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大门：微波观测开启了宇宙学的精确时代，基于卫星的7射线观测显示核合成在我们的星系中起作用。除了天文学上的突破之外，还需要在核数据的覆盖范围和精确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将它们的预测与观测进行比较来验证或证伪。目前的建议满足了这一需求，集中在两个α捕获反应，其中尖端的地下低水平γ射线光谱测量将提供必要的信息：40 Ca（α，γ）44 Ti反应超新星物理学应在德累斯顿和慕尼黑进行研究。44Ti样品应在Felsenkeller地下设施中进行研究。将在意大利的LUNA设施用束内γ能谱法研究大爆炸核合成的²H（α，γ）6Li反应。新的数据将为超新星和大爆炸核合成模型提供新的，严格的测试。

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.