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Bulgarian Journal of Physics最新文献

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Constraints on the Equation of State of Dense Nuclear Matter from the Tidal Deformability of Neutron Stars 中子星潮汐变形对致密核物质状态方程的约束
Bulgarian Journal of Physics Pub Date : 2021-12-18 DOI: 10.55318/bgjp.2021.48.5-6.577
Stars., A. Kanakis-Pegios, P. Koliogiannis, C. Moustakidis
{"title":"Constraints on the Equation of State of Dense Nuclear Matter from the Tidal Deformability of Neutron Stars","authors":"Stars., A. Kanakis-Pegios, P. Koliogiannis, C. Moustakidis","doi":"10.55318/bgjp.2021.48.5-6.577","DOIUrl":"https://doi.org/10.55318/bgjp.2021.48.5-6.577","url":null,"abstract":"Neutron stars constitute a very promising natural laboratory for studying the properties of dense nuclear matter and the equation of state. One microscopic parameter that is of great interest is the speed of sound, especially the upper bound on it. This work is based on the idea to examine possible constraints on the speed of sound by using neutron stars. For this purpose, in our study, we use the observed effective tidal deformability from binary neutron star systems as a tool to impose constraints on the equation of state through the upper bound on the speed of sound. In our approach, we parametrize the stiffness of the equation of state by using the speed of sound, for various transition density values. The two recent observations of binary neutron star mergers from LIGO/VIRGO have been used to impose robust constraints. Furthermore, we extended our study in the hypothetical scenario of a very massive neutron star by using the recent observation of the GW190814 event. The possibility of the existence of such a massive non-rotating neutron star cannot be excluded according to our study. Furthermore, we postulate what kind of future observations would be useful to impose more stringent constraints on the properties of the equation of state.","PeriodicalId":217381,"journal":{"name":"Bulgarian Journal of Physics","volume":"25 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-12-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132088149","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
Proceedings of the International Workshop Shapes and Dynamics of Atomic Nuclei: Contemporary Aspects (SDANCA-21), 16-18 September 2021, Sofia, Bulgaria 国际研讨会会议记录原子核形状和动力学:当代方面(SDANCA-21)， 2021年9月16-18日，保加利亚索非亚
Bulgarian Journal of Physics Pub Date : 2021-12-18 DOI: 10.55318/bgjp.2021.48.5-6.371
N. Minkov
{"title":"Proceedings of the International Workshop Shapes and Dynamics of Atomic Nuclei: Contemporary Aspects (SDANCA-21), 16-18 September 2021, Sofia, Bulgaria","authors":"N. Minkov","doi":"10.55318/bgjp.2021.48.5-6.371","DOIUrl":"https://doi.org/10.55318/bgjp.2021.48.5-6.371","url":null,"abstract":"This volume contains articles based on presentations given at the International Workshop \"Shapes and Dynamics of Atomic Nuclei: Contemporary Aspects\" (SDANCA-21) held in Sofia Tech Park, Sofia, Bulgaria from the 16-th to the 18-th of September 2021. The Workshop was organized by researchers from the Institute of Nuclear Research and Nuclear Energy (INRNE) in Bulgarian Academy of Sciences (BAS) with the financial support of the Bulgarian National Science Fund under contracts No. KP-06-N48/1, KP-06-N28/6 and KP-06-RILA/6. It appears as the fourth issue of the workshops {SDANCA-15}, {SDANCA-17} and {SDANCA-19} held in Sofia in 2015, 2017 and 2019, respectively...","PeriodicalId":217381,"journal":{"name":"Bulgarian Journal of Physics","volume":"33 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-12-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121760751","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
Shapes and Symmetries in A ∼ 130 Nuclei: A Perspective through Measured Transition Probabilities A ~ 130核的形状和对称性:通过测量跃迁概率的视角
Bulgarian Journal of Physics Pub Date : 2021-12-18 DOI: 10.55318/bgjp.2021.48.5-6.645
P. Das
{"title":"Shapes and Symmetries in A ∼ 130 Nuclei: A Perspective through Measured Transition Probabilities","authors":"P. Das","doi":"10.55318/bgjp.2021.48.5-6.645","DOIUrl":"https://doi.org/10.55318/bgjp.2021.48.5-6.645","url":null,"abstract":"","PeriodicalId":217381,"journal":{"name":"Bulgarian Journal of Physics","volume":"89 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-12-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114354062","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
Investigation of Ground State Properties and Shape Evolution in Pt Isotopes Pt同位素基态性质及形状演化的研究
Bulgarian Journal of Physics Pub Date : 2021-12-18 DOI: 10.55318/bgjp.2021.48.5-6.400
Y. El Bassem, M. Oulne
{"title":"Investigation of Ground State Properties and Shape Evolution in Pt Isotopes","authors":"Y. El Bassem, M. Oulne","doi":"10.55318/bgjp.2021.48.5-6.400","DOIUrl":"https://doi.org/10.55318/bgjp.2021.48.5-6.400","url":null,"abstract":"Abstract. In this study, the ground-state properties of the platinum isotopic chain, 160−238Pt are studied within the covariant density functional theory. The calculations are carried out for a large number of eveneven Pt isotopes by using the density-dependent point-coupling and the density dependent meson-exchange effective interactions. Several ground-state properties such as the binding energy, separation energy and quadrupole deformation are discussed and compared with available experimental data, and with the predictions of some nuclear models such as the Relativistic Mean Field (RMF) model with NL3∗ functional and the Hartree Fock Bogoliubov (HFB) method with UNEDF0 Skyrme force. The shape phase transition for Pt isotopic chain is also studied.","PeriodicalId":217381,"journal":{"name":"Bulgarian Journal of Physics","volume":"20 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-12-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131912883","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
Nuclear Structure Studies with High-Precision Mass Measurements of Spontaneous Fission Fragments at the FRS Ion Catcher 用FRS离子捕集器对自发裂变碎片进行高精度质量测量的核结构研究
Bulgarian Journal of Physics Pub Date : 2021-12-18 DOI: 10.55318/bgjp.2021.48.5-6.535
A. Spataru
{"title":"Nuclear Structure Studies with High-Precision Mass Measurements of Spontaneous Fission Fragments at the FRS Ion Catcher","authors":"A. Spataru","doi":"10.55318/bgjp.2021.48.5-6.535","DOIUrl":"https://doi.org/10.55318/bgjp.2021.48.5-6.535","url":null,"abstract":"Nuclear mass is a key property of atomic nuclei. The accurate determination of nuclear masses provides information for the nuclear shell structure and nuclear deformations. The FRS Ion Catcher experimental setup at GSI, Darmstadt was used to perform mass measurements of Cf fragments using a multiple-reflection time-of-flight mass spectrometer. The reported results are compared to previous measurements and their implication in the estimation of two-neutron separation energy is discussed.","PeriodicalId":217381,"journal":{"name":"Bulgarian Journal of Physics","volume":"78 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-12-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124730624","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
A γ-Rigid Solution of the Bohr Hamiltonian with Deformation-Dependent Mass Term for Kratzer Potential and γ = 30° 具有变形依赖质量项的Kratzer势和γ = 30°玻尔哈密顿量的γ-刚性解
Bulgarian Journal of Physics Pub Date : 2021-12-18 DOI: 10.55318/bgjp.2021.48.5-6.514
S. Ait El Korchi
{"title":"A γ-Rigid Solution of the Bohr Hamiltonian with Deformation-Dependent Mass Term for Kratzer Potential and γ = 30°","authors":"S. Ait El Korchi","doi":"10.55318/bgjp.2021.48.5-6.514","DOIUrl":"https://doi.org/10.55318/bgjp.2021.48.5-6.514","url":null,"abstract":"","PeriodicalId":217381,"journal":{"name":"Bulgarian Journal of Physics","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-12-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114541998","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
Experimental Investigations of Nuclear Structure around A = 180 A = 180附近核结构的实验研究
Bulgarian Journal of Physics Pub Date : 2021-12-18 DOI: 10.55318/bgjp.2021.48.5-6.625
T. Mertzimekis
{"title":"Experimental Investigations of Nuclear Structure around A = 180","authors":"T. Mertzimekis","doi":"10.55318/bgjp.2021.48.5-6.625","DOIUrl":"https://doi.org/10.55318/bgjp.2021.48.5-6.625","url":null,"abstract":"Mid–heavy nuclei with A ∼ 140 − 180 offer unique opportunities to study the collective and single–particle aspects of nuclear structure. This mass regime is a dynamic area where protons and neutrons generally occupy different orbitals, giving rise to complex structures with a wide variety of shapes, shape evolution and shape coexistence. To that end, measurements of nuclear lifetimes and transition matrix elements can be invaluable. Recent experimental activities of the NuSTRAP group in Athens have focused on γ–spectroscopy studies employing the ROSPHERE array in Magurele, Romania. A brief overview is reported.","PeriodicalId":217381,"journal":{"name":"Bulgarian Journal of Physics","volume":"48 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-12-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124242256","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: 1
Microscopic Description of Shape Transitions and Shape Coexistence in Hg Isotopes 汞同位素形态转变与形态共存的微观描述
Bulgarian Journal of Physics Pub Date : 2021-12-18 DOI: 10.55318/bgjp.2021.48.5-6.495
V. V. Prassa
{"title":"Microscopic Description of Shape Transitions and Shape Coexistence in Hg Isotopes","authors":"V. V. Prassa","doi":"10.55318/bgjp.2021.48.5-6.495","DOIUrl":"https://doi.org/10.55318/bgjp.2021.48.5-6.495","url":null,"abstract":"","PeriodicalId":217381,"journal":{"name":"Bulgarian Journal of Physics","volume":"54 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-12-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122480910","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
Level Densities of Heavy Nuclei and Fission Dynamics 重核能级密度与裂变动力学
Bulgarian Journal of Physics Pub Date : 2021-12-18 DOI: 10.55318/bgjp.2021.48.5-6.485
A. Rahmatinejad
{"title":"Level Densities of Heavy Nuclei and Fission Dynamics","authors":"A. Rahmatinejad","doi":"10.55318/bgjp.2021.48.5-6.485","DOIUrl":"https://doi.org/10.55318/bgjp.2021.48.5-6.485","url":null,"abstract":"The nuclear level densities and level-density parameters in fissioning nuclei at their saddle points of fission barriers, as well as those for neutron, proton, and α-particle emission residues at the ground states are calculated for isotopic chains of superheavy nuclei with Z = 114– 120. The calculations are performed with superfluid formalism using the single-particle energies obtained with the Woods-Saxon potential. The influence of shell effects on energy dependence of the ratios of leveldensity parameters corresponding to the residues of considered decay modes to those of neutron emission is analyzed. The effect of collective enhancement of level densities on the level-density parameter ratios is studied. In the case of alpha decay, we identified the collective enhancement caused by cluster degrees of freedom to play an important role.","PeriodicalId":217381,"journal":{"name":"Bulgarian Journal of Physics","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-12-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123213600","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
Probing the Single-Particle Neutron Origin of the Pygmy Dipole Resonance 探测矮偶极子共振的单粒子中子起源
Bulgarian Journal of Physics Pub Date : 2021-12-18 DOI: 10.55318/bgjp.2021.48.5-6.587
N. Tsoneva
{"title":"Probing the Single-Particle Neutron Origin of the Pygmy Dipole Resonance","authors":"N. Tsoneva","doi":"10.55318/bgjp.2021.48.5-6.587","DOIUrl":"https://doi.org/10.55318/bgjp.2021.48.5-6.587","url":null,"abstract":"The first comprehensive study of the single-particle structure of pygmy dipole resonance (PDR) in double-magic Pb and semi-magic Sn nuclei with an excess of neutrons is presented. Theoretical calculations are carried out with a microscopic approach based on the energy-density functional plus quasiparticle-phonon model (EDF + QPM) and combined with nuclear reaction theory. The obtained theoretical results are compared to novel Pb(d,p)Pb and Sn(d,pγ)Sn experiments and other available experimental data. In addition, various properties of the dipole strength distributions are discussed in order to elucidate the microscopic structure of the PDR in detail. The studies will support ELI-Gamma-Above-Neutron-Threshold (ELIGANT) day-one experiments at the ELI-NP.","PeriodicalId":217381,"journal":{"name":"Bulgarian Journal of Physics","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-12-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115650085","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
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