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首页> 外文期刊>Physical review, C >Measurement of the U-238(n,gamma) cross section up to 80 keV with the Total Absorption Calorimeter at the CERN n_TOF facility
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Measurement of the U-238(n,gamma) cross section up to 80 keV with the Total Absorption Calorimeter at the CERN n_TOF facility

机译：测量U-238（N，GAMMA）横截面高达80 keV，CENN N_TOF设施的总吸收量热计

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摘要

The radiative capture cross section of a highly pure (99.999%), 6.125(2) grams and 9.56(5) x 10(-4) atoms/barn areal density U-238 sample has been measured with the Total Absorption Calorimeter (TAC) in the 185 m flight path at the CERN neutron time-of-flight facility n_TOF. This measurement is in response to the NEA High Priority Request list, which demands an accuracy in this cross section of less than 3% below 25 keV. These data have undergone careful background subtraction, with special care being given to the background originating from neutrons scattered by the 238U sample. Pileup and dead-time effects have been corrected for. The measured cross section covers an energy range between 0.2 eV and 80 keV, with an accuracy that varies with neutron energy, being better than 4% below 25 keV and reaching at most 6% at higher energies.
机译：通过总吸收量热计（TAC）测量了高纯度（99.999％），6.125（2）克和9.56（5）×10（-4）原子样品的辐射捕获横截面已测量原子/谷仓面密度U-238样品 在Cern中子飞行时间N_TOF的185米飞行路径中。 该测量响应于NEA高优先级请求列表，该横截面要求低于25keV的横截面的准确性。 这些数据经历了仔细的背景减法，特别注意源自由238U样品分散的中子的背景。 堆积和死亡时间效应已得到纠正。 测量的横截面覆盖0.2eV和80 keV之间的能量范围，精度随着中子能量而变化，优于4％以下低于25keV，并且在较高的能量下至多6％达到至多6％。

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