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Theory of pair production and radiation in inhomogeneous strong electromagnetic fields

Research Project

Project/Area Number 18540389
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field 原子・分子・量子エレクトロニクス・プラズマ
Research InstitutionTokyo Gakugei University

Principal Investigator

NITTA Hideo  Tokyo Gakugei University, Faculty of Education, Professor (50198529)

Project Period (FY) 2006 – 2007
Project Status Completed (Fiscal Year 2007)
Budget Amount *help
¥3,650,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥450,000)
Fiscal Year 2007: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000)
Fiscal Year 2006: ¥1,700,000 (Direct Cost: ¥1,700,000)
Keywordsstrone fipids / radiation / pair production / relativistic particles
Research Abstract

In this project, we have studied radiation from relativistic electrons/pasitmns and pair production by gamma-rays in inhomogeneous strong electromagnetic fields and other problems related with the vacuum stability under the critical field.
First, we have developed a theory of free-bound pair production by relativistic ions. It should be noted that when a relativistic ion enters a crystal along the major axis, the ion feels the crystal field that is equivalent to the periodic pulse of coherent photons which may be regarded as "virtual X-ray laser". At the rest frame of the ion the field strength may become beyond the critical field. In that case it is possible for the ion to produce an electron in its bound state: the bound-state pair production. This process is not only important for the investigating the strong-field QED theory but also for the application to producing antihydrogens or exotic atoms. We have calculated this process by using the plane wave for the final state of produced positron and the relativistic hydrogen like state for the final state of produced electron. By comparing our result with that of Muller, et al., which assume the use of a future X-ray laser, we have found that a crystal with realistic thickness gives larger pair production probability than that of Muller, et al..
Second, we have considered the induced type of pair production by using a wave packet under the condition that a relativistic electron enters the crystal axial electric field (10^<12>V/cm). This situation is equivalent to the Mein paradox if we see it in the electron rest frame. We have numerically calculated the motion of the wave packet for the purpose of investigating the Klein paradox type pair production Also, as a fundamental investigation, we have calculated the motion of the wave packet by using Nelson's stochastic mechanics.

Report

(3 results)
  • 2007 Annual Research Report   Final Research Report Summary
  • 2006 Annual Research Report
  • Research Products

    (8 results)

All 2008 2007

All Journal Article (4 results) (of which Peer Reviewed: 2 results) Presentation (4 results)

  • [Journal Article] Time of arrival of electrons in the double-slit experiment2008

    • Author(s)
      Hideo Nitta, Tomoshige Kudo
    • Journal Title

      PHYSICAL REVIEW A 77

    • NAID

      120007051164

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2007 Annual Research Report 2007 Final Research Report Summary
    • Peer Reviewed
  • [Journal Article] Time of arrival of electrons in the double-slit experiment2008

    • Author(s)
      Hideo Nitta and Tomoshige Kudo
    • Journal Title

      Physical Review A 77

    • NAID

      120007051164

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2007 Final Research Report Summary
  • [Journal Article] Time of arrival in the Aharonov-Bohm effect2007

    • Author(s)
      Hideo Nitta, Tomoshige Kudo
    • Journal Title

      Physica E 40

      Pages: 390-393

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2007 Annual Research Report 2007 Final Research Report Summary
    • Peer Reviewed
  • [Journal Article] Time of arrival in the Aharonov-Bohm effect2007

    • Author(s)
      Hideo Nitta and Tomoshige Kudo
    • Journal Title

      Physica E 40

      Pages: 390-393

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2007 Final Research Report Summary
  • [Presentation] Theory of crystal-assisted free-bound pair production by relativistic ions2007

    • Author(s)
      Hideo Nitta
    • Organizer
      Radiation from Relativistic Electrons in Periodic Structuresに関する第7回国際シンポジウム
    • Place of Presentation
      チェコ工科大学
    • Year and Date
      2007-09-24
    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2007 Annual Research Report 2007 Final Research Report Summary
  • [Presentation] Theory of crystal-assisted free-bound pair production by relativistic ions2007

    • Author(s)
      Hideo Nitta
    • Organizer
      The 7th International symposium on Radiation from Relativistic Electrons in Periodic Structures
    • Place of Presentation
      Prague, Czech republic
    • Year and Date
      2007-09-24
    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2007 Final Research Report Summary
  • [Presentation] 相対論的重イオンのコヒーレント束縛状態対生成2007

    • Author(s)
      新田英雄
    • Organizer
      2007年日本物理学会春季大会
    • Place of Presentation
      鹿児島大学
    • Year and Date
      2007-03-19
    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2007 Final Research Report Summary
  • [Presentation] Coherent bound-state pair production by relativistic heavy ions2007

    • Author(s)
      Hideo Nitta
    • Organizer
      Spring meeting of the Physical Society, Japan
    • Place of Presentation
      Kagoshima
    • Year and Date
      2007-03-19
    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2007 Final Research Report Summary

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Published: 2006-04-01   Modified: 2016-04-21  

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