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Isomeric fission yield ratios for odd-mass Cd and In isotopes using the phase-imaging ion-cyclotron-resonance technique

机译:使用相位成像离子 - 回旋 - 谐振技术的奇数质量Cd和同位素中的异构裂变率比

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摘要

Isomeric yield ratios for the odd-A isotopes of Cd119-127 and In119-127 from 25-MeV proton-induced fission on natural uranium have been measured at the JYFLTRAP double Penning trap, by employing the phase-imaging ion-cyclotron-resonance technique. With the significantly improved mass resolution of this novel method isomeric states separated by 140 keV from the ground state, and with half-lives of the order of 500 ms, could be resolved. This opens the door for obtaining new information on low-lying isomers, which are important for nuclear structure, fission, and astrophysics. In the present work the experimental isomeric yield ratios are used for the estimation of the root-mean-square angular momentum J(rms) of the primary fragments. The results show a dependency on the number of unpaired protons and neutrons, where the odd-Z In isotopes carry larger angular momenta. The deduced values of J(rms) display a linear relationship when compared with the electric quadrupole moments of the fission products.
机译:通过采用相位成像离子 - 回旋 - 共振技术,在Jyfltrap Double-Recning-Arronance技术下测量了CD119-127的奇数同位素和来自25mev质子诱导的天然铀的裂变的异常的异常铀的异常率。 。随着这种新方法的显着改善的质量分辨率,异构状态从地面状态分开140keV,可以解决500ms的半衰期。这将打开门,以获得关于低洼异构体的新信息,这对于核结构,裂变和天体物理学很重要。在本工作中,实验性异构率比用于估计初级片段的根均方角动量J(RMS)。结果表明了对未配对的质子和中子的数量的依赖性,其中同位素中的奇Z呈现较大的角动度。与裂变产品的电动四极震动相比,J(rms)的推导值显示线性关系。

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