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In this work, the β-stable region for Z 90 is proposed based on a successful binding energy formula.The calculated β-stable nuclei in the β-stable region are in good agreement with the ones obtained by Mo¨ller et al. The half-lives of the nuclei close to the β-stable region are calculated and the competition between α-decay andβ-decay is systematically investigated. The calculated half-lives and the suggested decay modes are well in line with the experimental results. The decay modes are mostly β--decay above the β-stable region. Especially for Z 111,all the decay modes are β--decay. Regarding the nuclei above the β-stable region, α-decay and β--decay(α+β-)can occur simultaneously when Z 112. This is a very interesting phenomenon. The competition between α-decay and β-decay is very complex and drastic below the β-stable region. The predictions for half-lives and decay modes of the nuclei with Z =107–110 are presented in detail. 相似文献
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当今世界,科学技术突飞猛进,国力竞争日趋激烈.这一切对人才的综合素质提出了更高更新的要求,日渐成为我国教育工作者面临的新课题.而对这样一个社会各个方面更新的时代,大学对人才的培养更多地要着眼于具有创造性综合能力素质上.正如诺贝尔物理学奖获得者劳厄(M.v.Laue)所 相似文献
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Proton radioactivity has been investigated using the effective liquid drop model with varying mass asymmetry shapes and effective inertial coefficients. An effective nuclear radius constant formula replaces the old empirical one in the calculations. The theoretical half-lives are in good agreement with the available experimental data. All the deviations between the calculated logarithmic half-lives and the experimental values are less than 0.8.The root-mean-square(rms) deviation is 0.523. Predictions for the half-lives of proton radioactivity are made for elements across the periodic table. From the theoretical results, there are 11 candidate nuclei for proton radioactivity in the region Z <51. In the region Z >83, no nuclei are suggested as probable candidate nuclei for proton radioactivity within the selected range of half-lives studied. 相似文献
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真空退火对Nd_(0.7)Sr_(0.3)MnO_3外延膜结构和输运性影响 总被引:1,自引:0,他引:1
本文研究了真空退火对Nd0.7 Sr0.3 MnO3(NSMO)外延膜的结构和输运性的影响.X-射线衍射(XRD)和电阻率测量结果显示,随着退火温度的升高,NSMO薄膜单胞沿着c-轴方向拉长,电阻率随退火温度的升高而增大,同时金属-绝缘体转变温度(Tp)降低.上述结果归因于真空退火引起的氧缺失导致了Mn3+/Mn4+离子比例的增大及MnO6八面体的畸变.Kroger-vink的缺陷反应式定性的解释了氧缺失与输运性的关系. 相似文献
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In this work, the β-stable region for Z≥90 is proposed based on a successful binding energy formula. The calculated β-stable nuclei in the β-stable region are in good agreement with the ones obtained by Möller et al. The half-lives of the nuclei close to the β-stable region are calculated and the competition between α-decay and β-decay is systematically investigated. The calculated half-lives and the suggested decay modes are well in line with the experimental results. The decay modes are mostly β--decay above the β-stable region. Especially for Z≤111, all the decay modes are β--decay. Regarding the nuclei above the β-stable region, α-decay and β--decay (α+β-) can occur simultaneously when Z≥112. This is a very interesting phenomenon. The competition between α-decay and β-decay is very complex and drastic below the β-stable region. The predictions for half-lives and decay modes of the nuclei with Z=107-110 are presented in detail. 相似文献
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利用有效液滴模型计算了超铅区结团放射半衰期.在计算Gamow势垒穿透因子时采用了碎块体积不守恒以及有效惯性系数因子,并用有效的核半径常数公式代替原来的经验公式.理论计算得到的结团放射半衰期和实验值符合得很好,其半衰期对数值的均方差只有0.895.理论结果表明,有效液滴模型能充分反映N=126和Z=82的壳效应,并且在奇数结团25Ne,29Mg中出现了明显的奇偶质量摆动现象.另外,理论计算得到的结团半衰期基本符合盖革-努塔尔定律,并基于理论结果得到了一些关于盖革-努塔尔定律的有意义的结论. 相似文献
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