Precision neutron flux measurement with a neutron beam monitor

International Workshop on Neutron Optics and Detectors

Ino, T.^1 ; Otono, H.^2 ; Mishima, K.^3 ; Yamada, T.^3

KEK, High Energy Accelerator Research Organization, Tsukuba, Japan^1

Kyushu University, Fukuoka, Japan^2

University of Tokyo, Tokyo, Japan^3

关键词: Beam lines;    Beam monitor;    Experimental conditions;    Flux measurements;    Gas neutron;    Neutron intensities;    Neutron lifetime;    Systematic uncertainties;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/528/1/012039/pdf
DOI  :  10.1088/1742-6596/528/1/012039

来源: IOP

【 摘 要 】

Neutron beam monitors are regularly used in various neutron beam experiments to compare two or more sets of data taken in different experimental conditions. A neutron lifetime experiment at BL05, the NOP beamline, in J-PARC requires to monitor the initial neutron intensity with an precision of 0.1% to measure the neutron lifetime with the same accuracy. The performance of a thin3He gas neutron beam monitor used for the experiment was studied to estimate the systematic uncertainties in the neutron lifetime measurement.