【摘要】 本文报道了E_n=13.5—14.8MeV中子能区几个长寿命生成核的（n,2n）反应截面的测量。测量方法是以⁹³Nb（n,2n）^92mNb反应截面为中子注量标准的相对活化法。测量的几个反应为:¹⁵¹Eu（n,2n）^150mEu、¹⁵³Eu（n,2n）¹⁵²Eu、¹⁵⁹Tb（n,2n）¹⁵⁸Tb和¹⁰⁹Ag（n,2n）^*108)mAg。中子能量是用铌锆截面比法测定的。本文的结果和已收集到的测量结果进行了比较。更多还原

【Abstract】 Measurement of （n, 2n） reaction cross sections for some nuclides, whose residues have long half-lives, is described. The activation method relative to the ⁹³Nb （n,2n）^92mNb reaction cross section was used. The cross sections of the ¹⁵¹Eu （n, 2n）^150mEu,¹⁵³Eu（n, 2n）¹⁵²Eu, ¹⁵⁹Tb（n, 2n）¹⁵⁸Tb and ¹⁰⁹Ag（n, 2n）^108mAg reactions in the neutron energy range of 13.50—14.80 MeV were measured. The neutron energies in this experiment were determined by means of the method of cross section ratios for ⁹⁰Zr（n,2n）^80m+gZr and ⁹³Nb（n,2n）^92mNb reactions. The results obtained were compared with other existing data.更多还原