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Production of light nuclei and hypernuclei at High Intensity Accelerator Facility energy region

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Nuclear Science and Techniques 2017年第4期28卷 84-90页

作者： Peng Liu Jin-Hui Chen Yu-Gang Ma Song Zhang Shanghai Institute of Applied Physics Chinese Academy of Sciences Shanghai 201800 China University of Chinese Academy of Sciences Beijing 100049 China

Heavy-ion collisions are powerful tools for studying hypernuclear *** develop a dynamical coalescence model coupled with an ART model(version1.0) to study the production rates of light nuclear clusters and hypernuclei in heavy-ion reactions,for instance,the deuteron(d),triton(t),helium(~3He),and hypertriton(_A^3H)in minimum bias(0-80%centrality)~6Li+^(12)C reactions at beam energy of 3.5A *** penalty factor for light clusters is extracted from the yields,and the distributions of 0 angle of particles,which provide direct suggesetions about the location of particle detectors in the near future facility-High Intensity heavy-ion Accelerator Facility(HIAF) are *** calculation demonstrates that HIAF is suitable for studying hypernuclear physics.

关键词： Heavy-ion accelerator facility Hyperon hypernuclei Coalescence Light nuclei

Production of Λ-hypernuclei in A(p,K^+)ΛB reactions

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Chinese Physics C 2008年第12期32卷 962-971页

作者：敬罕涛沈彭年姜焕清 Institute of High Energy Physics Chinese Academy of Sciences P.O.Box 918(4) Graduate University of Chinese Academy of Sciences Department of Physics Guangxi Normal University Institute of Theoretical Physics Chinese Academy of Sciences Center of Theoretical Nuclear Physics National Laboratory of Heavy Ion Accelerator of Lanzhou South-West University

The production of A-hypernuclei in the A（p,K^＋）AB reaction is investigated in the framework ofthe distorted wave impulse approximation（DWIA）. The total cross sections and differential cross sections for various nuclear targets are calculated with an elementary process pN → NKA where the additional contributions from the N（1535） resonance and the final state interaction between p and A are included. The dependence of the production cross sections of A-hypernuclei on the phenomenological nuclear density and the nucleon number in the target, as well as the distortion effect of the incident proton and outgoing kaon, are also explored. It is shown that the distortion effect tends to decrease the cross sections by a factor of about 3--10. The production cross sections are sensitive to the adopted nuclear density.

关键词： A production hypernuclei proton nucleus collisions

Recalibration of the binding energy of hypernuclei measured in emulsion experiments and its implications

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Chinese Physics C 2019年第12期43卷 38-46页

作者： Peng Liu Jinhui Chen Declan Keane Zhangbu Xu Yu-Gang Ma Shanghai Institute of Applied Physics Chinese Academy of SciencesShanghai 201800China University of Chinese Academy of Sciences Beijing 100049China Brookhaven National Laboratory UptonNew York 11973USA Key Laboratory of Nuclear Physics and Ion-beam Application(MOE) Institute of Modem PhysicsFudan UniversityShanghai 200433China Kent State University KentOhio 44242USA Shandong University QingdaoShandong 266237China

TheΛseparation energy forΛhypernuclei,denoted BΛ,measured in 1967,1968,and 1973 are recalibrated using the current best estimates of the mass of particles and *** recalibrated BΛare systematically larger(except in the case ofΛ~6He)than the originally published values by about 100 *** effect of this level of recalibration is very important for light hypemuclei,especially for the *** early BΛvalues measured in1967,1968,and 1973 are widely used in theoretical research,and the new results provide better constraints for the conclusions of such studies.

关键词： hypernuclei binding energy recalibration

Density-dependent relativistic mean field approach and its application to single-Λhypernuclei in oxygen hyperisotopes

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Chinese Physics C 2023年第12期47卷 102-114页

作者：丁士缘杨威孙保元 MOE Frontiers Science Center for Rare Isotopes Lanzhou UniversityLanzhou 730000China School of Nuclear Science and Technology Lanzhou UniversityLanzhou 730000China

The in-medium feature of nuclear force, which includes both nucleon-nucleon( NN) and hyperon-nucleon( ΛN) interactions, impacts the description of single-Λ hypernuclei. With the alternated mass number or isospin of hypernuclei, such effects may be unveiled by analyzing the systematic evolution of the bulk and single-particle properties. From a density-dependent meson-nucleon/hyperon coupling perspective, a new ΛN effective interaction in the covariant density functional(CDF) theory, namely, DD-LZ1-Λ1, is obtained by fitting the experimental data ofΛ separation energies for several single-Λ hypernuclei. It is then used to study the structure and transition properties of single-Λ hypernuclei in oxygen hyperisotopes, in comparison with those determined using several selected CDF Lagrangians. A discrepancy is explicitly observed in the isospin evolution of Λ1p spin-orbit splitting with various effective interactions, which is attributed to the divergence of the meson-hyperon coupling strengths with increasing density. In particular, the density-dependent CDFs introduce an extra contribution to reduce the value but enhance the isospin dependence of the splitting, which originates from the rearrangement terms of Λ self-energies. In addition, the characteristics of hypernuclear radii are studied along the isotopic chain. Owing to the impurity effect of theΛ hyperon, a size shrinkage is observed in the matter radii of hypernuclei compared with the cores of normal nuclei,and its magnitude is further elucidated to correlate with the incompressibility of nuclear matter. Moreover, there is a sizable model-dependent trend in which the Λ hyperon radii evolve with neutron number, which is decided partly by the in-medium NN interactions and core polarization effects.

关键词： relativistic mean field theory hypernuclei oxygen isotopes covariant density functional theory

Dynamical Structure of A≤4 hypernuclei and Charge Symmetry Breaking

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Chinese journal of nuclear physics 1994年第2期16卷 139-145页

作者： Luo Bin Kong Fanxin Liu Xianhui(Center of Theoretical Physics CCA ST( World Lab.),Beijing 100080)(Institute of High Energy Physics,Academia Sinica,Beijing 100039) Guangxi Teacher’s University,Guilin,541001. 中科院高能物理所北京 100039 中科院高能物理所北京

-The dynamical structure of A≤4 Λ-hypernuclei is studied by using thefew-body theoretical *** AN interaction is taken to be the meson exchange po-tential with the single k,ω,η exchange diagrams and the box diagrams of π and πρ ex-change containing the intermediate state particles Σ,Δ.The Λ binding energy differenceof the mirror hypernuclei _Λ~4He and _Λ~4H is *** is shown that the root meansquare distances between the particles in the light hypernuclei are almost the same andthere does not exist any nuclear *** relative motion between particles stay mainlyin 1S state.

关键词： hypernuclei Few body Meson exchange

γ-ray Spectroscopy of hypernuclei:Recent KEK Results and Future Plans at J-PARC

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原子核物理评论 2009年第S1期26卷 34-38页

作者： S.Ajimura K.Aoki M.Dairaku H.Fujioka T.Fukuda K.Futatsugawa K.Hosomi W.Imoto M.Kawai Y.Kakiguchi S.Kinoshita T.Koike N.Maruyama M.Mimori S.Minami Y.Miura K.Miwa Y.Miyagi T.Nagae D.Nakajima H.Noumi K.S hirotori T.Suzuki T.Takahashi T.N.Takahashi K.Tanida N.Terada A.Toyoda K.Tsukada M.Ukai H.Tamura Department of Physics Osaka University High Energy Accelerator Research Organization (KEK) Department of Physics Kyoto University Department of Physics University of Tokyo Osaka Electro-Communication University Department of Physics Tohoku University RIKEN

In this proceeding,we will first outline the experimental setup and main results of the most recent hypernuclear γ-ray spectroscopy experiment (KEK-E566) performed at KEK-PS K6 beam line. The main feature and characteristics of this type of research will be emphasised. After that,the approved experimental proposal (E13) at J-PARC facility will be introduced briefly.

关键词： γ-ray spectroscopy hypernuclei

STABILITY OF J~π=O^+ DOUBLE ∧ hypernuclei(A=4)

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Chinese Science Bulletin 1982年第7期27卷 711-714页

作者：王潍潍张禹顺王如琳 Institute of Theoretical Physics Academia Sinica Beijing Institute of High Energy Physics Academia Sinica Beijing Institute of High Energy Physics Academia Sinica Beijinghe discovery of Be has aroused many researchers' interest in studying double ∧ hypernuclei. In general they use a variational method and choose a phenomenological potential to diseuss the 3-body He(α-∧-∧) or 4-body Be (α-α-∧-∧) problems. Their results can explain the double ∧ hypernuclei He and Be observed in experiments. Up to now H has not been found in experiment.

The discovery of Be has aroused many researchers’ interest in studying double ∧ hypernuclei. In general, they use a variational method, and choose a phenomenological potential to diseuss the 3-body He(α-∧-∧) or 4-body Be (α-α-∧-∧) problems. Their results can explain the double ∧ hypernuclei He and Be observed in experiments. Up to now, H has not been found in experiment.

关键词： explain choose variational body A=4 DOUBLE hypernuclei STABILITY OF J choice attributed

The ∧∧ Bond Energy in Double-∧ hypernuclei

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The ∧∧ Bond Energy in Double-∧ Hypernuclei

Position reconstruction in fission fragment detection using the low pressure MWPC technique for the JLab experiment E02-017

第十三届全国核结构研讨会暨第九次全国“核结构与量子力学”专题讨论会

作者： H.F.L~(1 1)) 1(College of Science,China Agriculture University,Beijing 100083,P.R.China)

To provide guideline for near future experiments proposed at PANDA@FAIR and J-PARC,the∧∧bond energy in double-∧hypernuclei are explored with a new effective∧N interaction PK1-Y1,which is obtained by optimizing both hyperon binding energy and spin-orbit splitting within a relativistic mean field approach. The AA bond energy under case with onlyσ,ωmesons exchanged is found to be consistent with a perturbation calculation based on a Skyrme-Hartree-Fock *** the strange mesons such as scalarσ and vectorΦ,the net contribution fromσ andΦhas sharply reduced the∧∧bond *** addition,core polarization effect is shown tiny in heavier double-∧hypernuclei.

关键词： bond energy hypernuclei core polarization

来源： cnki会议评论

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cnki会议

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Chinese Physics C 2014年第7期38卷 22-29页

作者：邱玺玉 L.Tang A.Margaryan 徐进章胡碧涛陈熙萌 School of Nuclear Science and Technology Lanzhou University Department of Physics Hampton University Thomas Jefferson National Accelerator Facility Newport News VA 23606 USA Yerevan Physics Institute School of Electrical and Automation Hefei University of Technology

When a A hyperon is embedded in a nucleus it can form a hypernucleus. The lifetime and its mass dependence of stable hypernuclei provide information about the AN interaction in the nuclear medium. This work will introduce the Jefferson Lab experiment （E02-017）, which aims to study the lifetime of the heavy hypernuclei using a specially developed fission fragment detection technique： a multi-wire proportional chamber operating under low gas pressure （LPMWPC）. The trajectory of the detected fragment is reconstructed and used to find the fission point on the target foil, the position resolution is less than I ram, which meets the original design, the separation of target materials and events mixture percentage in different regions are verified by Monte Carlo simulation.

关键词： hypernuclei decay LPMWPC fission fragment position reconstruction