and the spherical shell model has also been worked out in the original framework of the Nilsson model, with identical results.","PeriodicalId":217381,"journal":{"name":"Bulgarian Journal of Physics","volume":"42 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130078330","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

Deflection of Light due to Spheroidal Oblate Static Objects 由于球形扁圆静态物体引起的光偏转

Bulgarian Journal of Physics Pub Date : 2021-04-29 DOI: 10.55318/bgjp.2023.50.1.027

Ranchhaigiri Brahma, A. Sen

引用次数: 0

Proof of the Orthogonal–Pin Duality 正交针对偶的证明

Bulgarian Journal of Physics Pub Date : 2020-06-14 DOI: 10.55318/bgjp.2023.50.2.146

K. N. Fjordtoften, Denmark Received

引用次数: 0

Consideration on the Relationship of Theoretical Ultraviolet Cut-Off Energy with Experimental Data 理论紫外截止能与实验数据关系的思考

Bulgarian Journal of Physics Pub Date : 2018-08-23 DOI: 10.55318/bgjp.2023.50.1.076

K. Fukushima, Hikaru Sato

{"title":"Consideration on the Relationship of Theoretical Ultraviolet Cut-Off Energy with Experimental Data","authors":"K. Fukushima, Hikaru Sato","doi":"10.55318/bgjp.2023.50.1.076","DOIUrl":"https://doi.org/10.55318/bgjp.2023.50.1.076","url":null,"abstract":"We formulated a field theory by using localized basis functions in space-time elements, which are obtained by dividing the space-time continuum into irregular hyper-octahedra (orthoplexes). Each field is expressed as a linear combination of the scalar basis functions (whose derivatives can be expressed in terms of the Dirac delta function) with rotationally invariant coefficients. Using this formalism mapped to continuum theory with its corresponding ultraviolet cut-off energy, the cosmological constant was related to the cut-off energy of the quadratic Higgs self-energy. Using current particle-cosmological particle and cosmological data, this study determines the Minkowski cut-off energy. From the literature, examinations find an experimental break in the cosmic ray energy spectrum called a 'knee' at about 3 PeV, which agrees with this theoretical ultraviolet cut-off energy. The origin of cosmic rays is understood astrophysically below 1 PeV, while it is unclear above 3 PeV. By analogy to solid state physics, additional energy contributions from basis functions may result in the tail of the energy spectrum above the cut-off energy. The basis functions reproduce experimental spectra above the ultraviolet cut-off energy. The knee is caused by the diffuse scattering of cosmic rays by the irregular space-time lattice. Since this diffuse scattering indicates high scattering probabilities for particles with a tiny/zero rest mass, this theory is consistent with the absence of any experimental detection of photons and neutrinos above about the knee energy.","PeriodicalId":217381,"journal":{"name":"Bulgarian Journal of Physics","volume":"14 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-08-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133234674","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0