Few-Body Systems最新文献_第9页

Metastability of Repulsive Bose–Einstein Condensate in a Finite Trap and Instability of Ground State Energies 有限陷阱中斥力玻色-爱因斯坦凝聚态的可迁移性和基态能量的不稳定性

IF 1.7 4区物理与天体物理

Few-Body Systems Pub Date : 2024-03-07 DOI: 10.1007/s00601-024-01889-2

Pankaj Kumar Debnath

{"title":"Metastability of Repulsive Bose–Einstein Condensate in a Finite Trap and Instability of Ground State Energies","authors":"Pankaj Kumar Debnath","doi":"10.1007/s00601-024-01889-2","DOIUrl":"10.1007/s00601-024-01889-2","url":null,"abstract":"<div><p>The stability of trapped bosons with repulsive interaction is studied using an approximate many-body calculation. Instead of using the traditional harmonic trapping potential we consider an anharmonic potential of the form <span>(V_{anhar}(r)=frac{1}{2}momega ^{2}r^{2}+lambda r^{4})</span>. In our method, a correlated two-body basis function is used which considers all two-body correlations. It is explained that negative value of anharmonic parameter (<span>(lambda )</span>) are capable to change a stable condensate into a metastable one. Within this metastable condensate, we slowly increase the number of atom (<i>A</i>) and find a collapsing nature of repulsive condensate. The process of collapse of repulsive Bose–Einstein condensation (BEC) is completely different from the collapsing process of attractive BEC and it is explained in details. A dramatic behaviour of interaction energy, kinetic energy, trapping potential energy along with the total ground state energy of this metastable repulsive BEC is observed. We also study the instability of these zero point energies by varying <span>(lambda )</span> when fixed number of bosons are trapped by the anharmonic well and find critical values of <span>(lambda )</span> at which the system collapses. When the number of trapped particle is sufficiently high, a close interplay between number of particle and anharmonic strength is observed to remodel the shape of the effective metastable region.</p></div>","PeriodicalId":556,"journal":{"name":"Few-Body Systems","volume":null,"pages":null},"PeriodicalIF":1.7,"publicationDate":"2024-03-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140075136","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}

引用次数: 0

The Vector Planar DKP Oscillator Within a Minimal Length Uncertainty Relation 最小长度不确定性关系内的矢量平面 DKP 振荡器

IF 1.7 4区物理与天体物理

Few-Body Systems Pub Date : 2024-03-05 DOI: 10.1007/s00601-024-01884-7

Amenallah Andolsi, Yassine Chargui, Adel Trabelsi

引用次数: 0

Radiative Neutron Capture Rate of (^{11})B((n,gamma )^{12})B Reaction from the Coulomb Dissociation of (^{12})B 从 $$^{12}$ B 的库仑解离看 $$^{11}$ B $$(n,gamma )^{12}$ B 反应的辐射中子俘获率

IF 1.7 4区物理与天体物理

Few-Body Systems Pub Date : 2024-03-05 DOI: 10.1007/s00601-024-01888-3

Shubhchintak, G. Singh, R. Chatterjee, M. Dan

引用次数: 0

Breakup Amplitudes from the Pseudostate Extension of the Coupled-Reaction-Channels Method 耦合反作用通道法伪态扩展的破裂振幅

IF 1.7 4区物理与天体物理

Few-Body Systems Pub Date : 2024-03-02 DOI: 10.1007/s00601-024-01886-5

Zeki C. Kuruoğlu

{"title":"Breakup Amplitudes from the Pseudostate Extension of the Coupled-Reaction-Channels Method","authors":"Zeki C. Kuruoğlu","doi":"10.1007/s00601-024-01886-5","DOIUrl":"10.1007/s00601-024-01886-5","url":null,"abstract":"<div><p>A pseudochannel extension of the coupled-reaction-channel (CRC) ansatz had been used in earlier work to simulate the effect of the breakup channel on the rearrangement amplitudes. Comparisons with benchmark results on model systems established that rearrangement amplitudes and total breakup probability could be obtained accurately. However, achieving the same level of accuracy with respect to the state-to-state breakup amplitudes had eluded the earlier attempts that used global bases to generate the pseudo states. With the global bases it is difficult to control the spectrum of pseudostate energies and to obtain an optimal distribution of these pseudo-levels. In the present work, local bases in momentum space of the type used in Finite Element methods are employed. Pseudostates are generated using a local interpolation basis in the relative momentum of the two-body subsystem. Local nature of such a basis allows us to control the density of two-body pseudostates by simply adjusting the distribution of the grid points. In the present work, it is demonstrated that breakup amplitudes can be extracted quantitatively using pseudostates generated from a basis of local piecewise quadratic interpolation polynomials. For a local-potential s-wave model of the <span>(textrm{n}+textrm{d})</span> scattering, state-to-state breakup amplitudes obtained from the present approach are compared with the benchmark results available in the literature. Results further confirm that pseudostate-extended CRC method is a viable and efficient approach for three-particle scattering.</p></div>","PeriodicalId":556,"journal":{"name":"Few-Body Systems","volume":null,"pages":null},"PeriodicalIF":1.7,"publicationDate":"2024-03-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s00601-024-01886-5.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140019586","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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}

引用次数: 0

Many-Channel Microscopic Model for Resonance Structure in (^{9})Be and (^{9})B: Astrophysical Insights $$^{9}$ Be 和 $$^{9}$ B 中共振结构的多通道微观模型：天体物理学启示

IF 1.7 4区物理与天体物理

Few-Body Systems Pub Date : 2024-02-23 DOI: 10.1007/s00601-024-01881-w

Yuliia Lashko, Victor Vasilevsky, Victor Zhaba

引用次数: 0

Dynamical Vortex Production and Quantum Turbulence in Perturbed Bose–Einstein Condensates 扰动玻色-爱因斯坦凝聚态中的动态涡旋产生和量子湍流

IF 1.7 4区物理与天体物理

Few-Body Systems Pub Date : 2024-02-20 DOI: 10.1007/s00601-024-01879-4

Lauro Tomio, Anacé N. da Silva, S. Sabari, R. Kishor Kumar

引用次数: 0

Classical ‘Spin’ Filtering with Two Degrees of Freedom and Dissipation 具有两个自由度和耗散的经典 "自旋 "滤波器

IF 1.7 4区物理与天体物理

Few-Body Systems Pub Date : 2024-02-17 DOI: 10.1007/s00601-024-01880-x

Atul Varshney, Areg Ghazaryan, Artem Volosniev

引用次数: 0

Characterizing Klein–Fock–Gordon–Majorana Particles in (1 + 1) Dimensions 描述（1 + 1）维度上的克莱因-福克-戈登-马约拉纳粒子

IF 1.7 4区物理与天体物理

Few-Body Systems Pub Date : 2024-02-16 DOI: 10.1007/s00601-024-01882-9

Salvatore De Vincenzo

{"title":"Characterizing Klein–Fock–Gordon–Majorana Particles in (1 + 1) Dimensions","authors":"Salvatore De Vincenzo","doi":"10.1007/s00601-024-01882-9","DOIUrl":"10.1007/s00601-024-01882-9","url":null,"abstract":"<div><p>Theoretically, in (1 + 1) dimensions, one can have Klein–Fock–Gordon–Majorana (KFGM) particles. More precisely, these are one-dimensional (1D) Klein–Fock–Gordon (KFG) and Majorana particles at the same time. In principle, the wave equations considered to describe such first-quantized particles are the standard 1D KFG equation and/or the 1D Feshbach–Villars (FV) equation, each with a real Lorentz scalar potential and some kind of Majorana condition. The aim of this paper is to analyze the latter assumption fully and systematically; additionally, we introduce specific equations and boundary conditions to characterize these particles when they lie within an interval (or on a line with a tiny hole at a point). In fact, we write first-order equations in the time derivative that do not have a Hamiltonian form. We may refer to these equations as first-order 1D Majorana equations for 1D KFGM particles. Moreover, each of them leads to a second-order equation in time that becomes the standard 1D KFG equation when the scalar potential is independent of time. Additionally, we examine the nonrelativistic limit of one of the first-order 1D Majorana equations.</p></div>","PeriodicalId":556,"journal":{"name":"Few-Body Systems","volume":null,"pages":null},"PeriodicalIF":1.7,"publicationDate":"2024-02-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139763533","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}

引用次数: 0

Properties of N, (Delta ) Baryons with Screened Potential 具有屏蔽势能的 N, $$Delta $$ 重子的性质

IF 1.7 4区物理与天体物理

Few-Body Systems Pub Date : 2024-02-14 DOI: 10.1007/s00601-024-01883-8

Chandni Menapara, Ajay Kumar Rai

引用次数: 0

Resonances in the R-Matrix Method R 矩阵法中的共振

IF 1.7 4区物理与天体物理

Few-Body Systems Pub Date : 2024-02-04 DOI: 10.1007/s00601-023-01876-z

Pierre Descouvemont, Jérémy Dohet-Eraly

引用次数: 0