评“超新星中微子过程的138 La-138 Ce-136 Ce核宇宙计时器”
Comment on "138La-138Ce-136Ce nuclear cosmochronometer of the supernova neutrino process"
摘要：
Hayakawa等人[Phys.Rev.C77，065802（2008）]基于前太阳颗粒中的138 La-138 Ce-136 Ce丰度比提出的核chosmochronometer将受到138 La中存在迄今未知的低能1+态的影响。最近的一项高分辨率研究结果表明，138 Ba（3 He，t）反应在运动学下通过Gamow-Teller跃迁选择性地填充138 La中的1+态，这为反对这种假设状态的存在提供了强有力的证据。
英文摘要：
The nuclear chosmochronometer suggested by Hayakawa et al. [Phys. Rev.C 77, 065802 (2008)] based on the 138La-138Ce-136Ce abundance ratio in presolar grains would be affected by the existence of a hitherto unknown low-energy 1+ state in 138La. Results of a recent high-resolution study of the 138Ba(3He,t) reaction under kinematics selectively populating 1+ states in 138La through Gamow-Teller transitions provides strong evidence against the existence of such a hypothetical state.
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