Nuclear Astrophysics at ISAC with DRAGON

大多数化学元素是通过一连串的核反应和放射性衰变在恒星中产生的，特定同位素的丰度取决于形成速度和破坏速度之间的竞争。Dragon设施测量辐射捕获反应的强度，这是发生氢气或氦爆炸燃烧的地点的关键步骤。我们最近测量了两个对破坏Al-26或形成Ti-44很重要的反应，这两个放射性核素的衰变已经在轨道伽马射线望远镜中被探测到。我们将继续测量核天体物理学中重要的俘获反应。感兴趣的恒星地点包括新星、X射线爆发和超新星，而恒星可观测到的包括核衰变产生的伽马射线和陨石颗粒中的同位素丰度。TRIUMF/ISAC的强辐射束和Dragon的高灵敏度相结合，是世界上任何其他设施都无法比拟的。

Most chemical elements have been produced in stars through a chain of nuclear reactions and radioactive decays, the abundance of a given isotope depending upon competition between rates of formation and destruction. The DRAGON facility measures strengths of radiative capture reactions which are key steps in sites where explosive burning of hydrogen or helium takes place. We recently have measured two reactions which are important in destruction of Al-26 or formation of Ti-44, two radionuclides whose decay has been detected in orbiting gamma-ray telescopes. We will continue to measure capture reactions of importance in nuclear astrophysics. Stellar sites of interest include novae, x-ray bursts and supernovae, while stellar observables include gamma rays from nuclear decay and isotopic abundances in meteorite grains. The combination of intense radioactive beams at TRIUMF/ISAC and high sensitivity of DRAGON is unmatched by any other facility in the world.