Production of 262Db in the 248Cm(19F,5n)262Db reaction and decay properties of 262Db and 258Lr
Production of 262Db in the 248Cm(19F,5n)262Db reaction and decay properties of 262Db and 258Lr
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DOI：
10.1103/physrevc.89.024618
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发表时间：
2014-02-28
影响因子：
3.1
通讯作者：
Tsukada, K.
中科院分区：
文献类型：
--
作者：
Haba, H.;Huang, M.;Tsukada, K.
在束流能量为103.1和97.4 MeV的Cm-248（F-19，5 n）（262）Db反应中产生了核素（262）Db。利用RIKEN充气反冲离子分离器和气体喷射输运系统，在低本底条件下，用转轮α和自发裂变（SF）谱仪研究了（262）Db的衰变特性。基于遗传相关的α-α和α-SF衰变链，共76条链被分配给（262）Db及其α-衰变子体核素Lr-258。在Cm-248（F-19，4 n）（263）Db反应中产生的（263）Db及其子体Lr-259中没有观察到相关的衰变链。测得（262）Db和Lr-258的半衰期分别为T-1/2 = 33.8（-3.5）（+4.4）和3.54（-0.36）（+0.46）s，证实了文献数据。（262）Db的α粒子能量（E-alpha）和强度（I-alpha）被修正为E-alpha = 8.46+/-0.04 MeV（I-alpha = 70+/-5%）和E-alpha = 8.68+/-0.03 MeV（I-alpha = 30+/-5%）。T-1/2 = 30.2+/-6.1 s的SF活性被指定为（262）Db，并且（262）D B的SF分支被确定为B（SF）= 52+/-4%。根据对与（262）D B α衰变相关的两个SF衰变的观察，在Lr-258中提出了B（EC）= 2.6+/-1.8%的电子捕获（EC）衰变。Cm-248（F-19，5 n）（262）Db反应的产生截面在103.1 MeV时为2.1+/-0.7 nb，在97.4 MeV时为0.23（-0.11）（+0.18）nb，而Cm-248（F-19，4 n）（263）Db反应的产生截面是103.1 MeV时的上限。
The nuclide (262)Db was produced in the Cm-248(F-19,5n)(262)Db reaction at beam energies of 103.1 and 97.4 MeV. Decay properties of (262)Db were investigated with a rotating wheel apparatus for alpha and spontaneous fission (SF) spectrometry under low background conditions attained by a gas-jet transport system coupled to the RIKEN gas-filled recoil ion separator. Based on genetically correlated alpha-alpha and alpha-SF decay chains, a total of 76 chains were assigned to (262)Db and its alpha-decay daughter nuclide Lr-258. No correlated decay chain was observed for (263)Db produced in the Cm-248(F-19,4n)(263)Db reaction and its daughter Lr-259. The half-lives of (262)Db and Lr-258 were measured to be T-1/2 = 33.8(-3.5)(+4.4) and 3.54(-0.36)(+0.46)s, respectively, and they confirmed the literature data. The alpha-particle energy (E-alpha) and intensity (I-alpha) of (262)Db were revised to E-alpha = 8.46+/-0.04 MeV (I-alpha = 70+/-5%) and E-alpha = 8.68+/-0.03 MeV (I-alpha = 30+/-5%). The SF activity with T-1/2 = 30.2+/-6.1 s was assigned to (262)Db, and the SF branch of (262)Db was determined to be b(SF) = 52+/-4%. From an observation of two SF decays which correlated to the alpha decay of (262)Db, an electron capture (EC) decay with b(EC) = 2.6+/-1.8% was suggested in Lr-258. The production cross sections for the Cm-248(F-19,5n)(262)Db reaction were determined to be 2.1+/-0.7 nb at 103.1 MeV and 0.23(-0.11)(+0.18) nb at 97.4 MeV, whereas, those for the Cm-248(F-19,4n)(263)Db reaction were the upper limits of