Journal of Physics G最新文献_第6页

Enhanced α α-particle production from fusion evaporation reactions leading to 46Ti 熔融蒸发反应增强α α-粒子生成，导致46Ti

Journal of Physics G Pub Date : 2021-02-12 DOI: 10.1088/1361-6471/ABE5F6

M. Cicerchia, F. Gramegna, D. Fabris, M. Cinausero, T. Marchi, Giuseppe Andreetta, S. Barlini, M. Bini, R. Bolzonella, M. Bruno, A. Buccola, A. Caciolli, A. Camaiani, G. Casini, N. Cieplicka-Oryńczak, G. Collazuol, M. D'Agostino, M. Degerlier, D. Dell’Aquila, L. Domenichetti, B. Fornal, C. Frosin, N. Gelli, D. Gruyer, V. Kravchuk, S. Leoni, I. Lombardo, J. Mabiala, M. Managlia, G. Mantovani, D. Mengoni, L. Morelli, A. Olmi, P. Ottanelli, G. Pasquali, G. Pastore, S. Piantelli, L. Scomparin, S. Valdré, G. Verde

引用次数: 4

Investigation of the nuclear liquid-gas phase transition in the static AMD 静态AMD中核液气相变的研究

Journal of Physics G Pub Date : 2021-02-11 DOI: 10.1088/1361-6471/abe563

Weiping Lin, P. Ren, Xing-Quan Liu, Hua Zheng, Meirong Huang, G. Qu, Wada Roy

{"title":"Investigation of the nuclear liquid-gas phase transition in the static AMD","authors":"Weiping Lin, P. Ren, Xing-Quan Liu, Hua Zheng, Meirong Huang, G. Qu, Wada Roy","doi":"10.1088/1361-6471/abe563","DOIUrl":"https://doi.org/10.1088/1361-6471/abe563","url":null,"abstract":"Nuclear liquid-gas phase transitions are investigated in the framework of static antisymmetrized molecular dynamics (static AMD) model under either a constant volume or a constant pressure. A deuteron quadrupole momentum fluctuation thermometer is applied to extract the temperature of fragmenting systems of Ar and Sn. A plateau structure of caloric curves is observed under a constant volume for those system with a density ρ ≤ 0.03 fm−3. A clear backbending in the caloric curves, which indicates a first order phase transition, is observed under a constant pressure with all pressures studied. The similar behavior of caloric curves of Ar and Sn systems indicates that there is no strong system size effect under a constant volume or a constant pressure. Both the mass distributions and the light particle multiplicities show a strong α clusterization at low excitation energies in the static AMD simulations. The liquid-gas phase transition measures of the multiplicity derivative (dM/dT) and the normalized variance of Zmax (NVZ) are applied. The experimental caloric curves are also compared with those of Sn of the static AMD simulations under both the constant volume and the constant pressure conditions. Discussions are presented with the available experimental results and those from the static AMD simulations. Large errors in the experimental temperature measurements and those in the reconstruction technique for the primary fragmenting source hinder to draw a conclusion whether the phase transition occurs under either a constant volume or a constant pressure. This study suggests that different measures for the liquid-gas phase transitions should be examined besides the caloric curves in order to draw a conclusion.","PeriodicalId":16770,"journal":{"name":"Journal of Physics G","volume":"47 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-02-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90259849","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

Prediction of half-lives of even–even superheavy nuclei 甚至超重核的半衰期预测

Journal of Physics G Pub Date : 2021-02-02 DOI: 10.1088/1361-6471/ABE281

Deepika Pathak, N. Singh, H. Kaur, S. Jain

引用次数: 3

Nucleon scattering analysis with a lane-consistent dispersive optical potential for Hf, W and Ta isotopes 核子散射分析与通道一致色散光势的Hf, W和Ta同位素

Journal of Physics G Pub Date : 2021-02-02 DOI: 10.1088/1361-6471/ABE280

Xiuniao Zhao, Weili Sun, E. Soukhovitskiĩ, D. S. Martyanov, J. Quesada, R. Capote

引用次数: 1

An evidence of triple kinetic freezeout scenario observed in all centrality intervals in Cu-Cu, Au-Au and Pb-Pb collisions at high energies 在高能Cu-Cu、Au-Au和Pb-Pb碰撞中，在所有中心间隔观察到三重动力学冻结情景的证据

Journal of Physics G Pub Date : 2021-01-19 DOI: 10.1088/1361-6471/abdd8d

M. Waqas, G. Peng, Fu-Hu Liu

{"title":"An evidence of triple kinetic freezeout scenario observed in all centrality intervals in Cu-Cu, Au-Au and Pb-Pb collisions at high energies","authors":"M. Waqas, G. Peng, Fu-Hu Liu","doi":"10.1088/1361-6471/abdd8d","DOIUrl":"https://doi.org/10.1088/1361-6471/abdd8d","url":null,"abstract":"Transverse momentum spectra of $pi^+$, $K^+$, $p$, $K^0_s$, $Lambda$, $Xi$ or $barXi^+$ and $Omega$ or $barOmega^+$ or $Omega+barOmega$ in Copper-Copper (Cu-Cu), Gold-Gold (Au-Au) and Lead-Lead (Pb-Pb) collisions at 200 GeV, 62.4 GeV and 2.76 TeV respectively, are analyzed in different centrality bins by the blast wave model with Tsallis statistics. The model results are approximately in agreement with the experimental data measured by BRAHMS, STAR and ALICE Collaborations in special transverse momentum ranges. Kinetic freeze out temperature, transverse flow velocity and kinetic freezeout volume are extracted from the transverse momentum spectra of the particles. It is observed that $barXi^+$ and $Omega$ or $barOmega^+$ or $Omega+barOmega$ have larger kinetic freezeout temperature followed by $K^+$, $K^0_s$ and $Lambda$ than $pi^+$ and $p$ due to smaller reaction cross-sections of multi-strange and strange particles than non-strange particles. The present work reveals the scenario of triple kinetic freezeout in collisions at BRAHMS, STAR and ALICE Collaborations, however the transverse flow velocity and kinetic freezeout volume are mass dependent and they decrease with the increasing rest mass of the particle. In addition, the kinetic freezeout temperature, transverse flow velocity and kinetic freezeout volume are decreasing from central to peripheral collisions while the parameter q increase from central to peripheral collisions, indicating the approach of quick equilibrium in the central collisions. Besides, the kinetic freezeout temperature and kinetic freezeout volume are observed to be larger in larger collision system which shows its dependence on the size of the interacting system, while transverse flow velocity increase with increasing energy.","PeriodicalId":16770,"journal":{"name":"Journal of Physics G","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-01-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79920456","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: 24

Nature of potential families from elastic 16O + 16O rainbow scattering* 来自弹性16O + 16O彩虹散射的潜在族的性质*

Journal of Physics G Pub Date : 2021-01-05 DOI: 10.1088/1361-6471/abd88e

M. Islam, R. A. Ramon, M. Rahman, R. Majumder, M. A. Sayed, A. Nilima, M. M. Azad, A. Tariq, M. A. Uddin, A. Basak

引用次数: 0

Scalar dark matter, neutrino mass and leptogenesis in a U(1) B−L model U(1) B−L模型中的标量暗物质、中微子质量和轻生现象

Journal of Physics G Pub Date : 2021-01-04 DOI: 10.1088/1361-6471/abd83f

Subhasmita Mishra, S. Singirala, S. Sahoo

{"title":"Scalar dark matter, neutrino mass and leptogenesis in a U(1)\u0000 B−L\u0000 model","authors":"Subhasmita Mishra, S. Singirala, S. Sahoo","doi":"10.1088/1361-6471/abd83f","DOIUrl":"https://doi.org/10.1088/1361-6471/abd83f","url":null,"abstract":"We investigate the phenomenology of singlet scalar dark matter in a simple $rm U(1)_{B-L}$ gauge extension of standard model, made anomaly free with four exotic fermions. The enriched scalar sector and the new gauge boson $Z^prime$, associated with $rm U(1)$ gauge extension, connect the dark sector to the visible sector. We compute relic density, consistent with Planck limit and $Z^prime$ mediated dark matter-nucleon cross section, compatible with PandaX bound. The mass of $Z^prime$ and the corresponding gauge coupling are constrained from LEP-II and LHC dilepton searches. We also briefly scrutinize the tree level neutrino mass with dimension five operator. Furthermore, resonant leptogenesis phenomena is discussed with TeV scale exotic fermions to produce the observed baryon asymmetry of the Universe. Further, we briefly explain the impact of flavor in leptogenesis and we also project the combined constraints on Yukawa, consistent with oscillation data and observed baryon asymmetry. Additionally, we restrict the new gauge parameters by using the existing data on branching ratios of rare $B(tau)$ decay modes. We see that the constraints from dark sector are much more stringent from flavor sector.","PeriodicalId":16770,"journal":{"name":"Journal of Physics G","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-01-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83849563","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: 5

Change in neutron skin thickness after cluster-decay 团簇衰变后中子蒙皮厚度的变化

Journal of Physics G Pub Date : 2020-12-09 DOI: 10.1088/1361-6471/abd233

W. Seif, A. R. Abdulghany, Z. Hussein

引用次数: 7

Optimization and supervised machine learning methods for fitting numerical physics models without derivatives 无导数数值物理模型拟合的优化和监督机器学习方法

Journal of Physics G Pub Date : 2020-12-02 DOI: 10.1088/1361-6471/abd009

Raghu Bollapragada, M. Menickelly, W. Nazarewicz, J. O'Neal, P. Reinhard, Stefan M. Wild

引用次数: 10

Lifetime measurements in 104Pd 寿命测量在104Pd

Journal of Physics G Pub Date : 2020-12-01 DOI: 10.1088/1361-6471/abb785

C. Majumder, H. Sharma, Sandip Chakraborty, S. Tiwary, R. Singh, S. Muralithar, I. Bala, S. Bhattacharjee, R. Garg, N. Rajput, Anupriya Sharma, P. V. M. Rao

引用次数: 2