Alpha-decay -使用配备MRTOF-MS系统的$α$ - TOF检测器进行206，207 Ra的相关质量测量
Alpha-decay-correlated mass measurement of 206,207Ra using an $α$-TOF detector equipped MRTOF-MS system
摘要：
同位素$^{206,207}$ Ra的原子质量已经通过衰变相关质谱法使用配备有$α$ -TOF检测器的多反射飞行时间质谱仪测量。Ra同位素是在$^{51}$ V+ $^{159}$ Tb反应系统中作为聚变蒸发产物产生的，并由RIKEN的充气反冲离子分离器GARIS-II输送。$α$ -TOF检测器通过将飞行时间信号与随后的$α$ -衰变事件相关联来提供高精度质量测量。使用配备有$α$-TOF检测器的多反射飞行时间质谱仪直接测量$^{206}$ Ra和$^{207g,m}$ Ra的质量。测得质量过剩ME = 3538（15）keV/cPDMATHABMS，激发能E $_{\rm ex}$ = 552（42）keV。从衰变相关的飞行时间信号直接确定$^{207m}$ Ra的$α$ -衰变分支比，b $α$ = 0.26（20），并且从分支比计算出$^{207m}$ Ra的约化α宽度为$δ^2$ = 50+62-41 keV。根据衰变相关质量测量结果，证实了$^{207m}$ Ra的自旋宇称为$J^π$ = 13/2 $^-$。
英文摘要：
The atomic masses of the isotopes $^{206,207}$Ra have been measured via decay-correlated mass spectroscopy using a multi-reflection time-of-flight mass spectrograph equipped with an $α$-TOF detector. The Ra isotopes were produced as fusion-evaporation products in the $^{51}$V+$^{159}$Tb reaction system and delivered by the gas-filled recoil ion separator GARIS-II at RIKEN. The $α$-TOF detector provides for high-accuracy mass measurements by correlating time-of-flight signals with subsequent $α$-decay events. The masses of $^{206}$Ra and $^{207g,m}$Ra were directly measured using a multi-reflection time-of-flight mass spectrograph equipped with an $α$-TOF detector. A mass excess of ME = 3538(15) keV/c$^2$ and an excitation energy of E$_{\rm ex}$ = 552(42) keV were determined. The $α$-decay branching ratio of $^{207m}$Ra, b$α$ = 0.26(20), was directly determined from decay-correlated time-of-flight signals, and the reduced alpha width of $^{207m}$Ra was calculated to be $δ^2$ = 50+62-41 keV from the branching ratio. The spin-parity of $^{207m}$Ra was confirmed to be $J^π$ = 13/2$^-$ from decay correlated mass measurement results.
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