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Study on open charm hadron production and angular correlation in high-energy nuclear collisions

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nuclear Science and Techniques 2021年第1期32卷 10-16页

作者： Hai Wang Jin-Hui Chen key laboratory of nuclear physics and ion-beam application(MOE) Fudan UniversityShanghai 200433China

We study the production and angular correlationof charm hadrons in hot and dense matter produced in high-energy nuclear-nuclear collisions within a multiphasetransport model(AMPT).By triggering additional charm-anticharm quark pair production in the AMPT,the modeldescribes the D^0 nuclear modification factor in the low andintermediate pr regions in Au+Au collisions at√VSNN=200 GeV reasonably *** exploration of the D^0 pair azimuthal angular correlation for different centralitiesshows clear evolution from low-multiplicity to high-mul-tiplicity events,which is associated with the number ofcharm quark interactions with medium partons duringAMPT transport.

关键词： Heavy-ion collision Heavy flavor nuclear modification factor Two-particle correlations

Anisotropy flows in Pb-Pb collisions at LHC energies from parton scatterings with heavy quark trigger

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nuclear Science and Techniques 2022年第2期33卷 14-20页

作者： Hai Wang Jin-Hui Chen key laboratory of nuclear physics and ion-beam application(MOE) Institute of Modern PhysicsFudan UniversityShanghai 200433China

By implementing an additional heavy quark-antiquark pair production trigger in a multiphase transport(AMPT)model,we study the effect on anisotropy flows of identified particles with a focus on charged particles and quarkonium(J/ΨandΥ).A systematic increase in the collision rate for active partons in the AMPT model with such an implementation has been *** leads to a slight increase of identified particles anisotropy flows as a function of transverse momentum(pT)and rapidity,and gives a better description of the experimental data of elliptic flow toward larger *** approach provides an efficient way to study the heavy quark dynamics in the AMPT model at LHC energies.

关键词： Heavy-ion collision Quark-gluon plasma Quarkonium Collective flow

Measurements of absolute electron capture cross sections in He^(2+)–He and Ne^(8+)–O_(2'), N_(2'), CH_4 collisions

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nuclear Science and Techniques 2023年第10期34卷 126-135页

作者： Pu-Fang Ma Jia-Rong Wang Zi-Xiao Zhang Tian-Ming Meng Zi-Han Xia Bai-Hui Ren Long Wei Ke Yao Jun Xiao Ya-Ming Zou Bing-Sheng Tu Bao-Ren Wei Institute of Modern physics Department of Nuclear Science and TechnologyFudan UniversityShanghai 200433China key laboratory of nuclear physics and ion‑beam application(MOE) Fudan UniversityShanghai 200433China

The total absolute cross sections of single-and double-electron capture (SEC and DEC) in the collisions of He^(2+)with He and Ne^(8+)with O_(2),N_(2),and CH_(4) were studied in the energy ranges 3.5–50 keV/u and 2.8–40 keV/u,*** a deep analysis of the experimental systematic uncertainties in the measurement procedure and data evaluation,the error in the experimental results of the SEC cross sections is less than 9%.Within the uncertainties,the present results of the He^(2+)–He collision show good consistency with previous measurements,validating the experimental system and paving the way for precise measurements of EC cross sections for a variety of ions and neutral *** present measurements allow for a test of EC theory and provide crucial EC cross section data for the establishment of plasma models in fusion research and astrophysical X-ray studies.

关键词： Highly charged ions Cross section Electron capture Charge exchange

Determination of the resonant parameters of excited vector strangenia with e^(+)e^(-)→ηФdata

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Chinese physics C 2023年第11期47卷 23-33页

作者：朱文静王小龙 key laboratory of nuclear physics and ion-beam application Ministry of EducationShanghai 200443China Institute of Modern physics Fudan UniversityShanghai 200443China

We determine the resonant parameters of the vector statesϕ(1680)andϕ(2170)by performing a combined fit to the e+e−→ηϕcross sections from the threshold to 2.85GeV measured by the BaBar,Belle,BESIII,and CMD-3 *** mass(1678_(−3)^(+5)±7)MeV/c^(2) and width(156±5±9)MeV are obtained forϕ(1680),and the mass(2169±5±6)MeV/c^(2) and width(96_(−14)^(+17)±9)MeV are obtained forϕ(2170).The statistical significance ofϕ(2170)is 7.2σ.Depending on the interference betweenϕ(1680),ϕ(2170),and a non-resonantηϕamplitude in the nominal fit,we obtain four solutions andΓe+e−ϕ(1680)⋅B[ϕ(1680)→ηϕ]=(79±4±16),(127±5±12),(65_(−4)^(+5)±13)or(215_(−5)^(+8)±11)eV,andΓ_(ϕ(2170))^(e+e−)⋅B[ϕ(2170)→ηϕ]=(0.56_(−0.02)^(+0.03)±0.07),(0.36_(−0.03)^(+0.05)±0.07),(38±1±5)or(41±2±6)*** also search for the production of X(1750)→ηϕ,and the significance is only 2.0σ.We then determine the upper limit ofΓ_(X(1750))^(e+e−)⋅B[X(1750)→ηϕ]at the 90%confidence level.

关键词： strangenia resonant parameters Ф(2170) Ф(1680) cross section

Gamma-,neutron-,and muon-induced environmental background simulations for 100Mo-based bolometric double-beta decay experiment at Jinping Underground laboratory

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nuclear Science and Techniques 2023年第9期34卷 50-57页

作者： Wei Chen Long Ma Jin-Hui Chen Huan-Zhong Huang key laboratory of nuclear physics and ion-beam application(MOE) Institute of Modern PhysicsFudan UniversityShanghai 200433China University of California Los AngelesCA 90095USA

The sensitivity of an experiment to detect the Majorana neutrino mass via neutrinoless double-beta decay(0νββ) strongly depends on the rate of background events that can mimic this decay. One major source of this background is the radioactive emissions from the laboratory environment. In our study, we focused on assessing the background contributions from environmental gamma rays, neutrons, and underground muons to the Jinping bolometric demonstration experiment. This experiment uses an array of lithium molybdate crystal bolometers to probe the potential 0νββ decay of the100Mo isotope at the China Jinping Underground laboratory. We also evaluated the shielding effectiveness of the experimental setup through an attenuation study. Our simulations indicate that the combined background from environmental gamma rays, neutrons, and muons in the relevant100Mo 0νββ Q-value region can be reduced to approximately 0.003 cts/kg/keV/yr.

关键词： Neutrinoless double-beta decay Geant4 CUPID

Recent progress in two-proton radioactivity

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nuclear Science and Techniques 2022年第8期33卷 118-146页

作者： Long Zhou Si-Min Wang De-Qing Fang Yu-Gang Ma key laboratory of nuclear physics and ion-beam application(MOE) Institute of Modern PhysicsFudan UniversityShanghai 200433China Shanghai Research Center for Theoretical nuclear physics NSFC and Fudan UniversityShanghai 200438China

During the last few decades,rare isotope beam facilities have provided unique data for studying the properties of nuclides located far from the beta-stability *** nuclei are often accompanied by exotic structures and radioactive modes,which represent the forefront of nuclear *** them,two-proton(2p)radioactivity is a rare decay mode found in a few highly proton-rich *** 2p decay lifetimes and properties of emitted protons hold invaluable information regarding the nuclear structures in the presence of a low-lying proton continuum;as such,they have attracted considerable research *** this review,we present some of the recent experimental and theoretical progress regarding the 2p decay,including technical innovations for measuring nucleon-nucleon correlations and developments in the models that connect their structural aspects with their decay *** impressive progress should play a significant role in elucidating the mechanism of these exotic decays,probing the corresponding components inside nuclei,and providing deep insights into the open quantum nature of dripline systems.

关键词： Exotic decay Two-proton radioactivity Nucleon-nucleon correlation Experimental and theoretical development

Spin polarization formula for Dirac fermions at local equilibrium

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Science China(physics,Mechanics & Astronomy) 2022年第7期65卷 121-128页

作者： Yu-Chen Liu Xu-Guang Huang physics Department and Center for Field Theory and Particle physics Fudan UniversityShanghai 200433China key laboratory of nuclear physics and ion-beam application(MOE) Fudan UniversityShanghai 200433China

We derive a Cooper-Frye type spin polarization formula for Dirac fermions at local thermal equilibrium described by a grand canonical ensemble specified by temperature, fluid velocity, chemical potential, and spin potential. We discuss the physical meaning of different contributions to spin polarization and compare them with previous work. The present formula provides machinery to convert the spin potential computed in, e.g., relativistic spin hydrodynamics to the spin polarization observable in,e.g., heavy-ion collisions.

关键词： spin polarization local equilibrium spin kinetic theory

Neutron skin and its effects in heavy-ion collisions

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nuclear Science and Techniques 2024年第12期35卷 217-238页

作者： Meng‑Qi Ding De‑Qing Fang Yu‑Gang Ma key laboratory of nuclear physics and ion‑beam application(MOE) Institute of Modern PhysicsFudan University200433 ShanghaiChina Shanghai Research Center for Theoretical nuclear physics NSFC and Fudan University200438 ShanghaiChina

Neutron skin is an exotic phenomenon that occurs in unstable *** this study,the various efects of the neutron skin on nuclear reactions and their relationship with the properties of nuclear structures are *** on numerous studies using theoretical models,strong correlations have been found between the neutron skin thickness and the neutron removal cross section,neutron/proton yield ratio,t∕3He yield ratio,neutron-proton momentum diference,isoscaling parameter,photon production,reaction cross sections for neutron-induced reactions,charge-changing cross-sectional diferences of mirror nuclei,astrophysical S-factor,and other quantities in nuclear reactions induced by neutron-rich ***,the relationships between the neutron skin thickness and certain properties of the nuclear structure,such asα-cluster formation,αdecay,nuclear surface,nuclear temperature,and proton radii diference of mirror nuclei,have also been ***,it has also been shown that the neutron skin plays a crucial role in relativistic heavy-ion ***,an unstable nucleus with a neutron skin can be generated by radioactive nuclear beam facilities,and the thickness of the neutron skin can be extracted by measuring the sensitive probes,which further helps impose stringent constraints on the equation of state of asymmetric nuclear matter and the properties of neutron stars.

关键词： Neutron skin Radioactive nuclear beam Equation of state of asymmetric nuclear matter

A surface engineering strategy for the stabilization of zinc metal anodes with montmorillonite layers toward long-life rechargeable aqueous zinc ion batteries

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Journal of Energy Chemistry 2025年第1期100卷 94-105页

作者： Wenbo Wang Ruifeng Xu Xu Zhang Peiyu Wang Bao Yang Bingjun Yang Juan Yang Kailimai Su Pengjun Ma Yanan Deng Xianfeng Fan Wanjun Chen key laboratory for Electronic Materials College of Electrical Engineering Northwest Minzu University Resource Chemistry and Energy Materials Research Center State Key Laboratory of Solid Lubrication Lanzhou Institute of Chemical Physics Chinese Academy of Sciences University of Chinese Academy of Sciences Institute for Materials and Processes School of Engineering University of Edinburgh

Rechargeable aqueous zinc-ion batteries （AZIBs） exhibit appreciable potential in the domain of electrochemical energy ***,there are serious challenges for AZIBs,for instance zinc dendrite growth,hydrogen evolution reaction （HER）,and corrosion side ***,we propose a surface engineering modification strategy for coating the montmorillonite （MMT） layer onto the surface of the Zn anode to tackle these issues,thereby achieving high cycling stability for rechargeable *** results reveal that the MMT layer on the surface of the Zn anode is able to provide ordered zincophilic channels for zinc ions migration,facilitating the reaction kinetics of zinc *** functional theory（DFT） calculations and water contact angle （CA） tests prove that MMT@Zn anode exhibits superior adsorption capacity for Zn2+and better hydrophobicity than the bare Zn anode,thereby achieving excellent cycling ***,the MMT@Zn||MMT@Zn symmetric cell holds the stable cycling over 5600 h at 0.5 mA cm-2and 0.125 m A h cm-2,even exceeding 1800 h long cycling under harsh conditions of 5 m A cm-2and 1.25 m A h *** MMT@Zn||V2O5full cell reaches over 3000 cycles at 2 A g-1with excellent rate ***,this surface engineering modification strategy for enhancing the electrochemical performance of AZIBs represents a promising application.

关键词： Surface engineering strategy Montmorillonite layer Protection mechanism of Zn anode Cycling stability Aqueous zinc ion batteries