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HIGH PRECISION SPECTROSCOPY OF HIGHLY-CHARGED HEAVY IONS WITH USE OF RESONANT COHERENT EXCITATI

Research Project

Project/Area Number 13440126
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Research Field 物理学一般
Research InstitutionTokyo Metropolitan University

Principal Investigator

AZUMA Toshiyuki  Tokyo Metropolitan University, Graduate School of Science, Associ.Prof, 理学研究科, 助教授 (70212529)

Co-Investigator(Kenkyū-buntansha) MURAKAMI Takeshi  Tokyo Metropolitan University, Graduate School of Science, Head Research, 放射線医学総合研究所, 室長(研究職) (20166250)
TANUMA Hajime  Tokyo Metropolitan University, Graduate School of Science, Research Ass, 理学研究科, 助手 (30244411)
Project Period (FY) 2001 – 2003
Project Status Completed (Fiscal Year 2003)
Budget Amount *help
¥14,700,000 (Direct Cost: ¥14,700,000)
Fiscal Year 2003: ¥2,100,000 (Direct Cost: ¥2,100,000)
Fiscal Year 2002: ¥5,500,000 (Direct Cost: ¥5,500,000)
Fiscal Year 2001: ¥7,100,000 (Direct Cost: ¥7,100,000)
Keywordschanneling / coherence / heavy ion / highly-charged ion / コヒーレント
Research Abstract

High-energy ions channeled in a crystal feel the oscillating periodic crystal field. When the energy corresponding to this period matches with the excitation energy of the inner levels of the ions, the ions have a chance to be excited resonantly, which is often called as resonant coherent excitation. We have succeeded in observing well-resolved spectra of the coherent excitation with use of several tens GeV heavy ions. Owing to the high energy, good coherence and very sharp resonance are obtained. We tried high-precision atomic spectroscopy of highly charged ions taking an advantage of this unique phenomenon of RCE of the ions under the channeling condition.
We developed specially prepared Si-detectors for target crystals to measure the ion trajectory in the crystal. Using this detector we simultaneously measured the charge distribution of the ions transmitting through the crystal, and their deposited energy. We observed the coherent excitation from the ground state to n=2,3,4 levels of H-like Ar^<17+> ions under the identical beam condition. In this manner, we could determine the beam energy and the transition energy at the same time with high precision, and deduce the Lamb shift in the ground state. That is, the Lamb shift is much larger in the ground state compared with those in the n=2,3,4 levels. By neglecting the Lamb shift in the excited state, we deduced the ground state Lamb shift and beam energy from the energy differences between n=1,2, n=1,3, n=1,4 difference. The major factors of the ambiguity in the simultaneous measurement of H-like and He-like ion, which had been previously tried, is not only the Stark effect contribution but also difficulty in the proper evaluation of the beam condition, which is good contrast to the present measurement. We could attain much better precision, and are now in the detailed analysis.

Report

(4 results)
  • 2003 Annual Research Report   Final Research Report Summary
  • 2002 Annual Research Report
  • 2001 Annual Research Report
  • Research Products

    (8 results)

All Other

All Publications (8 results)

  • [Publications] T.Azuma et al.: "Convoy electron emission from resonant coherently excited 390MeV/u hydrogen-like Arions"Nucl.Instr.Meth.. B212. 397-401 (2003)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] T.Azuma et al.: "Angular distribution of X-ray emission from resonant coherent excited highly charged heavy ions"Nucl.Inst.Meth.. B205. 779-783 (2003)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] T.Azuma et al.: "Convoy electron emission from resonant coherently excited 390 Mev/u hydrogen-like Ar ion"Nucl.Instr.Methods B. 212. 397-401 (2003)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] T.Azuma et al.: "Angular distribution of X-ray emission from resonant coherently excited highly-charged ions"Nucl.Instri Methods.B. 205. 779-783 (2003)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] T.Azuma et al.: "Convoy electron emission from resonant coherently excited 390MeV/u hydrogen-like Ar ions"Nucl.Instr.Meth.. B212. 397-401 (2003)

    • Related Report
      2003 Annual Research Report
  • [Publications] T.Azuma et al.: "Angular Distribution of X-ray Emission from Resonant Coherent Excited Highly Charged Heavy Ions"Nucl.Instr.Meth.. B205. 779-783 (2003)

    • Related Report
      2003 Annual Research Report
  • [Publications] T.Azuma, T.Ito, et al.: "Trajectory-dependent charge state and energy loss of relativistic heavy ions channeled in a silicon surface barrier detector"Nucl. Instr. Meth. B. 193. 178-182 (2002)

    • Related Report
      2002 Annual Research Report
  • [Publications] T.Azuma, T.Ito, et al.: "Resonant coherent excitation of hydrogen-like Arions to the n=3 states"Physica Scripta. T92. 61-64 (2001)

    • Related Report
      2001 Annual Research Report

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Published: 2001-04-01   Modified: 2016-04-21  

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