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Nuclear physics with RI Beam Factory

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Frontiers of physics 2018年第6期13卷 145-159页

作者： Hiroyoshi Sakurai Department of Physics University of Tokyo 7-3-1 Hongo Bunkyo-ku Tokyo 113-0033 Japan RIKEN Nishina Center for Accelerator-Based Science 2-1 Hirosawa Wako Saitama 351-0198 Japan

Research activities of nuclear physics at Radioactive Isotope Beam Factory over 10 years are reviewed and future directions are also discussed. Conceptual ideas in designing the facility as well as experimental device... 详细信息

关键词： radioactive isotope beams heavy-ion accelerator facility in-flight production experimental devices and techniques storage rings r-process path nuclear waste problems

Covariant spin kinetic theory I:collisionless limit

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Chinese Physics C 2020年第9期44卷 83-94页

作者： Yu-Chen Liu Kazuya Mameda Xu-Guang Huang Physics Department and center for Particle Physics and Field Theory Fudan UniversityShanghai 200433China riken nishina center for accelerator-based science Wako 351-0198Japan Key Laboratory of Nuclear Physics and Ion-beam Application(MOE) Fudan UniversityShanghai 200433China

We develop a covariant kinetic theory for massive fermions in a curved spacetime and an external electromagnetic field based on quantum field *** derive four coupled semi-classical kinetic equations accurate to O(ℏ),which describe the transports of particle number and spin degrees of *** relationship with chiral kinetic theory is *** an application,we study spin polarization in the presence of finite Riemann curvature and an electromagnetic field in both local and global equilibrium states.

关键词： quantum kinetic theory quantum fields in curved spacetime relativistic heavy-ion collisions

Covariant spin kinetic theory Ⅰ: collisionless limit

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Chinese Physics C 2020年第9期44卷 87-98页

作者：刘玉琛 Kazuya Mameda 黄旭光 Physics Department and center for Particle Physics and Field Theory Fudan University riken nishina center for accelerator-based science Key Laboratory of Nuclear Physics and Ion-beam Application(MOE) Fudan University

We develop a covariant kinetic theory for massive fermions in a curved spacetime and an external electromagnetic field based on quantum field theory. We derive four coupled semi-classical kinetic equations accurate to O(■), which describe the transports of particle number and spin degrees of freedom. The relationship with chiral kinetic theory is discussed. As an application, we study spin polarization in the presence of finite Riemann curvature and an electromagnetic field in both local and global equilibrium states.

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Quantum computing for the Lipkin model with unitary coupled cluster and structure learning ansatz

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Chinese Physics C 2022年第2期46卷 131-139页

作者： Asahi Chikaoka Haozhao Liang Department of Physics Graduate School of ScienceThe University of TokyoTokyo 113-0033Japan riken nishina center Wako 351-0198Japan

We report a benchmark calculation for the Lipkin model in nuclear physics with a variational quantum eigensolver in quantum *** attention is paid to the unitary coupled cluster(UCC)ansatz and structure learning(SL)ansatz for the trial wave *** with both the UCC and SL ansatz can reproduce the ground-state energy well;however,it is found that the calculation with the SL ansatz performs better than thatwith the UCC ansatz,and the SL ansatz has even fewer quantum gates than the UCC ansatz.

关键词： Lipkin model quantum computing variational quantum eigensolver

Experiments on synthesis of the heaviest elements at riken

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Experiments on synthesis of the heaviest elements at RIKEN

New insight into the exotic states strongly coupled with the DD^(*)from the T_(cc)^(+)

The 6th China-Nuclear Physics Symposium

作者： K. Morimoto nishina center for accelerator based science riken (The Institute of Physical and Chemical Research) Japan

In the Institute of Physical and Chemical Research (riken), using high intensity heavy ion beams from riken Linear accelerator, productions and decays of isotopes of the heaviest elements have been investigated by using a gas-filled recoil separator, GARIS. The isotopes studied were 265Hs, 271Ds, 272 Rg, 277 112, and 278113, produced by reactions 208 Pb( 58Fe, n), 208Pb(64Ni, n)[1], 209 Bi(64Ni, n)[2],208 Pb(70Zn, n), 209 Bi(70Zn,

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science Bulletin 2024年第19期69卷 3036-3041页

作者： Guang-Juan Wang Zhi Yang Jia-Jun Wu Makoto Oka Shi-Lin Zhu KEK Theory center Institute of Particle and Nuclear Studies(IPNS)High Energy Accelerator Research Organization(KEK)Tsukuba 305-0801Japan School of Physics University of Electronic Science and Technology of ChinaChengdu 610054China School of Physical sciences University of Chinese Academy of Sciences(UCAS)Beijing 100049China Southern center for Nuclear-science Theory(SCNT) Institute of Modern PhysicsChinese Academy of SciencesHuizhou 516000China Advanced science Research center Japan Atomic Energy AgencyTokai 319-1195Japan nishina center for accelerator-based science RIKENWako 351-0198Japan School of Physics and center of High Energy Physics Peking UniversityBeijing 100871China

We have investigated the internal structure of the open-and hidden-charmed(DD^(*)/DD^(*))molecules in the unified *** first fit the experimental lineshape of the Tt state and extract the DD^(*)interaction,from which the T is assumed to arise *** we obtain the DD^(*)interaction by charge *** results show that the DD*interaction is attractive but insufficient to form X(3872)as a bound ***,its formation requires the crucial involvement of the coupled channel effect between the DD^(*)and cc components,although the cc accounts for approximately 1%*** X(3872),we have obtained a higher-energy state around 3957.9 MeV with a width of 16.7 MeV,which may be a potential candidate for the X(3940).In J^(PC)=1^(+-)sector,we have found two states related to the iso-scalar X(3872)and h_(c)(2P),*** combined study provides valuable insights into the nature of these DD^(+)/DD^(+)exotic states.

关键词： Quark model Charmonium(-like)states Coupled-channel effect Exotic hadrons

Physics opportunities with the RI Beam Factory at riken

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Physics opportunities with the RI Beam Factory at RIKEN

Design of Magnet System for riken Superconducting ECR Ion Source

The 6th China-Nuclear Physics Symposium

作者： H. Sakurai riken nishina center for accelerator-based science 2-1 Hirosawa WakoJapan 351-0198

The advent of a radioactive isotope (RI) beam in the last half of 1980’s has opened up a new era in the nuclear science, to investigate nuclei far from stability and to reveal out new phenomena in extreme conditions of isospin asymmetry. For instance, in the light and neutron-rich region, new forms of nuclear matter such as neutron halo/skin

关键词： Radioactive-isotope beam facility

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Chinese Physics C 2007年第S1期31卷 37-40页

作者： J.Ohnishi T.Nakagawa Y.Higurashi M.Kidera H.Saito A.Goto nishina Cnter for accelerator-based science RIKENHirosawa 2-1WakoSaitarna351-0198Japan

Superconducting magnet system for a 28GHz ECR ion source has been *** maximum axial magnetic fields are 4T at the rf injection side and 2T at the beam extraction side,*** hexapole magnetic field is about 2T on the inner surface of the plasma *** superconducting coils consist of six solenoids and six racetrack windings for a hexapole *** kinds of coil arrangements were investigated:one is an arrangement in which the hexpole coil is located in the bore of the solenoids,and another is the reverse of *** coils use NbTi-Copper conductor and are bath-cooled in liquid *** six solenoids are excited with individual power supplies to search for the optimal axial field *** current leads use high Tc material and the cryogenic system is operated in LHe re-condensation mode using small *** thermal insulated supports of the cold mass have also been designed based on the calculated results of the magnetic *** heat loads to 70K and LHe stages were estimated from the design of the supports,the current leads and so on.

关键词： ECR ion source superconducting coil cryogenic system

Estimating the production rates of D-wave charmed mesons via the semileptonic decays of bottom mesons

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Chinese Physics C 2019年第2期43卷 53-76页

作者： Kan Chen Hong-Wei Ke Xiang Liu Takayuki Matsuki School of Physical science and Technology Lanzhou University Research center for Hadron and CSR Physics Lanzhou University and Institute of Modern Physics of CAS School of science Tianjin University Tokyo Kasei University Theoretical Research Division Nishina CenterRIKEN

Using the covariant light-front approach with conventional vertex functions, we estimate the production rates of D-wave charmed/charmed-strange mesons via the B_((s)) semileptonic decays. As the calculated production rates are significant, it seems possible to experimentally search for D-wave charmed/charmed-strange mesons via semileptonic decays, which may provide an additional approach for exploring D-wave charmed/charmed-strange mesons.

关键词： light-front quark model semileptonic decay charmed/charmed-strange meson