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Examination of α-decay half-lives of undetected transfermium isotopes
International Journal of Modern Physics E ( IF 1.0 ) Pub Date : 2020-10-17 , DOI: 10.1142/s0218301320500858
Nguyen Nhu Le 1 , Nguyen Ngoc Duy 2, 3
Affiliation  

This study reports the [Formula: see text]-decay half-lives of 39 transfermium isotopes with [Formula: see text], most of which have not been observed. The half-lives were calculated using micro–macroscopic approaches and semi-empirical formulae, applying current [Formula: see text]-decay Q-values from the latest mass database, AME2016. These results were compared to predicted values in previous works to evaluate the efficiency of and difference between various calculation methods. We found that the [Formula: see text]-resonance approach used in a previous study is not appropriate to predict though most other approaches are mutually consistent. An uncertainty of 70% was observed in the present theoretical calculations, similar to that observed in measurements. A Q-value uncertainty of 10% can lead to a large variation of 3 orders of magnitude in predicted [Formula: see text]-decay half-life. We also found that the dominance of either [Formula: see text] decay or spontaneous fission is unclear for the isotopes with [Formula: see text]–[Formula: see text], whereas most of the nuclei of [Formula: see text]–[Formula: see text] can be clearly identified as [Formula: see text] emitters. Finally, we provide the updated [Formula: see text]-decay half-lives for the isotopes of interest, including their uncertainties and corresponding decay modes.

中文翻译:

检查未检测到的转移同位素的 α 衰变半衰期

本研究用[公式:见文本]报告了[公式:见文本]-衰变半衰期 39 种转移同位素,其中大部分未被观察到。使用微观宏观方法和半经验公式计算半衰期,应用来自最新质量数据库 AME2016 的当前 [公式:见文本]-衰减 Q 值。将这些结果与之前工作中的预测值进行比较,以评估各种计算方法的效率和差异。我们发现,之前研究中使用的[公式:见文本]-共振方法不适合预测,尽管大多数其他方法是相互一致的。在目前的理论计算中观察到 70% 的不确定性,类似于在测量中观察到的。10% 的 Q 值不确定性会导致预测的 [公式:见文本]-衰变半衰期出现 3 个数量级的大变化。我们还发现[公式:见文]-[公式:见文]的同位素,[公式:见文]衰变或自发裂变的主导地位尚不清楚,而[公式:见文]的大部分原子核–[公式:见文本]可以清楚地识别为[公式:见文本]发射器。最后,我们为感兴趣的同位素提供了更新的 [公式:见正文]-衰变半衰期,包括它们的不确定性和相应的衰变模式。see text] 可以清楚地识别为 [Formula: see text] 发射器。最后,我们为感兴趣的同位素提供了更新的 [公式:见正文]-衰变半衰期,包括它们的不确定性和相应的衰变模式。see text] 可以清楚地识别为 [Formula: see text] 发射器。最后,我们为感兴趣的同位素提供了更新的 [公式:见正文]-衰变半衰期,包括它们的不确定性和相应的衰变模式。
更新日期:2020-10-17
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