In this paper, the measurement and covariance analysis of the cross section of ¹⁰⁰Mo (n, 2n) ⁹⁹Mo reaction, with the ¹⁹⁷Au (n, 2n)¹⁹⁶ Au reaction being used as the monitor, at the incident neutron energy of 13.9 MeV is reported. The ³H (d, n) ⁴He nuclear reaction is used as the neutron source. The experiment was performed at the Purnima neutron facility, BARC. The method of activation with off-line -ray spectrometry is used. The covariance analysis of the ¹⁰⁰Mo (n, 2n) ⁹⁹Mo reaction is also performed, for the first time, using the extended unscented transformation (EUT) technique¹, which is an extension of unscented transformation (UT) technique², for the determination of partial uncertainties arising due to attributes in combination with the micro-correlation technique of Geraldo and Smith³. The present results obtained for ¹⁰⁰Mo (n, 2n) ⁹⁹Mo reaction cross section are found to be in good agreement with EXFOR data and the theoretically calculated value using the TALYS 1. 8 code. Comparisons with the data in the available basic evaluated nuclear data libraries, such as ENDF/B-VIII.0, JEFF-3.3, JENDL-4.0, ROSFOND-2010, CENDL-3.1 and TENDL 2017 are also presented and discussed.

中文翻译：

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在入射中子能量为13.9 MeV时使用扩展无味变换技术测量100Mo（n，2n）99Mo反应截面并进行协方差分析

本文以入射中子能量为13.9时¹⁹⁷ Au（n，2n）¹⁹⁶ Au反应为监测器，对¹⁰⁰ Mo（n，2n）⁹⁹ Mo反应的截面进行测量和协方差分析。MeV被报道。的³ H（d，n）的⁴赫核反应被用作中子源。实验在BARC的Purnima中子工厂进行。使用了离线射线光谱法的活化方法。还首次使用扩展的无味变换（EUT）技术对¹⁰⁰ Mo（n，2n）⁹⁹ Mo反应进行协方差分析¹，是无味变换（UT）技术²的扩展，用于确定归因于属性的部分不确定性，并结合Geraldo和Smith ³的微相关技术。发现对于¹⁰⁰ Mo（n，2n）⁹⁹ Mo反应截面获得的当前结果与EXFOR数据和使用TALYS 1. 8代码的理论计算值高度吻合。还介绍和讨论了与可用的基本评估核数据库中数据的比较，例如ENDF / B-VIII.0，JEFF-3.3，JENDL-4.0，ROSFOND-2010，CENDL-3.1和TENDL 2017。