大的前太阳碳化硅颗粒的He和Ne年龄：解决反冲问题
He and Ne ages of large presolar silicon carbide grains: Solving the recoil problem
摘要：
关于太阳前颗粒年龄的知识，为我们了解银河系的化学演化和颗粒形成与破坏过程的动力学提供了重要的见解。从宇宙射线相互作用产物的丰度确定是简单的，但在过去遭受了不确定性校正反冲损失的spectrometric产品。这个问题在一类大颗粒（几十微米）中不太严重。我们描述的校正程序和总结结果的He和Ne年龄的前太阳SiC的“巨无霸”颗粒，范围从接近零到~850百万年，与大多数小于200百万年。我们还讨论了将我们的方法扩展到大多数较小的SiC晶粒的可能性，并探讨了捕获宇宙射线的可能贡献。
英文摘要：
Knowledge about the age of presolar grains provides important insights into Galactic chemical evolution and the dynamics of grain formation and destruction processes in the Galaxy. Determination from the abundance of cosmic ray interaction products is straightforward, but in the past has suffered from uncertainties in correcting for recoil losses of spallation products. The problem is less serious in a class of large (tens of micrometer) grains. We describe the correction procedure and summarise results for He and Ne ages of presolar SiC "Jumbo" grains that range from close to zero to ~850 Myr, with the majority being less than 200 Myr. We also discuss the possibility of extending our approach to the majority of smaller SiC grains and explore possible contributions from trapping of cosmic rays.
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