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1991 Fiscal Year Final Research Report Summary

Nuclear Structure and Nuclear Reaction Studies Using the Ring Cyclotron

Research Project

Project/Area Number 01302012
Research Category

Grant-in-Aid for Co-operative Research (A)

Allocation TypeSingle-year Grants
Research Field 核・宇宙線・素粒子
Research InstitutionTokyo Institute of Technology

Principal Investigator

OHNUMA Hajime  Tokyo Inst. Tech., Dept. Phys., Prof., 理学部, 教授 (00011544)

Co-Investigator(Kenkyū-buntansha) MORINOBU Shunpei  Kyushu Univ., Dept. Phys., Prof., 理学部, 教授 (50016078)
KATORI Kenji  Osaka Univ. Dept. Phys., Prof., 理学部, 教授 (20013485)
TAKIGAWA Noboru  Tohoku Univ., Dept. Phys., Assoc. Prof., 理学部, 助教授 (00125600)
ORIHARA Hikonojo  Tohoku Univ., CYRIC, Prof., サイクロトロンRIセンター, 教授 (00004432)
TANIHATA Isao  Inst. Phys. Chem. Res., Principal Research Scientist, リニアック研, 主任研究員 (10089873)
Project Period (FY) 1989 – 1991
KeywordsRing Cyslotron / Nuclear Structure / Nuclear Reactions / Neutron-Halo Nuclei / On-Line Isotope Separation / Nuclear Stability / Astronuclear Physics / Nuclear Spin-Isospin Excitation
Research Abstract

All the experimental facilities have been completed during this three year period, and a variety of data have been obtained. Analyses of these data, discussions among experimental and theoretical researchers were made.
Neutron halos were observed in extremely neutron rich light nuclei, and theoretical interpretation of such phenomena based on Hartree-Fock calculations, relativistic Hartree calculations, etc. were made. A new mode of electric dipole giant resonances, which appears at relatively low excitation energies in neutron halo nuclei, is being studied both experimentally and theoretically. A proton elastic scattering experiment was done on such halo nuclei using inverse kinematics. A possibility of producing super-heavy elements with beams of halo nuclei was suggested. Large polarization and alignment of fragments were observed in heavy-ion reactions, and their momentum dependence was explained by simple kinematical considerations. Hafnium isotopes, which have very high melting po … More int, were successfully extracted in laser spectroscopy experiments using on-line mass separator GARIS/IGISOL. Neutron and gamma-ray emission from highly excited nuclei produced in heavy-ion reactions was studied to find out the limiting temperature up to which nuclear matter can remain as a cluster such as a nucleus. A Coulomb excitation experiment of unstable nucleus 140 was made, and to extract capture cross sections relevant to an astronuclear reaction and nuclear synthesis. Measurements of (d, 2He) reactions were made with a swinger-magnetic analyzer system. It was found that O-degree cross sections of the (d, 2He) reactions are proportional to the Gamow-Teller beta decay strength, and such reactions can be a powerful tool in studies of nuclear spin-isospin mode. Protons and neutrons emitted in the same direction were identified with the same system to extract information on the breakup processes of deuterons and the proton-neutron final state interaction. Zero-degree measurements of product nuclei in heavy-ion charge exchange reactions were successfully made, opening an opportunity to use such reactions for spin-isospin excitation mode studies at 100 MeV/u or more incident energies.
Numerous group meetings, workshops, and discussion sessions were held thanks to this Grant. A symposium was held on January 27 through 29 this year. At the symposium, the results of the present research project were presented, many related talks were given, and active discussions were made by about 180 attendants. Less

  • Research Products

    (79 results)

All Other

All Publications (79 results)

  • [Publications] H.Katsuragawa: "high Density Atomic Beam Source by a Laser Ablation Method" Nucl.Instr.Meth.B43. 259-261 (1989)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] A.Iwamoto: "Anomalous Enhancement of the Sub-Barrier Fusion Cross Section by Cooperative Shell and Deformation Effects" Phys.Lett.B219. 176-180 (1989)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] H.Toki: "Ikeda's sum rule and charge-exchange reactions on Fe" Phys.Let.B219. 181-183 (1989)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] E.Uegaki: "On Resonance of the 24Mg-24Mg System" Phys.Lett.B231. 28-34 (1989)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] T.Kobayashi: "Electromagnetic Dissociation and Soft Giant Dipole Resonance of the Neutron-Dripline Nucleus 11Li" Phys.Lett.B232. 51-55 (1989)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] H.Harada: "High-spin states in 114Sn" Phys.Rev.C39. 511-512 (1989)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] I.Tanihata: "On the possible use of secondary radioactive beams" Treatise on Heavy-Ion Science. 8. 443-514 (1989)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] S.Kubono: "The Proton Threshold States in 21Mg Relevant to the rp-Process" Z.Phys.A334. 511-512 (1989)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] H.Toki: "Origin of quenching of Gamow-Teller Strength in 54Fe" Z.Phys. A334. 523-524 (1989)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] T.Ichihara: "Data Acquisition System at the RIKEN Accelerator Facility" IEEE Trans.Nucl.Sc.36. 1628-1629 (1989)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] W.P.Liu: "Identification of projectile fragments using position sensitive silicon detectors" Nucl.Instr.Meth.A287. 476-480 (1990)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] T.Nakagawa: "Timing properties of a new type time pick-up detector" Nucl.Instr.Meth.A290. 136-138 (1990)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Y.L.Luo: "A semiclassical model for inclusive nucleon inelastic scattering to coninuum" Phys.Lett.B235. 211-214 (1990)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] K.Asahi: "New aspect of intermediate energy heavy ion reactions.Largespin poparization of fragments" Phys.Lett.B251. 488-492 (1990)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] G.Tatara: "The imaginary part of channel-coupling potentials for 6Li induced reactions" Prog.Theor.phys.83. 552-564 (1990)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] S.Mizutori: "Octupole vibrations built on superdeformed rotational bands" Prog.Theor.phys.83. 666-670 (1990)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] T.Tazawa: "Resonances due to the Landau-Zener Transition" Phys.Rev.C41. R17-R20 (1990)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] K.Ashi: "Half-life and branching ratios of 130 beta decay" Phys.Rev.C41. 358-361 (1990)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] M.Ichimura: "Relation among theories of inclusive breakup reactions" Phys.Rev.C41. 834-840 (1990)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] N.Takigawa: "Thermal decay rate of multidimensional fission under a nonlinear coupling" Phys.Rev.C41. 2451-2454 (1990)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] K.Shimoura: "Nuclear polarization and magnetic resonance of unstable 170Tm with bata-ray radiation-detected optical pumping in solids" Phys.Rev.C42. R487-R490 (1990)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Y.Hatsukawa: "Systematics of alpha decay half-lives" Phys.Rev.C42. 674-682 (1990)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] T.Minamisono: "Electromagnetic moments of the doubly closed shell±1 nucleon nuclei and on-line nuclear polarization" Hyperfine Int.59. 31-40 (1990)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] H.Nakahara: "Systematic behaviour of mass yield curves in low energy fission of actinides" J.Raioanal.Nucl.Chem.142. 231-251 (1990)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] K.Yuasa-Nakagawa: "Properties of the fast timing detector using an electron multiplier" Nucl.Instr.Meth.A300. 538-541 (1991)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] T.Suzuki: "Negative pion production in subthreshold heavy ion collisions" Phys.Lett.B257. 27-31 (1991)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] N.Takigawa: "A geometric approach to strong coupling effects in heavy-ion collisions" Phys.Lett.B262. 199-204 (1991)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] T.Motobayashi: "Determination of the astrophysical 13N(p,γ)140 cross section through the Coulomb dissociation method" Phys.Lett.B264. 259-263 (1991)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] N.Takigawa: "Interaction potential and fusion of a halo nucleus" Phys.Lett.B265. 23-28 (1991)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] M.Fukuda: "Neutron halo in 11Be studied via reaction cross sections" Phys.Lett.B268. 339-344 (1991)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] H.Toki: "properties of nuclei far from the stability line in the relativistic Hartree theory" Nucl.Phys.A524. 633-648 (1991)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] K.-I.Kubo: "The spin distribution in heavy-ion fusion" Nucl.Phys.A534. 393-402 (1991)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] T.Tazawa: "Quantum-mechanical study of the Landau-Zener resonances in nuclear heavy-ion collisions" Prog.Theor.Phys.85. 567-587 (1991)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] S.Mizutori: "Soft octupole vibrations with K=0 and K≠0 built on superdeformed rotational bands and static pairing correlations" Prog.Theor.Phys.86. 131-149 (1991)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] K.Asahi: "Observation of spin-aligned secondary fragment beams of 14B" Phys.Rev.C43. 456-460 (1991)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] A.B.Balantekin: "Description of nuclear structure effects in sub-barrier fusion by the interacting boson model" Phys.Rev.C44. 145-151 (1991)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] N.Takigawa: "Dynamic polarization potential induced by the Coulomb excitation of deformed heavy ions" Phys.Rev.C44. 477-484 (1991)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] K.Heiguchi: "Half-lives and Qβ measurements for new nuclei of 89Tc and 89mTc" Z.Phys.A338. 7-10 (1991)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] M.Koizumi: "Velocity distrbution of ion beams from the RIKEN IGISOL" Nucl.Instr.Meth.

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Y.Fukashiro: "Nuclear laser spectroscopy using a laser microwave double resonance" Hyperfine Int.

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] M.Koizumi: "Collinear fast atomic beam laser spectroscopy at RIKEN GARIS/IGISOL" Hyperfine Int.

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] H. Katsuragawa et al.: "High Density Atomic Beam Source by a Laser Ablation Method" Nucl. Instr, Meth.B43. 259-261 (1989)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] A. Iwamoto et al.: "Anomalous Enhancement of the Sub-Barrier Fusion Cross Section by Cooperative Shell and Deformation Effects" Phys. Lett.B219. 176-180 (1989)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] H. Toki et al.: "Ikeda's sum rule and charge-exchange reactions on Fe" Phys. Lett.B219. 181-183 (1989)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] E. Uegaki et al.: "On Resonance of the 24Mg-24Mg System" Phys. Lett.B231. 28-34 (1989)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] T. Kobayashi et al.: "Electromagnetic Dissociation and Soft Giant Dipole Resonance of the Neutron-Dripline Nucleus 11Li" Phys. Lett.B232. 51-55 (1989)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] H. Harada et al.: "High-spin states in 114Sn" Phys. Rev.C39. 132-138 (1989)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] I. Tanihata: "On the possible use of secondary radioactive beams" Treatise on Heavy-Ion Science. 8. 443-514 (1989)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] S. Kubono et al.: "The Proton Threshold States in 21Mg Relevant to the rp-Process" Z. Phys.A334. 511-512 (1989)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] H. Toki et al.: "Origin of quenching of Gamow-Teller strength in 54Fe" Z. Phys.A334. 523-524 (1989)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] T. Ichihara et al.: "Data Acquisition System at the RIKEN Accelerator Facility" IEEE Trans. Nucl. Sc.36. 1628-1629 (1989)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] W. P. Liu et al.: "Identification of projectile fragments using position sensitive silicon detectors" Nucl. Instr. Meth.A287. 476-480 (1990)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] T. Nakagawa et al.: "Timing properties of a new type time pick-up detector" Nucl. Instr. Meth.A290. 136-138 (1990)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Y. L. Luo et al.: "A semiclassical model for inclusive nucleon inelastic scattering to continuum" Phys. Lett.B235. 211-214 (1990)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] K. Asahi et al.: "New aspect of intermediate energy heavy ion reactions. Large spin polarization of fragments" Phys. Lett.B251. 488-492 (1990)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] G. Tatara et al.: "The imaginary part of channel-coupling potentials for 6Li induced reactions" Prog. Theor. Phys.83. 552-564 (1990)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] S. Mizutori et al.: "Octupole vibrations built on superdeformed rotational bands" Prog. Theor. Phys.83. 666-670 (1990)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] T. Tazawa et al.: "Resonances due to the Landau-Zener Transition" Phys. Rev.C41. R17-R20 (1990)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] K. Asahi et al.: "Half-life and branching ratios of 130 beta decay" Phys. Rev.C41. 358-361 (1990)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] M. Ichimura et al.: "Relation among theories of inclusive breakup reactions" Phys. Rev.C41. 834-840 (1990)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] N. Takigawa et al.: "Thermal decay rate of multidimensional fission under a nonlinear coupling" Phys. Rev.C41. 2451-2454 (1990)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] K. Shimoura et al.: "Nuclear polarization and magnetic resonance of unstable 170Tm with beta-ray radiation-detected optical pumping in solids" Phys. Rev.C42. R487-R490

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Y. Hatsukawa et al.: "Systematics of alpha decay half-lives" Phys. Rev.C42. 674-682 (1990)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] T. Minamisono et al.: "Electromagnetic moments of the doubly closed shell <plus-minus>1 nucleon nuclei and on-line nuclear polarizati " Hyperfine Int.59. 31-40 (1990)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] H. Nakahara et al.: "Systematic behaviour of mass yield curves in low energy fission of actinides" J. Raioanal. Nucl. Chem.142. 231-251 (1990)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] K. Yuasa-Nakagawa et al.: "Properties of the fast timing detector using an electron multiplier" Nucl. Instr. Meth.A300. 538-541 (1991)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] T. Suzuki et al.: "Negative pion production in subthreshold heavy ion collisions" Phys. Lett.B257. 27-31 (1991)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] N. Takigawa et al.: "A geometric approach to strong coupling effects in heavy-ion collisions" Phys. Lett.B262. 199-204 (1991)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] T. Motobayashi et al.: "Determination of the astrophysical 13N(p. gamma)140 cross section through the Coulomb dissociation method" Phys. Lett.B264. 259-263 (1991)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] N. Takigawa et al.: "Interaction potential and fusion of a halo nucleus" Phys. Lett.B265. 23-28 (1991)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] M. Fukuda et al.: "Neutron halo in 11Be studied via reaction cross sections" Phys. Lett.B268. 339-344 (1991)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] H. Toki et al.: "Properties of nuclei far from the stability line in the relativistic Hartree theory" Nucl. Phys.A524. 633-648 (1991)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] K. -I. Kubo et al.: "The spin distribution in heavy-ion fusion" Nucl. Phys.A534. 393-402 (1991)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] T. Tazawa et al.: "Quantum-mechanical study of the Landau-Zener resonances in nuclear heavy-ion collisions" Prog. Theor. Phys.85. 567-587 (1991)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] S. Mizutori et al.: "Soft octupole vibrations with K=0 and K 0 built on superdeformed rotational bands and static pairing correlations" Prog. Theor. Phys.86. 131-149 (1991)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] K. Asahi et al.: "Observation of spin-aligned secondary fragment beams of 14B" Phys. Rev.C43. 456-460 (1991)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] A. B. Balantekin et al.: "Description of nuclear structure effects in sub-barrier fusion by the interacting boson model" Phys. Rev.C44. 145-151 (1991)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] N. Takigawa et al.: "Dynamic polarization potential induced by the Coulomb excitation of deformed heavy ions" Phys. Rev.C44. 477-484 (1991)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] K. Heiguchi et al.: "Half-lives and Qbeta measurements for new nuclei of 89Tc and 89mTc" Z. Phys.A338. 7-10 (1991)

    • Description
      「研究成果報告書概要(欧文)」より

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Published: 1993-03-16  

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