Experiments on the synthesis of element 115 in the reaction 243 Am ( 48 Ca ,xn) 291-x 115
Experiments on the synthesis of element 115 in the reaction 243 Am ( 48 Ca ,xn) 291-x 115
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DOI：
10.1103/physrevc.69.021601
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发表时间：
2004-02
影响因子：
3.1
通讯作者：
Y. Oganessian;V. K. Utyonkoy;Y. Lobanov;F. Abdullin;A. Polyakov;I. V. Shirokovsky;Y. Tsyganov;G. G
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文献类型：
--
作者：
Y. Oganessian;V. K. Utyonkoy;Y. Lobanov;F. Abdullin;A. Polyakov;I. V. Shirokovsky;Y. Tsyganov;G. G
本文介绍了用化学反应合成115号元素同位素的实验结果。用一束剂量的射弹，我们观察到三条类似的衰变链，由五个连续的衰变组成，所有衰变都在大约的时间间隔内被检测到，并在稍后的时间由具有高能释放（总动能）的自发裂变终止。在更高的轰击能量下，在等束剂量下，我们记录到一个不同的衰变链，在大约的时间间隔内检测到四个连续的衰变，也由自发裂变终止。给出了九个新衰变核的衰变能和半衰期。这些合成核的衰变性质与新元素115的母同位素产生的连续衰变一致，并且分别在截面约为和的蒸发通道中产生。新奇核的放射性性质与宏观-微观理论的预测进行了比较。实验在U400回旋加速器上进行，反冲分离器为DGFRS。
The results of experiments designed to synthesize element 115 isotopes in thereaction are presented. With a beam dose ofprojectiles, we observed three similar decay chains consisting of five consecutivedecays, all detected in time intervals of aboutand terminated at a later time by a spontaneous fission with a high-energy release (total kinetic energy). At a higher bombarding energy of, with an equalbeam dose, we registered a different decay chain of four consecutivedecays detected in a time interval of about, also terminated by spontaneous fission. Thedecay energies and half-lives for nine new-decaying nuclei are given. The decay properties of these synthesized nuclei are consistent with consecutivedecays originating from the parent isotopes of the new element 115,and, produced in the- and-evaporation channels with cross sections of aboutand, respectively. The radioactive properties of the new odd-nucleiare compared with the predictions of the macroscopic-microscopic theory. The experiments were carried out at the U400 cyclotron with the recoil separator DGFRS at FLNR, JINR.