论文标题
搜索自然存在的osmium核素的α衰变，并伴有伽马量子
Search for alpha decay of naturally occurring osmium nuclides accompanied by gamma quanta
论文作者
论文摘要
通过使用超低回光的宽阔的葡萄园$γ$γ$γ$ -DeTector，搜索自然发生的osmium同位素的$α$衰减，达到了最低的女儿核，搜索量为112 cm $^3 $^3 $，超纯净的oSmium样品的体积为118 g，在Gran Sasss sassso实验室（IFFN）（IFFN）（IFFN）（IFFN）（IFFN）（IFFN）（IFFN）（iffn forn）。使用负热电离质谱法测量了oSmium样品的同位素组成。在使用$γ$ -DETECTOR的数据获取15851小时后，未检测到效果，并且$α$衰减的下限设置为$ \ lim t_ {1/2} \ sim 10^{15} {15} -10^{19} $ yr。 $α$衰变的限制为$^{184} $ OS和$^{186} $ os的女儿Nuclei的第一个兴奋级别，$ t_ {1/2}（^{184} $ os $） $ t_ {1/2}（^{186} $ os $）\ geq3.3 \ geq3.3 \ times10^{17} $ yr（在90％c.l.），超过了衰减半衰期的当前理论估计。对于$^{189} $ OS和$^{192} $ OS也会腐烂到子核的基态，因为女儿核素的不稳定相对于$β$衰减。
A search for $α$ decay of naturally occurring osmium isotopes to the lowest excited levels of daughter nuclei has been performed by using an ultra-low-background Broad-Energy Germanium $γ$-detector with a volume of 112 cm$^3$ and an ultra-pure osmium sample with a mass of 118 g at the Gran Sasso National Laboratory of the INFN (Italy). The isotopic composition of the osmium sample has been measured with high precision using Negative Thermal Ionisation Mass Spectrometry. After 15851 h of data taking with the $γ$-detector no effect has been detected, and lower limits on the $α$ decays were set at level of $\lim T_{1/2}\sim 10^{15}-10^{19}$ yr. The limits for the $α$ decays of $^{184}$Os and $^{186}$Os to the first excited levels of daughter nuclei, $T_{1/2}(^{184}$Os$)\geq 6.8\times10^{15}$ yr and $T_{1/2}(^{186}$Os$)\geq3.3\times10^{17}$ yr (at 90% C.L.), exceed the present theoretical estimates of the decays half-lives. For $^{189}$Os and $^{192}$Os also decays to the ground states of the daughter nuclei were searched for due to the instability of the daughter nuclides relative to $β$ decay.
