Journal of Physics G最新文献_第10页

Cross-section, vector and tensor analyzing powers of the 6 Li + 12 C elastic scattering at 30 and 50 MeV: a non-monotonic potential description 30和50 MeV下6 Li + 12c弹性散射的截面、矢量和张量分析能力:一个非单调势描述

Journal of Physics G Pub Date : 2020-05-11 DOI: 10.1088/1361-6471/ab920b

A. Nilima, S. Hossain, M. M. Azad, M. Billah, A. Tariq, A. Basak

引用次数: 2

Possible ‘stapler’ band in 109Ag nucleus 109Ag核中可能存在“订书机”带

Journal of Physics G Pub Date : 2020-05-11 DOI: 10.1088/1361-6471/ab920c

K. Ma, J. B. Lu, J. Li, D. Yang, Y. J. Ma, W. J. Sun, J. Wang, Q. Yang, H. Wang, H. Pan, D. Zhang, L. Zhu, X. G. Wu, Y. Zheng, C. Li

{"title":"Possible ‘stapler’ band in 109Ag nucleus","authors":"K. Ma, J. B. Lu, J. Li, D. Yang, Y. J. Ma, W. J. Sun, J. Wang, Q. Yang, H. Wang, H. Pan, D. Zhang, L. Zhu, X. G. Wu, Y. Zheng, C. Li","doi":"10.1088/1361-6471/ab920c","DOIUrl":"https://doi.org/10.1088/1361-6471/ab920c","url":null,"abstract":"High-spin states of 109Ag have been studied using the 7Li + 110Pd reaction at a beam energy of 46 MeV. A new negative-parity band decaying to the ground-state band by several new linking transitions is established. Meanwhile, seven new E2 crossover transitions of this band are observed, thereby confirming the spin-parity assignment and ordering of the dipole transitions above the Iπ = 19/2- level. A low energy γ-ray transition of 88 keV is found and placed at the bottom of the negative-parity band, and thus the Iπ = 17/2- level is tentatively assigned as the lowest observed state of this band. Experimental excitation energies and total angular momenta of the negative-parity band are compared with the predictions of self-consistent titled axis cranking relativistic mean-field theory with a three-quasiparticle configuration of πg9/2 -1 νh11/2(g7/2/d5/2)-1. Based on the theoretical description and the analyses of the angular momentum coupling, this negative-parity dipole band is suggested as a ``stapler'' band. By investigating the angular momentum components, it is found that the valence nucleons in the low-j orbitals play an active role in the ``stapler'' mechanism.","PeriodicalId":16770,"journal":{"name":"Journal of Physics G","volume":"24 1","pages":"085106"},"PeriodicalIF":0.0,"publicationDate":"2020-05-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81574181","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

First order dissipative hydrodynamics and viscous corrections to the entropy four-current from an effective covariant kinetic theory 一阶耗散流体力学和从有效协变动力学理论对熵四流的粘性修正

Journal of Physics G Pub Date : 2020-05-05 DOI: 10.1088/1361-6471/ab907b

Samapan Bhadury, Manu Kurian, V. Chandra, A. Jaiswal

{"title":"First order dissipative hydrodynamics and viscous corrections to the entropy four-current from an effective covariant kinetic theory","authors":"Samapan Bhadury, Manu Kurian, V. Chandra, A. Jaiswal","doi":"10.1088/1361-6471/ab907b","DOIUrl":"https://doi.org/10.1088/1361-6471/ab907b","url":null,"abstract":"The first order hydrodynamic evolution equations for the shear stress tensor, the bulk viscous pressure and the charge current have been studied for a system of quarks and gluons, with a non-vanishing quark chemical potential and finite quark mass. The first order transport coefficients have been obtained by solving an effective Boltzmann equation for the grand-canonical ensemble of quasiquarks and quasigluons. We adopted temperature dependent effective fugacity for the quasiparticles to encode the hot QCD medium effects. The non-trivial energy dispersion of the quasiparticles induces mean field contributions to the transport coefficients whose origin could be directly related to the realization of conservation laws from the effective kinetic theory. Both the QCD equation of state and chemical potential are seen to have a significant impact on the quark-gluon plasma evolution. The shear and bulk viscous corrections to the entropy-four current have been investigated in the framework of the effective kinetic theory. The effect of viscous corrections to the entropy density have been quantified in the case of one dimensional boost-invariant expansion of the system. Further, the first order viscous corrections to the time evolution of temperature along with the description of pressure anisotropy and Reynolds number of the system have been explored for the longitudinal boost-invariant expansion.volution of temperature along with the description of pressure anisotropy of the system have also been explored.","PeriodicalId":16770,"journal":{"name":"Journal of Physics G","volume":"11 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-05-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81128259","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: 8

Density dependence of the symmetry energy constrained by β −-, 2β −-, and 4β −-decay energies β -、2β -和4β -衰变能约束下对称能的密度依赖性

Journal of Physics G Pub Date : 2020-05-01 DOI: 10.1088/1361-6471/ab7985

Niu Wan, Xu, Xin Zhang

引用次数: 1

Multinucleon transfer reaction from view point of dynamical dinuclear system method 从动力双核系统方法的角度看多核子转移反应

Journal of Physics G Pub Date : 2020-04-28 DOI: 10.1088/1361-6471/ab8dcc

P. Wen, A. Nasirov, Chengjian Lin, H. Jia

{"title":"Multinucleon transfer reaction from view point of dynamical dinuclear system method","authors":"P. Wen, A. Nasirov, Chengjian Lin, H. Jia","doi":"10.1088/1361-6471/ab8dcc","DOIUrl":"https://doi.org/10.1088/1361-6471/ab8dcc","url":null,"abstract":"The dinuclear system (DNS) model is widely used to explain different heavy-ion reactions such as fusion, quasifission and fission. In previous studies, the DNS is treated as a local $N/Z$ equilibrium system formed after the capture process in the final stage of the reaction. In this work, we generalize the DNS concept to describe the multi-nucleon transfer (MNT) reaction in the dynamical radial process. By treating the ensemble of projectile and target at any distance as the dinuclear system, we solve the semi-classical dynamical radial equation and the master equation for the proton and neutron distributions in the dinuclear system (DyDNS) simultaneously for the first time. In this method, the classical radial movement is coupled with the internal quantum single particle transition between the colliding nuclei. The dynamical Monte Carlo method is engaged to simulate the solutions, and then the GEMINI++ model is adopted to deal with the de-excitations. To illustrate the validity of our approach, the MNT reaction ${}^{136}$Xe+${}^{208}$Pb has been re-examined. The obtained results demonstrate a better agreement with the available experimental data than the calculations of the GRAZING model, especially for the transfer of many nucleons.","PeriodicalId":16770,"journal":{"name":"Journal of Physics G","volume":"21 1","pages":"075106"},"PeriodicalIF":0.0,"publicationDate":"2020-04-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82014789","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: 12

Determination of the cross-section for (n,p) and (n,α) reactions on 153Eu at neutron energies from 13 to 15 MeV 中子能量为13 ~ 15mev的153Eu上(n,p)和(n，α)反应截面的测定

Journal of Physics G Pub Date : 2020-04-27 DOI: 10.1088/1361-6471/ab8d8f

Junhua Luo, Li Jiang, Le Shan, Liang Zhou

引用次数: 3

Lorentz violation effects in 2νββ decay 2νββ衰变中的洛伦兹破坏效应

Journal of Physics G Pub Date : 2020-04-09 DOI: 10.1088/1361-6471/ab7e8c

O. Niţescu, S. Ghinescu, S. Stoica

{"title":"Lorentz violation effects in 2νββ decay","authors":"O. Niţescu, S. Ghinescu, S. Stoica","doi":"10.1088/1361-6471/ab7e8c","DOIUrl":"https://doi.org/10.1088/1361-6471/ab7e8c","url":null,"abstract":"Observable effects for the Lorentz invariance violation (LIV) at a low energy scale can also be investigated in double beta decay (DBD). For example, by comparing the theoretical predictions with a precise analysis of the summed energy spectra of electrons in $2nubetabeta$ decay, one can constrain the $mathring{a}_{of}^{(3)}$ coefficient that governs the time-like component of the Lorentz invariance violating operator that appears in the Standard Model extension theory. In this work, we perform calculations of the phase space factors and summed energy spectra of electrons as well as of their deviations due to LIV necessary in such experimental investigations. The Fermi functions needed in the calculation are built up with exact electron wave functions obtained by numerically solving the Dirac equation in a realistic Coulomb-type potential with the inclusion of the finite nuclear size and screening effects. We compared our results with those used in previous LIV investigations that were obtained with approximate (analytical) Fermi functions and found differences of up to $30%$ for heavier nuclei. Our work includes eight experimentally interesting nuclei. Next, we estimate and discuss the uncertainties of our calculations associated with uncertainties in Q-values measurements and the differences raised from the inclusion of the kinematic terms in the formalism. Finally, we provide the ratio between the standard phase space factors and their LIV deviations and the energies where the LIV effects are expected to be maximal. We expect our study to be useful in the current LIV investigations in $2nubetabeta$ decay and to lead to improved constraints on the $mathring{a}_{of}^{(3)}$ coefficient.","PeriodicalId":16770,"journal":{"name":"Journal of Physics G","volume":"9 3 1","pages":"055112"},"PeriodicalIF":0.0,"publicationDate":"2020-04-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77563740","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: 6

Fermion mass and mixing in the $U{(1)}_{B-L}$ extension of the standard model with D 4 symmetry 具有d4对称的标准模型的$U{(1)}_{B-L}$扩展中的费米子质量和混合

Journal of Physics G Pub Date : 2020-04-08 DOI: 10.1088/1361-6471/ab7ec0

V. V. Vien

引用次数: 17

System size dependence of final state hadron sources at E lab = 3.7 A GeV 电子实验室末态强子源的系统大小依赖性= 3.7 A GeV

Journal of Physics G Pub Date : 2020-04-01 DOI: 10.1088/1361-6471/ab5d92

A. Abdelsalam, M. El–Nagdy, B. Badawy, A. Saber

{"title":"System size dependence of final state hadron sources at E lab = 3.7 A GeV","authors":"A. Abdelsalam, M. El–Nagdy, B. Badawy, A. Saber","doi":"10.1088/1361-6471/ab5d92","DOIUrl":"https://doi.org/10.1088/1361-6471/ab5d92","url":null,"abstract":"3.7A GeV 4He, 16O, and 32S beams from Dubna Synchrophasotron interacting in nuclear emulsion are used. The final state hadrons are approached by the produced shower particles. The dependence on the system size is examined. The data are discriminated according to the emission in the forward and backward zones over the 4p space. Minimum biased samples of events corresponding to average impact parameters are selected randomly. The data are compared to a simulation based on the modified FRITIOF event generator, implementing the Lund model string dynamics. The multiplicity characteristics present an overview of the parameters obtained when the distributions are fitted by the multisource thermal model. The forward emitted shower particles are suggested to be created in hadronization system due to multisource superposition. The backward emitted ones mostly result from target nucleus decay source in the framework of the limiting fragmentation hypothesis. Empirical parameterizations based primarily on fitting procedures are undertaken to fulfill the universality of some uniform relationships. Systematic uncertainties are estimated in terms of standard deviation within errors.","PeriodicalId":16770,"journal":{"name":"Journal of Physics G","volume":"16 1","pages":"045103"},"PeriodicalIF":0.0,"publicationDate":"2020-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88751479","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

Investigating the effects of the phenomenological parameters changes in the final state interaction 考察了现象学参数变化对终态相互作用的影响

Journal of Physics G Pub Date : 2020-04-01 DOI: 10.1088/1361-6471/ab6af6

B. Mohammadi, Akbar Abdisaray

引用次数: 0