Alpha capture for astrophysics: Experiments in Dresden, Munich and Gran Sasso

新的天文数据为理解宇宙的起源和发展打开了一扇大门：微波观测开启了宇宙学的精密时代，基于卫星的7射线观测显示，我们的银河系正在进行核合成。作为对天文学突破的补充，需要在覆盖范围和核数据精度方面取得类似的突破。基于这些数据，大爆炸和超新星的模型可以通过比较它们的预测和观测来验证或证伪。本提案针对这一需要，集中于两个α俘获反应，在这两个反应中，尖端的地下低水平γ-射线能谱将提供必要的信息：超新星物理的40Ca(α，γ)44Ti反应将在德累斯顿和慕尼黑研究。44Ti样品应在费尔森凯勒地下设施中进行研究。大爆炸核合成的2C H(α，γ)6Li反应将在意大利露娜设施中用束内γ光谱进行研究。新的数据将使超新星和大爆炸核合成模型的新的、严格的测试成为可能。

New astronomical data have opened the door for great progress in understanding the origin and development of the universe: Microwave observations instigated a precision era of cosmology, and satellite-based 7-ray observations show nucleosynthesis at work in our galaxy. Complementing the breakthrough in astronomy, a similar breakthrough in reach and precision of nuclear data is called for. Based on this data, models of the big bang and of Supernovae can then be verified or falsified by comparing their predictions to observation. The present proposal addresses this need, concentrating on two α-capture reactions where cutting edge underground low level γ-ray spectrometry will provide the necessary information: The 40Ca(α,γ) 44Ti reaction for supernova physics shall be studied in Dresden and Munich. 44Ti samples shall be studied in the Felsenkeller underground facility. The ²H (α,γ) 6Li reaction for big-bang nucleosynthesis shall be studied by in-beam γ-spectrometry at the LUNA facility in Italy. The new data will make new, stringent tests possible for models for Supernovae and for big bang nucleosynthesis.