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1991 Fiscal Year Final Research Report Summary

Study of the Extreme States with High Excitation Energy and High Spin by Ge-Si Crystal Ball.

Research Project

Project/Area Number 02452027
Research Category

Grant-in-Aid for General Scientific Research (B)

Allocation TypeSingle-year Grants
Research Field 核・宇宙線・素粒子
Research InstitutionKyushu University

Principal Investigator

MORINOBU Shunpei  Kyushu Univ., Fac. Sci., Professor -> 九州大学, 理学部, 教授 (50016078)

Co-Investigator(Kenkyū-buntansha) INOUE Hikaru  Hiroshima Univ., Fac., Sci., Associate Prof., 理学部, 助教授 (30028170)
MITARAI Shiro  Kyushu Univ., Fac., Sci., Assistant, 理学部, 助手 (00108648)
Project Period (FY) 1990 – 1991
KeywordsNuclear Structure / Nuclear Deformation / Multiplicity of Charged Particle / Rotational Band of Nucleus / Crystal Ball / In-beam Spectroscopy / Fusion Reaction Induced by Heavy Ion / Silicon Ball
Research Abstract

In the early stage of this project, a silicon detector array (Si Ball) which had proved to be quite powerful in the identifications and selections of the reaction channels in heavy ion fusion reaction was improved to stand the high duty use at high beam currents.
The combined system of NORDBALL and the improved Si Ball brought about a dramatic progress in the spectroscopic studies of the new deformed region of A=80 90. As a result, new level structures of nucleides of ^<87>Mo, ^<87>Nb, ^<85>Nb, ^<82>Y, ^<81>Y, ^<82>Zr and ^<82>Sr including highly excited states have been established and the analysis for the nuclear properties have been carried out. The deformation of nuclei in this region grows with the nucleon number toward Z and N = 40. The isotones of N = 46 were found to lie the border between spherical and deformed nucleus regions, and the nuclei of N=45 and 46 seem to be strongly deformed at highly excited high-spin states. These experimental results have been compared with the results of cranking model calculation.
Besides the above mentioned studies in Japan-NBI collaboration, lots of experiments have been carried out at the tandem accelerator laboratory of Kyushu University to clarify the properties of low-lying and ground states of the nuclei in the A = 80 -90 region. The fruitful outputs including a systematic discovery of new isotopes not only gave complementary information for the high spin states at high excitation but also led to the development of a new effective method of collecting thorough spectroscopic knowledge of these nuclei.

Research Products

(42 results)

All Other

All Publications

  • [Publications] S.E.Arnell: "The NORDBALL System Adopted for Spectroscopy of Nuclei Far from Stability" Cotributed paper of the International Conference on Nuclear Physics in Ninrties,Ork Ridge. 214 (1990)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 御手洗 志郎: "GammaーRay Measurement by Crystal Ball in Mass=80 Region" JAERIーM(日本原子力研究所). 72. 22 (1990)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 井上 光: "Experimental Studies of High Spin States of Nuclei by Coulomb Excitation and Measurements of inーbeam γ rays" KURRIーTR(京都大学原子炉実験所). 333. 43 (1990)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 閔 丙珠: "The Level Structure of 87ーNb" Nucl.Phys.A530. 211-231 (1991)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 黒柳 登喜大: "The Band Structure of 82ーSr" 原子核研究. 35. 51-58 (1991)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 御手洗 志郎: "Inーbeam Measurement by NOR DBALL,Inner Ball,Neutron Wall and Si Ball" 原子核研究. 35. 211-221 (1991)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] B.Cederwall: "HgihーSpin States in 121ーBa and Deformed Dependent Alignments" Nucl.Phys.A529. 410-428 (1991)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 黒柳 登喜大: "Multiplicity Measurement of Charged Particles Emitted in Nuclear Reaction" 原子核研究. 36. 153-165 (1991)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 小田原 厚子: "The β Decay of the New lsotope 88ーTc" KURRIーTR(京都大学原子炉実験所). 348. 68-73 (1991)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 御手洗 志郎: "Si Ball of New Type" KURRIーTR(京都大学原子炉実験所). 348. 65-67 (1991)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] B.Cederwall: "High Spin States of 120-Ba" Z.Phys.A-Hadrons and Nuclei. 338. 461-462 (1991)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] B.Cederwall: "Neutron and Proton hll/2.Alignment effects in 121-La" Z.Phys.A-Hadrons and Nuclei. 338. 463-464 (1991)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] S.Juutinen: "Evidence for Band Termination in 118-Xe" Z.Phys.A-Hadrons and Nuclei. 338. 365-366 (1991)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 平口 和彦: "Half Lives and Qーβ Measurements for new nuclei of 89ーTc and 89mーTc" Z.Phys.AーHadrons and Nuclei. 338. 7-10 (1991)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 外村 浩美: "インビ-ム核分光で使っているデ-タ収集系とデ-タ解析プログラムー九大タンデムー" 理研シンポジウム「重イオンビ-ムによる核分光」報告集. 2-23 (1991)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 御手洗 志郎: "インビ-ム核分光実験の現状ーNBI共同実験2ー" 理研シンポジウム「重イオンによる核分光」. 126-143 (1991)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 向 淳子: "The β Decay of the New Isotope 79ーY" Z.Phys.AーHadrons and Nuclei. (1992)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 黒柳 登喜大: "Rotational Band of 82ーZr," Z.Phys.AーHadrons and Nuclei.(1992)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 靜間 俊行: "Search of New Isotope 86ーMo" KURRIーTR. (1992)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 黒柳 登喜大: "The Silicon Ball:A 4π Si Detector Array for Reaction Channel Selection" Nuclear Instruments and Methods. (1992)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 御手洗 志郎: "Level Structure of 81ーY" 原子核研究. (1992)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] S. E. Arnell: "The NORDBALL System Adopted for Spectroscopy of Nuclei Far from Stability" Contributed paper of the Inter. Conf. on Nucl. Phys. in Nineties, Oak Ridge. 214 (1990)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] S. Mitarai: "Gamma-Ray Measurement by Crystal Ball in Mass=80 Region" JAERI-M. 72. 22 (1990)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] H. Inoue: "Experimental Studies of High Spin States of Nuclei by Coulomb Excitation and Measurements of in-beam lambda rays" KURRI-TR. 333. 13-18 (1990)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] B. J. Min: "The Level Structure of 87-Nb" Nucl. Phys.A530. 211-231 (1991)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] T. Kuroyanagi: "The Band Structure of 82-Sr" Genshikaku Kenkyu. 35. 51-58 (1991)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] S. Mitarai: "In-beam Measurement by NORDBALL, Inner Ball, Neutron Wall and Si Ball" Genshikaku Kenkyu. 35. 211-221 (1991)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] B. Cederwall: "High-Spin States in 121-Ba and Deformed Dependent Alignments" Nucl. Phys.A529. 410-428 (1991)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] T. Kuroyanagi: "Multiplicity Measurement of Charged Particles Emitted in Nuclear Reaction" Genshikaku Kenkyu. 36. 153-165 (1991)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] A. Odahara: "The beta Decay of the New Isotope 88-Tc" KURRI-TR. 349. 68-73 (1991)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] S. Mitarai: "Si Ball of New Type" Kurri-Tr. 348. 65-67 (1991)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] B. Cederwall: "High Spin States of 120-Ba" Z. Phys. A-Hadrons and Nuclei. 338. 461-462 (1991)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] B. Cederwall: "Neutron and Proton h11/2 Alignment effects in 121-La" Z. Phys. A-Hadrons and Nuclei. 338. 463-464 (1991)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] S. Juutinen: "Evidence for Band Termination in 118-Xe" Z. Phys. A-Hadrons and Nuclei. 338. 365-366 (1991)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] K. Heiguchi: "Half Lives and Q-beta Measurements for new nuclei of 89-Tc and 89m-Tc" Z. Phys. A-Hadrons and Nuclei. 338. 7-10 (1991)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] H. Tomura: "Data Acquisition and Analysis System on Nuclear Spectroscopy in Kyushu University" Proc. RIKEN Sym. Nucl. Spect. Neans. Heavy Ion Reac. Inst. Phys. Chem. Resea.Aug.2-23 (1991)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] S. Mitarai: "NBI Collaboration 2 (Kyushu Univ. Group on Nuclear Experiment)" Proc. RIKEN Sympo. Nucl. Spect. Neans. Heavy Ion Reac. Inst. Phys. Chem. Resea.Aug.126 (1991)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] J. Mukai: "The betaDacay of the New Isotope 79-Y" Z. Phys. A-Hadrons and Nuclei. (1991)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] T. Kuroyanagi: "Rotational Band of 82-Zr" Z. Phys. A-Hadrons and Nuclei. (1991)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] T. Shizuma: "Search of New Isotope 86-Mo" KURPI-TR. (1992)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] T. Kuroyanagi: "The Silicon Ball : A 4pi Si Detector Array for Reaction Channel Selection" Nucl. Instr. and Meth.(1992)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] S. Mitarai: "Level Structure of 81-Y" Genshikaku Kenkyu. (1992)

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

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Published: 1993-03-15  

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