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首页> 外文期刊>Physical Review C: Nuclear Physics >Production of 265Sg in the 248Cm(22Ne,5n)265Sg reaction and decay properties of two isomeric states in 265Sg
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Production of 265Sg in the 248Cm(22Ne,5n)265Sg reaction and decay properties of two isomeric states in 265Sg

机译：248Cm（22Ne，5n）265Sg反应中265Sg的产生以及265Sg中两个异构态的衰变特性

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Two isomeric states of 265Sg, i.e., 265Sga and 265Sgb, proposed in Ch. E. Düllmann and A. Türler [ Phys. Rev. C 77 064320 (2008)] were produced in the 248Cm(22Ne,5n)265Sg reaction. Decay properties of 265Sga,b were investigated with a rotating-wheel apparatus for α 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 α-α(-α) and α-SF decay chains, 18 and 24 events were assigned to 265Sga and 265Sgb, respectively. The half-life T1/2 and α-particle energy Eα of 265Sga were measured to be 8.5−1.6+2.6 s and 8.84 ± 0.05 MeV, respectively, and those of 265Sgb were 14.4−2.5+3.7 s and 8.69 ± 0.05 MeV. As a daughter product of 265Sga,b, the decay properties of the 3-s isomeric state in 261Rf, i.e., 261Rfb, were also derived: T1/2 = 2.6−0.5+0.7 s, Eα = 8.51 ± 0.06 MeV, and SF branch bSF = 0.82 ± 0.09. These results confirm and refine the decay pattern suggested for the decay chain 269Hs → 265Sga,b → 261Rfa,b → 257No → in Düllmann and Türler. The production cross sections for 265Sga and 265Sgb were determined to be 180−60+80 and 200−50+60 pb at 117.8 MeV, respectively, and they are discussed by comparing with the literature data as well as the theoretical prediction.
机译：在Ch。Chem。中，提出了265Sg的两种异构状态，即265Sga和265Sgb。 E.Düllmann和A.Türler[物理学Rev.C 77 064320（2008）]在248Cm（22Ne，5n）265Sg反应中产生。用旋转轮装置对265Sga，b的衰变特性进行了研究，并在低背景条件下通过与RIKEN充气反冲离子分离器相连的气体喷射传输系统获得了自发裂变（SF）光谱。根据遗传相关的α-α（-α）和α-SF衰变链，分别将18和24个事件分配给265Sga和265Sgb。测得265Sga的半衰期T1 / 2和α粒子能量Eα分别为8.5-1.6 + 2.6 s和8.84±0.05 MeV，而265Sgb的半衰期T1 / 2和α-粒子能量Eα分别为14.4-2.5 + 3.7 s和8.69±0.05 MeV。作为265Sga，b的子产物，还推导了261Rf（即261Rfb）中3-s异构态的衰变特性：T1 / 2 = 2.6-0.5 + 0.7 s，Eα= 8.51±0.06 MeV，SF分支bSF = 0.82±0.09。这些结果证实并完善了在杜尔曼和蒂勒的269Hs→265Sga，b→261Rfa，b→257No→衰变链建议的衰变模式。 265Sga和265Sgb的生产截面在117.8 MeV时分别确定为180-60 + 80和200-50 + 60 pb，并与文献数据和理论预测进行了讨论。

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