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1990 Fiscal Year Annual Research Report

高励起領域に於ける原子核構造とその励起機構

Research Project

Project/Area Number 02302018
Research InstitutionNiigata University

Principal Investigator

池田 清美  新潟大学, 理学部, 教授 (40011548)

Co-Investigator(Kenkyū-buntansha) 久保 謙一  東京都立大学, 理学部, 教授 (50013389)
田辺 孝哉  埼玉大学, 教養部, 教授 (00008905)
清水 良文  九州大学, 理学部, 助手 (90187469)
滝川 昇  東北大学, 理学部, 助教授 (00125600)
鈴木 宣之  新潟大学, 理学部, 助教授 (70018670)
Keywords超変形回転帶 / 中性子超過剰核 / 中性子ハロ- / 分子共鳴状態 / ハイパ-原子核 / 巨大共鳴状態 / 超重原子核合成 / 重イオン反応
Research Abstract

本年取り上げた課題は6つあった。いずれも各々成果が認められる。超変形構造の高スピン状態に関する課題は超変形回転帯の発見の増大につれての系統的分光学的性質に関する実験デ-タの蓄積に対応して理論的研究も着実な発展を示した。中性子過剰核の構造と励起構造に関する研究課題は中性子ハロ-の発見以来急速に発展している。理論的研究も,特異な構造とそれに固有な励起モ-ドの解明の研究から始まったが,それらの研究が一段落すると共に,それらの特異構造を含んでの安定核から中性子雫線下の中性子超過剰核に至る全域的研究の検討がはじまっている。重イオン反応での分子共鳴状態に関する課題は継続的に発展しているが,より重い核での分子的状態の発生の機構や,外殻核子との結合の機構の解明等の研究に発展がみられた。ハイパ-核構造の研究は,s=ー1のランダ-及びシグマハイパ-核を中心に発展がみられたが,今年の一つの重要な発展はs=ー2の二重ランダ-ハイパ-核への研究の展開が始まったことである。スピン・アイソスピン自由度を含む巨大共鳴に関する研究も励起高温状態のなかでの発現の他に,新たに中性子超過剰核でのソフトモ-ドの発生という新らしい問題となって展開がみられた。これらの構造状態の生成反応の機構に関する研究は,上記構造とその固有な励起モ-ドの研究とは,現象の解明に於て不可なものであり,この面での研究の発展がみられた。又,上記の研究は天体核現象と又核融合の課題と密接な関連があり,これらの面の研究に発展がみられた。更に興味深いこととして,不安定な中性子超過剰核の融合反応よって超重核を含む重い不安定核の合成がこれまでよりも高い確率で出来る可能性が考えられるようになった事である。端緒であるが,本研究計画においても既に一部成果が生まれつつある。以上の様な成果と発展からみて,来年度以降の研究計画の展開が一層楽しみな状況になったと言えよう。

  • Research Products

    (63 results)

All Other

All Publications (63 results)

  • [Publications] Y.Tosaka and Y.Suzuki: "Structure of ^<11>Li in the Clusterーorbital Shell Model for the ^9Li+n+n System" Nuclear Physics. A512. 46-60 (1990)

  • [Publications] Y.Tosaka,Y.Suzuki and K.Ikeda: "Structure of NeutronーHalo in the Ground State of ^<11>Li" Progress of Theoretical Physics. 83. 1140-1147 (1990)

  • [Publications] S.Hara,K.T.Hecht and Y.Suzuki: "Alpha Cluster Formation in ^<20>Ne in the Clusterーorbital Shell Model.I ーーーThe ^<16>O+Single Nucleon Problemーーー" Progress of Theoretical Physics. 84. 254-268 (1990)

  • [Publications] Y.Suzuki and Y.Tosaka: "Electromagnetic Dissociation of ^<11>Li and Soft Dipole Model" Nuclear Physics. A517. 599-614 (1990)

  • [Publications] N.Takigawa: "Thermal decay rate of multidimensional fission under a nonlinear coupling" Phys.Rev.C. 41. 2451-2454 (1990)

  • [Publications] N.Takigawa: "Geometric approach to heavy ion collisionsーelastic scattering and the synthesis of super heavy elements" Heavy Ion Collisions at Energies near the Coulomb Barrier 1990 (IOP Conference series 110). 110. 205-215 (1991)

  • [Publications] N.Takigawa: "Dynamic Polarization Potential induced by the Coulomb Excitation of Deformed HeavyーIons;A Geometric Scattering Approach" Submitted to Phys.Rev.C. (1991)

  • [Publications] Y.Abe: "Decay Dynamic of Hot Nuclei" Proc.Second IN2P3ーRIKEN Syposium on HeavyーIon Collisions. 169-185 (1991)

  • [Publications] T.Kajino: "Production of light elements in primordial nucleosynthesis" Astrophys.J.359. 267-276 (1990)

  • [Publications] T.Kajino: "Primordial nucleosynthesis of intermediateーmass elements in baryonーnumber inhomogeneous bigーbang models" Astrophys.J.364. 7-14 (1990)

  • [Publications] K.Sumiyoshi: "The evolution of the baryon number density during the cosmic quarkーhadron phase transition" Phys.Rev.D42. 3963-3968 (1990)

  • [Publications] M.Fukugita: "Contribution of the ^3He( ^3H,γ) ^6Li reaction to primordial ^6Li production" Phys.Rev.D42. 4251-4253 (1990)

  • [Publications] T.Kajino: "Can quarkーgluon plasma formation in relatistic heavyーion collisions constrain inhomogeneous cosmologies?" Phys.Rev.Lett.66. 125-128 (1991)

  • [Publications] T.Yamazaki: "Pion transter reaction spectroscopy of inverse kinematics for studies of deeply bound pionic atoms in heavy nuclei" Nucl.Insth.Methods. A292. 619-628 (1990)

  • [Publications] M.Mizoguchi: "Modification of pion and nucleon scattering Amplitudes in ^<12>C at k=0.8GeN/C" Nucl.Phys.A513. 685-696 (1990)

  • [Publications] T.Hoshino: "Shell model studies of light neutronーrich nuclei" Nucl.Phys.A. 506. 271-292 (1990)

  • [Publications] H.Sagawa: "Momentum distributions of looselyーbound neutrons with peripheral direct reaction model" Phys.Lett.B. 244. 149-154 (1990)

  • [Publications] M.Honma: "Nucleonic and electromagnetic reaction cross sections of medium and high energy ^<11>Li projectiles" Prog.Theor.Phys.84. 494-501 (1990)

  • [Publications] S.Fleck,W.Bentz,K.Shimizu and K.Yazaki: "A SigmaーOmegaーQuark Model to Saturate Nuclear Matter" Nuclear Physics A. 510. 731-739 (1990)

  • [Publications] Y.Koike,K.Shimizu and K.Yazaki: "Study of HyperonーNucleon and HyperonーHyperon Interaction in the FlipーFlop Model" Nuclear Physics A. 513. 653-666 (1990)

  • [Publications] K.Kato,W.Benz,K.Shimizu and A.Arima: "Quark Shell Model of Nuclei and Nuclear Magnetic Moments" Physical Review C. 42. 2672-2679 (1990)

  • [Publications] S.Tadokoro: "NucleusーΣ Potential" Phys.Rev.C42. 2591-2596 (1990)

  • [Publications] S.NakaichiーMaeda: "Lightest DoubleーΛ Hypernucleus" Prog.Theor.Phys.84. 1025-1029 (1990)

  • [Publications] K.Tanabe: "Proof of the extended BlochーMessiah theorem in the thermal HartreeーFockーBogoliubov theory" Physics Letters B. 247B. 202-205 (1990)

  • [Publications] K.Tanabe: "Microscopic structure of the superdeformed rotational band in ^<132>Ce" Progress of Theoretical Physics. 83. 1148-1155 (1990)

  • [Publications] T.Tazawa: "Resonances due to the LandauーZener Transition" Phys.Rev.C. 41. R17-R20 (1990)

  • [Publications] S.Okabe: "Light ΣーHyper Nuclei and αーClustering" Nuclear Physics. A514. 613-620 (1990)

  • [Publications] F.Sakata: "Nuclear Spectroscopy and Quantum Chaos" Nuclear Physics. A519. 93-107 (1990)

  • [Publications] K.Itonaga: "pーShell Hypernuclei via(κ^ー,π^ー),(π^+,κ^+)and(Stopped κ^ー,π^ー)Reactions" Prog.Theor.Phys.84. 291-316 (1990)

  • [Publications] H.Kurasawa: "The ωーMeson Mass and the Nucleon Size in Nuclei" Prog.Theor.Phys.84. 1030-1035 (1990)

  • [Publications] K.Taniguchi: "A New Type of Bosonization of QuasiーParticle Pair Modes" Progress of Theoretical Physics. 84. 568-573 (1990)

  • [Publications] K.Taniguchi: "BosonーFermion Expainsion of Correlated Pair Modes" DPNU (Dept.of Phys.Nagoya Univ.preprint). 91ー05. 1-23 (1991)

  • [Publications] M.Doi,T.Sato,H.Ohtsubo,and M.Morita: "Effect of Meson Exchange Current in Deuteron Muon Capture" Nuclear Physics. A551. 507-524 (1990)

  • [Publications] M.Morita: "Weak Interactions Studied in Light Nuclei" Medium and High Energy Nyclear Physics. 1-10 (1991)

  • [Publications] M.Wakamatsu: "Spin Content of the Nucleon in a Chiral Quark Model" Physical Review. D42. 2427-2430 (1990)

  • [Publications] Y.R.Shimizu: "Inertias of Superdeformed Bands" Physical Review. C41. 1861-1864 (1990)

  • [Publications] Y.R.Shimizu: "Quantum Size Effects in Rapidly Rotating Nuclei" Physical Review. C41. 1865-1868 (1990)

  • [Publications] Y.R.Shimizu: "A Comparison of the RPA and Number Projection Approaches for Calculations of pairing fluctuations in Fast Rotating Nuclei" Nuclear Physics. A515. 38-56 (1990)

  • [Publications] B.Imanishi: "Nuclear LandauーZener Phenomena and the Fusion Cross Sections in the System ^<13>C+ ^<16>Oー ^<12>C+ ^<17>O" Proceedings of the interactional Conferedu on Heavy Ion Collisions at Eneugies near the Couloumb heavier. 83-92 (1990)

  • [Publications] B.Imanishi,S.Misono and W.Von Oertzen: "Nuclear LandauーZener Promotion in the Reactions of the System ^<13>C+ ^<16>Oー ^<12>C+ ^<17>O" Phys.Letters. 241. 13-18 (1990)

  • [Publications] T.Kajino: "Primordial nucleosynthesis and radioactive beams" Nucl.Instr.Meth.(1991)

  • [Publications] F.C.Barker: "Channel contributions to low energy ^<12>C(α,γ) ^<16>O cross sections" Anstralian J.Phys.(1991)

  • [Publications] S.Kubono: "Structure of ^<21>Mg and the first experimental determination of the ^<20>Ne(ρ,γ) ^<21>Mg stellar reaction rate" Nucl.Phys.A. (1991)

  • [Publications] Y.Yamamoto: "Theoretical studies of the ^7Li( ^3H,n) ^9Be reaction and primordial nucleosynthesis of ^9Be" Nucl.Phys.A. (1991)

  • [Publications] T.Cornelius et al.: "Predictions of the Paris NーN potential for threeーnucleon continum observables:Comparison of the two approaches" Physical Review C. 41. 2538-2543 (1990)

  • [Publications] J.L.Friar et al.: "Benchmark solution for a model threeーnucleon scattering problem" Physical Review C. 42. 1838-1840 (1990)

  • [Publications] Y.Koike: "Exact nーd scattering caluculation with a separable expansion of the twoーbody tーmatrix" Physical Review C. 42. 2286-2289 (1990)

  • [Publications] N.Onishi: "On the periodic solution of TDHF in rotating system"

  • [Publications] K.Tanabe: "The constrained HartreeーFockーBogoliubov approximation at finite temperature for superconductorsーーProposal of the formalism andーー" Journal of the Physical Society of Japan. 59. 3307-3321 (1990)

  • [Publications] K.Tanabe: "BlochーMessiah theorem at finite temperature" Zeitschrift fur Physik A (Atomic Nuclei). (1991)

  • [Publications] K.Tanabe: "Microscopic properties of the superselformech rotational states in light rareーearth nuclei ^<132>Ce and ^<134,136>Nd" Physics Letters B. (1991)

  • [Publications] K.Tanabe: "Nuclear structure at high temperature (Symposium on New Trends in Nuclear Collective Dynamics)" 京都大学基礎物理学研究所1990年10月29〜31日)素粒子論研究. (1991)

  • [Publications] K.Tanabe: "Fully Selfーconsistent microscopic approach to superdeformed states (INS Symposium on Nuclear Strucute)" at High Spin and High Excitation,東京大学原子核研究所1990年11月1〜4日)原子核研究. (1991)

  • [Publications] 田辺 孝哉: "核構造論における有限温度の取扱(基研短期研究会「低及び中高エネルギ-重イオン核反応機構」、京大基研)" 1990年9月27日〜29日)素粒子論研究. (1991)

  • [Publications] M.Igarashi: "TwoーNucleon Transfer Reaction Mechanism" Physics Reports. 199. 1 (1991)

  • [Publications] K.ーI.Kubo: "Transition Amplitudes in the FiniteーOrder Expansion Form" Nuclear Collective Motion and Nuclear Reaction Dynamics. 404 (1991)

  • [Publications] Y.Yamamoto: "Theoretical Studies of the ^7Li( ^3H,n) ^9Be Reaction and Primodial Nucleosynthesis of ^9Be" Nuclear Physics. A.

  • [Publications] K.ーI.Kubo: "The Spin Distribution in HeavyーIon Fusion" Journal of Physics. G.

  • [Publications] K.ーI.Kubo: "Extended DWBA Prescription and Angular Momentum Mismatched Reactions" Nuclear Physics. A.

  • [Publications] A.Hosaka: "Chiral Bag with Vector Mesons" Nucl.Phys.A506. 501-531 (1990)

  • [Publications] K.Tanabe:Extension of the thermal randum phase approximation by the thermo field dynamics: "Proc.of the 2nd Workshop on the Thermal Field Theories and Their Spplications (23ー27 July,1990;Tsukuba Univ.) T.Arimitsu,Ed." NorthーHolland,

  • [Publications] K.Tanabe:The BlockーMessiah Theorem for the thermal HartreeーFockーBogolibov theory: "Proc.of the 2nd Workshop on the Thermal Field Theories and Their Spplications (23ー27 July,1990;Tsukuba Univ.) T.Arimitsu,Ed." NorthーHolland,

  • [Publications] K.ーI.Kubo: "Nuclear Collective Motion and Nuclear Reaction Dynamics" World Scientific Publishing LTD., 300 (1990)

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Published: 1993-08-11   Modified: 2016-04-21  

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