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arXiv 2202.11802nucl-ex
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$^{253}$ Rf的Fission性质和缺中子Rf同位素的稳定性

Fission properties of $^{253}$Rf and the stability of neutron-deficient Rf isotopes

A. Lopez-Martens, K. Hauschild, A. I. Svirikhin, Z. Asfari, M. L. Chelnokov, V. I. Chepigin, O. Dorvaux, M. Forge, B. Gall, A. V. Isaev, I. N. Izosimov, K. Kess… 展开作者

A. Lopez-Martens, K. Hauschild, A. I. Svirikhin, Z. Asfari, M. L. Chelnokov, V. I. Chepigin, O. Dorvaux, M. Forge, B. Gall, A. V. Isaev, I. N. Izosimov, K. Kessaci, A. A. Kuznetsova, O. N. Malyshev, R. S Mukhin, A. G. Popeko, Yu. A. Popov, B. Sailaubekov, E. A. Sokol, M. S. Tezekbayeva, A. V. Yeremin

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摘要：

最近的实验数据分析[J. Khuyagbaatar等人，Phys. Rev. C 104，L031303（2021）]已经确定了$^{253}$ Rf中存在两种裂变状态：该基态和一个低位异构态，最有可能涉及与较轻的同位素$^{251}$ No中相同的中子单粒子构型。在$^{253}$ Rf中测量的裂变半衰期的比率用于预测1/2 $^{+}$同分异构态在$^{251}$ No中的分布，并得出了更轻Rf体系的抗裂变稳定性的结论。本文重点再次对裂变性能的$^{253}$ Rf和其他中子缺乏同位素的稳定性的影响，使用新的和改进的数据收集的两个实验中进行的核反应在俄罗斯杜布纳的弗莱罗夫实验室。在$^{253}$ Rf的情况下，测量了半衰期为52.8（4.4）$~μ$ s和9.9（1.2）ms的两个裂变活性，证实了J. Kkuyagbaatar等人的结果。通过检测其电磁衰变到52.8 $~μ$ s状态，还观察到了激发能高得多的第三个状态。这一观察结果导致裂变态的量子构型分配与J. Khuyagbaatar等人建立的相反，即较高自旋的状态具有最短的裂变半衰期。在同位素$^{251}$ No中，没有观察到来自低自旋异构体的任何实质性裂变分支，从而证实了低自旋和高自旋态之间的裂变阻碍比的反转。

英文摘要：

An analysis of recent experimental data [J. Khuyagbaatar et al., Phys. Rev. C 104, L031303 (2021)] has established the existence of two fissioning states in $^{253}$Rf: the ground state and a low-lying isomeric state, most likely involving the same neutron single-particle configurations as in the lighter isotone $^{251}$No. The ratio of fission half-lives measured in $^{253}$Rf was used to predict the fission properties of the 1/2$^{+}$ isomeric state in $^{251}$No and draw conclusions as to the stability against fission of even lighter Rf systems. This paper focusses again on the fission properties of $^{253}$Rf and their impact on the stability of other neutron deficient isotopes, using new and improved data collected from two experiments performed at the Flerov Laboratory of Nuclear Reactions in Dubna, Russia. Two fission activities with half-lives of 52.8(4.4)$~μ$s and 9.9(1.2) ms were measured in the case of $^{253}$Rf, confirming the results of J. Kkuyagbaatar et al. A third state, at much higher excitation energy, was also observed through the detection of its electromagnetic decay to the 52.8$~μ$s state. This observation leads to the opposite quantum-configuration assignments for the fissioning states as compared to the ones established by J. Khuyagbaatar et al., namely that the higher-spin state has the shortest fission half-life. This inversion of the ratio of fission hindrances between the low and high-spin states is corroborated in the isotone $^{251}$No by the non observation of any substantial fission branch from the low-spin isomer.

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