Study on the Possibility of Magnetic Deceleration of Neutrons

中子磁减速可能性的研究

• 批准号: 59460214
• 负责人: UTSURO Masahiko
• 金额: $ 3.01万
• 依托单位: Kyoto University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (B)
• 财政年份: 1984
• 资助国家: 日本
• 起止时间: 1984 至 1985
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-59460214/
• 关键词: Neutron deceleration; Very cold neutrons; Ultracold neutron trapping; Strong magnetic field; Adiabatic spin flip; Neutron guide tube; Multi-stage device

Due to the recent interest on the method for the effective production of ultracold neutrons(UCN)which can be used for unique fundamental physics researches, a new approach is investigated in which the magnetic deceleration of very cold neutrons(VCR)is undertaken by using a strong magnetic field coupled with the adiabatic spin flip of neutrons. In the present research, a single unit of the magnetic decelerating device was prepared having the magnitude of the magnetic field near to 10 kG and a very small gradient of the field magnitude of about 10 G/cm which should be important for the realization of the adiabatic spin flip in the magnetic field. By using these properties and the parameter values attained in the present single test unit, some numerical analyses were carried out on the pos. sible. multistage decelerator -apparatus and the expected ultracold neutron trapping performances were studied. Further, concerning the incident VCN to be supplied to the decelbrator apparatus, the VCN facility of KUR reactor was also studied after the arrangement of the new liquid deuterium cold source, and the measured intensity of VCN was much intensified by the preparation of the present cold source. In this way, the present, studies indicated the possibility and the relating necessary' condition's for the UCN trapping in the proposed magnetic decelerator device.

为了有效地产生可用于基础物理研究的超冷中子（UCN），研究了一种新的方法，即利用强磁场和中子绝热自旋翻转相结合的方法对极冷中子（VCR）进行磁减速。在本研究中，制备了单个单元的磁减速装置，其具有接近10 kG的磁场幅度和大约10 G/cm的非常小的场幅度梯度，这对于在磁场中实现绝热自旋翻转应该是重要的。利用这些性质和目前单台试验中得到的参数值，对该问题进行了数值分析。sible。研究了多级减速器装置和预期的超冷中子俘获性能。此外，对于提供给减钙装置的入射VCN，还研究了布置新的液氘冷源后KUR堆的VCN装置，并且通过制备现有的冷源使VCN的测量强度大大增强。本文的研究结果表明，在磁减速装置中实现UCN捕集的可能性和必要条件。

项目成果

宇津呂 雄彦: "超冷中性子の発生とその応用" 月刊フイジクス. 5. 135-143 (1984)

Takehiko Utsuro：“超冷中子的产生及其应用”《物理学月刊》5. 135-143 (1984)。

Masahiko UTSURO: "New Applications of Ultra Cold Neutron Physics in Magnetic and Gravity Fields" J.de Phys.C3. 269-277 (1984)

Masahiko UTSURO：“超冷中子物理在磁场和重力场中的新应用”J.de Phys.C3。

M. Utsuro: "A Possibility of Magnetic Pumping of Very Cold Neutrons in a Guide Tube Torus" Proc. Intern. Symp. Optical Applied Science and Eng.(1992)

M. Utsuro：“导管环面中极冷中子磁泵浦的可能性”Proc。

Masahiko UTSURO: "A Possibility of Magnetic Pumping of Very Cold Neutrons in a Guide Tube Torus" Proc.Internat.Symp.Optical Applied Science and Engineering. (1992)

Masahiko UTSURO：“导管环面中极冷中子磁泵浦的可能性”Proc.Internat.Symp.Optical Applied Science and Engineering。

宇津呂 雄彦: "高密度超冷中性子の生成と利用の可能性(i)生成の可能性に関する解析" 「冷中性子及び超冷中性子に関する開発と応用」ワ-クショップ会合報告書(平成2年度). I. 9-12 (1990)

宇津郎武彦：“高密度超冷中子的生产和利用的可能性（一）生产可能性分析”“冷中子和超冷中子的开发和应用”研讨会报告（1990）.I. 12 (1990)