arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1005.2736hep-exnucl-ex
收藏

根据GEMMA谱仪三年数据的中微子磁矩上限

Upper limit on the neutrino magnetic moment from three years of data from the GEMMA spectrometer

A. G. Beda, V. B. Brudanin, V. G. Egorov, D. V. Medvedev, V. S. Pogosov, M. V. Shirchenko, A. S. Starostin

摘要:

本文介绍了在加里宁核电站用GEMMA谱仪进行的三年中微子磁矩测量结果。研究了反中微子电子散射。光谱仪中使用了一个1.5公斤的HPGe探测器,放置在距离第3吉瓦反应堆堆芯中心13.9米处。反中微子通量为2.7x10^13 1/cm^2/s。本文采用微分法提取了新的电磁散射同相轴。比较了反应堆开、停堆期间分别在5184+6798和1853+1021小时内拍摄的散射电子能谱。在CL为90%时,有和没有原子电离机制的中微子磁矩上限分别为5.0 × 10 ^-12和3.2 × 10 ^-11玻尔磁子。

英文摘要:

The result of the 3-year neutrino magnetic moment measurement at the Kalinin Nuclear Power Plant with the GEMMA spectrometer is presented. Antineutrino-electron scattering is investigated. A HPGe detector of 1.5 kg placed at a distance of 13.9 m from the centre of the 3 GW_th reactor core is used in the spectrometer. The antineutrino flux is 2.7x10^13 1/cm^2/s. The differential method is used to extract nu-e electromagnetic scattering events. The scattered electron spectra taken in 5184+6798 and 1853+1021 hours during the reactor ON and OFF periods respectively are compared. The upper limits for the neutrino magnetic moment with and without atomic ionization mechanism were found to be 5.0x10^-12 and 3.2x10^-11 Bohr magnetons at 90% CL, respectively.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑