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报道了经仔细设计的 15 0MeV6He +9Be实验 ,并在质心系大角度处测量 10 Be和 11Be同位素产物的实验数据 .鉴别得到相应于单中子转移的 371个 10 Be事件 ,同时观测到了相应于双中子转移的 5个 11Be事件 .由此得到相应微分截面分别为 (0 .11± 0 .0 2 )mb sr(θcm≈ 137.4°)和 (1.0± 0 .7)μb sr(θcm≈ 133.4°) ,结果表明在所研究的反应体系中 ,单中子转移截面要比双中子转移截面约大10 0倍 .在 6He由 5He n和α 2n组成的集团模型下 ,利用零力程扭曲波玻恩近似 (DWBA)的计算程序 ,在数量级上重现了单、双中子转移反应的实验数据
The well-designed 15 0MeV6He + 9Be experiment was reported and experimental data for isotope production of 10 Be and 11 Be were measured at large angles of the center of mass system. 371 10 Be events corresponding to single neutron transfer were identified and observed corresponding to Five neutrons transfer 11Be events, resulting in corresponding differential cross sections of (0.11 ± 0.02) mb sr (θcm≈137.4 °) and (1.0 ± 0.7) μb sr (θcm≈133.4 °), the results show that the single neutron transfer cross section is about 10 times larger than the double neutron transfer cross section in the studied reaction system.With the model of 6He composed of 5He n and α 2n, The Boehringer’s approximation (DWBA) calculation program reproduces on the order of magnitude experimental data for single and double neutron transfer reactions