Towards the Discovery of New Elements: Production of Livermorium (Z=116) with 50Ti

arXiv - PHYS - Nuclear Experiment Pub Date : 2024-07-22 DOI:arxiv-2407.16079

J. M. Gates, R. Orford, D. Rudolph, C. Appleton, B. M. Barrios, J. Y. Benitez, M. Bordeau, W. Botha, C. M. Campbell, J. Chadderton, A. T. Chemey, R. M. Clark, H. L. Crawford, J. D. Despotopulos, O. Dorvaux, N. E. Esker, P. Fallon, C. M. Folden III, B. J. P. Gall, F. H. Garcia, P. Golubev, J. A. Gooding, M. Grebo, K. E. Gregorich, M. Guerrero, R. A. Henderson, R. -D. Herzberg, Y. Hrabar, T. T. King, M. Kireeff Covo, A. S. Kirkland, R. Krücken, E. Leistenschneider, E. M. Lykiardopoulou, M. McCarthy, J. A. Mildon, C. Müller-Gatermann, L. Phair, J. L. Pore, 1 E. Rice, K. P. Rykaczewski, B. N. Sammis, L. G. Sarmiento, D. Seweryniak, D. K. Sharp, A. Sinjari, P. Steinegger, M. A. Stoyer, J. M. Szornel, K. Thomas, D. S. Todd, P. Vo, V. Watson, P. T. Wooddy

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Abstract

The $^{244}$Pu($^{50}$Ti,$xn$)$^{294-x}$Lv reaction was investigated at Lawrence Berkeley National Laboratory's 88-Inch Cyclotron facility. The experiment was aimed at the production of a superheavy element with $Z\ge 114$ by irradiating an actinide target with a beam heavier than $^{48}$Ca. Produced Lv ions were separated from the unwanted beam and nuclear reaction products using the Berkeley Gas-filled Separator and implanted into a newly commissioned focal plane detector system. Two decay chains were observed and assigned to the decay of $^{290}$Lv. The production cross section was measured to be $\sigma_{\rm prod}=0.44(^{+58}_{-28})$~pb at a center-of-target center-of-mass energy of 220(3)~MeV. This represents the first published measurement of the production of a superheavy element near the `Island-of-Stability', with a beam of $^{50}$Ti and is an essential precursor in the pursuit of searching for new elements beyond $Z=118$.

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发现新元素：用 50Ti 生产 Livermorium (Z=116)

劳伦斯伯克利国家实验室的88英寸回旋加速器设施研究了$^{244}$Pu($^{50}$Ti,$xn$)$^{294-x}$Lv反应。该实验的目的是通过用比^{48}$Ca重的束流辐照锕系元素靶，生产出Z/ge 114$的超重元素。利用伯克利气体填充分离器将产生的Lv离子与无用的光束和核反应产物分离，并植入新启用的焦平面探测器系统。在220(3)~MeV的目标中心质量中心能量下，测量到的产生截面为：$\sigma_\rm prod}=0.44(^{+58}_{-28})$~pb 。这是首次公开发表的用一束^{50}$钛在 "稳定岛 "附近产生超重元素的测量结果，是寻找Z=118$以外新元素的重要先导。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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arXiv - PHYS - Nuclear Experiment

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