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arXiv 0910.0779nucl-ex
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中子辐射衰变的新实验

New experiment on the neutron radiative decay

R. U. Khafizov, I. A. Kolesnikov, S. V. Tolokonnikov, V. D. Torokhov, V. A. Solovei, M. R. Kolhidashvili, I. A. Konorov

摘要:

该报告致力于准备的新实验的中子辐射衰变是什么进行了最后几年。2002年在ILL进行的实验开始了这一中子衰变分支的实验研究,并于2005年在慕尼黑工业大学的FRMII反应堆的第二和第三周期继续进行另一项实验。在第一个实验中,我们成功地测量了相对强度(B.R.)的上限。在第二个实验中,我们成功地发现了辐射中子衰变的事件,并测量了它的B.R.= (3.2+-1.6 10 -3(C.L.= 99.7%,伽马量子能量超过35 keV)。获得的平均B.R.值约为先前在标准电弱模型框架内计算的理论值的两倍。然而,由于显著的实验误差,根据这一发现初步推断已经观察到了与标准模型的偏差。为了证明或反驳偏差的存在,有必要进行一个新的实验,该实验将允许以1%的精度测量定时光谱中的辐射峰值。到目前为止,我们已经准备了一个新的实验,其主要结果将是测量B.R.对于中子衰变的辐射分支的精确度。

英文摘要:

The report is dedicated to the preparation of the new experiment on the neutron radiative decay what is conducted for the last years. We started the experimental research of this neutron decay branch with the experiment conducted at ILL in 2002 and continued in another experiment at the second and third cycles at the FRMII reactor of the Technical University of Munich in 2005. In the first experiment we succeeded in measuring only the upper limit on the relative intensity (B.R.) of the radiative neutron decay and in the second we succeeded in discovering events of radiative neutron decay and measure its B.R.=(3.2+-1.6)10-3 (with C.L.=99.7% and gamma quanta energy over 35 keV). The obtained average B.R. value was approximately twice the theoretical value calculated earlier within the framework of the standard electroweak model. However, due to significant experimental error it would be preliminary to deduce that based on this finding a deviation from the standard model has been observed. To prove or disprove the existence of a deviation it is necessary to conduct a new experiment that would allow to measure the radiative peak in timing spectra with precision in the order of 1%. By the present time we have prepared a new experiment the main result of which would be the measurement of B.R. for the radiative branch of neutron decay with this precision.

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。

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