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1996 Fiscal Year Final Research Report Summary

Application of the Compton backscattering laser light to study the nuclear astrophysics

Research Project

Project/Area Number 07454048
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Research Field 素粒子・核・宇宙線
Research InstitutionTOKYO INSTITUTE OF TECHNOLOGY

Principal Investigator

ASAHI Koichiro  Tokyo Inst.Tech.Appl.Physics Asosiate Professor, 理学部, 助教授 (80114354)

Co-Investigator(Kenkyū-buntansha) NOGUCHI Tutomu  Department of Quantum Radiation Electrotechnical Laboratory, 量子放射部, 主任研究官
Project Period (FY) 1995 – 1996
Keywordsdeuteron photo-disintegration / Compton backscattering of laser / drift chamber / meson exchange currents / ciuculary polarized light / angular distribution / trajectory of charged particle
Research Abstract

1) Construction of the time projection chamber.
The time projection chamber was newly constructed. Since the deuteron gas target costs very much, and also the energy of the proton emitted from the deuteron photodisintegration is very low leading to the short stopping range, we had to develop the chamber, which can be operated at low pressure of the gas target. Therefore, the chamber should be evacuated up to the extremely high vacuum with very few leakage.
2) Performance of the time projection chamber :
the performance of the time projection chamber was studied by using the alpha-ray source as discussed below.
2.1) Detection efficiency of the charged particle ;
The efficiency was more than 99.5% under the following conditions of the chambar. Namely, the high voltages of the anode wire and field wire were +1500V and -2000V,respectively at the gas presure of 700 torr.
2.2) Drift velocity ;
The average velocity was about 0.55(3)cm/micro seconds, and it depends on the strength of the electric field.
2.3) Energy resolution ;
The resolution was 5.8% for the signal of the energy loss of 67 keV,and the linearity of the pulse height vs. the energy was quite good.
2.4) Time resolution ;
The time resolution was 32 nano-seconds, which corresponds to the position resolution of the z-direction of 0.18 mm.
3). Construction of the purified gas circulating system :
In order to operate the time projection chamber・properly it should be used in the experimental conditions free from the impurity gas, caused either by the leakage of the system or the out gas of the system. Therefore, we constructed the closed gas circulating system with the gas purified equipment, and thereby we can provide the purified gas to the chamber. Consequently, the chamber can be used for a long term experiment without having any problem.
4). Construction of the data taking system :
The data taking program was made.

  • Research Products

    (14 results)

All Other

All Publications (14 results)

  • [Publications] H.Izumi, K.Asahi, H.Okuno et a1: "Electric quadrupole moments of neutron-rich nuclei ^<14>B and ^<15>B" Phys.Lett.B. 366. 51-55 (1996)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] H.Ueno, K.Asahi, H.Isumi et al: "Magnetic moments of ^<17>N and ^<17>B" Phys,Rev.C. 53. 2142-2151 (1996)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] H.Izumi, K.Asahi, H.Ueno et al: "Measurement of electric quadrupole moments of neutron-rich nuclei ^<14>B and ^<15>B" Hyperfine Int.97/98. 509-517 (1996)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] K.Asahi: "Electromagnetic moments of neutron-rich nuclei measured with spin-polarizedradioactive beams" Proceedings of the Second Japan-Italy Joint Symposium on Perspective in Heavy Ion Physics. 355-368 (1996)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] K.Asahi: "Nuclear moments and fundamental laws studied with spin-polarized nuclei" International Workshop on Polarized 3He Beams and Gas Targents,and Their Applacation,Kobe,Japan. (1997)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] H.Sato, M.Tsuda, A.Yoshimi, K.Asahi et al: "Polarized ^<129>Xe solid for polarizing unstable nuclei" International Workshop on Polarized ^3He Beams and Gas Targets,and Their Applacation,Kobe,Japan. (1997)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] K.Sakai, H.Sato, A.Yoshimi, K.Asahi et al: "Development of polarized ^3He gas system as a spin analyzer for low energy neutrons" International Workshop on Polarized ^3He Beams and Gas Targets,and Their Applacation,Kobe,Japan. (1997)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] H.Izumi, K.Asahi, H.Okuno et al: "Electric quadrupole moments of neutron-rich nuclei ^<14>B and ^<15>B" Phys.Lett.B. 366. 51-55 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] H.Ueno, K.Asahi, H.Isumi et al: "Magnetic moments of ^<17>N and ^<17>B" Phys, Rev. C53. 2142-2151 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] H.Izumi, K.Asahi, H.Ueno et al: "Measurement of electric quadrupole moments of neutron-rich nuclei ^<14>B and ^<15>B" Hyperfine Int. 97/98. 509-517 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] K.Asahi: "Electromagnetic moments of neutron-rich nuclei measured with spin-polarized redioactive beams" Proceedings of the Second Japan-Italy Joint Symposium on Perspective in Heavy Ion Physics. 355-368 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] K.Asahi: "Nuclear moments and fundamental laws studied with spin-polarized nuclei" International Workshop on Polarized 3He Beams and Gas Targets, and Their Applacation, Kobe, Japan. (1997)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] H.Sato, M.Tsuda, A.Yoshimi, K.Asahi et al: "Polarized ^<129>Xe solid for polarizing unstable nuclei" International Workshop on Polarized ^3He Beams and Gas Targets, and Their Applacation, Kobe, Japan. (1997)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] K.Sakai, H.Sato, A.Yoshimi, K.Asahi et al: "Development of polarized ^3He gas system as a spin analyzer for low energy neutrons" International Workshop on Polarized ^3He Beams and Gas Targets, and Their Applacation, Kobe, Japan. (1997)

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

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Published: 1999-03-16  

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