Isotope production in proton-, deuteron-, and carbon-induced reactions on Nb93 at 113 MeV/nucleon
Isotope production in proton-, deuteron-, and carbon-induced reactions on Nb93 at 113 MeV/nucleon
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Nb93 上 113 MeV/核子的质子、氘核和碳诱导反应中的同位素产生
DOI：
10.1103/physrevc.100.044605
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发表时间：
2019
影响因子：
3.1
通讯作者：
Kondo Yosuke et al.
中科院分区：
文献类型：
--
作者：
Nakano Keita;Watanabe Yukinobu;Kawase Shoichiro;Kondo Yosuke et al.
用反运动学方法测量了113 MeV/核子的~（113）、~（113）和~（113）C诱导的自旋反应的同位素产生截面。所测得的横截面，，所产生的诱导反应被认为是与那些由传统的活化方法所测得的一致。我们对粒子和重离子传输代码系统（PHITS）中实现的反应模型INCL-4.6，JQMD和JQMD-2.0以及核数据库JENDL-4.0/HE，TENDL-2017和ENDF/B-VIII.0进行了基准测试。模型计算也显示出一般良好的协议与测得的同位素生产横截面，-，和C-诱导的反应。结果表明，在三个核数据库中，JENDL-4.0/HE提供了与测量数据最好的一致性。我们将当前数据与先前通过相同的逆运动学方法测量的数据进行了比较（Kawaseet al.，Prog. Theor. Exp. 2017，093 D 03（2017）2050-391110.1093/ptep/ptx 110），特别关注中子壳层闭合对中子和诱导的spp反应中同位素产生的影响。结果表明，在和的同位素链中，中子数的变化引起了同位素分布的明显跳跃，而在的同位素链中没有出现这种跳跃。通过INCL-4.6GEM计算，我们发现蒸发过程中形成的跃迁被反应产生的核内级联分量所掩盖，而且，对于，元素产生截面随质子数变化的分布比对于小，因为由级联过程产生的受激Nb预碎片比受激Zr预碎片更可能发射质子，这是由于Nb同位素的质子分离能较小。
Isotope-production cross sections for-,-, and C-induced spallation reactions onat 113 MeV/nucleon were measured using the inverse-kinematics method employing secondary targets of,, and C. The measured cross sections for,,produced by-induced reactions were found to be consistent with those measured by the conventional activation method. We performed benchmark tests of the reaction models INCL-4.6, JQMD, and JQMD-2.0 implemented in the Particle and Heavy Ion Transport code System (PHITS) and of the nuclear data libraries JENDL-4.0/HE, TENDL-2017, and ENDF/B-VIII.0. The model calculations also showed generally good agreement with the measured isotope-production cross sections for-,-, and C-induced reactions. It also turns out that, among the three nuclear data libraries, JENDL-4.0/HE provides the best agreement with the measured data for the-induced reactions. We compared the presentdata with thedata, that were measured previously by the same inverse kinematics method (Kawaseet al., Prog. Theor. Exp. Phys. 2017, 093D03 (2017)2050-391110.1093/ptep/ptx110), with particular attention to the effect of neutron-shell closure on isotope production in- and-induced spallation reactions. The isotopic distributions of the measured production cross sections in thedata showed noticeable jumps at neutron numberin the isotopic chains ofand, whereas no such jump appeared in isotopic chain ofin thedata. From INCL-4.6GEM calculations, we found that the jump formed in the evaporation process is smeared out by the intranuclear cascade component inproduced by theandreactions on. Moreover, for, the distribution of the element-production cross sections as a function of the change in proton numberis shifted to smallerthan for, because the excited Nb prefragments generated by the cascade process are more likely to emit protons than the excited Zr prefragments, due to the smaller proton-separation energies of the Nb isotopes.