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首页> 外文期刊>Physical review, C >Mass and isotopic yield distributions of fission-like events in the F-19 + Tm-169 system at low energies
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Mass and isotopic yield distributions of fission-like events in the F-19 + Tm-169 system at low energies

机译：在低能量下F-19 + TM-169系统中的裂变事件的质量和同位素产量分布

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In the present work, 22 fission-like residues with mass number 67 = A = 156 produced via complete fusion-fission and/or incomplete fusion-fission have been identified and their production cross sections measured at three projectile energies, viz., 92.0 +/- 1.8, 102.5 +/- 1.5, and 105.4 +/- 1.6 MeV in the F-19 + Tm-169 system. The absolute cross section of each fission-like residue is measured by recoil-catcher activation technique using offline gamma-ray spectroscopy. The data have been analyzed to deduce the parameters for isotopic yield and isobaric charge distributions. The deduced isotopic yields for indium (In-107,In-108,In-109,In-110m) and neodymium (Nd-134,Nd-135,Nd-137,Nd-139) isotopes are reproduced by Gaussian distribution and their variance is in good agreement with that reported in literature. The mass distributions of fission-like residues at three energies are also found to be Gaussian peaked, which confirms their production via deexcitation of a compound nucleus through complete fusion-fission and/or incomplete fusion-fission processes. It has been observed that, the mass variance (sigma(2)(M)) values of fission fragments for two different systems, C-12 + Tm-169 and F-19 + Tm-169, at nearly the same excitation energy and angular momentum are distinctly different, indicating the importance of the entrance channel effect in fission reaction dynamics. The theoretically calculated isobaric charge dispersion parameters for these residues are found to be in good agreement with those obtained from the experimental data.
机译：在本作工作中，已经识别出通过完全融合裂变和/或不完全融合产生的22个裂变样残留物，并通过完全融合和/或不完全融合产生，并在三个射弹能量上测量它们的生产横截面在F-19 + TM-169系统中，92.0 +/- 1.8,102.5 +/- 1.5和105.4 +/- 1.6 MEV。通过使用离线γ射线光谱法通过反冲捕集器活化技术测量每个裂变残留物的绝对横截面。已经分析了数据以推导出同位素产量和等异电荷分布的参数。推导的铟的同位素产率（In-107，108中，109中，110M，110M）和钕（ND-134，ND-135，ND-137，ND-137，ND-139）同位素被高斯分布及其转载差异与文学中报告的同意吻合良好。在三个能量下的裂变残留物的质量分布也被发现是高斯峰值，通过完全融合裂变和/或不完全的融合过程来证实它们的化合物核的脱尿。已经观察到，两个不同系统的裂变片段的质量差异（Sigma（2）（m）），C-12 + Tm-169和F-19 + Tm-169，在几乎相同的激励能量和角动量明显不同，表明入口通道效应在裂变反应动态中的重要性。发现这些残基的理论上计算的等因素电荷分散参数与从实验数据中获得的那些吻合良好。

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