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Neutron β decay with Ultracold neutrons

Research Project

Project/Area Number 12304014
Research Category

Grant-in-Aid for Scientific Research (A)

Allocation TypeSingle-year Grants
Section一般
Research Field 素粒子・核・宇宙線
Research InstitutionThe High Energy Accelerator Research Organization

Principal Investigator

MASUDA Yasuhiro  KEK IPNS Associate Professor, 素粒子原子核研究所, 助教授 (60150009)

Co-Investigator(Kenkyū-buntansha) KIYANASI Yoshiaki  Hokkaido University Professor, 工学部, 教授 (80002202)
INO Takashi  KEK IMSS Research Associate, 物質構造科学研究所, 助手 (10301722)
MUTO Sugure  KEK IMSS Research Associate, 物質構造科学研究所, 助手 (90249904)
HIGUCHI Hasato  Tohoku-gakuin University Professor, 工学部, 教授 (60048791)
川端 祐司  京都大学, 原子炉実験所, 助教授 (00224840)
能町 正治  大阪大学, 理学部, 教授 (90208299)
Project Period (FY) 2000 – 2002
Project Status Completed (Fiscal Year 2002)
Budget Amount *help
¥47,420,000 (Direct Cost: ¥41,000,000、Indirect Cost: ¥6,420,000)
Fiscal Year 2002: ¥4,940,000 (Direct Cost: ¥3,800,000、Indirect Cost: ¥1,140,000)
Fiscal Year 2001: ¥22,880,000 (Direct Cost: ¥17,600,000、Indirect Cost: ¥5,280,000)
Fiscal Year 2000: ¥19,600,000 (Direct Cost: ¥19,600,000)
KeywordsY.Masuda et al. / Spallcition Ultracold-Neutron Production in Superffuid Helium / Phys,Rev.Lett / 89 / 24801 / 2002
Research Abstract

The aim of this research work was to carry out a β decay experiment with ultracold neutrons (UCN). High density UCN are highly desirable for the UCN experiment. We have studied UCN production in superfluid helium (He-II) with spallation neutrons. Based on this study, we built a spallation neutron source, thermal and cold neutron moderators with heavy water and a He-II cryostat for the UCN production. We succeeded in the UCN production and observation in the new generation UCN source. We confirmed the UCN observation by placing a complete reflector for UCN in front of a UCN detector and changing the temperature of He-II. UCN counts varied as it was expected. We studied a UCN detector efficiency and then obtained a UCN density in a experimental bottle. The value was 1.4 UCN/cm^3 for UCN energies less than 100 neV at a proton beam power of 156 W. The UCN density is competitive to UCN density at Grenoble which is largest in the world. We expect the UCN density will be larger than 10000 UCN/cm^3 by improvement of the proton beam power, the He-II ctyostat and aneutron moderator reflector configuration. We published the result in Phys. Rev. Lett.
Ultracold Neutron
Symmetry

Report

(4 results)
  • 2002 Annual Research Report   Final Research Report Summary
  • 2001 Annual Research Report
  • 2000 Annual Research Report
  • Research Products

    (2 results)

All Other

All Publications (2 results)

  • [Publications] Y.Masuda et al.: "Spallation Ultracold-Neutron Production in Superfluid Helium"Phys. Rev. Lett.. 89. 24801 (2002)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] Y.Masuda et al.: "Spallation Ultracold-Neutron Production in Superfluid Helium"Phys.Rev.Lett.. 89. 284801-1-284801-4 (2002)

    • Related Report
      2002 Annual Research Report

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Published: 2000-04-01   Modified: 2016-04-21  

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