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首页> 外文会议>1995 European school of high-energy physics >HEAVY - ELEMENT RESEARCH AT FLNR (Dubna)
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HEAVY - ELEMENT RESEARCH AT FLNR (Dubna)

机译：FLNR（杜布纳）的重元素研究

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Results of research on the synthesis and investigation of properties of heavy nuclei in the top of the Periodic chart of elements carried out by the FLNR (Dubna) - LLNL (Livermore) collaboration are presented.rnThese results have brought to the observation of a new region of nuclei stability near closed deformed shells Z=108, N=162 predicted by the macro-microscopic theoryrnThe heaviest isotopes Z=104, 106, 108 and 110 have been synthesized in hot fusion reactions of ~(238)U, ~(244)Pu and ~(248)Cm nuclei with ions of ~(22)Ne and ~(34)S. Their radioactive properties point to a substantial increase of stability with respect to spontaneous fission in the whole known region of nuclei of transfermium elements with N≤158.rnThe partial half-life for the ~(262)104 nucleus with respect to, spontaneous fission has been experimentally determined: T_(sf) = 1.2_(-0.5)~(+1.0) s. All other isotopes with Z≥106 undergo mostly the α-decay. The experimental systematics of the α-decay energies Qα(N) for all the known isotopes with Z=98-110 determines the status and strength of structural effects near closed deformed neutron shells N=152 and N=102. It is demonstrated that the calculated values of nuclei near shells N=162 are in a good agreement with the experiment.rnThe research has been carried out at the FLNR(JINR) on the beams of the U-400 heavy ion accelerator using the Dubna gas filled separator of recoils.rnThe discovery of a new region of nuclei stability near closed deformed shells allows to make more accurate assessments regarding the properties of heavier nuclides up to Z=120 and N=190. For them a much stronger effect from spherical shells Z-114 and N=180-184 is predicted which opens a possibility of further progress into the region of superheavy elements.rnFor the synthesis of isotopes of the element 114 with maximum neutron excess the ~(244)Pu(~(48)Ca,3,4n)~(289,288) 114 hot fusion reaction is considered.
机译：提出了由FLNR（杜布纳）-LLNL（利弗莫尔）合作进行的元素周期图顶部的重核合成和性质研究的结果。这些结果为新区域的观测提供了条件宏观微观理论预测的闭合形变壳Z = 108，N = 162附近的核稳定性的定量分析在〜（238）U，〜（244）的热聚变反应中合成了最重的同位素Z = 104、106、108和110 Pu和〜（248）Cm原子核，离子为〜（22）Ne和〜（34）S。它们的放射性性质表明，在整个已知的N≤158的transfer元素原子核区域中，自发裂变的稳定性大大提高。〜（262）104原子核相对于自发裂变的部分半衰期为实验确定：T_（sf）= 1.2 _（-0.5）〜（+1.0）s。 Z≥106的所有其他同位素大多经历α衰变。 Z = 98-110的所有已知同位素的α衰变能量Qα（N）的实验系统确定了闭合变形中子壳N = 152和N = 102附近结构效应的状态和强度。结果表明，N = 162壳层附近核的计算值与实验结果吻合良好。rn研究了使用杜布纳气体在FLNR（JINR）上对U-400重离子加速器的射束进行的研究。在闭合的变形壳附近发现了一个新的核稳定性区域，这使得人们可以对Z = 120和N = 190以下的较重核素的性质进行更准确的评估。对于它们来说，预测了球形壳Z-114和N = 180-184的强得多的作用，这为进一步发展进入超重元素区域提供了可能性。对于合成中子最大的元素114同位素，〜（ 244）Pu（〜（48）Ca，3,4n）〜（289,288）114被认为是热聚变反应。

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