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Shape Coexistence in Proton Rich Se Isotopes 富质子硒同位素的形状共存
Bulgarian Journal of Physics Pub Date : 2022-02-11 DOI: 10.55318/bgjp.2022.49.1.108
A. Mukherjee
{"title":"Shape Coexistence in Proton Rich Se Isotopes","authors":"A. Mukherjee","doi":"10.55318/bgjp.2022.49.1.108","DOIUrl":"https://doi.org/10.55318/bgjp.2022.49.1.108","url":null,"abstract":"The structural features of the Se nucleus, obtained from our recent work [1], have been compared with the neighboring eveneven proton rich Se isotopes to get a better understanding about the presence of shape coexistence at low spin states. The corresponding alignment behaviour of different Se isotopes has been used to understand the shapes of the coexisting states at low excitation energy. The experimental results of Se isotopes have been interpreted in the framework of total Routhian surface (TRS) calculations.","PeriodicalId":217381,"journal":{"name":"Bulgarian Journal of Physics","volume":"25 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-02-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114392577","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. PART II “原子核的形状和动力学:当代方面”国际研讨会论文集(SDANCA-21)， 2021年9月16-18日，保加利亚索非亚。第二部分
Bulgarian Journal of Physics Pub Date : 2022-02-11 DOI: 10.55318/bgjp.2022.49.1.001
N. Minkov
{"title":"Proceedings of the International Workshop \"Shapes and Dynamics of Atomic Nuclei: Contemporary Aspects'' (SDANCA-21), 16-18 September 2021, Sofia, Bulgaria. PART II","authors":"N. Minkov","doi":"10.55318/bgjp.2022.49.1.001","DOIUrl":"https://doi.org/10.55318/bgjp.2022.49.1.001","url":null,"abstract":"","PeriodicalId":217381,"journal":{"name":"Bulgarian Journal of Physics","volume":"39 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-02-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115208735","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
Mentors Matter: A Tribute to David J. Rowe 导师很重要:致敬大卫·j·罗
Bulgarian Journal of Physics Pub Date : 2022-02-11 DOI: 10.55318/bgjp.2022.49.1.005
David J. Rowe, J. Draayer
{"title":"Mentors Matter: A Tribute to David J. Rowe","authors":"David J. Rowe, J. Draayer","doi":"10.55318/bgjp.2022.49.1.005","DOIUrl":"https://doi.org/10.55318/bgjp.2022.49.1.005","url":null,"abstract":"The role David Rowe played in advancing our understanding of nuclear structure has been pivotal to modernizing the theory into one that does not require the use of an effective charge concept, and one that is extensible across the chart of the nuclides. We briefly review how this flows from the early history of the field, focusing especially on David’s role in helping to bridge the divide between single-particle models and collective models of nuclear structure, and how this has led to the development of a beautiful and bold algebraic framework that underpins a theory of choice for future nuclear structure studies. Looking forward, David Rowe’s work also underpins current follow-on efforts focused on paving the way for the construction of yet another bridge, one that should help to span the chasm between low-energy and high-energy nuclear physics. If successful, the latter could ultimately lead to a truly ab initio framework for gaining a far broader understanding of nuclear structure, one that tracks forward from the fundamental structure of hadrons, especially protons and neutrons, and how they in turn conspire to give us atomic nuclei that in reality are the building blocks of the universe in which we live.","PeriodicalId":217381,"journal":{"name":"Bulgarian Journal of Physics","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-02-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131515195","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
The Dominance of Deformation in Nuclei and Its Roots in a Symplectic Effective Field Theory 辛有效场论中核变形的优势及其根源
Bulgarian Journal of Physics Pub Date : 2022-02-11 DOI: 10.55318/bgjp.2022.49.1.021
J. Draayer
{"title":"The Dominance of Deformation in Nuclei and Its Roots in a Symplectic Effective Field Theory","authors":"J. Draayer","doi":"10.55318/bgjp.2022.49.1.021","DOIUrl":"https://doi.org/10.55318/bgjp.2022.49.1.021","url":null,"abstract":"To position in time our recent efforts to advance a forwardleaning many-particle shell-model theory for nuclear structure studies, we start with a review of major developments in nuclear physics over the last (20th) century, focusing especially on the last half as the mathematical framework that underpins our efforts was by-and-large developed by master subatomic theorists from the 50s through the 80s. Additionally, the landscape changed dramatically with the advent in the 90s of highperformance computing (HPC) facilities that could be used to test more complex theories that in prior times were deemed to be beyond reach. The first of these modern theories, the so-called no-core shell model (NCSM), taught us that one can carryout nuclear structure calculations using realistic interactions deduced from nucleon scattering data. Subsequently we set out to explore whether this could be extended to algebraic models that involve non-compact group structures. A stretch goal of the latter campaign was to move away from a point-particlepicture of nuclei to a theory that is driven by the structure of the constituent nucleons themselves. What follows describes our efforts to date in moving towards this goal, and in the last section of this manuscript we proffered a novel symplectic effective field theory that may begin to pave the way for achieving this objective of breaking down barriers between a low-energy and high-energy view of nuclear physics, opening the door to what might best be called a truly unified ‘ab initio’ theory for subatomic nuclear structure studies.","PeriodicalId":217381,"journal":{"name":"Bulgarian Journal of Physics","volume":"27 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-02-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128120000","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
Shape Mixing and Clustering in Nuclei: Probing Physics beyond the Standard Model 原子核中的形状混合和聚类:超越标准模型的探索物理学
Bulgarian Journal of Physics Pub Date : 2022-02-11 DOI: 10.55318/bgjp.2022.49.1.047
G. Sargsyan
{"title":"Shape Mixing and Clustering in Nuclei: Probing Physics beyond the Standard Model","authors":"G. Sargsyan","doi":"10.55318/bgjp.2022.49.1.047","DOIUrl":"https://doi.org/10.55318/bgjp.2022.49.1.047","url":null,"abstract":"The ab initio methods in nuclear physics play a major role due to their use of realistic internucleon interactions that grant them predictive capabilities. One of these models – the symmetry-adapted nocore shell model (SA-NCSM) – is capable of reaching the medium-mass region of the chart of the nuclides, by exploiting the emergent symmetries of nuclei, and is therefore well-suited for studying collective correlations and beta decay modes. We apply the SA-NCSM to calculate beta-decay observables essential to probe physics beyond the Standard Model. Our calculations of higher-order recoil terms in the beta decay of Li help to significantly reduce the uncertainties in high-precision experiments that study the vector minus axial vector (V−A) structure of the weak interaction. Furthermore, we calculate neutrinoless double beta decay matrix elements important for determining whether the neutrino is its own antiparticle.","PeriodicalId":217381,"journal":{"name":"Bulgarian Journal of Physics","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-02-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126425743","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
Revisiting the Concept of Nuclear Rotation: Quantum and Classical Viewpoints 重新审视核旋转的概念:量子和经典观点
Bulgarian Journal of Physics Pub Date : 2022-02-11 DOI: 10.55318/bgjp.2022.49.1.097
M. Oi
{"title":"Revisiting the Concept of Nuclear Rotation: Quantum and Classical Viewpoints","authors":"M. Oi","doi":"10.55318/bgjp.2022.49.1.097","DOIUrl":"https://doi.org/10.55318/bgjp.2022.49.1.097","url":null,"abstract":"Nuclear rotation is revisited to seek for a new perspective. Review is made first for the basic concept of the nuclear rotation. Then, the quantization procedure of the rigid-body Hamiltonian is reviewed for a quantum mechanical understanding of the dynamics of rigid-body rotations. A linear rigid body is then investigated and its motion is studied from classical and quantum viewpoints. Finally, an application of the linear rigid-body rotation is attempted for a description of elongated nuclear systems, such as Beryllium 8, a two-alpha-cluster system.","PeriodicalId":217381,"journal":{"name":"Bulgarian Journal of Physics","volume":"3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-02-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132208910","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
Linking Partial Dynamical Symmetry to Nuclear Energy Density Functional 将部分动力对称与核能密度泛函联系起来
Bulgarian Journal of Physics Pub Date : 2021-12-20 DOI: 10.55318/bgjp.2022.49.1.067
A. Leviatan, N. Gavrielov, K. Nomura
{"title":"Linking Partial Dynamical Symmetry to Nuclear Energy Density Functional","authors":"A. Leviatan, N. Gavrielov, K. Nomura","doi":"10.55318/bgjp.2022.49.1.067","DOIUrl":"https://doi.org/10.55318/bgjp.2022.49.1.067","url":null,"abstract":"We use self-consistent mean-field methods in combination with the interacting boson model (IBM) of nuclei, to establish a linkage between universal energy density functionals (EDFs) and partial dynamical symmetry (PDS). An application to Er shows that IBM Hamiltonians derived microscopically from known nonrelativistic and relativistic EDFs in this region, conform with SU(3)-PDS.","PeriodicalId":217381,"journal":{"name":"Bulgarian Journal of Physics","volume":"224 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-12-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121255435","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 Investigation of the Nuclear Structure in the Neutron-Rich 180Hf 富中子180Hf核结构的实验研究
Bulgarian Journal of Physics Pub Date : 2021-12-18 DOI: 10.55318/bgjp.2021.48.5-6.618
P. Vasileiou
{"title":"Experimental Investigation of the Nuclear Structure in the Neutron-Rich 180Hf","authors":"P. Vasileiou","doi":"10.55318/bgjp.2021.48.5-6.618","DOIUrl":"https://doi.org/10.55318/bgjp.2021.48.5-6.618","url":null,"abstract":"The structure of Hf (Z = 72) is of particular interest, as the nucleus features a rotational ground state band, but also several other collective bands, K–isomers, and non–band members, which are generally poorly known. This work features preliminary results from a recent experimental campaign at IFIN–HH, Romania, aimed at measuring lifetimes of excited states in the neutron–rich Hf , by means of the RDDS technique. The Ta(B, C)Hf proton pick–up reaction was used to populate excited states in the Hf nucleus. The γ transitions depopulating these levels were detected using the ROSPHERE array, in its 25 HPGe configuration. The array was coupled to the SORCERER particle detector and a plunger device enabling the study of p–γ and p–γ–γ coincident events. Six plunger distances were chosen, allowing for the construction of the decay curves of the observed γ transitions, from which the lifetimes of the levels of interest can subsequently be deduced.","PeriodicalId":217381,"journal":{"name":"Bulgarian Journal of Physics","volume":"1 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":"115714157","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
Shape Evolution in Ge, Se, Kr and Sr Nuclei within the Covariant Density Functional Theory 协变密度泛函理论中Ge、Se、Kr和Sr核的形状演化
Bulgarian Journal of Physics Pub Date : 2021-12-18 DOI: 10.55318/bgjp.2021.48.5-6.432
M. El Adri, M. Oulne
{"title":"Shape Evolution in Ge, Se, Kr and Sr Nuclei within the Covariant Density Functional Theory","authors":"M. El Adri, M. Oulne","doi":"10.55318/bgjp.2021.48.5-6.432","DOIUrl":"https://doi.org/10.55318/bgjp.2021.48.5-6.432","url":null,"abstract":"A systematic study of the shape evolution in Ge (Z = 32), Se (Z = 34), Kr (Z = 36) and Sr (Z = 38) isotones for N = 70, and their neighboring isotones with N = 68 and N = 72 is presented. We use, in this investigation, the covariant density functional theory (CDFT) with the explicit Density Dependent Meson-Exchange (DD-ME2) and Density-Dependent Point-Coupling (DD-PC1) models. The finite range pairing interaction separable in coordinate space which was proposed by Tian et al. has been used to treat the pairing correlations. By investigating structural properties of nuclei under consideration, it is found that N = 70 isotones are, in generally, spheric. Furtheremore, the N = 70 can be considered as magic number.","PeriodicalId":217381,"journal":{"name":"Bulgarian Journal of Physics","volume":"62 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":"129561184","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
Shape Coexistence in 74Ge, 74Se and 74Kr Investigated by Phenomenological and Microscopic Models 用现象学和微观模型研究74Ge、74Se和74Kr的形态共存
Bulgarian Journal of Physics Pub Date : 2021-12-18 DOI: 10.55318/bgjp.2021.48.5-6.475
A. Ait Ben Mennana
{"title":"Shape Coexistence in 74Ge, 74Se and 74Kr Investigated by Phenomenological and Microscopic Models","authors":"A. Ait Ben Mennana","doi":"10.55318/bgjp.2021.48.5-6.475","DOIUrl":"https://doi.org/10.55318/bgjp.2021.48.5-6.475","url":null,"abstract":"","PeriodicalId":217381,"journal":{"name":"Bulgarian Journal of Physics","volume":"339 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":"133117807","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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