~（26）S的寿命及其2 p衰变能的极限
Lifetime of 26S and a limit for its 2p decay energy
摘要：
未知的同位素26 S，预计通过双质子（2 p）发射衰变，在理论上进行了研究，并在实验上进行了搜索。在相对论平均场（RMF）方法中检查了该核的结构。提出了一种在三体衰变计算中考虑多体结构的方法。RMF计算的结果被用来作为三集团衰变模型的输入，以研究该核可能的2 p衰变分支。在50.3A MeV ~（32）S束流的碎裂反应中进行了~（26）S的实验研究。没有观察到26 S或25 P（推测为26 S的质子不稳定子系统）的事件。根据获得的生产系统学，26 S的半衰期上限为T_{1/2} <79 ns was established from the time-of-flight through the fragment separator. Together with the theoretical lifetime estimates for two-proton decay this gives a decay energy limit of Q_{2p} >640 keV。发现25 P的类似限值为T_{1/2} <38 ns and Q_{p} >110 keV。在单质子发射是26 S衰变的主要分支的情况下，该核的极限Q_{2p} >230 keV。26 S可能存在于皮秒寿命范围内，对这种同位素的进一步研究有望用于飞行衰变技术。
英文摘要：
Unknown isotope 26S, expected to decay by two-proton (2p) emission, was studied theoretically and was searched experimentally. The structure of this nucleus was examined within the relativistic mean field (RMF) approach. A method for taking into account the many-body structure in the three-body decay calculations was developed. The results of the RMF calculations were used as an input for the three-cluster decay model worked out to study a possible 2p decay branch of this nucleus. The experimental search for 26S was performed in fragmentation reactions of a 50.3 A MeV 32S beam. No events of 26S or 25P (a presumably proton-unstable subsystem of 26S) were observed. Based on the obtained production systematics an upper half-life limit of T_{1/2}<79 ns was established from the time-of-flight through the fragment separator. Together with the theoretical lifetime estimates for two-proton decay this gives a decay energy limit of Q_{2p}>640 keV for 26S. Analogous limits for 25P are found as T_{1/2}<38 ns and Q_{p}>110 keV. In the case that the one-proton emission is the main branch of the 26S decay a limit Q_{2p}>230 keV would follow for this nucleus. It is likely that 26S resides in the picosecond lifetime range and the further search for this isotope is prospective for the decay-in-flight technique.
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