• Search Research Projects
  • Search Researchers
  • How to Use
  1. Back to previous page

Nuclear Okorokov effect of heavy ions with relativistic energy

Research Project

Project/Area Number 07404019
Research Category

Grant-in-Aid for Scientific Research (A)

Allocation TypeSingle-year Grants
Section一般
Research Field 物理学一般
Research InstitutionThe University of Tokyo

Principal Investigator

KOMAKI Ken-ichiro  The University of Tokyo, Graduate School of Arts and Sciences, Professor, 大学院・総合文化研究科, 教授 (40012447)

Co-Investigator(Kenkyū-buntansha) MURAKAMI Takashi  National Institute of Radiological Sciences, Senior Researcher, 放射線医学総合研究所, 主任研究官 (20166250)
AZUMA Toshiyuki  The University of Tokyo, Graduate School of Arts and Sciences, Research Associat, 大学院・総合文化研究科, 助手 (70212529)
YAMAZAKI Yasunori  The University of Tokyo, Graduate School of Arts and Sciences, Professor, 大学院・総合文化研究科, 教授 (30114903)
Project Period (FY) 1995 – 1997
Project Status Completed (Fiscal Year 1997)
Budget Amount *help
¥20,800,000 (Direct Cost: ¥20,800,000)
Fiscal Year 1997: ¥6,100,000 (Direct Cost: ¥6,100,000)
Fiscal Year 1996: ¥6,600,000 (Direct Cost: ¥6,600,000)
Fiscal Year 1995: ¥8,100,000 (Direct Cost: ¥8,100,000)
Keywordschanneling / heavy ion / Okorokov effect / nuclear excitation / resonant coherent excitation / relativistic energy / 電子損失断面積
Research Abstract

Channeling ions have a possibility to be excited in the internal levels by a periodic potential of a crystal. It is called Resonant Coherent Excitation (PCE). The condition of RCE in nuclear levels is satisfied with relativistic heavy ions supplied by HIMAC.
A channeling experiment in a relativistic energy region requires a beam with extremely small angular divergence. We have developed a parallel beam, and observed the reductions of the energy deposition and the angular spread of channeling ions under several channeling conditions. channeling ions under several channeling conditions.
We have succeeded in observing the atomic RCE from 1s to n=2 states with 390MeV/u Ar^<17+> ions planar channeled in a Si crystal, by measuring the charge state distribution after transmission through the crystal. Under several RCE conditions, the fraction of survived Ar^<17+> ions was observed to decrease drastically. We also measured the energy deposition of channeling ions adopting a totally depleted silicon detector as a target crystal. The energy deposition of the plannar channeling ion is closely related to the trajectory in the crystal, and provides the information of the position dependent crystal field. The resonance profiles are well explained by the L・S interaction and the Stark effect originated in the crystal field.

Report

(4 results)
  • 1997 Annual Research Report   Final Research Report Summary
  • 1996 Annual Research Report
  • 1995 Annual Research Report
  • Research Products

    (21 results)

All Other

All Publications (21 results)

  • [Publications] T.Ito et.al.: "Channeling with 290MeV/u C^<6+> Ions in a Si Crystal" Physica Scripta. T73. 345-346 (1997)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] T.Ito et.al.: "Energy Loss of Channeled 290MeV/u C^<6+> ions in a Si crystal" Nuclear Instruments & Methods inPhysicis Research B. 135. 132-137 (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] T.Azuma et.al.: "Resonant Coherent Excitation of Relativistic Ar^<17+> Ions Channeled in a Si crystal" Nuclear Instruments & Methods inPhysicis Research B. 135. 61-65 (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] K.Komaki: "Atomic Processes of High Energy Heavy Ions Channeled in a Crystal" Nuclear Instruments & Methods inPhysicis Research B. 135. 16-24 (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] T.Ito, T.Azuma, K.Komaki, Y.Yamazaki, T.Murakami, E.Takada, A.Kitagawa, and M.Sano: "Channeling with 290MeV/u C^<6+> ions in a Si Crystal" Physica Scripta. T73. 345 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] T.Ito, T.Azuma, K.Komaki, Y.Yamazaki, M.Sano, M.Torikoshi, A.Kitagawa, E.Takada, and T.Murakami: "Energy Loss of Channeled 290MeV/u C^<6+> Ions in a Si Crystal" Nucl.Instr.Meth.B135. 132 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] T.Azuma, K.Komaki, T.Ito, Y.Yamazaki, M.Sano, M.Torikoshi, A.Kitagawa, E.Takada, and T.Murakami: "Resonant Coherent Excitation of Relativistic Ar^<17+> Ions Channeled in a Si Crystal" Nucl.Instr.Meth.B135. 61 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] K.Komaki: "Atomic Process of High Energy Heavy Ions Channeled in a Si Crystal" Nucl.Instr.Meth.B135. 16 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] T.Ito et.al.: "Channeling with 290MeV/uC^<6+> Ions in a Si Crystal" Physica Scripta. T73. 345-346 (1997)

    • Related Report
      1997 Annual Research Report
  • [Publications] T.Ito et.al.: "Energy Loss of Channeled 290MeV/uC^<6+> ions in a Si Crystal" Nuclear Instruments & Methods in Physicis Research B. 135. 132-137 (1998)

    • Related Report
      1997 Annual Research Report
  • [Publications] T.Azuma et.al.: "Resonant Coherent Excitation of Relativitic Ar^<17+> Ions Channeled in a Si crystal" Nuclear Instruments & Methods in Physicis Research B. 135. 61-65 (1998)

    • Related Report
      1997 Annual Research Report
  • [Publications] K.Komaki: "Atomic Processes of High Energy Heavy Ions Channeled in a Crystal" Nuclear Instruments & Methods in Physicis Research B. 135. 16-24 (1998)

    • Related Report
      1997 Annual Research Report
  • [Publications] Y.Yamazaki: "Stabillized Hollow Atoms(Ions) Produced with Multiply Charged Ions Passed through Microcapillaries" J.Phys.Soc.Jpn.65. 1199-1202 (1996)

    • Related Report
      1996 Annual Research Report
  • [Publications] S.Ninomiya: "L X-ray Emission from Slow Multiply Charged Ar Ions Bombarding Be and Al Targets" Nucl.Instrum.& Meth.B115. 177-180 (1996)

    • Related Report
      1996 Annual Research Report
  • [Publications] I.Yu.Tolstikhina: "Coster-Kronig Electron Spectra from the Singlet and ts Triplet 1s^22pnl(n=9-20) States of S^<12+> Ions" Phys.Scripta. 54. 188-196 (1996)

    • Related Report
      1996 Annual Research Report
  • [Publications] T.Azuma: "Charge Exchange and Stopping Power of Channeled Heavys Ions" Nucl.Instrum.& Meth.B115. 306-309 (1996)

    • Related Report
      1996 Annual Research Report
  • [Publications] T.Azuma: "Trajectory Dependent Charge-state Distribution ofeavys Planar Channeled Heavy Ions" Nucl.Instrum.& Meth.B115. 310-313 (1996)

    • Related Report
      1996 Annual Research Report
  • [Publications] H.Tawara: "X Rays from Radiative Electron Capture into Continuum States in Relativistic Heavy-Ion Collisions" Phys.Rev.A55. 1-4 (1997)

    • Related Report
      1996 Annual Research Report
  • [Publications] N.Kakutani: "Potential Sputtering of Protons from a Surface under Slow Highly Charged Ion Bombardments" Jpn.J.Appl.Phys.34. L580-583 (1995)

    • Related Report
      1995 Annual Research Report
  • [Publications] N.Kakutani: "Strong Charge State Dependence of H^+ and H_2^+ Sputtering Induced by Slow Highly Charged lons" Nucl.Instrum.& Meth. B96. 541-544 (1995)

    • Related Report
      1995 Annual Research Report
  • [Publications] T.Azuma: "RECC Measurements for Heavy lon lmpact on Foil Targets at Relativistic Energies" Atomic Collision Research in Japan. 21. 38-40 (1995)

    • Related Report
      1995 Annual Research Report

URL: 

Published: 1995-04-01   Modified: 2016-04-21  

Information User Guide FAQ News Terms of Use Attribution of KAKENHI

Powered by NII kakenhi