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New results on nuclear magicity and possible extension of the nuclear landscape 核奇迹的新成果和核景观的可能扩展
Pub Date : 2021-05-01 DOI: 10.1142/S0218301321500385
M. Ismail, A. Ellithi, A. Khaled, H. Anwer
In nuclear theory, there is always a quest for possible extensions of the nuclear landscape and extending our knowledge to the limits of nuclear existence. In this study, we examine the stability and structural properties of a wide range of nuclei in super- and ultra-heavy region in a phenomenological semi-microscopic approach. we calculated the shell correlation energy, residual pairing correction energy, two-nucleon separation energy and two-nucleon energy gap for 3670 even–even nuclei along [Formula: see text]-stability line and two-neutron driplines in the ranges [Formula: see text] with [Formula: see text] and [Formula: see text] with [Formula: see text], respectively. To assure reliability and confidence of the new results in the ultra-heavy region, we extended the search space to include heavy and super-heavy nuclei. We report 83 double magic nuclei and address the predominance of proton and neutron magic numbers. Our calculations reproduced known results on nuclear magicity and present strong evidences on islands of stability and magic numbers in super- and ultra-heavy regions. We also address shifts in nuclear magicity along the nuclear landscape close to the [Formula: see text]-stability line and close to the neutron rich regions.
在核理论中,总是有一种对核景观可能扩展的探索,并将我们的知识扩展到核存在的极限。在这项研究中,我们用现象学的半微观方法研究了超重区和超重区各种核的稳定性和结构性质。在[公式:见文]和[公式:见文]范围内,沿[公式:见文]和[公式:见文]分别计算了3670个偶偶核在[公式:见文]和[公式:见文]范围内的壳相关能、剩余配对校正能、双核子分离能和双核子能隙。为了保证新结果在超重区域的可靠性和置信度,我们将搜索空间扩展到包括重核和超重核。我们报道了83个双幻核,并讨论了质子和中子幻数的优势。我们的计算再现了已知的核魔法结果,并提供了在超重和超重区域的稳定岛和魔法数的有力证据。我们还讨论了靠近[公式:见文本]稳定线和靠近富中子区域的核景观中核魔力的变化。
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引用次数: 0
Research of beam matching on RFQ for CADS proton linac CADS质子直线加速器RFQ光束匹配研究
Pub Date : 2021-04-29 DOI: 10.1142/S0218301321500270
Chao Wang, W. Dou, Zhi-jun Wang, C. Feng, Wang-sheng Wang, Weilong Chen, Yongzhi Jia, Shuhui Liu, Yuan He, Yuanshuai Qin, Y. Tao
For a high-power Radio Frequency quadrupole (RFQ) accelerator, it is often necessary to design a large acceptance to decrease the beam loss inside the RFQ cavity. This could allow a mismatched beam...
对于大功率射频四极(RFQ)加速器,通常需要设计一个大的接收口来减少RFQ腔内的波束损耗。这可能会导致不匹配的光束…
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引用次数: 1
Residual np-interaction and mass predictions in transfermium region 转移区剩余np相互作用和质量预测
Pub Date : 2021-04-29 DOI: 10.1142/S0218301321500257
E. V. Vladimirova, B. Ishkhanov, M. Simonov, S. Sidorov, T. Tretyakova
We study the consistency of local mass relation approach in its application to prediction of nuclear masses in the region of superheavy elements. Binding energy calculations are carried out for nuclei with A > 200 using formulas for evaluation of residual np-interaction. The results are found to be in good agreement with the experimental data AME2016. We also make predictions for characteristics of α-decay in isotopes Z = 101–106, N = 144–157.
研究了局部质量关系法在超重元素区核质量预测中的一致性。利用剩余np相互作用的计算公式,计算了A > 200的原子核的结合能。结果与AME2016的实验数据吻合较好。我们还预测了Z = 101 ~ 106, N = 144 ~ 157同位素α-衰变的特征。
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引用次数: 1
Description of the negative- and positive-parity states in odd-A Radon and Francium isotopes within the framework of the interacting Boson–Fermion model 在相互作用玻色子-费米子模型的框架内描述奇数a氡和钫同位素的负和正宇称态
Pub Date : 2021-04-27 DOI: 10.1142/S021830132150035X
Musa M. Mahdi
The negative- and positive-parity states and electromagnetic transitions for [Formula: see text]Rn and [Formula: see text]Fr nuclei have been studied by using the Interacting Boson–Fermion Approximation (IBFM-1). Based on our calculations, the spin assignments for some states with uncertain spin have been done. Energy spectra, electromagnetic transition probabilities and branching ratios in these isotopes are calculated and compared with available experimental data. The wave functions are analyzed to understand the nuclear structure. In addition, some predictions of levels that have no experimental data are presented such as spin and electromagnetic transitions. Good results were obtained with a decrease in the collectivity properties, especially for the most neutron-deficient isotopes.
用相互作用玻色子-费米子近似(IBFM-1)研究了Rn和Fr核的负、正宇称态和电磁跃迁。在此基础上,对一些自旋不确定的态进行了自旋赋值。计算了这些同位素的能谱、电磁跃迁概率和分支比,并与现有实验数据进行了比较。通过对波函数的分析来了解原子核的结构。此外,还提出了一些没有实验数据的能级的预测,如自旋和电磁跃迁。在总体特性降低的情况下获得了良好的结果,特别是对于大多数中子亏缺的同位素。
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引用次数: 0
First observation of collective rotational bands in neutron-rich 142La and the study of octupole/triaxial deformations in 142,143La 富中子142La中集体旋转带的首次观测及142143la中八极/三轴变形的研究
Pub Date : 2021-04-27 DOI: 10.1142/S0218301321500373
Y. Luo, J. Rasmussen, J. H. Hamilton, A. Ramayya, E. Wang, S. Frauendorf, W. Liang, C. Jiao, Q. Wu, H. Liu, F. Xu, Y. Liu, Yang Sun, J. K. Hwang, S. Liu, S. Zhu, N. Brewer, I. Lee, G. Ter-Akopian, Y. Oganessian, A. Daniel, R. Donangelo, W. Ma
Collective rotational bands were observed for the first time in neutron-rich odd–odd [Formula: see text]La by means of [Formula: see text]-[Formula: see text]-[Formula: see text] and [Formula: see text]-[Formula: see text]-[Formula: see text]-[Formula: see text] coincidence measurements of prompt fission [Formula: see text] rays from [Formula: see text]Cf using multi-detector array Gammasphere. Similarity between the yrast band of [Formula: see text]La and those of neighboring [Formula: see text]La, [Formula: see text]Ce was found and interpreted as quasiparticle excitations. PES calculations suggested triaxial deformation for the ground state of 142La. Considerable triaxial and near zero octupole deformations were deduced for the yrast band of [Formula: see text]La by the TRS model calculations. The band-crossing observed in the yrast band of [Formula: see text]La was interpreted to be caused by alignment of the (h[Formula: see text])2 proton pair, and the crossing frequency was best reproduced by the TRS calculations taking into account triaxial deformations. In contrast to the interpretations for the band crossing of [Formula: see text]La, alignments of the (i[Formula: see text])2 neutron pair were found to be responsible for the band-crossing of the yrast band in the neighboring even-N [Formula: see text]La, and triaxial degree of freedom was found to play a more significant role than octupole deformations in the nucleus, although its [Formula: see text] values deduced are large.
利用多探测器阵列Gammasphere,通过[公式:见文]-[公式:见文]-[公式:见文]-[公式:见文]和[公式:见文]-[公式:见文]-[公式:见文]-[公式:见文]-[公式:见文]-[公式:见文]对来自[公式:见文]Cf的瞬发裂变[公式:见文]射线的重合测量,首次在富中子奇奇[公式:见文]La中观测到集体旋转带。发现[公式:见文]La与相邻[公式:见文]La、[公式:见文]Ce的激发态具有相似性,并将其解释为准粒子激发。PES计算表明142La基态存在三轴变形。通过TRS模型计算,推导出[公式:见文]La的最后一段有相当大的三轴和近零的八极变形。在[公式:见文]La的yast波段观察到的带交叉被解释为(h[公式:见文])2质子对的排列引起的,并且交叉频率通过考虑三轴变形的TRS计算得到最好的再现。与对[公式:见文]La的能带穿越的解释相反,发现(i[公式:见文])2中子对的排列对相邻的偶n[公式:见文]La的带穿越负责,并且发现三轴自由度比核中的八极变形起更重要的作用,尽管其[公式:见文]推导的值很大。
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引用次数: 0
Octupole correlations in 127I 127I的八极相关
Pub Date : 2021-04-12 DOI: 10.1142/S0218301321500300
Sandip Chakraborty, H. Sharma, S. Tiwary, C. Majumder, A. Gupta, A. Kumar, P. Banerjee, S. Ganguly, Satish Kumar, R. Singh, S. Muralithar
In-beam [Formula: see text]-ray spectroscopy of [Formula: see text]I was carried out following [Formula: see text]Sn(7Li, 4n[Formula: see text]) fusion-evaporation reaction at a beam energy of 33 MeV. Ratio of the electric dipole (E1) and electric quadrupole (E2) transition probabilities [B(E1)/B(E2)] for the transitions depopulating from the [Formula: see text] states have been extracted from this study. Existence of enhanced E1 transition rates between the opposite parity bands, associated dominantly with [Formula: see text] and [Formula: see text] configurations, provides an indication of octupole correlations in this nucleus
束流内[公式:见文]-[公式:见文]的射线光谱学进行了[公式:见文]Sn(7Li, 4n[公式:见文])在33 MeV束流能量下的聚变蒸发反应。从本研究中提取了从[公式:见文]状态减少的跃迁的电偶极子(E1)和电四极子(E2)跃迁概率的比值[B(E1)/B(E2)]。相反宇称带之间存在增强的E1跃迁率,主要与[公式:见文]和[公式:见文]构型相关,这表明该核中存在八极相关
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引用次数: 0
The p +9Be elastic scattering below 30MeV: Optical model analysis and data normalization 30MeV以下p +9Be弹性散射:光学模型分析与数据归一化
Pub Date : 2021-04-10 DOI: 10.1142/S0218301321500245
H. M. Maridi, A. Pakou, K. Rusek
Differential cross-section data of elastic scattering for [Formula: see text]Be below a proton incident energy of 30[Formula: see text]MeV are evaluated by using two techniques. First, optical model analysis is performed and applied to the analyzing powers and reaction cross-sections to extract the optical potential parameters. Then, angular distributions of the differential cross-section are calculated with this potential and compared with the experimental data and normalization coefficients are extracted. Second, a consistent comparison between data sets with similar energies is considered in a minimization process to obtain another set of data normalization coefficients. The two techniques lead to similar normalized values for the existing data and consistently validate a body of low-energy data that can be safely used for further theoretical studies. Furthermore, the systematic behavior and energy dependence of the volume integral are determined as well as the energy dependence of the reaction cross-sections is predicted.
[公式:见文]在质子入射能量为30 MeV以下[公式:见文],用两种方法计算弹性散射的微分截面数据。首先,进行光学模型分析,并对分析功率和反应截面进行分析,提取光势参数;然后利用该势计算微分截面的角分布,并与实验数据进行比较,提取归一化系数。其次,在最小化过程中考虑具有相似能量的数据集之间的一致性比较,以获得另一组数据归一化系数。这两种技术对现有数据产生了相似的归一化值,并一致地验证了一系列低能量数据,这些数据可以安全地用于进一步的理论研究。此外,还确定了体积积分的系统行为和能量依赖关系,并预测了反应截面的能量依赖关系。
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引用次数: 2
Bound state solution of the Schrodinger equation for the Woods–Saxon potential plus coulomb interaction by Nikiforov–Uvarov and supersymmetric quantum mechanics methods 用Nikiforov-Uvarov和超对称量子力学方法求解Woods-Saxon势加库仑相互作用的薛定谔方程的束缚态解
Pub Date : 2021-04-10 DOI: 10.1142/S0218301321500233
E. Yazdankish
The generalized Woods–Saxon potential plus repulsive Coulomb interaction is considered in this work. The supersymmetry quantum mechanics method is used to get the energy spectrum of Schrodinger equation and also the Nikiforov–Uvarov approach is employed to solve analytically the Schrodinger equation in the framework of quantum mechanics. The potentials with centrifugal term include both exponential and radial terms, hence, the Pekeris approximation is considered to approximate the radial terms. By using the step-by-step Nikiforov–Uvarov method, the energy eigenvalue and wave function are obtained analytically. After that, the spectrum of energy is obtained by the supersymmetry quantum mechanics method. The energy eigenvalues obtained from each method are the same. Then in special cases, the results are compared with former result and a full agreement is observed. In the [Formula: see text]-state, the standard Woods–Saxon potential has no bound state, but with Coulomb repulsive interaction, it may have bound state for zero angular momentum.
本文考虑了广义Woods-Saxon势和排斥性库仑相互作用。利用超对称量子力学方法得到薛定谔方程的能谱,并利用Nikiforov-Uvarov方法在量子力学框架下解析求解薛定谔方程。具有离心项的势包括指数项和径向项,因此,Pekeris近似被认为是近似径向项。采用Nikiforov-Uvarov分步法,解析得到能量特征值和波函数。然后,用超对称量子力学方法得到了能量谱。每种方法得到的能量特征值是相同的。在特殊情况下,将计算结果与原计算结果进行了比较,结果与原计算结果完全吻合。在[公式:见文]-态中,标准Woods-Saxon势没有束缚态,但在库仑斥力作用下,它可能在角动量为零时具有束缚态。
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引用次数: 0
Interplay of Coulomb and symmetry potential in peak fragment production in asymmetric collisions 非对称碰撞中峰值碎片产生过程中库仑和对称势的相互作用
Pub Date : 2021-04-07 DOI: 10.1142/S0218301321500221
Sakshi Sharma, Rohit Kumar, S. Gautam, R. Puri
Role of the nuclear symmetry potential and Coulomb potential is explored on the peak energy of intermediate mass fragments ([Formula: see text]) and on peak multiplicity ([Formula: see text]) and their dependence on mass asymmetry of the reaction is also investigated. The calculations are done using Isospin-dependent Quantum Molecular Dynamics (IQMD) model. We also showed that the momentum-dependent interactions have uniform effects of [Formula: see text] and these effects are independent of mass asymmetry of the reaction. Further, we see that isospin effects that enter through the Coulomb and symmetry potential show much significant role as one increases the mass asymmetry of reaction. Mass asymmetric reactions thus serve a sensitive tool to investigate the nuclear symmetry energy effects.
探讨了核对称势和库仑势对中间质量碎片的峰值能量([公式:见文])和峰值多重度([公式:见文])的作用,以及它们对反应质量不对称性的依赖关系。利用同位旋相关量子分子动力学(IQMD)模型进行计算。我们还表明,动量依赖的相互作用具有均匀的影响[公式:见文本],这些影响与反应的质量不对称性无关。此外,我们看到,随着反应质量不对称性的增加,通过库仑势和对称势进入的同位旋效应显示出非常重要的作用。因此,质量不对称反应是研究核对称能效应的灵敏工具。
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引用次数: 0
Backward shower particle production in high energy nucleus–nucleus collisions — an outlook to centrality dependence 高能核-核碰撞中反向阵雨粒子的产生——对中心性依赖的展望
Pub Date : 2021-04-01 DOI: 10.1142/S0218301321500324
S. Bhattacharyya
A detailed study on the centrality dependence of the different aspects multiplicity distribution of the shower particles produced in the backward direction ([Formula: see text] in nuclear emulsion track detector has been carried out for [Formula: see text]Ne-emulsion interactions at 4.1 AGeV/c. Depending on the values of the total charges or sum of the charges of noninteracting projectile fragments, event samples were classified into four centrality classes. From the analysis presented in this paper, qualitative information about the assembly of shower particles in the backward direction has been extracted.
在4.1 AGeV/c条件下,对核乳化液径迹探测器中反向产生的([公式:见文])淋粒状物的不同方面多重分布的中心性依赖性进行了详细研究。根据非相互作用弹丸碎片的总电荷值或电荷之和,将事件样本分为四个中心性类。从本文的分析中,提取了雨粒子流反向聚集的定性信息。
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引用次数: 1
期刊
International Journal of Modern Physics E-nuclear Physics
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